1. PROCEDURAL HISTORY
    2. OVERVIEW OF THE TACO PROCESS
    3. SUMMARY OF THE SUBPARTS A THROUGH K
    4. Subpart A: Introduction
    5. Subpart B: General
    6. Subpart C: Exposure Route Evaluations
    7. Subpart D: Determining Area Background
    8. Subpart E: Tier 1 Evaluation
    9. Subpart F: Tier 2 General Evaluation
    10. Subpart G: Tier 2 Soil Evaluation
    11. Subpart H: Tier 2 Groundwater Evaluation
    12. Subpart I: Tier 3 Evaluation
    13. Subpart J: Institutional Controls
    14. Subpart K: Engineered Barriers
    15. SUMMARY
    16. ORDER
    17. Section 742.APPENDIX A: General
    18. Section 742.APPENDIX A: General
    19. Section 742.APPENDIX A: General
    20. Section 742.APPENDIX A: General
    21. Section 742.TABLE B: Tolerance Factor (K)
    22. Section 742.APPENDIX A: General
    23. Section 742.TABLE C: Coefficients {AN-I+1} for W Test of Normality, for N=2(1)50
    24. Section 742.APPENDIX A: General
    25. Section 742.TABLE D: Percentage Points of the W Test for N=3(1)50
      1. Section 742.APPENDIX A: General
      2. Section 742.APPENDIX A: General
    26. Section 742.APPENDIX A: General
    27. Section 742.TABLE G: Concentrations of Inorganic Chemicals in Background Soils
    28. Section 742.APPENDIX B: Tier 1 Tables and Illustrations
    29. Section 742.Illustration A: Tier 1 Evaluation
    30. Section 742.APPENDIX B: Tier 1 Tables and Illustrations
    31. Section 742.APPENDIX B: Tier 1 Tables and Illustrations
    32. Section 742.APPENDIX B: Tier 1 Tables and Illustrations
    33. Section 742.APPENDIX B
    34. Section 742.APPENDIX B: Tier 1 Tables and Illustrations
      1. Section 742.APPENDIX B: Tier 1 Tables and Illustrations
    35. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    36. Section 742.Illustration A: Tier 2 Evaluation for Soil
    37. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    38. Section 742.Illustration B: Tier 2 Evaluation for Groundwater
    39. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    40. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    41. Section 742.Table A: SSL Equations
    42. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    43. Section 742.Table B:  SSL Parameters
    44. Section 742.Appendix C: Tier 2 Tables and Illustrations
    45. Section 742.Table C: RBCA Equations
    46. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    47. Section 742.Table D: RBCA Parameters
    48. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    49. Section 742.Table E:  Default Physical and Chemical Parameters
    50. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    51. Section 742.Table F:  Methods for Determining Physical Soil Parameters
    52. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    53. Section 742.Table G:  Error Function (erf)
    54. 742.APPENDIX C: Tier 2 Tables and Illustrations
    55. Section 742.Table H: Q/C Values by Source Area
    56. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    57. Section 742.APPENDIX C: Tier 2 Tables and Illustrations
    58. Section 742.APPENDIX C: Tier 2 Tables and Illustrations

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ILLINOIS REGISTER
 
POLLUTION CONTROL BOARD
 
NOTICE OF ADOPTED RULES
 

 
 
 
 
 
 
 
 
 
 
 

 

 
 
 

 

 
 
 

 

 
 
 

 

 
 
 

 

 
 
 

 

 
 
 

 

 
 
 

 

 
 
 
 
 
 
 
 
 
 
 

 

 
 
 

 

 
 
 
 
 
 
 

 

 
 
 

 

 
 
 

 

 
 
 

 

 
 
 

 

 
 
 

 

 
 
 

 

 
 
 
 
 
 
 

 

 
 
 
 
 
 

ILLINOIS POLLUTION CONTROL BOARD
June 5, 1997

 
IN THE MATTER OF:
 
TIERED APPROACH TO CORRECTIVE ACTION OBJECTIVES (TACO): 35 ILL. ADM. CODE PART 742 		)
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R97-12 (A)
(Rulemaking - Land)
     

Adopted Rule. Final Order.
 
OPINION AND ORDER OF THE BOARD (by M. McFawn and J. Yi):
 
The Board adopts today as final, rules which create a tiered approach to establishing corrective action, i.e., remediation objectives, based on risks to human health and the environment, allowing consideration of the proposed land use at a subject site. These rules are located at a new part, 35 Ill. Adm. Code 742, entitled the Tiered Approach to Corrective Action Objectives, and have therefore become known as the TACO rules. Part 742 is unusual because it does not regulate activities at a site or mandate fixed clean up standards. Rather, the TACO rules at Part 742 provide the acceptable methodologies for determining site-specific, risk-based remediation objectives; while the programs to which TACO is applied govern the scope and extent of the site investigation preceding the application of TACO, as well as the no further remediation determination made by the Illinois Environmental Protection Agency (Agency) after the TACO derived remediation objectives are achieved. The TACO rules are to be applied to all types of remediation programs under the Illinois Environmental Protection Act (Act) (415 ILCS 5/1 et seq. (1994)), including the Site Remediation Program adopted today as a new Part 740, and the Underground Storage Tank rules found at Part 732 and the Resource Conservation and Recovery Act programs.
 
The TACO methodology is premised upon the statutory mandates in the Site Remediation legislation, P.A. 89-431, which was signed and became effective December 15, 1995, and later amended by P.A. 89-443, effective July 1, 1996. The Site Remediation legislation, also known as the Brownfield legislation, added Title XVII to the Act. Title XVII is intended to achieve five objectives. Those objectives are to: 1) establish a risk-based system of remediation based on the protection of human health and the environment relative to present and future use of the land; 2) assure that the land use for which remedial action was undertaken will not be modified without consideration of the adequacy of such remedial action for the new land use; 3) provide incentives for the private sector to undertake remedial action; 4) establish expeditious alternatives for the review of site investigation and remedial activities, including a privatized review process; and 5) assure that the resources of the Hazardous Waste Fund are used in a manner that is protective of human health and the environment relative to present and future uses of the site and surrounding area. The TACO rules address the first two of these objectives; the remaining three are the focus of the Site Remediation Program at Part 740.
 



PROCEDURAL HISTORY

 
On September 16, 1996 the Agency filed a proposal to add the TACO rules as a new Part 742 to the Board’s rules. The Board accepted this matter for hearing on September 19, 1996. On November 7, 1996, the Board sent this matter to First Notice without commenting on the merits of the proposal. Subsequently, on December 6, 1996, the proposal was published in the Illinois Register (20 Ill. Reg. 15429.)
 
Development of the Proposal. Section 58.11 of the Act, adopted as part of the Site Remediation Program legislation, created the Site Remediation Advisory Committee (SRAC) to advise the Agency in developing the mandated TACO and the Site Remediation Program regulatory proposals. The SRAC consists of one member from each of the following organizations: the Illinois State Chamber of Commerce, the Illinois Manufacturers Association, the Chemical Industry Council of Illinois, the Consulting Engineers Council of Illinois, the Illinois Bankers Association, the Community Bankers Association of Illinois, and the National Solid Waste Management Association. In addition, representatives from the Illinois Petroleum Council, the Illinois Petroleum Marketers Association, and the City of Chicago participated. The Agency met with the SRAC, or subgroups thereof, ten times between March 14, 1996 and August 30, 1996, to discuss both the TACO rules and the rules for the Part 740 Site Remediation Program. The TACO rules proposed by the Agency and adopted for First Notice represented the consensus reached by the SRAC and the Agency on the TACO rules. (See Exh. 1 at 11.) Two sets of hearings were held in this matter during the First Notice period. The first set of hearings, held on December 2 and 3, 1996, in Chicago, and on December 10, 1996 in Springfield, was reserved for the Agency’s presentation of its proposal and questions for Agency witnesses. The second set of hearings, held on January 15 and 16, 1997 in Springfield, was for the purpose of addressing remaining questions for the Agency, allowing the presentation of testimony by other interested participants, and allowing questions directed to those testifying.
 
Subsequent to those hearings and after the close of the public comment period, on April 17, 1997, the Board sent the proposal to Second Notice, pursuant to the Administrative Procedure Act (5 ILCS 100/1-1 et seq. (1994)), for consideration by the Joint Committee on Administrative Rules. The Board opinion accompanying the second notice order explains in detail how the TACO methodology was developed and how the rules are to be applied in conjunction with other Board rules governing site remediation. At that time the Board also bifurcated this rulemaking and adopted a separate opinion and order creating a Docket B, wherein the Board proposed for First Notice new rules concerning a single issue. The Board found it necessary to do so because the Agency had requested that the Board adopt a “mixture” rule, i.e., a rule which requires that an applicant consider the cumulative effect of similar-acting contaminants at a site when developing the appropriate remediation objectives. Shortly thereafter, the Secretary of State informed the Board that it would not accept Docket B for First Notice publication because the rules proposed therein were amendments to Part 742 which was not yet adopted as final. Consequently, on May 1, 1997, the Board vacated its April 17, 1997 opinion and order, and replaced it with an opinion and order adopting the mixture rule under Docket B as proposed rules only.
 
On May 20, 1997, the Joint Committee on Administrative Rules voted no objection to the new Part 742, as proposed under Docket A. Today, the Board adopts Part 742 as final rules to become effective on July 1, 1997. The July 1, 1997 effective date coincides with the effective dates of the Site Remediation Program rules also finalized today as a new Part 740: In the Matter of: Site Remediation Program and Groundwater Quality, docketed as R97-11; and In the Matter of : Leaking Underground Storage Tanks, docketed as R97-10, adopted by the Board on March 6, 1997 amending the existing Part 732 which govern remediation of underground storage tanks. (Like the TACO rules, the Site Remediation Program was mandated by P.A. 89-431, while the leaking underground storage tank amendments were mandated by P.A. 89-457, effective May 22, 1996.)
 
 Docket B: For the most part, the Agency’s request for a mixture rule was developed in a series of filings subsequent to the public hearings in this matter, and with minimum justification in support of such rules. In its initial rulemaking proposal, the Agency had only requested a mixture rule under Tier 2 for noncarcinogenic chemicals. In its filings during the public comment period, but after the close of hearings, the Agency requested that the Board also adopt a mixture rule applicable to the development of groundwater remediation objectives under Tier 1 for both carcinogenic and noncarcinogenic chemicals, and further requested that the Tier 2 rule be applicable to carcinogenic chemicals in groundwater. The record before the Board at the time of Second Notice was insufficient for the Board to adopt the entire mixture rule ultimately requested by the Agency. However, the justification provided in support of expanding the rule’s applicability did indicate that absent such a rule, remediation objectives determined using TACO may not be protective of human health at sites with multiple, similar-acting chemicals. Therefore, the Board found it necessary to clearly examine the mixture rule proposed by the Agency to determine to what extent it is necessary to insure that the remediation objectives developed under TACO are protective of human health in all circumstances. Docket B was opened for that purpose. Docket B will proceed through regular rulemaking, albeit on an expedited schedule.

 



OVERVIEW OF THE TACO PROCESS

 
 The TACO rules establish procedures for developing remediation objectives for soil and groundwater at remediation sites based on risks to human health, taking into account the existing pathways for human exposure and current and future use of the remediation site. The methodology consists of a three tiered approach for establishing remediation objectives. The tiers can operate fully independent of each other, and it is not necessary to perform a Tier 1 analysis before performing a Tier 2 or Tier 3 analysis, or to perform a Tier 2 analysis before performing a Tier 3 analysis. Each successive tier allows the person conducting a remedial investigation pursuant to the Act (hereinafter referred to as the “applicant”) to rely on more site-specific information, and requires a concomitant increase in the level of site-specific investigation and analysis under Part 742.
 
 As a prerequisite to using the tiered approach to establish remediation objectives, the applicant must determine the contaminants of concern at the site. This is done by conducting a site investigation under the applicable remediation program; such investigation is not part of the TACO process. Again, the programs with which TACO is to be used include the Underground Storage Tank program at Part 732, the Site Remediation Program proposed at Part 740, and the RCRA Part B Permits and Closure Plans at Parts 724 and 725. As mentioned at the outset, these programs govern the activities at the site which address the contamination, including the scope of the site investigation and ultimately the no further remediation determination made by the Agency. (Hereinafter in the opinion, these programs are referred to as the “governing programs.”) The specific requirements of the governing program control how TACO is applied to determine the applicable remediation objective.
After identifying the contaminants of concern, the applicant can use the TACO process to establish remediation objectives. Each tier of the TACO process requires the applicant to consider up to four potential exposure routes for each contaminant of concern: 1) the inhalation exposure route; 2) the soil ingestion route; 3) the dermal contact exposure route 1 ; and 4) the groundwater ingestion route. The groundwater ingestion route is further subdivided into two components: 1) the migration to groundwater, or soil component, which must be investigated to establish a soil remediation objective; and 2) the direct ingestion of groundwater, or groundwater component, which must be investigated to establish a groundwater remediation objective. (Hereinafter each component of the groundwater ingestion route is referred to as the “soil component” or the “groundwater component”). Alternatively, as described in greater detail below, the applicant can: 1) demonstrate that a particular exposure route is not available for a contaminant of concern, and thereby exclude further consideration of that exposure route for that contaminant, or 2) rely on area background concentrations in establishing remediation objectives or to demonstrate that further remediation is not warranted.
 
 A Tier 1 analysis requires the applicant to compare levels of contaminants of concern at the remediation site to pre-determined remediation objectives. The pre-determined remediation objectives are listed in the rules at Appendix B, Tables A through E. Separate remediation objectives are established for properties designated for residential use and for industrial/commercial use. The residential levels are the most stringent and are considered protective for all uses. The industrial/commercial levels are less stringent and must be accompanied by an institutional control, such as a deed restriction, in order to assure that the site is used only for industrial/commercial purposes. Additionally, if the site is to be remediated to industrial/commercial levels, the applicant must assure that the remediation levels established for construction workers are also achieved. If any contaminants of concern at a remediation site are found to exceed the applicable pre-determined levels, the applicant is required to remediate the contamination until the remediation objectives are achieved, or alternatively, to develop site-specific remediation objectives using a Tier 2 or Tier 3 analysis. Under Tier 1, if multiple noncarcinogenic chemicals with similar-acting properties are present in the groundwater, their cumulative effect must be evaluated as part of the development of remediation objectives. This is the Tier 1 component of the mixture rule adopted pursuant to the Agency’s public comments during First Notice, and currently under further consideration under Docket B.
 
A Tier 2 analysis uses equations set forth in the rules to develop alternative remediation objectives for contaminants of concern using site-specific information. The equations used to develop site-specific remediation objectives are from the United States Environmental Protection Agency’s (USEPA) Soil Screening Levels Guidance (SSL) and the American Society of Testing and Material’s (ASTM) Risk Based Corrective Action (RBCA). The equations are set forth in the proposed rules at Appendix C, Tables A and C, respectively. If any contaminants of concern are found to exceed the remediation objectives developed using the Tier 2 equations, the applicant is required to remediate the contamination until the objectives are achieved or to develop alternative objectives using a Tier 3 analysis. The mixture rule for noncarcinogens is also applicable under Tier 2. Unlike a Tier 1 analysis, however, it is applicable when developing both soil and groundwater remediation objectives. This component of the Tier 2 mixture rule, as well as a mixture rule for carcinogens in groundwater, are bother under further consideration in Docket B.
 
 A Tier 3 analysis allows the applicant to develop remediation objectives using alternative parameters not found in Tier 1 or Tier 2. It allows the applicant great flexibility in developing remediation objectives appropriate for a particular site based upon site-specific information rather than relying on general categories of information. The options available under Tier 3 include: use of modified parameters in the Tier 2 equations; use of alternative models; conducting a site-specific risk assessment; assessment of impractical remediation; and variation of the target risk level. If any contaminants of concern are found to exceed the remediation objectives developed using the Tier 3 analysis, the applicant is required to remediate the contamination until the objectives are achieved. At this time, the mixture rule is not specifically applicable to a Tier 3 analysis. However, a mixture rule for carcinogens and noncarcinogens is under consideration for soil and groundwater remediation objectives in Docket B.
 
 Outside of the individual tiers of analysis, there are two alternative means for addressing the presence of contamination: exclusion of pathways and reliance on area background. The first option, exclusion of pathways, is based on the premise that an exposure pathway must exist for contamination to present a threat to human health. If it can be shown that a pathway does not exist for any contaminants of concern, the applicant need not address that exposure pathway for those contaminants. The methods for evaluating and excluding exposure routes are set forth at Subpart C. The second option, reliance on area background, is based on Section 58.5(b)(1) of the Act, which provides that applicants shall not be required to remediate contaminants of concern to levels that are less than area background levels. If it can be shown that a contaminant of concern is present at levels that do not exceed area background levels for the site, the applicant need not further address that contaminant. Under appropriate circumstances, the applicant can also use background levels as remediation objectives. The methods for determining area background concentrations are set forth in Subpart D.
 
 The applicant can use any combination of tiers if multiple contaminants of concern are present at a site. Remediation objectives established under any tier are considered equally health protective for a particular land use. Upon completion of remedial activities which achieve the established remediation objectives, the applicant is entitled to a no further remediation determination in accordance with the terms of the governing program. The TACO rules do not provide for the no further remediation determination; they provide only the process for determining site-specific remediation objectives based upon risk. The no further remediation determination is made at the conclusion of the process by the Agency pursuant to the governing program. For example, the Agency’s no further remediation determination in the Site Remediation Program is effected through a No Further Remediation Letter. The same instrument is used in the Underground Storage Tank Program.
 
 The following section contains a more detailed summary of the components of the rules. A detailed summary of the major issues raised concerning various components of the TACO rules, is set forth in the third section of the Second Notice opinion adopted on April 17, 1997. (See R97-12(A), Opinion and Order of April 17, 1997, beginning at page 33.)

 



SUMMARY OF THE SUBPARTS A THROUGH K

 



Subpart A: Introduction
 
 This subpart contains sections concerning intent and purpose, applicability, overview and key elements of the tiered approach, and the requirements for site characterization. Section 742.100, entitled “Intent and Purpose,” states that Part 742, the TACO process, contains the procedures for use in evaluating risks to human health posed by environmental conditions, and procedures for use in developing objectives for remediation which assure that risks are at acceptable levels. Furthermore, Section 742.100(b) states that the procedures are intended to provide adequate protection of human health and the environment based on risks to human health posed by environmental conditions while incorporating site-related information.
 
 Section 742.105 sets forth the situations in which the rules are intended to apply. The applicant may use the Part 742 procedures to the extent allowed by state and federal law. The procedures must be used in accordance with the requirements of the program pursuant to which the remediation is being conducted. Section 742.105 specifically references the Underground Storage Tank program, the proposed Site Remediation Program, and the RCRA Part B Permits and Closure Plans. The use of Part 742 is subject to the limitation that it cannot be used where there is an imminent and substantial endangerment to human health and the environment. Section 742.105 also makes clear that groundwater remediation objectives established pursuant to the TACO process can exceed the groundwater quality standards set forth at 35 Ill. Adm. Code Part 620. This exception is based upon a statutory provision; the record does not otherwise support such a rule. Section 58.5 of the Act authorizes the use of groundwater remediation objectives for contaminants of concern that are greater than the groundwater quality standards established by the Board at 35 Ill. Adm. Code 620 pursuant to the Illinois Groundwater Protection Act. (415 ILCS 55/1 et seq.) The Board has made clarifying changes to Section 742.105 to notify the applicant that remediation objectives greater than the Part 620 standards may be developed only under Tier 3. Under Docket B, the Board is considering whether such remediation objectives may also be determined under Tiers 1 and 2.
 
 The Agency also proposed a rule to the effect that a no further remediation determination constitutes prima facie evidence that the contaminants of concern addressed at a site do not cause or tend to cause water pollution pursuant to Section 12(a) of the Act, or create a water pollution hazard pursuant to Section 12(d) of the Act. Such a statement would be particularly critical at sites remediated to groundwater objectives greater than the State’s groundwater quality standards, because those groundwater quality standards were adopted as being the minimum levels protective of human health and the environment pursuant to the Illinois Groundwater Protection Act. (Id.) As explained above, Section 58.5 of the Act allows an applicant to propose, and the Agency to approve pursuant to Tier 3 of TACO, remediation objectives greater than the State’s groundwater quality standards. Therefore, once such a remediation objective is achieved, the Agency’s no further remediation determination in effect deems the levels of contamination remaining at the site as protective of human health. Yet, the programs used in conjunction with TACO govern the scope and extent of the legal protection provided by a No Further Remediation Letter or any other type of no further remediation determination made by the Agency. Therefore, the Board did not adopt under TACO the rule proposed by the Agency addressing the effect of a no further remediation determination.
 
 Section 742.110 contains an overview of the tiered approach, which is similar to the summary of the rules set forth above. We will not repeat that discussion here. The applicant is well advised to consult the illustrations in the Appendices for assistance in understanding the TACO process generally, and any particular provisions. The Illustrations provide road maps and “decision trees” which further clarify the TACO process. Generally, Illustrations A and B of Appendix A provide decision trees for developing soil and groundwater remediation objectives, respectively. Illustration A of Appendix B provides such a road map for Tier 1, and Illustrations A and B of Appendix C provides the same for Tier 2. However, none of the illustrations include the effect of the mixture rule adopted today, or being considered under Docket B.
 
 Section 742.115 addresses the “Key Elements of the Tiered Approach.” It sets forth the exposure routes that must be evaluated, the factors that must be considered in determining the remediation objectives for contaminants of concern, and the potential land use classifications for the site. Section 742.115(a) sets forth the potential exposure routes that must be addressed at a remediation site, specifically: inhalation, soil ingestion, groundwater ingestion, and dermal contact with soil. The groundwater ingestion route is further divided into two components: the soil component and the groundwater component. The dermal contact exposure route need only be addressed if the applicant develops remediation objectives using RBCA equations set forth in Appendix C, Table C, or through a formal risk assessment under Tier 3. For each contaminant of concern, the applicant must develop remediation objectives for each applicable exposure pathway or demonstrate that a pathway has been excluded from consideration.
 
 Section 742.115(b) sets forth the factors that must be considered when identifying the contaminants of concern at the remediation site. These factors include: 1) the materials and wastes managed at the site; 2) the extent of the no further remediation determination which the applicant is seeking from the Agency under the governing program, e.g., under the Site Remediation Program, a comprehensive or focused No Further Remediation Letter; and 3) the general requirements applicable under the governing program. In the Site Remediation Program or a Section 4(y) voluntary cleanup, the applicant determines the scope of the remediation and the contaminants of concern that will be addressed. In other programs, the scope of the remediation and contaminants of concern will be dictated by the governing program’s requirements. At the conclusion of the process, the Agency will make a determination about whether further remediation is necessary under the governing program. If the Agency determines that no further remediation is necessary, the scope of the determination will extend only to the scope of the remediation performed.
 
 Section 742.115(c) sets forth the possible land use classifications under the TACO process. The rules allow the proposed land use to be characterized as one of the following: residential, conservation, agricultural, or industrial/commercial. The land use classification determines the expected exposure scenario at the site, which is a principal factor in establishing health protective remediation objectives.
 
 Tier 1 sets forth separate remediation objectives for residential and industrial/commercial uses. Similarly, Tier 2 has separate equations for developing remediation objectives for residential and industrial/commercial uses which reflect the different exposure rates expected for each land use. The remediation objectives for industrial/commercial property are premised upon a lower exposure rate, and therefore are less stringent than those established for residential property. Accordingly, an industrial/commercial designation under any tier requires an accompanying institutional control to assure that the land use is appropriately restricted to that property classification. Furthermore, because the rules do not reflect consideration of the appropriate exposure expected for a conservation or agricultural land use designation, these designations require a Tier 3 demonstration based on individual site use characteristics to assure appropriate protection of human health and the environment.
 
 Section 742.120 sets forth the requirement that the applicant perform a site characterization prior to developing remediation objectives pursuant to TACO in order to establish the extent and concentrations of contamination at the site. The site investigation must be conducted in accordance with the requirements of the governing program. The TACO rules therefore do not set forth a separate site investigation procedure.
 



Subpart B: General
 
 Subpart B of the rules contains general sections including definitions, a severability clause, and incorporations by reference. Additionally, Subpart B sets forth procedures for determining the soil attenuation capacity, the soil saturation limit, and demonstrating compliance with remediation objectives. These procedures apply across the entire TACO process. Finally, Subpart B contains the general rule that submittals to the Agency and subsequent review and approval by the Agency are to be done in accordance with the governing program’s rules.
 
 Definitions. Section 742.200 sets forth the definitions of terms used in these proposed rules. Most of these are self-explanatory, however several warrant further discussion.
The definition of the term “carcinogen” repeats the statutory language from Section 58.2 of the Act. This definition requires that contaminants that fall into any of the following categories be considered carcinogens: 1) Category A1 or A2 carcinogens, as defined by the American Conference of Governmental Industrial Hygienists; 2) Category 1 or 2A/2B carcinogens, as defined by the World Health Organization’s International Agency for Research on Cancer; 3) a “Human Carcinogen” or “Anticipated Human Carcinogen,” as defined by the United States Department of Health and Human Service National Toxicological Program; or 4) a Category A or B1/B2 carcinogen as defined by the United States Environmental Protection Agency in its Integrated Risk Information System (IRIS), or a final rule issued in a Federal Register notice by the USEPA. Because the USEPA Soil Screening Level Guidance, which the Agency relied upon in developing the Tier 1 Tables for soil remediation objectives, includes Category C carcinogens within its definition of “carcinogens,” the Agency recalculated the soil remediation objectives for those contaminants classified as Category C carcinogens by USEPA. The Board agrees that this properly reflects the statutory intent.
 
 At the Board’s request, the Illinois Department of Transportation (IDOT) introduced into the record the definitions of the terms “highway,” “highway authority,” and “right of way” from the Illinois Highway Code. (See Dec. 10, 1996 Transcript at 114 - 115.) The Agency proposed that these definitions be included in the proposed rules in its Errata Sheet No. 2. The Board believes that including these definitions in the rules clarifies these terms and ensures consistency in their application and, therefore, adopts these definitions.
 
 The definition of “residential property” proposed by the Agency paraphrased the statutory language for Section 58.2 of the Act. The Agency’s proposed definition reads:
“Residential Property” means any real property that is used for habitation by individuals or properties where children have the opportunity for exposure to contaminants through ingestion or inhalation at educational facilities, health care facilities, child care facilities or playgrounds. To more closely reflect the statutory intent, the Board adopts a slightly modified definition for Part 742, as well as in Part 740 in the R97-11 rulemaking. The definition as adopted reads:
 

“Residential Property” MEANS ANY REAL PROPERTY THAT IS USED FOR HABITATION BY INDIVIDUALS, or where children have the opportunity for exposure to contaminants through soil ingestion or inhalation at educational facilities, health care facilities, child care facilities, or outdoor recreational areas.

 
 Soil Attenuation Capacity and Saturation Limit. Section 742.215 requires that the concentrations of organic contaminants remaining in the soil not exceed the attenuation capacity of the soil and sets forth the method for determining soil attenuation capacity. The requirement that the soil attenuation capacity not be exceeded is intended to insure the integrity of the soil remediation objectives established under the tiered approach, since the models which are used to derive the soil remediation objectives do not account for the existence of free product. Contaminant transport models generally assume equilibrium between contaminants that adhere to soil particles and contaminants that dissolve in water in the soil pores. This assumption is violated if the soil attenuation capacity is exceeded; then the models cannot accurately predict the behavior and movement of contaminants. (See Exh. 4 at 3-5.) Furthermore, John Sherrill of the Agency testified that the requirement that the soil attenuation capacity not be exceeded will achieve three objectives. First, it will ensure that there will be no migration of mobile free products. Second, it will protect against potentially unacceptable health risks from accidental exposure to contamination left in place which might occur if an engineered barrier or institutional control is breached. Finally, it will provide a ceiling on the level of exposure from high contaminant concentrations from multiple organic contaminants. (Dec. 2, 1996 Transcript at 151-152.)
 
 Similarly, because the models which are used to derive the soil remediation objectives do not account for the existence of free product, Section 742.220 provides two circumstances under which remediation objectives cannot exceed the soil saturation limit (Csat). The soil saturation limit is defined in Section 742.200 as “the contaminant concentration at which soil pore air and pore water are saturated with the chemical and the adsorptive limits of the soil particles have been reached.” Pursuant to Section 742.220, the applicant must ensure that the soil saturation limit is not exceeded when establishing a Tier 2 or Tier 3 remediation objective for the inhalation exposure route for an organic contaminant with a melting point below 30o C, or when establishing a Tier 2 or Tier 3 remediation objective for the soil component of the groundwater ingestion exposure route for any organic contaminant.
 
 Section 742.220 establishes three methods for determining the soil saturation limit. These methods are: 1) use of the chemical-specific default values set forth in Appendix A, Table A; 2) use of a value derived from Equation S29 in Appendix C, Table A; or 3) use of a value derived from another method approved by the Agency.
 
 Compliance with Remediation Objectives. Section 742.225 sets forth the method for demonstrating compliance with remediation objectives. For groundwater remediation objectives, compliance with remediation objectives is demonstrated by comparing discrete samples to the applicable groundwater remediation objective. The location of groundwater sampling points is determined in accordance with the requirements of the governing program pursuant to which remediation is being conducted.
 
 Similarly, compliance with soil remediation objectives can be demonstrated by comparing discrete samples of contaminant concentrations to the applicable soil remediation objective, unless the applicant elects to composite or average soil samples in accordance with subsections (c) and (d) of this section, as explained below. Again, the number of locations is determined by the governing program.
 
 Subsection (c) of Section 742.225 sets forth the requirements and limitations applicable to compositing or averaging soil samples for the soil component of the groundwater ingestion exposure route. For contaminants other than volatile organic compounds (VOCs), discrete samples from the same boring may be composited or averaged. For VOCs, discrete samples from the same boring may be averaged but compositing of samples is not allowed. This is because compositing would tend to allow VOCs to volatilize and escape and the sampling would thus underestimate the presence of volatile contaminants of concern in the soil. A minimum of two sampling locations for every 0.5 acres of contaminated area is required, with discrete samples at each location taken at every two feet of depth, beginning six inches below the ground surface, and continuing through the zone of contamination. Samples may not be taken from below the water table.
 
 Subsection (d) of Section 742.225 sets forth the requirements and limitations applicable to compositing or averaging soil samples for the inhalation or ingestion exposure routes. The compositing and averaging requirements will be established on a site-specific basis, based upon a sampling protocol approved by the Agency.
 
 Pursuant to Section 742.225(e), for the purposes of calculating averages under Section 742.225, if no more than 50 percent of the samples are reported as non-detect or below detection limits, such results must be included in the sampling results as one-half of the reported detection limit for the contaminant. If more than 50 percent are reported as non-detect, the applicant must obtain Agency approval for an alternate procedure which is statistically valid for determining the average.
 
 Section 742.230 returns to the more general format of Subpart B. An omnibus provision, Section 742.230 addresses Agency review and approval of submittals. This section makes clear that the applicant must submit documents and requests in accordance with the governing program under which the remediation is being addressed and the Agency will review and approve the same in accordance with the governing program.
 
 



Subpart C: Exposure Route Evaluations
 
 Subpart C sets forth the requirements and methodologies for determining and evaluating the following exposure routes: inhalation, soil ingestion, and groundwater ingestion. The rules allow the applicant to exclude from consideration contaminants of concern for one or more exposure routes if the applicant demonstrates that the identified exposure route is not available for that contaminant. The principle underlying the pathway exclusion is different from that underlying the development of numeric remediation objectives. It is premised on the concept that an exposure route must exist which enables a contaminant to reach a receptor for the contaminant to present a threat to human health. Thus, Agency witness Mr. Gary King testified that pathway exclusion is based on effective source control, coupled with site conditions and an appropriate institutional control that effectively prohibits human exposure through a given pathway. (Exh. 2 at 4.) The rules set forth five general criteria, as well as exposure route-specific criteria, which must be satisfied to exclude an exposure route for a particular contaminant of concern.
 
 General Criteria for Exclusion of Pathways. There are five general criteria which must be satisfied before any exposure route may be excluded from consideration. These criteria are intended to insure that the contamination left in place when the pathway is excluded will not present a threat to human health. The first two criteria, set forth in Sections 742.305(a) and (b), require that the soil attenuation capacity and the soil saturation limit capacity not be exceeded, as set forth in Section 742.215 and 742.220, respectively. These criteria are intended to insure that there is no free product present and to insure that the behavior of the contaminants can be accurately modeled.
 
 Criteria three through five, set forth in Sections 742.305(c) through (e), require the applicant to insure that the contaminated soil which remains in place will not exhibit the hazardous characteristics of reactivity, corrosivity, or toxicity. Section 742.305(c) requires that any soil that contains contaminants of concern cannot exhibit any of the characteristics for reactivity for hazardous waste, as determined under 35 Ill. Adm. Code 721.123. Section 742.305(d) requires that any soil that contains contaminants of concern cannot exhibit a pH less than or equal to 2.0, or greater than or equal to 12.5. Finally, Section 742.305(e) requires that any soil that contains one or more of the inorganic chemicals arsenic, barium, cadmium, chromium, lead, mercury, selenium, silver, or the salts of any of these chemicals cannot exhibit characteristics of toxicity. The toxicity determination is made pursuant to the methods set forth at 35 Ill. Adm. Code 721.124.
 
 Specific Criteria for Exclusion of Pathways. Sections 742.310, 742.315 and 742.320 set forth the specific criteria which must be satisfied to exclude from consideration each particular pathway, i.e., inhalation, soil ingestion, and groundwater ingestion respectively. These criteria must be satisfied in order to exclude the applicable exposure route, in addition to the five general criteria set forth in Section 742.305.
 
 Section 742.310 sets forth additional criteria which must be satisfied in order to exclude the inhalation exposure route for contaminants of concern. In order to exclude this exposure route, the concentration of any contaminant of concern within ten feet of the land surface or any man-made pathway cannot exceed the Tier 1 remediation objective for the inhalation exposure route. Alternatively, the applicant can install an engineered barrier, as set forth in Subpart K, which is approved by the Agency. The applicant must also obtain an institutional control, in accordance with the requirements of Subpart J, which ensures compliance with these requirements and ensures the safety of construction workers.
 
 Section 742.315 sets forth additional criteria which must be satisfied in order to exclude the soil ingestion exposure route for contaminants of concern. To exclude this pathway, the applicant must demonstrate that the concentration of any contaminant of concern within three feet of the land surface does not exceed the applicable Tier 1 remediation objective or that an engineered barrier has been installed, in accordance with the requirements of Subpart K and approved by the Agency. Furthermore, the applicant must obtain an institutional control which ensures that these requirements are met and ensures the safety of construction workers.
 
Section 742.320 sets forth the additional criteria which must be satisfied in order to exclude the groundwater ingestion exposure route from consideration. These criteria include location and groundwater quality demonstrations, as well as a requirement that an institutional control, i.e. an ordinance adopted by the local government, be in place. Taken together, these criteria are intended to ensure that potable drinking water supplies will not be impacted by contamination left in place.
 
 Specifically, the applicant must demonstrate that corrective action measures have been completed to remove any free product. The applicant must also demonstrate that the source of the release is not located within the minimum or designated maximum setback zone or within a regulated recharge area of a potable water supply well. The applicant must also demonstrate that the concentration of any contaminant of concern in the groundwater within the minimum or designated maximum setback zone of an existing water supply well meets the applicable Tier 1 groundwater remediation objective. Finally, the applicant must demonstrate that the concentration of any contaminant of concern in groundwater which discharges to a surface water will meet the applicable surface water quality standards under 35 Ill. Adm. Code 302. These last two demonstrations must be made using Equation R26 in Appendix C, Table C. In order to exclude the direct ingestion of groundwater pathway, in addition to satisfying the location and groundwater quality demonstrations, the applicant must demonstrate, in accordance with Subpart J: Institutional Controls, that the unit of local government has adopted an ordinance that effectively prohibits the installation or use of groundwater as a potable supply of water. Such an ordinance must be in effect for any area within 2500 feet of the source of the release. Additionally, the unit of local government must enter into a Memorandum of Understanding (MOU) with the Agency if the local ordinance used as an institutional control does not prohibit the local government from installing and using a potable water supply well. The MOU must commit the local government to: 1) keep a registry of sites within its boundaries that have received no further remediation determinations; 2) consider whether groundwater contamination from those sites may be present at potential public well sites; and 3) take appropriate protective measures if wells are sited near such locations. (PC 15 at 5-6; Errata Sheet No. 2.)
 



Subpart D: Determining Area Background
 This subpart sets forth the procedures for determining area background concentrations for contaminants of concern. As set forth in Section 58.5(b) of the Act, applicants shall not be required to remediate contaminants of concern to levels that are less than area background levels, subject to two statutory exceptions which have been included in the rules at Section 742.415. First, if the contaminant concentration is equal to or less than the area background level, yet it exceeds the Tier 1 residential level, the property cannot be converted to residential use unless that remediation level or an alternative developed under Tier 2 or Tier 3 is achieved. (Section 58.5(b)(2) of the Act.) Second, if the Agency determines in writing that the area background level poses an acute threat to human health or the environment in consideration of the post-remedial land use, appropriate risk-based remediation levels must be developed. (Section 58.5(b)(3) of the Act.) If neither of these exceptions applies, and the applicant can demonstrate that contaminant concentrations are at area background levels, no further remediation is required. Another use of area background levels is for the applicant to demonstrate that area background levels should be used as the remediation objectives for contaminants of concern. This alternative is limited to industrial/commercial properties only, and accordingly requires the use of an institutional control.
 
 Determination of Area Background for Soils. Section 742.405 sets forth the method for determining area background for soils. Subsection (a) sets forth the sampling requirements. Section 742.405(b) sets forth the two options available to the applicant for determining the area background level for inorganics. The first option is referred to as the statewide area background approach. This approach relies upon data previously compiled by the Agency concerning area background concentrations throughout the State, which is set forth in Appendix A, Table G. Under the statewide area background approach, the applicant must set the upper limit of the area background concentration for the site at the value of the concentrations of inorganic chemicals in background soils listed in Appendix A, Table G. The applicant’s second option is to use another method which is statistically valid for the characteristics of the data set and which has been approved by the Agency.
 
 Determination of Area Background for Groundwater. Section 742.410 sets forth the method for determining area background concentrations for groundwater. Subsection (a) sets forth the sampling requirements and is intended to ensure that the sampling points are of sufficient quantity and appropriately located so as to be representative of actual background concentrations. Section 742.410(b) sets forth the two options available to the applicant for determining background levels for groundwater. The first option is referred to as the “Prescriptive Approach”; the second option is the use of another statistically valid approach which is appropriate for the data set and approved by the Agency.
 
 Under the Prescriptive Approach, the upper limit of the area background concentration for the site is set at the Upper Tolerance Limit (UTL) for sample sets of ten samples or more, or at the maximum value of the sample set for sets of less than ten samples. The Prescriptive Approach establishes the method for determining the UTL of a normally distributed sample. If the sample set contains less than fifty (50) samples, the applicant must use the Shapiro-Wilke Test of Normality to determine whether the sample set is normally distributed. The Prescriptive Approach can only be used if the samples are determined to be normally distributed.
 
 The Prescriptive Approach cannot be used if more than 15 percent of the groundwater sampling results for any chemical are less than the appropriate detection limit for that chemical. If 15 percent or less are less than the appropriate detection limit, a concentration equal to one-half the detection limit must be used for that chemical in the calculations. Additionally, the Prescriptive Approach cannot be used for determining area background for pH. For these exceptions and in any case, Section 742.410(b) concludes with the provision that another statistically valid approach may be used on a site-specific basis if approved by the Agency.
 
 Pursuant to Section 742.415, area background concentrations can be used in two ways. First, an area background concentration can be used to support a request to exclude a chemical as a contaminant of concern from further remediation due to its presence as a result of background conditions. Second, an area background concentration can be used as the remediation objective for a contaminant of concern. For either of these to occur the applicant must submit the request to the Agency. Again, however, pursuant to Section 58.5(b)(3) of the Act, area background cannot be used in either manner if the Agency determines, in writing, that the background level poses an acute threat to human health or the environment taking into consideration the post-remedial land use of the site.
 



Subpart E: Tier 1 Evaluation
 
 A Tier 1 evaluation compares the concentrations of contaminants of concern to established baseline remediation objectives which are set forth in Appendix B, Tables A through E. The Tier 1 objectives are numerical chemical concentrations that represent a level of contamination at or below which there are no human health concerns for the designated land use. The Tier 1 objectives for individual chemical contaminants do not exceed an excess cancer risk of 1 in 1,000,000 for carcinogens (also referred to as 1 x 10-6), or a hazard quotient 2 of 1 for noncarcinogens. The pre-established remediation objectives under Tier 1 are based upon the SSL and the screening levels therein are designed to insure that contaminants of concern individually will not present a greater risk. However, in some instances where multiple contaminants are present at a site, the cumulative effect of similar-acting chemicals may cause the target risk of 1 x 10-6 or the hazard quotient of 1 to be exceeded. To correct this, the rules adopted today include a mixture rule which provides that remediation objectives developed under Tier 1 for the groundwater ingestion exposure route must take into account the cumulative effect of noncarcinogens affecting the same target organs at a site. This rule, as well as a mixture rule for carcinogens in groundwater, are the subject of further consideration in Docket B.
 
 In order to allow consideration of the proposed land use for the site, different objectives are set forth for different receptor populations: residential, industrial/commercial, and construction workers. Where the remediation objectives are based on an industrial/commercial property use, institutional controls must be adopted in accordance with Subpart J to ensure that the land use is appropriately restricted. The applicant need not further evaluate an exposure route if all contaminants of concern are below Tier 1 values for that exposure route, with the one exception for groundwater remediation objectives.
 
 The Tier 1 remediation objectives are set forth in Appendix B, Tables A through E. These tables set forth remediation objectives for 117 chemicals. The tables are generally divided into two groups: those applicable to soil remediation objectives, and those applicable to groundwater remediation objectives. The groundwater component and the soil component of the groundwater ingestion route are further divided into objectives for Class I or Class II groundwater.
 
 Tier 1 Soil Remediation Objectives. Under Tier 1, the applicant must consider two different direct exposure routes for soil when establishing remediation objectives pursuant to the TACO approach: the inhalation exposure route and the ingestion exposure route. Additionally, the applicant must consider the soil component of the groundwater ingestion route. Because these objectives are considered sufficiently protective, the applicant need not examine the dermal contact exposure route under Tier 1. The Tier 1 soil remediation objectives are set forth in Appendix B, Tables A, B, C, and D. The mixture rule adopted today for similar-acting chemicals is not applicable to these remediation objectives.
 
 Appendix B, Table A sets forth the soil remediation objectives based upon residential property use, for the soil ingestion exposure route, the inhalation exposure route, and the soil component of the groundwater ingestion exposure route. Where appropriate, Table A also sets forth the Acceptable Detection Limit (ADL). 3 Because the Tier 1 residential levels are based upon protection in a residential exposure scenario, they are considered sufficiently protective that it is not necessary to establish separate remediation objectives for construction workers.
 
 Appendix B, Table B sets forth the Tier 1 soil remediation objectives based upon industrial/commercial property use. As for the residential remediation objectives in Table A, separate remediation objectives are established for the soil ingestion exposure route, the inhalation exposure route, and the soil component of the groundwater ingestion exposure route. For the soil ingestion exposure route and the inhalation exposure route, separate remediation objectives are established for two receptor populations: the industrial/commercial population and the construction worker population. For the soil component of the groundwater ingestion exposure route, separate remediation objectives are established for Class I and Class II groundwaters.
 
 The Tier 1 objectives for the soil ingestion and inhalation pathways were derived using the SSL with modifications as necessary to comply with Illinois law. The SSL was developed by USEPA for use in the Superfund program as a mechanism for screening out sites which do not require further study or action. The screening levels in the SSL are soil concentrations at or below which there is no concern in the Superfund program that some type of further action is required. They were developed based on a conceptual site model of a one-half acre site, with contamination extending to the water table, upon which a future residence with a private well would be built. (December 2, 1996 Transcript at pages 52-54; Exh. 5 at 11.)
 
 Again, the screening levels in the SSL are designed to insure that the contaminants of concern individually will not present a greater than 1 in a million excess cancer risk for carcinogens or have a hazard quotient greater than 1. Since the SSL is based on an anticipated residential use, the Tier 1 remediation objectives for the industrial/commercial and construction workers had to be calculated from the SSL equations using the different exposure assumptions appropriate for these populations.
 
 The Tier 1 objectives for the soil component of the groundwater ingestion route were derived from two different sources. For organic chemical contaminants, the Tier 1 objectives were derived using SSL equations with separate objectives established for Class I and Class II groundwaters. For inorganics, the proposed Tier 1 objectives establish two alternative approaches to setting soil objectives for the soil component of the groundwater ingestion route. The first alternative is based on the Toxicity Characteristic Leaching Procedure (TCLP) or the Synthetic Precipitation Leaching Procedure (SPLP) test. The second alternative is to allow pH-specific remediation objectives.
 
 Section 742.510(a)(4) allows the use of the SPLP or the TCLP to evaluate the soil component of the groundwater ingestion exposure route. The TCLP method is used in the Underground Storage Tank program; the SPLP method is new under the TACO rules. The latter has been adopted by the USEPA for determining compliance with remediation objectives. It is designed to mimic the pH of rainwater that percolates through a contaminated site. (January 15, 1997 Transcript and January 16, 1997 Transcript at pages 237-250; Exh. 18 at 7.)  Under either method, the remediation objective is the same as the Part 620 groundwater quality standard for the chemical of concern for the applicable groundwater classification. The applicant must perform a TCLP or SPLP analysis on a soil sample from the site and compare the concentration of the inorganic chemical of concern in the TCLP or the SPLP extract to the applicable groundwater standard. Additionally, an applicant still may evaluate the soil component on the basis of the total amount of contaminant in the soil sample result. This alternative is provided at subsection (a)(5) of Section 742.510.
 
 The second alternative for establishing soil objectives for the soil component of the groundwater ingestion appears at Section 742.510(a)(5) and allows the applicant to establish pH-specific remediation objectives appropriate for the conditions at the site. (Exh. 5 at 20.) In addition to inorganics, this alternative may be used to establish remediation objectives for certain ionizable organics. The pH-specific objectives for Class I and Class II groundwaters are set forth in Appendix B, Tables C and D, respectively. These alternative remediation objectives allow the applicant to elect to evaluate the soil component of the groundwater ingestion exposure route based on the total amount of contaminant in a soil sample result, rather than the TCLP or SPLP analysis. In order to use this alternative approach, the applicant must determine the soil pH at the site and then select the appropriate soil remediation objectives based on Class I and Class II groundwaters. This method cannot be used if the soil pH is less than 4.5 or greater than 8.0.
 
 Separate soil remediation objectives based on pH for identified ionizable organics or inorganics are adopted because the solubility of metals in water is highly dependent on pH of the solution. (See Section 742.505(a)(3)(C).) Generally, at lower pH, all metals are more soluble than at higher pH. To account for this phenomenon, the proposed standards have tables (Appendix B, Tables C and D) that list inorganic and ionizable organic compounds for pH values ranging from 4.5 to 8.0 in nine intervals of 0.25 increments. There are 15 metals and eight organic compounds listed in each table. There are separate tables for Class I and Class II groundwater.
 
 Finally, pursuant to Section 742.510(a)(6), the applicant must review the soil remediation objectives determined for each remaining exposure routes, and select the most stringent of those remediation objectives, and then compare that one to the soil concentrations measured at the site. When using Appendix B, Table B for evaluating industrial/commercial properties, the remediation objectives for the ingestion and inhalation exposure routes shall be the more stringent of the industrial/commercial populations and the construction worker populations. If the soil remediation objective for a chemical is less than the ADL, the ADL shall serve as the remediation objective. Based upon this analysis, the applicant will be able to identify the applicable soil remediation objective under a Tier 1 evaluation.
 
 Tier 1 Groundwater Remediation Objectives. Identifying the applicable groundwater remediation objective is more straightforward. Appendix B, Table E contains the groundwater remediation objectives for the groundwater component of the groundwater ingestion exposure route. The table contains separate values for Class I and Class II groundwaters and therefore the applicant must determine the Part 620 classification for groundwater at the site. The applicant must then compare the concentrations of groundwater contaminants at the site to the applicable Tier 1 groundwater remediation objectives set forth in Table E. Because this exposure route is based on direct ingestion of groundwater, an exposure route which is not impacted by the land use at the site, no distinction is made between residential and industrial/commercial use.
 
On an interim basis, the Board also adopts a requirement that the effect of similar-acting chemicals be evaluated when determining Tier 1 groundwater remediation objectives for noncarcinogenic chemicals. When more than one contaminant of concern which affects the same target organ is detected at the site, the mixture rule is applicable. That rule, which is essentially the same required under Tier 2, is found at Section 742.505(b)(3). The groundwater remediation objectives listed at Appendix B, Table E must be corrected to take into account the cumulative effect of mixtures of noncarcinogenic chemicals. There are two optional procedures for doing so. The first option at Section 742.505(b)(3) requires the calculation of weighted average using the formula set out therein. The remediation objectives are met if the weighted average is less than or equal to 1. If the weighted average is greater than 1, more remediation must be carried out until the weighted average is less than or equal to 1.
 
Alternatively, Section 742.505(b)(3) provides that the individual remediation objective be divided by the number of chemicals detected in the groundwater that affect specific target organs or organ system.
 
Finally, for any contaminants of concern not listed in Appendix B, Tables A through E, the applicant may request site-specific remediation objectives from the Agency, or propose site-specific objectives in accordance with 35 Ill. Adm. Code 620, Tier 3 at Subpart I of TACO, or both.
 



Subpart F: Tier 2 General Evaluation
 Under Tier 2, the applicant can develop soil and groundwater remediation objectives applying site-specific information to pre-established modeling equations. The Tier 2 equations are set forth in Appendix C, Tables A and C. These equations are from the SSL and the RBCA approaches. (See Appendix C, Tables A and C, respectively for the equations to be used. The values to be used in the calculations, and the appropriate units are found at Appendix C, Tables B and D.) Table B contains the values for use in the SSL equations, and Table D contains the values for the RBCA equations. These tables also contain the acceptable exposure factors for the residential, industrial/commercial and construction worker populations when the present and post-remediation land uses are evaluated. As in Tier 1, the remediation objectives in Tier 2 cannot exceed an excess cancer risk of 1 in 1,000,000 for carcinogens, or a hazard quotient of 1 for noncarcinogens. Additionally, as in Tier 1, there is a mixture rule requiring that the cumulative effect of similar-acting noncarcinogenic chemicals be evaluated in developing remediation objectives. However, unlike Tier 1, this rule is applicable to soil as well as groundwater remediation objectives.
 
 The rules generally applicable to a Tier 2 evaluation are set forth at Section 742.600. Similar to a Tier 1 analysis, the soil saturation and soil attenuation capacity restrictions found at Subpart B: Sections 742.215 and 742.220 apply. In other words, free product must be removed. (See subsections (d)(1) and (3) of Section 742.600.) Section 742.600 also instructs the applicant about how to choose the correct remediation objective if there is more than one exposure route requiring a remediation objective. This selection process is described at Section 742.600(e), (f), and (g), and presumes that the applicant has chosen to forgo the Tier 1 fixed numerical remediation objectives.
 
 At the December 3, 1996 hearing, John Sherrill, an Agency witness, gave examples demonstrating when to use a Tier 1 or 2 remediation objective. For the purposes of illustration, the remediation objectives for benzene are used. The groundwater is Class I, none of the exposure routes are excluded and the numbers from Appendix B, Table A are used. The remediation objective for benzene for the ingestion route is 22 mg/kg, for the inhalation route is 0.8 mg/kg, and the migration to groundwater route is 0.03 mg/kg. The migration to groundwater remediation objective applies as the Tier 1 soil remediation objective because it is the most stringent out of the three values. If the calculated Tier 2 soil remediation objective for an exposure route is more stringent than the Tier 1 remediation objective for the same exposure route, then the Tier 1 remediation objective applies. In the hypothetical, within Tier 2, the applicant calculates a soil remediation objective of 0.02 mg/kg. The remediation objective would then be 0.03 mg/kg because it is less stringent than the calculated Tier 2 soil remediation objective.
 
 If the calculated Tier 2 soil remediation objective for an exposure route is more stringent than one or more of the Tier 1 soil remediation objective(s) for a different exposure route, then the calculated Tier 2 soil remediation objective applies and the Tier 2 remediation objective for other exposure routes do not need to be calculated. For example, within Tier 2, the applicant calculates a migration to groundwater remediation objective of 0.1 mg/kg. The remediation objective would then be 0.1 because it is more stringent than the Tier 1 ingestion and inhalation remediation objectives (22 mg/kg and 0.8 mg/kg respectively).
 
 If the calculated Tier 2 soil remediation objective is less stringent than one or more of the Tier 1 soil remediation objectives for the remaining exposure routes, then the other Tier 2 remediation objectives are calculated and the most stringent calculated Tier 2 value applies. Within Tier 2, the applicant calculates a migration to groundwater remediation objective of 1.2 mg/kg. This is less stringent than the inhalation soil remediation objective in Tier 1. So the applicant then calculates the Tier 2 ingestion and inhalation remediation objectives. The applicant calculates an ingestion remediation objective of 30 mg/kg and an inhalation remediation objective of 11 mg/kg. Since the Tier 2 migration to groundwater remediation objective is the most stringent (1.2 is less than 30 and 11), 1.2 mg/kg is the remediation objective.
 
 As in Tier 1, the proposed land use for the site is considered in establishing Tier 2 soil remediation objectives. In a Tier 2 evaluation, the proposed land use for the site will determine the appropriate exposure factors contained in the applicable equation. The appropriate exposure factors for residential, industrial/commercial, and construction worker populations are set forth in Appendix C, Tables B and D. The established exposure factors can only be varied in a Tier 3 analysis. If a Tier 2 evaluation is based on an industrial/commercial property use, the construction worker scenario must also be evaluated. Additionally, the applicant must obtain an institutional control in accordance with the requirements of Subpart J.
 
 Finally, the mixture rule originally proposed for Tier 2 is adopted at Section 742.720 which addresses soil remediation objectives, and at Section 742.805 which addresses groundwater remediation objectives. These procedures are the same as those adopted under Tier 1 for noncarginogenic chemicals detected in groundwater. The distinction is that the mixture rule is applicable to soil remediation objectives, as well as groundwater remediation objectives. Again, these mixture rules are subject to further consideration under Docket B.
 



Subpart G: Tier 2 Soil Evaluation
 Tier 2 provides the applicant with two options for establishing soil remediation objectives: reliance on the SSL equations or on the RBCA equations. Because the RBCA equations combine the soil ingestion, inhalation of vapors and particulates, and dermal contact exposure routes, while the SSL equations treat the soil ingestion, inhalation of volatiles, and inhalation of fugitive dust exposure routes separately, the applicant must choose only one of these approaches, and the two approaches cannot be combined. However, both methods treat the soil component of the groundwater exposure route separately, so the applicant can choose to use either method to calculate the remediation objectives for this exposure route, no matter which approach was used to establish the other soil objectives.
 
 SSL Equations. The SSL equations are set forth in Appendix C, Table A. The parameters for these equations are set forth in Appendix C, Table B. The equations are divided into separate categories by exposure route: ingestion, inhalation of volatiles, inhalation of fugitive dust, and migration to groundwater.
 
 Within each exposure route’s set of equations, there are separate sets of equations for noncarcinogens and carcinogens. The equations for carcinogens reflect an expected excess cancer risk of 1 in 1,000,000, while the equations for noncarcinogens reflect a hazard quotient of 1. Within these categories, separate equations are set forth for residential, industrial/commercial, and construction worker populations. The different equations for each type of land use reflects the expected differences in the exposure factor, exposure duration, averaging time, and ingestion rate. Default values and parameters for these equations are listed in Appendix C, Table B.
 
 RBCA Equations. Appendix C, Table C contains the RBCA equations used in Tier 2. The RBCA equations for establishing soil remediation objectives are separated into three categories. The first category examines the combined exposures of soil ingestion, inhalation of vapors and particulates, or dermal contact with soil. The second category examines the ambient vapor inhalation (outdoor) route from subsurface soils. The third category is for the migration to groundwater pathway. Within each of these categories, separate equations are set forth for noncarcinogens and carcinogens. Since RBCA offers two different ways to evaluate the soil remediation objectives, the smaller, or more stringent, of the two values will be the remediation objective (either equation R1 or R7 for carcinogens and equation R2 or R8 for noncarcinogens).
 
 Unlike the SSL approach, which sets forth separate equations for each exposure route for each type of land use, RBCA does not have separate equations for each type of land use. Instead, RBCA allows for differences in the type of land use to be reflected in the values of certain parameters. Because RBCA groups ingestion and inhalation into the same equations, one model is to be used in Tier 2 for the inhalation and ingestion exposure routes. Either the RBCA or SSL models can be used for the soil component of the groundwater exposure route.
 
 The requirements concerning the cumulative effect of noncarcinogenic chemicals for soil remediation are at Section 742.720. Appendix A, Table E sets forth groups of chemicals from Appendix B, Tables A and B, that have remediation objectives based on noncarcinogenic toxicity, and that affect the same target organ. If more than one chemical detected at the site affects the same target organ, the applicant must correct the initially calculated remediation value for each chemical in the group.
 



Subpart H: Tier 2 Groundwater Evaluation
 
 Subpart H contains the procedures for developing Tier 2 groundwater remediation objectives. If the contaminants of concern exceed the applicable Tier 1 remediation objectives, an applicant has several choices. As preliminary to a Tier 1 analysis, the applicant can as a preliminary matter, demonstrate that the pathway is excluded, that the contamination is at or below the area background concentration in accordance with Subpart D, or conduct a Tier 3 analysis. There are also two alternatives distinctive to groundwater remediation objectives available. An applicant can seek from the Board reclassification of the contaminated groundwater pursuant to 35 Ill. Adm. Code 620.260, or an adjusted standard pursuant to Section 28.1 of the Act. However, should an applicant choose to develop Tier 2 groundwater remediation objectives, the applicant must use RBCA Equation R26. Using this equation, the applicant can develop remediation objectives which exceed the applicable Part 620 groundwater standards at the site, but which will meet the applicable groundwater standards at the point of human exposure.
 
Pursuant to Section 742.805, before developing a Tier 2 groundwater remediation objective, the applicant must first identify the horizontal and vertical extent of the contamination, and, to the extent practicable, take remedial action to remove any free product. The applicant can then use RBCA Equation R26 to demonstrate that the applicable groundwater standards will be achieved at the point of human exposure. The basis and application of Equation R26 to predict impacts from remaining groundwater contamination are explained in Section 742.810.
 
 Equation R26 predicts the concentration of a contaminant along the centerline of a plume, taking into account the three dimensional dispersion and biodegradation. Using Equation R26, the applicant can demonstrate that, although the concentration of a contaminant exceeds the applicable Tier 1 objective at the source, the concentration at the point of human exposure will meet either the applicable Tier 1 groundwater remediation objective, or if no Tier 1 objective exists, the applicable Health Advisory concentration as determined in accordance with the procedures set forth in 35 Ill. Adm. Code 620, Subpart F. If the applicant determines that the applicable Tier 1 objective will be exceeded at the point of human exposure, the applicant can back-calculate the concentration that must be achieved at the source in order for the compliance to be achieved.
 
 In addition to demonstrating that the applicable Tier 1 objective will be achieved at the point of human exposure, in order to demonstrate compliance pursuant to Tier 2, the applicant must demonstrate that five additional requirements are satisfied. First, using Equation R26, the applicant must demonstrate that the concentration of any contaminant in groundwater within the minimum or designated maximum setback zone of an existing potable water supply well will meet the applicable Tier 1 groundwater objective or the Health Advisory concentration 4 . Second, the applicant must demonstrate that the source of the release is not located within the minimum or designated maximum setback zone of a potable water supply well. Third, the applicant must use Equation R26 to demonstrate that the concentration of any contaminant in groundwater discharging into surface water will meet the applicable water quality standard pursuant to 35 Ill. Adm. Code 302. Fourth, the applicant must demonstrate that any groundwater remediation objective established pursuant to this procedure does not exceed the water solubility for that contaminant. Finally, if the remediation relies on an engineered barrier, the applicant must demonstrate that an institutional control is in place requiring that the barrier remain in place. These requirements are set forth at Section 742.805 and illustrated at Appendix C: Illustration B.
 
 During the public comment period, the Board received a public comment questioning whether the R26 equation in the RBCA guidelines has been properly adapted for use in establishing risk based remediation objectives under Tier 2. The commentator urged the Board to change the last erf (error function) term in the denominator of Equation R26 from 4 to 2. (PC 6.) The Agency supports the change. (PC 10 at 12-13; PC 22.) Since the supporting documents indicate that the use of the incorrect number (4) for the vertical dispersion results in under-prediction of concentrations of contaminants along the centerline of a plume, the Board adopts Equation R26 by changing the constant value for the erf relating to vertical dispersion from 4 to 2. Equation R15, essentially the same equation, is also changed where it appears in the rules.
 
 Section 742.810 contains another provision regarding the distance between an existing potable water supply well and the source of contamination. Minimum setback zones are established pursuant to Section 14.2(g) of the Act and maximum setback zones are established on a site-specific basis. Either the minimum or maximum setback zone can be used, whichever is closer. However, the minimum setback zone is to be used unless the maximum setback zone is established.
 
 Section 742.810(b)(1) provides the procedure for demonstrating that no existing potable water supply is adversely impacted by a remediation site. Essentially, the revisions to subsection (b)(1) require an applicant to calculate the distance “X” from the downgradient edge of the source to the point where the contaminant concentration is equal to the Tier 1 groundwater remediation objective or Health Advisory concentration. If there are any potable water supply wells located within the distance X downgradient of the source, then the applicable groundwater remediation objectives must be met at the edge of the minimum or designated maximum setback zone. If no potable water supply wells exist within the calculated distance X, then it can be determined that no potable water supply wells are adversely impacted.
 



Subpart I: Tier 3 Evaluation
 
 Tier 3 allows the applicant to develop remediation objectives using alternative parameters not found in Tier 1 or Tier 2. It allows the applicant great flexibility in developing remediation objectives appropriate for a particular site based upon site-specific information, rather than relying on general categories of information. The options available under Tier 3 include: use of modified parameters in the Tier 2 equations, use of alternative models, conducting a site-specific risk assessment, use of probabilistic analysis and sophisticated fate and transport models, assessment of impractical remediation, and variation of the target risk level. If any contaminants of concern are found to exceed the remediation objectives developed using the Tier 3 analysis, the applicant would be required to remediate the contamination until the objectives are achieved. The applicant must provide appropriate justification for the use and application of any alternative parameters, models, or analysis relied upon in a Tier 3 evaluation.
 
 Tier 1 remediation objectives and Tier 2 equations are based upon a one-in-a-million individual excess cancer risk for carcinogens and a hazard quotient of one for noncarcinogens. (Exh. 4 at 12 & 21.) Changes in the target risk levels are allowed under Tier 3. Section 742.900(d) clearly sets forth that requests for changes in target risk levels at the point of human exposure level must be supported with a formal risk assessment conducted in accordance with Section 742.915. Section 742.915(h) contains four factors critical in such a risk assessment. Those factors are: 1) the presence of sensitive populations; 2) the number of receptors potentially impacted; 3) the duration of risk at the differing target levels; and 4) the characteristics of the contaminants of concern.
 
 Pursuant to Section 58.5(d)(4) of the Act, an applicant can seek site-specific remediation objectives which exceed the Tier 1 remediation objectives, i.e., the Board’s groundwater quality standards at Part 620, under Tier 3. To obtain such an exception, the Act requires two demonstrations. First, the applicant must demonstrate that the exceedence of the groundwater quality standard has been minimized and the beneficial use of the groundwater has been returned, and that any threat to human health has also been minimized. These two statutory requirements are incorporated verbatim into the rules at Section 742.900(c )(9). Since the right to exceed groundwater quality standards, adopted by the Board as the level at which human health is protected, is available only due to this statutory exception, it is most important that the demonstration to obtain such a right comply with the these statutory requirements.
 



Subpart J: Institutional Controls
 
 Institutional controls are defined under the proposed rules as “a legal mechanism for imposing a restriction on land use.” The Agency testified that institutional controls are a fundamental part of the proposal, and are the key to assuring long-term protection of human health, while providing flexibility in developing practical, risk-based remediation objectives. (Exh. 3 at 1.) The applicant must obtain an institutional control whenever the applicant seeks to take any of the following measures, or any combination thereof: 1) restrict a property to industrial/commercial use; 2) establish remediation objectives based on a target cancer risk greater than 1 in 1,000,000; 3) establish a target hazard quotient greater than 1 for a noncarcinogen under a Tier 3 analysis; 4) rely on an engineered barrier; 5) set the point of human exposure at a location other than at the source; or 6) exclude exposure pathways under Subpart C. An institutional control is transferred with the property.
 
 Pursuant to Subpart J, the following types of institutional controls are recognized under these rules: 1) No Further Remediation Letters; 2) restrictive covenants, deed restrictions, and negative easements; 3) ordinances adopted and administered by a unit of local government; and 4) agreements between a property owner and a highway authority with respect to any contamination remaining under highways. The requirements for each of these categories are set forth in a separate section.
 
 The requirements for a No Further Remediation Letter are set forth at Section 742.1005. Subsection (b) therein provides that “a request for approval of a No Further Remediation Letter as an institutional control shall follow the requirements applicable to the remediation program under which the remediation is performed.” The TACO rules are intended to establish a method for deriving corrective action objectives for remedial programs. Specific provisions concerning the effectiveness and limitations on No Further Remediation Letters and other instruments memorializing a no further remediation determination by the Agency are more appropriately set forth in the specific programs pursuant to which such a determination is made.
 
 The requirements for restrictive covenants, deed restrictions, and negative easements are set forth at Section 742.1010. These measures are to be used only in situations where a No Further Remediation Letter is not available, and it is not necessary to obtain restrictive covenants, deed restrictions, or negative easements which duplicate conditions set forth in a No Further Remediation Letter that is appropriately recorded. Restrictive covenants, deed restrictions, and negative easements approved by the Agency in accordance with this Section must be appropriately recorded, together with the instrument memorializing the Agency’s no further remediation determination, e.g., a No Further Remediation Letter.
 
 Section 742.1015 sets forth the requirements for ordinances used as an institutional control. The use of an ordinance as an institutional control is specifically limited to ordinances that effectively prohibit the installation of potable water supply wells in order to meet the requirements of Section 742.320(d) or 742.805(a)(3). Unless the Agency and the unit of local government have entered into a Memorandum of Understanding (MOU), this section places the burden on the owner or successor in interest for monitoring the local governments activities with respect to the ordinance. If the ordinance is modified, or if a variance or other site-specific request is granted that allows use of the groundwater at the site as a potable water supply, or if the terms of another institutionally control at the site are violated, the use of the ordinance as an institutional control can be voided.
 
 Given the potential human health risk and the cost of groundwater remediation and installation of potable water supply wells, it makes sense to be forewarned about potential problems concerning a groundwater source. Moreover, most of the existing ordinances were not enacted by considering environmental concerns. In this regard, the regulation provides an opportunity to a unit of local government to adopt an ordinance based upon the consideration of environmental concerns. The requirements concerning the MOU at Section 742.1015(i) require the unit of local government to make a commitment to: maintain a registry of all sites within its boundaries which have received a No Further Remediation Letter and review the registry of sites prior to siting potable water supply well; consider if groundwater contamination from the sites on the registry may be present at potential well sites; and take appropriate protective measures if wells are sited in the vicinity of such locations. By requiring the local government to enter into an MOU and abiding by the commitments contained therein will forewarn communities of the existence of contamination plumes and may prevent costly mistakes in siting, construction, and use of public potable water supply wells. This provision is cross referenced at Sections 742.320(d) and 742.805(a)(3).
 
Finally, Section 742.1020 sets forth the requirements applicable to highway authority agreements used as an institutional control. When contamination level of the groundwater exceed the Tier 1 residential levels, the highway authority must agree to prohibit the use of groundwater under the highway right-of-way as a potable water supply. When the contamination of the soil under the highway right of way exceeds the Tier 1 residential level, the highway authority must agree to limit access to soil contamination, and in the event access is allowed, human health and the environment must be protected.
 



Subpart K: Engineered Barriers
 
 An engineered barrier is defined in Section 742.200 as a barrier designed or verified using engineering practices that limits exposure to or controls migration of the contaminants of concern. The Agency testified that, in addition to including man-made structures designed using engineering practices, engineered barriers could include native or in-situ materials if their effectiveness is verified using engineering practices. (Exh. 3 at 7) The use and maintenance of an engineered barrier must be accompanied by an institutional control in accordance with Subpart J. Furthermore, any no further remediation determination by the Agency based on the use of the engineered barrier must be conditioned upon maintenance of the engineered barrier, and the institutional control must address provisions for temporary breaches of the engineered barrier. Failure to maintain an engineered barrier in accordance with the terms of the no further remediation determination constitutes grounds for voidance of that determination.
 
 Section 742.1105 sets forth the requirements for engineered barriers and limitations on their use in achieving remediation objectives. It makes clear that natural attenuation, access controls and point of use treatment do not fall within the definition of engineered barriers, and that engineered barriers cannot be relied upon in determining compliance with Tier 1 remediation objectives. Subsection (c) of this Section sets forth a list of engineered barriers accepted for each exposure route. For the soil component of the groundwater ingestion exposure route, these include caps constructed of clay, asphalt, or concrete, and permanent structures, such as buildings or highways. For the soil ingestion and inhalation exposure routes, the acceptable engineered barriers include clean soil at least three feet in depth, as well as caps and permanent structures. Finally, for the groundwater component, the acceptable engineered barriers include slurry walls and hydraulic control of groundwater. Subsection (d) of this Section makes it clear that the list of accepted measures is not intended to be exhaustive and that other methods will be accepted by the Agency if they are shown to be as effective as the listed options.
 



SUMMARY

 
 The Board hereby adopts as final the new Part 742, Tiered Approach to Corrective Action Objectives. The Board has examined the substantive issues concerning the proposal initially filed by the Agency and the record and modification to the Agency’s proposal developed during this rulemaking. The Board has reserved one issue for a separate Docket B. That issue is to what extent the mixture rule adopted today should be modified to insure that risk based remediation objectives determined using TACO are protective of human health. The Board concludes that the TAOC rules set forth in the attached order provide a tiered approach for assessing risk to human health when determining remediation objectives and the methodologies acceptable for doing so on a site-specific basis. The Board further finds that these rules are economically reasonable and technically feasible. The Board anticipates that these rules will be used successfully in conjunction with the remediation programs contained in other Board rules to remediate contamination at properties throughout Illinois based on risk of human exposure and that future uses of such properties will not be modified without consideration of the adequacy of the risk-based remediation. Finally, the Board looks forward to a proposal from the Agency addressing the risk-based methodology necessary to protect the environment.



ORDER

 
 The Board hereby directs that the final notice of the following adopted rules be submitted to the Secretary of State for publication in the Illinois Register.

 
TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE G: WASTE DISPOSAL
CHAPTER I: POLLUTION CONTROL BOARD
SUBCHAPTER f: RISK BASED CLEANUP OBJECTIVES

 

PART 742
TIERED APPROACH TO CORRECTIVE ACTION OBJECTIVES

 

SUBPART A: INTRODUCTION

 
Section

742.100 Intent and Purpose
742.105 Applicability
742.110 Overview of Tiered Approach
742.115 Key Elements
742.120 Site Characterization

 

SUBPART B: GENERAL

 
Section

742.200 Definitions
742.205 Severability
742.210 Incorporations by Reference
742.215 Determination of Soil Attenuation Capacity
742.220 Determination of Soil Saturation Limit
742.225 Demonstration of Compliance with Remediation Objectives
742.230 Agency Review and Approval

 

SUBPART C: EXPOSURE ROUTE EVALUATIONS

 
Section

742.300 Exclusion of Exposure Route
742.305 Contaminant Source and Free Product Determination
742.310 Inhalation Exposure Route
742.315 Soil Ingestion Exposure Route
742.320 Groundwater Ingestion Exposure Route

 

 
SUBPART D: DETERMINING AREA BACKGROUND

 
Section

742.400 Area Background
742.405 Determination of Area Background for Soil
742.410 Determination of Area Background for Groundwater
742.415 Use of Area Background Concentrations

 
SUBPART E: TIER 1 EVALUATION

 
Section

742.500 Tier 1 Evaluation Overview
742.505 Tier 1 Soil and Groundwater Remediation Objectives
742.510 Tier 1 Remediation Objectives

 

SUBPART F: TIER 2 GENERAL EVALUATION

 
Section

742.600 Tier 2 Evaluation Overview
742.605 Land Use
742.610 Chemical and Site Properties

 

SUBPART G: TIER 2 SOIL EVALUATION
 

Section

742.700 Tier 2 Soil Evaluation Overview
742.705 Parameters for Soil Remediation Objective Equations
742.710 SSL Soil Equations
742.715 RBCA Soil Equations
742.720 Chemicals with Cumulative Noncarcinogenic Effects

SUBPART H: TIER 2 GROUNDWATER EVALUATION

 
Section

742.800 Tier 2 Groundwater Evaluation Overview
742.805 Tier 2 Groundwater Remediation Objectives
742.810 Calculations to Predict Impacts from Remaining Groundwater Contamination

 

SUBPART I: TIER 3 EVALUATION

 
Section

742.900 Tier 3 Evaluation Overview
742.905 Modifications of Parameters
742.910 Alternative Models
742.915 Formal Risk Assessments
742.920 Impractical Remediation
742.925 Exposure Routes
742.930 Derivation of Toxicological Data

 

SUBPART J: INSTITUTIONAL CONTROLS

 
Section

742.1000 Institutional Controls
742.1005 No Further Remediation Letters
742.1010 Restrictive Covenants, Deed Restrictions and Negative Easements
742.1015 Ordinances
742.1020 Highway Authority Agreements

 

SUBPART K: ENGINEERED BARRIERS

 
Section

742.1100 Engineered Barriers
742.1105 Engineered Barrier Requirements

 

APPENDIX A General
ILLUSTRATION A
Developing Soil Remediation Objectives Under the Tiered Approach
ILLUSTRATION B
Developing Groundwater Remediation Objectives Under the Tiered Approach
Table A Soil Saturation Limits (Csat) for Chemicals Whose Melting Point is Less Than 300C
Table B Tolerance Factor (K)
Table C Coefficients {AN-I+1} for W Test of Normality, for N=2(1)50
Table D Percentage Points of the W Test for N=3(1)50
Table E Chemicals with Noncarcinogenic Toxic Effects on Specific Target Organs/Organ Systems or Similar Modes of Action
Table F Chemicals with Carcinogenic Toxic Effects on Specific Target Organs/Organ Systems or Similar Modes of Action
Table G Concentrations of Inorganic Chemicals in Background Soils
APPENDIX B Tier 1 Tables and Illustrations
ILLUSTRATION A
Tier 1 Evaluation
Table A Tier 1 Soil Remediation Objectives for Residential Properties
Table B Tier 1 Soil Remediation Objectives for Industrial/Commercial Properties
Table C pH Specific Soil Remediation Objectives for Inorganics and Ionizing Organics for the Soil Component of the Groundwater Ingestion Route (Class I Groundwater)
Table D pH Specific Soil Remediation Objectives for Inorganics and Ionizing Organics for the Soil Component of the Groundwater Ingestion Route (Class II Groundwater)
Table E Tier 1 Groundwater Remediation Objectives for the Groundwater Component of the Groundwater Ingestion Route
Table F Values Used to Calculate the Tier 1 Soil Remediation Objectives for the Soil Component of the Groundwater Ingestion Route
APPENDIX C Tier 2 Tables and Illustrations
ILLUSTRATION A
Tier 2 Evaluation for Soil
ILLUSTRATION B
Tier 2 Evaluation for Groundwater
ILLUSTRATION C
US Department of Agriculture Soil Texture Classification
Table A SSL Equations
Table B SSL Parameters
Table C RBCA Equations
Table D RBCA Parameters
Table E Default Physical and Chemical Parameters
Table F Methods for Determining Physical Soil Parameters
Table G Error Function (erf)
Table H Q/C Values by Source Area
Table I Koc Values for Ionizing Organics as a Function of pH (cm3/g or L/kg)
Table J Values to be Substituted for ks When Evaluating Inorganics as a Function of pH (cm3water/gsoil)
Table K Parameter Estimates for Calculating Water-Filled Soil Porosity (q w)

 
AUTHORITY: Implementing Sections 22.4, 22.12, Title XVI, and Title XVII and authorized by Sections 27, 57.14, and 58.5 of the Environmental Protection Act [415 ILCS 5/22.4, 22.12, Title XVI and Title VII] (see P.A. 88-496, effective September 13, 1993 and P.A. 89-0431, effective December 15, 1995).
 
SOURCE: Adopted at 21 Ill. Reg. ______________ , effective July 1, 1997.
 
NOTE: Capitalization indicates statutory language.

SUBPART A: INTRODUCTION

 

Section 742.100
Intent and Purpose

 

a) This Part sets forth procedures for evaluating the risk to human health posed by environmental conditions and developing remediation objectives that achieve acceptable risk levels.

 

b) The purpose of these procedures is to provide for the adequate protection of human health and the environment based on the risks to human health posed by environmental conditions while incorporating site related information.

 
 
 
 
Section 742.105  Applicability
 

a) Any person, including a person required to perform an investigation pursuant to the Illinois Environmental Protection Act (415 ILCS 5/1 et seq.) (Act), may elect to proceed under this Part to the extent allowed by State or federal law and regulations and the provisions of this Part. A person proceeding under this Part may do so to the extent such actions are consistent with the requirements of the program under which site remediation is being addressed.

 

b) This Part is to be used in conjunction with the procedures and requirements applicable to the following programs:

 

1) Leaking Underground Storage Tanks (35 Ill. Adm. Code 731 and 732);

 

2) Site Remediation Program (35 Ill. Adm. Code 740); and

 

3) RCRA Part B Permits and Closure Plans (35 Ill. Adm. Code 724 and 725).

 

c) The procedures in this Part may not be used if their use would delay response action to address imminent and substantial threats to human health and the environment. This Part may only be used after actions to address such threats have been completed.

 

d) This Part may be used to develop remediation objectives to protect surface waters, sediments or ecological concerns, when consistent with the regulations of other programs, and as approved by the Agency.

 

e) A no further remediation determination issued by the Agency prior to July 1, 1997 pursuant to Section 4(y) of the Act or one of the programs listed in subsection (b) of this Section that approves completion of remedial action relative to a release shall remain in effect in accordance with the terms of that determination.

 

f) Site specific groundwater remediation objectives determined under this Part for contaminants of concern may exceed the groundwater quality standards established pursuant to the rules promulgated under the Illinois Groundwater Protection Act (415 ILCS 55) as long as done in accordance with Sections 742.805(a) and 742.900(c)(9). [See 415 ILCS 5/58.5(d)(4).]

 

g) Where contaminants of concern include polychlorinated biphenyls (PCBs), a person may need to evaluate the applicability of regulations adopted under the Toxic Substances Control Act. (15 U.S.C. 2601)
  
Section 742.110
Overview of Tiered Approach

 

a) This Part presents an approach for developing remediation objectives (see Appendix A, Illustrations A and B) that include an option for exclusion of pathways from further consideration, use of area background concentrations as remediation objectives and three tiers for selecting applicable remediation objectives. An understanding of human exposure routes is necessary to properly conduct an evaluation under this approach. In some cases, applicable human exposure route(s) can be excluded from further consideration prior to any tier evaluation. Selecting which tier or combination of tiers to be used to develop remediation objectives is dependent on the site-specific conditions and remediation goals. Tier 1 evaluations and Tier 2 evaluations are not prerequisites to conducting Tier 3 evaluations.

 

b) A Tier 1 evaluation compares the concentration of contaminants detected at a site to the corresponding remediation objectives for residential and industrial/commercial properties contained in Appendix B, Tables A, B, C, D and E. To complete a Tier 1 evaluation, the extent and concentrations of the contaminants of concern, the groundwater class, the land use classification, human exposure routes at the site, and, if appropriate, soil pH, must be known. If remediation objectives are developed based on industrial/commercial property use, then institutional controls under Subpart J are required.

 

c) A Tier 2 evaluation uses the risk based equations from the Soil Screening Level (SSL) and Risk Based Corrective Action (RBCA) listed in Appendix C, Tables A and C, respectively. In addition to the information that is required for a Tier 1 evaluation, site-specific information is used to calculate Tier 2 remediation objectives. As in Tier 1, Tier 2 evaluates residential and industrial/commercial properties only. If remediation objectives are developed based on industrial/commercial property use, then institutional controls under Subpart J are required.

 

d) A Tier 3 evaluation allows alternative parameters and factors, not available under a Tier 1 or Tier 2 evaluation, to be considered when developing remediation objectives. Remediation objectives developed for conservation and agricultural properties can only be developed under Tier 3.

 

e) Remediation objectives may be developed using area background concentrations or any of the three tiers if the evaluation is conducted in accordance with applicable requirements in Subparts D through I. When contaminant concentrations do not exceed remediation objectives developed under one of the tiers or area background procedures under Subpart D, further evaluation under any of the other tiers is not required.

 
 
Section 742.115  Key Elements
 
To develop remediation objectives under this Part, the following key elements shall be addressed.
 

a) Exposure Routes

 

1) This Part identifies the following as potential exposure routes to be addressed:

 

A) Inhalation;

 

B) Soil ingestion;

 

C) Groundwater ingestion; and

 

D) Dermal contact with soil.

 

2) The evaluation of exposure routes under subsections (a)(1)(A),(a)(1)(B) and (a)(1)(C) of this Section is required for all sites when developing remediation objectives or excluding exposure pathways. Evaluation of the dermal contact exposure route is required for use of RBCA equations in Appendix C, Table C or use of formal risk assessment under Section 742.915.

 

3) The groundwater ingestion exposure route is comprised of two components:

 

A) Migration from soil to groundwater (soil component); and

 

B) Direct ingestion of groundwater (groundwater component).

 

b) Contaminants of Concern

 
The contaminants of concern to be remediated depend on the following:
 

1) The materials and wastes managed at the site;

 

2) The extent of the no further remediation determination being requested from the Agency pursuant to a specific program; and

 

3) The requirements applicable to the specific program, as listed at Section 742.105(b) under which the remediation is being performed.

 

c) Land Use

 
The present and post-remediation uses of the site where exposures may occur shall be evaluated. The land use of a site, or portion thereof, shall be classified as one of the following:
 

1) Residential property;

 

2) Conservation property;

 

3) Agricultural property; or

 

4) Industrial/commercial property.

 
 

Section 742.120
Site Characterization

 
Characterization of the extent and concentrations of contamination at a site shall be performed before beginning development of remediation objectives. The actual steps and methods taken to characterize a site are determined by the requirements applicable to the specific program under which site remediation is being addressed.

SUBPART B: GENERAL

 

Section 742.200
Definitions

 
Except as stated in this Section, or unless a different meaning of a word or term is clear from the context, the definition of words or terms in this Part shall be the same as that applied to the same words or terms in the Act.
 
"Act" means the Illinois Environmental Protection Act (415 ILCS 5/1 et seq.).
 
"ADL" means Acceptable Detection Limit, which is the detectable concentration of a substance which is equal to the lowest appropriate Practical Quantitation Limit (PQL) as defined in this Section.
 
"Agency" means the Illinois Environmental Protection Agency.
 
"Agricultural Property" means any real property for which its present or post-remediation use is for growing agricultural crops for food or feed either as harvested crops, cover crops or as pasture. This definition includes, but is not limited to, properties used for confinement or grazing of livestock or poultry and for silviculture operations. Excluded from this definition are farm residences, farm outbuildings and agrichemical facilities.
 
"Area Background" means CONCENTRATIONS OF REGULATED SUBSTANCES THAT ARE CONSISTENTLY PRESENT IN THE ENVIRONMENT IN THE VICINITY OF A SITE THAT ARE THE RESULT OF NATURAL CONDITIONS OR HUMAN ACTIVITIES, AND NOT THE RESULT SOLELY OF RELEASES AT THE SITE. (Section 58.2 of the Act)
 
"ASTM" means the American Society for Testing and Materials.
 
"Board" means the Illinois Pollution Control Board.
 
"Cancer Risk" means a unitless probability of an individual developing cancer from a defined exposure rate and frequency.
 
"Cap" means a barrier designed to prevent the infiltration of precipitation or other surface water, or impede the ingestion or inhalation of contaminants.
 
"Carcinogen" means A CONTAMINANT THAT IS CLASSIFIED AS A CATEGORY A1 OR A2 CARCINOGEN BY THE AMERICAN CONFERENCE OF GOVERNMENTAL INDUSTRIAL HYGIENISTS; A CATEGORY 1 OR 2A/2B CARCINOGEN BY THE WORLD HEALTH ORGANIZATION'S INTERNATIONAL AGENCY FOR RESEARCH ON CANCER; A "HUMAN CARCINOGEN" OR "ANTICIPATED HUMAN CARCINOGEN" BY THE UNITED STATES DEPARTMENT OF HEALTH AND HUMAN SERVICE NATIONAL TOXICOLOGICAL PROGRAM; OR A CATEGORY A OR B1/B2 CARCINOGEN BY THE UNITED STATES ENVIRONMENTAL PROTECTION AGENCY IN the INTEGRATED RISK INFORMATION SYSTEM OR A FINAL RULE ISSUED IN A FEDERAL REGISTER NOTICE BY THE USEPA. (Section 58.2 of the Act)
 
"Class I Groundwater" means groundwater that meets the Class I: Potable Resource Groundwater criteria set forth in 35 Illinois Administrative Code 620.
 
"Class II Groundwater" means groundwater that meets the Class II: General Resource Groundwater criteria set forth in 35 Illinois Administrative Code 620.
 
"Conservation Property" means any real property for which present or post-remediation use is primarily for wildlife habitat.
 
"Construction Worker" means a person engaged on a temporary basis to perform work involving invasive construction activities including, but not limited to, personnel performing demolition, earth-moving, building, and routine and emergency utility installation or repair activities.
 
"Contaminant of Concern" or "Regulated Substance of Concern" means ANY CONTAMINANT THAT IS EXPECTED TO BE PRESENT AT THE SITE BASED UPON PAST AND CURRENT LAND USES AND ASSOCIATED RELEASES THAT ARE KNOWN TO THE person conducting a remediation BASED UPON REASONABLE INQUIRY. (Section 58.2 of the Act)
 
"Engineered Barrier" means a barrier designed or verified using engineering practices that limits exposure to or controls migration of the contaminants of concern.
 
"Exposure Route" means the transport mechanism by which a contaminant of concern reaches a receptor.
 
"Free Product" means a contaminant that is present as a non-aqueous phase liquid for chemicals whose melting point is less than 30oC (e.g., liquid not dissolved in water).
 
"GROUNDWATER" MEANS UNDERGROUND WATER WHICH OCCURS WITHIN THE SATURATED ZONE AND GEOLOGIC MATERIALS WHERE THE FLUID PRESSURE IN THE PORE SPACE IS EQUAL TO OR GREATER THAN ATMOSPHERIC PRESSURE. (Section 3.64 of the Act)
 
"Groundwater Quality Standards" means the standards for groundwater as set forth in 35 Illinois Administrative Code 620.
 
"Hazard Quotient" means the ratio of a single substance exposure level during a specified time period to a reference dose for that substance derived from a similar exposure period.
 
“Highway” means ANY PUBLIC WAY FOR VEHICULAR TRAVEL WHICH HAS BEEN LAID OUT IN PURSUANCE OF ANY LAW OF THIS STATE, OR OF THE TERRITORY OF ILLINOIS, OR WHICH HAS BEEN ESTABLISHED BY DEDICATION, OR USED BY THE PUBLIC AS A HIGHWAY FOR 15 YEARS, OR WHICH HAS BEEN OR MAY BE LAID OUT AND CONNECT A SUBDIVISION OR PLATTED LAND WITH A PUBLIC HIGHWAY AND WHICH HAS BEEN DEDICATED FOR THE USE OF THE OWNERS OF THE LAND INCLUDED IN THE SUBDIVISION OR PLATTED LAND WHERE THERE HAS BEEN AN ACCEPTANCE AND USE UNDER SUCH DEDICATION BY SUCH OWNERS, AND WHICH HAS NOT BEEN VACATED IN PURSUANCE OF LAW. THE TERM “HIGHWAY” INCLUDES RIGHTS OF WAY, BRIDGES, DRAINAGE STRUCTURES, SIGNS, GUARD RAILS, PROTECTIVE STRUCTURES AND ALL OTHER STRUCTURES AND APPURTENANCES NECESSARY OR CONVENIENT FOR VEHICULAR TRAFFIC. A HIGHWAY IN A RURAL AREA MAY BE CALLED A “ROAD”, WHILE A HIGHWAY IN A MUNICIPAL AREA MAY BE CALLED A “STREET”. (Illinois Highway Code [605 ILCS 5/2-202])
 
“Highway Authority” means THE DEPARTMENT of Transportation WITH RESPECT TO A STATE HIGHWAY; THE COUNTY BOARD WITH RESPECT TO A COUNTY HIGHWAY OR A COUNTY UNIT DISTRICT ROAD IF A DISCRETIONARY FUNCTION IS INVOLVED AND THE COUNTY SUPERINTENDENT OF HIGHWAYS IF A MINISTERIAL FUNCTION IS INVOLVED; THE HIGHWAY COMMISSIONER WITH RESPECT TO A TOWNSHIP OR DISTRICT ROAD NOT IN A COUNTY UNIT ROAD DISTRICT; OR THE CORPORATE AUTHORITIES OF A MUNICIPALITY WITH RESPECT TO A MUNICIPAL STREET. (Illinois Highway Code [605 ILCS 5/2-213])
 
"Human Exposure Pathway" means a physical condition which may allow for a risk to human health based on the presence of all of the following: contaminants of concern; an exposure route; and a receptor activity at the point of exposure that could result in contaminant of concern intake.
 
"Industrial/Commercial Property" means any real property that does not meet the definition of residential property, conservation property or agricultural property.
 
"Infiltration" means the amount of water entering into the ground as a result of precipitation.
 
"Institutional Control" means a legal mechanism for imposing a restriction on land use, as described in Subpart J.
 
"Man-Made Pathways" means CONSTRUCTED physical conditions THAT MAY ALLOW FOR THE TRANSPORT OF REGULATED SUBSTANCES INCLUDING, BUT NOT LIMITED TO, SEWERS, UTILITY LINES, UTILITY VAULTS, BUILDING FOUNDATIONS, BASEMENTS, CRAWL SPACES, DRAINAGE DITCHES, OR PREVIOUSLY EXCAVATED AND FILLED AREAS. (Section 58.2 of the Act)
 
"Natural Pathways" means NATURAL physical conditions that may allow FOR THE TRANSPORT OF REGULATED SUBSTANCES INCLUDING, BUT NOT LIMITED TO, SOIL, GROUNDWATER, SAND SEAMS AND LENSES, AND GRAVEL SEAMS AND LENSES. (Section 58.2 of the Act)
 
"Negative Easement" means a right of the owner of the dominant or benefitted estate or property to restrict the property rights of the owner of the servient or burdened estate or property.
 
"Person" means an INDIVIDUAL, TRUST, FIRM, JOINT STOCK COMPANY, JOINT VENTURE, CONSORTIUM, COMMERCIAL ENTITY, CORPORATION (INCLUDING A GOVERNMENT CORPORATION), PARTNERSHIP, ASSOCIATION, STATE, MUNICIPALITY, COMMISSION, POLITICAL SUBDIVISION OF A STATE, OR ANY INTERSTATE BODY INCLUDING THE UNITED STATES GOVERNMENT AND EACH DEPARTMENT, AGENCY, AND INSTRUMENTALITY OF THE UNITED STATES. (Section 58.2 of the Act)
 
"Point of Human Exposure" means the point(s) at which human exposure to a contaminant of concern may reasonably be expected to occur. The point of human exposure is at the source, unless an institutional control limiting human exposure for the applicable exposure route has been or will be in place, in which case the point of human exposure will be the boundary of the institutional control. Point of human exposure may be at a different location than the point of compliance.
 
"PQL" means Practical Quantitation Limit or estimated quantitation limit, which is the lowest concentration that can be reliably measured within specified limits of precision and accuracy for a specific laboratory analytical method during routine laboratory operating conditions in accordance with "Test Methods for Evaluating Solid Wastes, Physical/Chemical Methods", EPA Publication No. SW-846, incorporated by reference in Section 742.210. When applied to filtered water samples, PQL includes the method detection limit or estimated detection limit in accordance with the applicable method revision in: "Methods for the Determination of Organic Compounds in Drinking Water", Supplement II", EPA Publication No. EPA/600/4-88/039; "Methods for the Determination of Organic Compounds in Drinking Water, Supplement III", EPA Publication No. EPA/600/R-95/131, all of which are incorporated by reference in Section 742.210.
 
"RBCA" means Risk Based Corrective Action as defined in ASTM E-1739-95, as incorporated by reference in Section 742.210.
 
"RCRA" means the Resource Conservation and Recovery Act of 1976. (42 U.S.C. 6921)
 
"Reference Concentration (RfC)" means an estimate of a daily exposure, in units of milligrams of chemical per cubic meter of air (mg/m3), to the human population (including sensitive subgroups) that is likely to be without appreciable risk of deleterious effects during a portion of a lifetime (up to approximately seven years, subchronic) or for a lifetime (chronic).
 
"Reference Dose (RfD)" means an estimate of a daily exposure, in units of milligrams of chemical per kilogram of body weight per day (mg/kg/d), to the human population (including sensitive subgroups) that is likely to be without appreciable risk of deleterious effects during a portion of a lifetime (up to approximately seven years, subchronic) or for a lifetime (chronic).
 
"Regulated Substance" means ANY HAZARDOUS SUBSTANCE AS DEFINED UNDER SECTION 101(14) OF THE COMPREHENSIVE ENVIRONMENTAL RESPONSE, COMPENSATION, AND LIABILITY ACT OF 1980 (P.L. 96-510) AND PETROLEUM PRODUCTS INCLUDING CRUDE OIL OR ANY FRACTION THEREOF, NATURAL GAS, NATURAL GAS LIQUIDS, LIQUEFIED NATURAL GAS, OR SYNTHETIC GAS USABLE FOR FUEL (OR MIXTURES OF NATURAL GAS AND SUCH SYNTHETIC GAS). (Section 58.2 of the Act)
 
"Residential Property" MEANS ANY REAL PROPERTY THAT IS USED FOR HABITATION BY INDIVIDUALS, OR where children have the opportunity for exposure to contaminants through soil ingestion or inhalation at educational facilities, health care facilities, child care facilities or outdoor recreational areas.

"Restrictive Covenant or Deed Restriction" means a provision placed in a deed limiting the use of the property and prohibiting certain uses. (Black's Law Dictionary, 5th Edition)
 
“Right of Way” means THE LAND, OR INTEREST THEREIN, ACQUIRED FOR OR DEVOTED TO A HIGHWAY. (Illinois Highway Code [605 ILCS 5/2-217])
 
"Site" means ANY SINGLE LOCATION, PLACE, TRACT OF LAND OR PARCEL OF PROPERTY, OR PORTION THEREOF, INCLUDING CONTIGUOUS PROPERTY SEPARATED BY A PUBLIC RIGHT-OF-WAY. (Section 58.2 of the Act)
 
"Slurry Wall" means a man-made barrier made of geologic material which is constructed to prevent or impede the movement of contamination into a certain area.
 
"Soil Saturation Limit (Csat)" means the contaminant concentration at which soil pore air and pore water are saturated with the chemical and the adsorptive limits of the soil particles have been reached.
 
"Solubility" means a chemical specific maximum amount of solute that can dissolve in a specific amount of solvent (groundwater) at a specific temperature.
“SPLP” means Synthetic Precipitation Leaching Procedure (Method 1312) as published in “Test Methods for Evaluating Solid Waste, Physical/Chemical Methods”, USEPA Publication No. SW-846, as incorporated by reference in Section 742.210.
"SSL" means Soil Screening Levels as defined in USEPA's Soil Screening Guidance: User's Guide and Technical Background Document, as incorporated by reference in Section 742.210.
 
"Stratigraphic Unit" means a site-specific geologic unit of native deposited material and/or bedrock of varying thickness (e.g., sand, gravel, silt, clay, bedrock, etc.). A change in stratigraphic unit is recognized by a clearly distinct contrast in geologic material or a change in physical features within a zone of gradation. For the purposes of this Part, a change in stratigraphic unit is identified by one or a combination of differences in physical features such as texture, cementation, fabric, composition, density, and/or permeability of the native material and/or bedrock.
 
"TCLP" means Toxicity Characteristic Leaching Procedure (Method 1311) as published in "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods," USEPA Publication No. SW-846, as incorporated by reference in Section 742.210.
 
"Total Petroleum Hydrocarbon (TPH)" means the additive total of all petroleum hydrocarbons found in an analytical sample.
 
"Volatile Organic Compounds (VOCs)" means organic chemical analytes identified as volatiles as published in "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods,"USEPA Publication No. SW-846 (incorporated by reference in Section 742.210), method numbers 8010, 8011, 8015, 8020, 8021, 8030, 8031, 8240, 8260, 8315, and 8316. For analytes not listed in any category in those methods, those analytes which have a boiling point less than 2000C and a vapor pressure greater than 0.1 Torr (mm Hg) at 200C.
 

Section 742.205
Severability

 
If any provision of this Part or its application to any person or under any circumstances is adjudged invalid, such adjudication shall not affect the validity of this Part as a whole or any portion not adjudged invalid.
Section 742.210  Incorporations by Reference
 

a) The Board incorporates the following material by reference:

 
ASTM. American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103 (215) 299-5400
 
ASTM D 2974-87, Standard Test Methods for Moisture, Ash and Organic Matter of Peat and Other Organic Soils, approved May 29, 1987 (reapproved 1995).
 
ASTM D 2488-93, Standard Practice for Description and Identification of Soils (Visual-Manual Procedure), approved September 15, 1993.
 
ASTM D 1556-90, Standard Test Method for Density and Unit Weight of Soil in Place by the Sand-Cone Method, approved June 29, 1990.
 
ASTM D 2167-94, Standard Test Method for Density and Unit Weight of Soil in Place by the Rubber Balloon Method, approved March 15, 1994.
 
ASTM D 2922-91, Standard Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth), approved December 23, 1991.
 
ASTM D 2937-94, Standard Test Method for Density of Soil in Place by the Drive-Cylinder Method, approved June 15, 1994.
 
ASTM D 854-92, Standard Test Method for Specific Gravity of Soils, approved November 15, 1992.
 
ASTM D 2216-92, Standard Method for Laboratory Determination of Water (Moisture) Content of Soil and Rock, approved June 15, 1992.
 
ASTM D 4959-89, Standard Test Method for Determination of Water (Moisture) Content of Soil by Direct Heating Method, approved June 30, 1989 (reapproved 1994).
 
ASTM D 4643-93, Standard Test Method for Determination of Water (Moisture) Content of Soil by the Microwave Oven Method, approved July 15, 1993.
 
ASTM D 5084-90, Standard Test Method for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter, approved June 29, 1990.
 
ASTM D 422-63, Standard Test Method for Particle-Size Analysis of Soils, approved November 21, 1963 (reapproved 1990).
 
ASTM D 1140-92, Standard Test Method for Amount of Material in Soils Finer than the No. 200 (75 m m) Sieve, approved November 15, 1992.
 
ASTM D 3017-88, Standard Test Method for Water Content of Soil and Rock in Place by Nuclear Methods (Shallow Depth), approved May 27, 1988.
 
ASTM D 4525-90, Standard Test Method for Permeability of Rocks by Flowing Air, approved May 25, 1990.
 
ASTM D 2487-93, Standard Test Method for Classification of Soils for Engineering Purposes, approved September 15, 1993.
 
ASTM E 1527-93, Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process, approved March 15, 1993. Vol. 11.04.
 
ASTM E 1739-95, Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release Sites, approved September 10, 1995.
 
Barnes, Donald G. and Dourson, Michael. (1988). Reference Dose (RfD): Description and Use in Health Risk Assessments. Regulatory Toxicology and Pharmacology. 8, 471-486.
 
GPO. Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20401, (202) 783-3238.
 
USEPA Guidelines for Carcinogenic Risk Assessment, 51 Fed. Reg. 33992-34003 (September 24, 1986).
 
"Test Methods for Evaluating Solid Waste, Physical/Chemical Methods," USEPA Publication number SW-846 (Third Edition, November 1986), as amended by Updates I and IIA (Document No. 955-001-00000-1)(contact USEPA, Office of Solid Waste, for Update IIA).
 
"Methods for the Determination of Organic Compounds in Drinking Water", EPA Publication No. EPA/600/4-88/039 (December 1988 (Revised July 1991)).
 
"Methods for the Determination of Organic Compounds in Drinking Water, Supplement II", EPA Publication No. EPA/600/R-92/129 (August 1992).
 
"Methods for the Determination of Organic Compounds in Drinking Water, Supplement III", EPA Publication No. EPA/600/R-95/131 (August 1995).
 
IRIS. Integrated Risk Information System, National Center for Environmental Assessment, U.S. Environmental Protection Agency, 26 West Martin Luther King Drive, MS-190, Cincinnati, OH 45268. (513) 569-7254.
 
"Reference Dose (RfD): Description and Use in Health Risk Assessments", Background Document 1A (March 15, 1993).
 
"EPA Approach for Assessing the Risks Associated with Chronic Exposures to Carcinogens", Background Document 2 (January 17, 1992).
 
Nelson, D.W., and L.E. Sommers. 1982. Total carbon, organic carbon, and organic matter. In: A.L. Page (ed.), Methods of Soil Analysis. Part 2. Chemical and Microbiological Properties. 2nd Edition, pp. 539-579, American Society of Agronomy. Madison, WI.
 
NTIS. National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161, (703) 487-4600.
 
"Dermal Exposure Assessment: Principles and Applications", EPA Publication No. EPA/600/8-91/011B (January 1992).
 
"Exposure Factors Handbook", EPA Publication No. EPA/600/8-89/043 (July 1989).
 
"Risk Assessment Guidance for Superfund, Vol. I; Human Health Evaluation Manual, Supplemental Guidance: Standard Default Exposure Factors", OSWER Directive 9285.6-03 (March 1991).
 
“Rapid Assessment of Exposure to Particulate Emissions from Surface Contamination Sites,” EPA Publication No. EPA/600/8-85/002 (February 1985), PB 85-192219.
 
"Risk Assessment Guidance for Superfund, Volume I; Human Health Evaluation Manual (Part A)", Interim Final, EPA Publication No. EPA/540/1-89/002 (December 1989).
 
"Risk Assessment Guidance for Superfund, Volume I; Human Health Evaluation Manual, Supplemental Guidance, Dermal Risk Assessment Interim Guidance", Draft (August 18, 1992).
 
"Soil Screening Guidance: Technical Background Document", EPA Publication No. EPA/540/R-95/128, PB96-963502 (May 1996).
 
"Soil Screening Guidance: User's Guide", EPA Publication No. EPA/540/R-96/018, PB96-963505 (April 1996).
 
"Superfund Exposure Assessment Manual", EPA Publication No. EPA/540/1-88/001 (April 1988).
 
RCRA Facility Investigation Guidance, Interim Final, developed by USEPA (EPA 530/SW-89-031), 4 volumes (May 1989).
 

b) CFR (Code of Federal Regulations). Available from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402 (202) 783-3238:

 
40 CFR 761.120 (1993).
 

c) This Section incorporates no later editions or amendments.

 

Section 742.215
Determination of Soil Attenuation Capacity

 

a) The concentrations of organic contaminants of concern remaining in the soil shall not exceed the attenuation capacity of the soil, as determined under subsection (b) of this Section.

 

b) The soil attenuation capacity is not exceeded if:

 

1) The sum of the organic contaminant residual concentrations analyzed for the purposes of the remediation program for which the analysis is performed, at each discrete sampling point, is less than the natural organic carbon fraction of the soil. If the information relative to the concentration of other organic contaminants is available, such information shall be included in the sum. The natural organic carbon fraction (foc) shall be either:

 

A) A default value of 6000 mg/kg for soils within the top meter and 2000 mg/kg for soils below one meter of the surface; or

 

B) A site-specific value as measured by ASTM D2974-87, Nelson and Sommers, or by SW-846 Method 9060: Total Organic Carbon, as incorporated by reference in Section 742.210;

 

2) The total petroleum hydrocarbon concentration is less than the natural organic carbon fraction of the soil as demonstrated using a method approved by the Agency. The method selected shall be appropriate for the contaminants of concern to be addressed; or

 

3) Another method, approved by the Agency, shows that the soil attenuation capacity is not exceeded.

 
Section 742.220  Determination of Soil Saturation Limit
 

a) For any organic contaminant that has a melting point below 300C, the remediation objective for the inhalation exposure route developed under Tier 2 or Tier 3 shall not exceed the soil saturation limit, as determined under subsection (c) of this Section.

 

b) For any organic contaminant, the remediation objective under Tier 2 or Tier 3 for the soil component of the groundwater ingestion exposure route shall not exceed the soil saturation limit, as determined under subsection (c) of this Section.

 

c) The soil saturation limit shall be:

 

1) The value listed in Appendix A, Table A for that specific contaminant;

 

2) A value derived from Equation S29 in Appendix C, Table A; or

 

 
3) A value derived from another method approved by the Agency.
Section 742.225 Demonstration of Compliance with Remediation Objectives

 
Compliance is achieved if each sample result does not exceed that respective remediation objective unless a person elects to proceed under subsections (c), (d) and (e) of this Section.

a) Compliance with groundwater remediation objectives developed under Subparts D through F and H through I shall be demonstrated by comparing the contaminant concentrations of discrete samples at each sample point to the applicable groundwater remediation objective. Sample points shall be determined by the program under which remediation is performed.

 

b) Unless the person elects to composite samples or average sampling results as provided in subsections (c) and (d) of this Section, compliance with soil remediation objectives developed under Subparts D through G and I shall be demonstrated by comparing the contaminant concentrations of discrete samples to the applicable soil remediation objective.

 

1) Except as provided in subsections (c) and (d) of this Section, compositing of samples is not allowed.

 

2) Except as provided in subsections (c) and (d) of this Section, averaging of sample results is not allowed.

 

3) Notwithstanding subsections (c) and (d) of this Section, compositing of samples and averaging of sample results is not allowed for the construction worker population.

 

4) The number of sampling points required to demonstrate compliance is determined by the requirements applicable to the program under which remediation is performed.

 

c) If a person chooses to composite soil samples or average soil sample results to demonstrate compliance relative to the soil component of the groundwater ingestion exposure route, the following requirements apply:

 

1) A minimum of two sampling locations for every 0.5 acre of contaminated area is required, with discrete samples at each sample location obtained at every two feet of depth, beginning at six inches below the ground surface and continuing through the zone of contamination. Alternatively, a sampling method may be approved by the Agency based on an appropriately designed site-specific evaluation. Samples obtained at or below the water table shall not be used in compositing or averaging.

 

2) For contaminants of concern other than volatile organic contaminants:

 

A) Discrete samples from the same boring may be composited.

 

B) Discrete sample results from the same boring may be averaged.

 

3) For volatile organic contaminants:

 

A) Compositing of samples is not allowed.

 

B) Discrete sample results from the same boring may be averaged.

 

d) If a person chooses to composite soil samples or average soil sample results to demonstrate compliance relative to the inhalation exposure route or ingestion exposure route, the following requirements apply:

 

  
1) A person shall submit a sampling plan for Agency approval, based upon a site-specific evaluation;
2) For volatile organic compounds, compositing of samples is not allowed; and

   3)  All samples shall be collected within the contaminated area.
 

e) When averaging under this Section, if no more than 50% of sample results are reported as "non-detect", "no contamination", "below detection limits", or similar terms, such results shall be included in the averaging calculation as one-half of the reported analytical detection limit for the contaminant. If more than 50% of sample results are "non-detect", another statistically valid procedure approved by the Agency may be used to determine an average.

 
Section 742.230  Agency Review and Approval
 

a) Documents and requests filed with the Agency under this Part shall be submitted in accordance with the procedures applicable to the specific program under which remediation is performed.

 

b) Agency review and approval of documents and requests under this Part shall be performed in accordance with the procedures applicable to the specific program under which the remediation is performed.

SUBPART C: EXPOSURE ROUTE EVALUATIONS

 

Section 742.300
Exclusion of Exposure Route

 

a) This Subpart sets forth requirements to demonstrate that an actual or potential impact to a receptor or potential receptor from a contaminant of concern can be excluded from consideration from one or more exposure routes. If an evaluation under this Part demonstrates the applicable requirements for excluding an exposure route are met, then the exposure route is excluded from consideration and no remediation objective(s) need be developed for that exposure route.

 

 
b) No exposure route may be excluded from consideration until characterization of the extent and concentrations of contaminants of concern at a site has been performed. The actual steps and methods taken to characterize a site shall be determined by the specific program requirements under which the site remediation is being addressed.
c) As an alternative to the use of the requirements in this Part, a person may use the procedures for evaluation of exposure routes under Tier 3 as set forth in Section 742.925.

 

Section 742.305
Contaminant Source and Free Product Determination

 
No exposure route shall be excluded from consideration relative to a contaminant of concern unless the following requirements are met:
 

a) The sum of the concentrations of all organic contaminants of concern shall not exceed the attenuation capacity of the soil as determined under Section 742.215;

 

b) The concentrations of any organic contaminants of concern remaining in the soil shall not exceed the soil saturation limit as determined under Section 742.220;

 

c) Any soil which contains contaminants of concern shall not exhibit any of the characteristics of reactivity for hazardous waste as determined under 35 Ill. Adm. Code 721.123;

 

d) Any soil which contains contaminants of concern shall not exhibit a pH less than or equal to 2.0 or greater than or equal to 12.5, as determined by SW-846 Method 9040B:pH Electrometric for soils with 20 % or greater aqueous (moisture) content or by SW-846 Method 9045C:Soil pH for soils with less than 20% aqueous (moisture) content as incorporated by reference in Section 742.210; and

 

e) Any soil which contains contaminants of concern in the following list of inorganic chemicals or their salts shall not exhibit any of the characteristics of toxicity for hazardous waste as determined by 35 Ill. Adm. Code 721.124, or an alternative method approved by the Agency: arsenic, barium, cadmium, chromium, lead, mercury, selenium or silver.

Section 742.310  Inhalation Exposure Route
 
The inhalation exposure route may be excluded from consideration if:
 

a) The requirements of Sections 742.300 and 742.305 are met; and

 

b) An institutional control, in accordance with Subpart J, is in place that meets the following requirements:

 

1) Either:
A) The concentration of any contaminant of concern the land surface or any man-made pathway shall not exceed the Tier 1 remediation objective under Subpart E for the inhalation exposure route; or
 
B) An engineered barrier, as set forth in Subpart K and approved by the Agency, is in place; and 
2) Requires safety precautions for the construction worker if the Tier 1 construction worker remediation objectives are exceeded.

Section 742.315  Soil Ingestion Exposure Route
 
The soil ingestion exposure route may be excluded from consideration if:
 

 
a) The requirements of Sections 742.300 and 742.305 are met; and
b) An institutional control, in accordance with Subpart J, is in place that meets the following requirements:
1) Either:

 

A) The concentration of any contaminant of concern within three feet of the land surface shall not exceed the Tier 1 remediation objective under Subpart E for the ingestion of soil exposure route; or
B) An engineered barrier, as set forth in Subpart K and approved by the Agency, is in place; and
 
2) Requires safety precautions for the construction worker if the Tier 1 construction worker remediation objectives are exceeded.

 

Section 742.320
Groundwater Ingestion Exposure Route

 
The groundwater ingestion exposure route may be excluded from consideration if:
 

a) The requirements of Sections 742.300 and 742.305 are met;
b) The corrective action measures have been completed to remove any free product to the maximum extent practicable;
c) The source of the release is not located within the minimum or designated maximum setback zone or within a regulated recharge area of a potable water supply well;
d) As demonstrated in accordance with Section 742.1015, for any area within 2500 feet from the source of the release, an ordinance adopted by a unit of local government is in place that effectively prohibits the installation of potable water supply wells (and the use of such wells); 

 

e) As demonstrated using Equation R26, in Appendix C, Table C, in accordance with Section 742.810, the concentration of any contaminant of concern in groundwater within the minimum or designated maximum setback zone of an existing potable water supply well will meet the applicable Tier 1 groundwater remediation objective; and

 

f) As demonstrated using Equation R26, in Appendix C, Table C, in accordance with Section 742.810, the concentration of any contaminant of concern in groundwater discharging into a surface water will meet the applicable surface water quality standard under 35 Ill. Adm. Code 302.

 

SUBPART D: DETERMINING AREA BACKGROUND

 

Section 742.400
Area Background

 
This Subpart provides procedures for determining area background concentrations for contaminants of concern. Except as described in Section 742.415(c) and (d) of this Subpart, area background concentrations may be used as remediation objectives for contaminants of concern at a site.
 

Section 742.405
Determination of Area Background for Soil

 

a) Soil sampling results shall be obtained for purposes of determining area background levels in accordance with the following procedures:

 

1) For volatile organic contaminants, sample results shall be based on discrete samples;

 

2) Unless an alternative method is approved by the Agency, for contaminants other than volatile organic contaminants, sample results shall be based on discrete samples or composite samples. If a person elects to use composite samples, each 0.5 acre of the area to be sampled shall be divided into quadrants and 5 aliquots of equal volume per quadrant shall be composited into 1 sample;

 

3) Samples shall be collected from similar depths and soil types, which shall be consistent with the depths and soil types in which maximum levels of contaminants are found in the areas of known or suspected releases; and

 

4) Samples shall be collected from areas of the site or adjacent to the site that are unaffected by known or suspected releases at or from the site. If the sample results show an impact from releases at or from the site, then the sample results shall not be included in determining area background levels under this Part.

 

b) Area background shall be determined according to one of the following approaches:

 

1) Statewide Area Background Approach:

 

A) The concentrations of inorganic chemicals in background soils listed in Appendix A, Table G may be used as the upper limit of the area background concentration for the site. The first column to the right of the chemical name presents inorganic chemicals in background soils for counties within Metropolitan Statistical Areas. Counties within Metropolitan Statistical Areas are identified in Appendix A, Table G, Footnote a. Sites located in counties outside Metropolitan Statistical Areas shall use the concentrations of inorganic chemicals in background soils shown in the second column to the right of the chemical name.

 

B) Soil area background concentrations determined according to this statewide area background approach shall be used as provided in Section 742.415(b) of this Part. For each parameter whose sampling results demonstrate concentrations above those in Appendix A, Table G, the person shall develop appropriate soil remediation objectives in accordance with this Part, or may determine area background in accordance with subsection (b)(2) of this Section.

 

2) A statistically valid approach for determining area background concentrations appropriate for the characteristics of the data set, and approved by the Agency.

 

Section 742.410
Determination of Area Background for Groundwater

 

a) Groundwater sampling results shall be obtained for purposes of determining area background in accordance with the following procedures:

 

1) Samples shall be collected from areas of the site or adjacent to the site that are unaffected by releases at the site;

 

2) The background monitoring wells shall be sufficient in number to account for the spatial and temporal variability, size, and number of known or suspected off-site releases of contaminants of concern, and the hydrogeological setting of the site;

 

3) The samples shall be collected in consecutive quarters for a minimum of one year for each well unless another sample schedule is approved by the Agency;

 

4) The samples shall be collected from the same stratigraphic unit(s) as the groundwater contamination at the site; and

 

5) The background monitoring wells shall be located hydraulically upgradient from the release(s) of contaminants of concern, unless a person demonstrates to the Agency that the upgradient location is undefinable or infeasible.

 

b) Area background shall be determined according to one of the following approaches:

 

1) Prescriptive Approach:

 

A) If more than 15% of the groundwater sampling results for a chemical obtained in accordance with subsection (a) of this Section are less than the appropriate detection limit for that chemical, the Prescriptive Approach may not be used for that chemical. If 15% or less of the sampling results are less than the appropriate detection limit, a concentration equal to one-half the detection limit shall be used for that chemical in the calculations contained in this Prescriptive Approach.

 

B) The groundwater sampling results obtained in accordance with subsection (a) of this Section shall be used to determine if the sample set is normally distributed. The Shapiro-Wilk Test of Normality shall be used to determine whether the sample set is normally distributed, if the sample set for the background well(s) contains 50 or fewer samples. Values necessary for the Shapiro-Wilk Test of Normality shall be determined using Appendix A, Tables C and D. If the computed value of W is greater than the 5% Critical Value in Appendix A, Table D, the sample set shall be assumed to be normally distributed, and the Prescriptive Approach is allowed. If the computed value of W is less than 5% Critical Value in Appendix A, Table D, the sample set shall be assumed to not be normally distributed, and the Prescriptive Approach shall not be used.

 

C) If the sample set contains at least ten sample results, the Upper Tolerance Limit (UTL) of a normally distributed sample set may be calculated using the mean (x) and standard deviation(s), from:

 
UTL = x + (K · s),
 
where K = the one-sided normal tolerance factor for estimating the 95% upper confidence limit of the 95th percentile of a normal distribution. Values for K shall be determined using Appendix A, Table B.
 

D) If the sample set contains at least ten sample results, the UTL shall be the upper limit of the area background concentration for the site. If the sample set contains fewer than ten sample results, the maximum value of the sample set shall be the upper limit of the area background concentration for the site.

 

E) This Prescriptive Approach shall not be used for determining area background for the parameter pH.

 

2) Another statistically valid approach for determining area background concentrations appropriate for the characteristics of the data set, and approved by the Agency.

 

Section 742.415
Use of Area Background Concentrations

 

a) A person may request that area background concentrations determined pursuant to Sections 742.405 and 742.410 be used according to the provisions of subsection (b) of this Section. Such request shall address the following:

 

1) The natural or man-made pathways of any suspected off-site contamination reaching the site;

 

2) Physical and chemical properties of suspected off-site contaminants of concern reaching the site; and

 

3) The location and justification of all background sampling points.

 

b) Except as specified in subsections (c) and (d) of this Section, an area background concentration may be used as follows:

 

1) To support a request to exclude a chemical as a contaminant of concern from further consideration for remediation at a site due to its presence as a result of background conditions; or

 

2) As a remediation objective for a contaminant of concern at a site in lieu of an objective developed pursuant to the other procedures of this Part.

 

c) An area background concentration shall not be used IN THE EVENT THAT THE AGENCY HAS DETERMINED IN WRITING THAT THE BACKGROUND LEVEL FOR A REGULATED SUBSTANCE POSES AN ACUTE THREAT TO HUMAN HEALTH OR THE ENVIRONMENT AT THE SITE WHEN CONSIDERING THE POST-REMEDIAL ACTION LAND USE. (Section 58.5(b)(3) of the Act)

 

d) IN THE EVENT THAT THE CONCENTRATION OF A REGULATED SUBSTANCE OF CONCERN ON THE SITE EXCEEDS A REMEDIATION OBJECTIVE ADOPTED BY THE BOARD FOR RESIDENTIAL LAND USE, THE PROPERTY MAY NOT BE CONVERTED TO RESIDENTIAL USE UNLESS SUCH REMEDIATION OBJECTIVE OR AN ALTERNATIVE RISK-BASED REMEDIATION OBJECTIVE FOR THAT REGULATED SUBSTANCE OF CONCERN IS FIRST ACHIEVED. If the land use is restricted, there shall be an institutional control in place in accordance with Subpart J. (Section 58.5(b)(2) of the Act)

 

SUBPART E: TIER 1 EVALUATION

 

Section 742.500
Tier 1 Evaluation Overview

 

a) A Tier 1 evaluation compares the concentration of each contaminant of concern detected at a site to the baseline remediation objectives provided in Appendix B, Tables A, B, C, D and E. Use of Tier 1 remediation objectives requires only limited site-specific information: concentrations of contaminants of concern, groundwater classification, land use classification, and, if appropriate, soil pH. (See Appendix B, Illustration A.)

 

b) Although Tier 1 allows for differentiation between residential and industrial/commercial property use of a site, an institutional control under Subpart J is required where remediation objectives are based on an industrial/commercial property use.

 

c) Any given exposure route is not a concern if the concentration of each contaminant of concern detected at the site is below the Tier 1 value of that given route. In such a case, no further evaluation of that route is necessary.

 

Section 742.505
Tier 1 Soil and Groundwater Remediation Objectives

 

a) Soil

 

1) Inhalation Exposure Route

 

A) The Tier 1 soil remediation objectives for this exposure route based upon residential property use are listed in Appendix B, Table A.

 

B) The Tier 1 soil remediation objectives for this exposure route based upon industrial/commercial property use are listed in Appendix B, Table B. Soil remediation objective determinations relying on this table require use of institutional controls in accordance with Subpart J.

 

2) Ingestion Exposure Route

 

A) The Tier 1 soil remediation objectives for this exposure route based upon residential property use are listed in Appendix B, Table A.

 

B) The Tier 1 soil remediation objectives for this exposure route based upon industrial/commercial property use are listed in Appendix B, Table B. Soil remediation objective determinations relying on this table require use of institutional controls in accordance with Subpart J.

 

3) Soil Component of the Groundwater Ingestion Route

 

A) The Tier 1 soil remediation objectives for this exposure route based upon residential property use are listed in Appendix B, Table A.

 

B) The Tier 1 soil remediation objectives for this exposure route based upon industrial/commercial property use are listed in Appendix B, Table B.

 

C) The pH-dependent Tier 1 soil remediation objectives for identified ionizable organics or inorganics for the soil component of the groundwater ingestion exposure route (based on the total amount of contaminants present in the soil sample results and groundwater classification) are provided in Appendix B, Tables C and D.

 

D) Values used to calculate the Tier 1 soil remediation objectives for this exposure route are listed in Appendix B, Table F.
4) Evaluation of the dermal contact with soil exposure route is not required under Tier 1.

 

b) Groundwater

 

1) The Tier 1 groundwater remediation objectives for the groundwater component of the groundwater ingestion route are listed in Appendix B, Table E.

 

2) The Tier 1 groundwater remediation objectives for this exposure route are given for Class I and Class II groundwaters, respectively.
3) The Class I groundwater remediation objectives set forth in Appendix B, Table E shall be corrected for cumulative effect of mixtures of similar-acting noncarcinogenic chemicals in accordance with the methodologies set forth in either subsection (b)(3)(A) or (B), if more than one chemical listed in Appendix A, Table E is detected at a site and if such chemicals affect the same target organ (i.e., has the same critical effect as defined by the RfD):

 

A) Calculate the weighted average using the following equations:

 

Wave =

 
where:
 

Wave= Weighted Average

 

x1 through xa = Concentration of each individual contaminant at the location of concern. Note that, depending on the target organ/mode of action, the actual number of contaminants will range from 2 to 14.

 

CUO x a = A Tier 1 remediation objective each xa from Appendix B, Table E.

 

ii) If the value of the weighted average calculated in accordance with the equations above is less than or equal to 1.0, then the remediation objectives are met for those chemicals.

 

ii) If the value of the weighted average calculated in accordance with the equations above is greater than 1.0, then additional remediation must be carried out until the level of contaminants remaining in the remediated area have a weighted average calculated in accordance with the equation above less than or equal to one;

 

B) Divide each individual chemical's remediation objective by the number of chemicals in that specific target organ group that were detected at the site. Each of the contaminant concentrations at the site is then compared to the remediation objectives that have been adjusted to account for this potential additivity.
 
Section 742.510
Tier 1 Remediation Objectives Tables

 

a) Soil remediation objectives are listed in Appendix B, Tables A, B, C and D.

 

1) Appendix B, Table A is based upon residential property use.

 

A) The first column to the right of the chemical name lists soil remediation objectives for the soil ingestion exposure route.

 

B) The second column lists the soil remediation objectives for the inhalation exposure route.

 

C) The third and fourth columns list soil remediation objectives for the soil component of the groundwater ingestion exposure route for the respective classes of groundwater:

 

i) Class I groundwater; and

 

ii) Class II groundwater.

 

D) The final column lists the Acceptable Detection Limit (ADL), only where applicable.

 

2) Appendix B, Table B is based upon industrial/commercial property use.

 

A) The first and third columns to the right of the chemical name list the soil remediation objectives for the soil ingestion exposure route based on two receptor populations:

 

i) Industrial/commercial; and

 

ii) Construction worker.

 

B) The second and fourth columns to the right of the chemical name list the soil remediation objectives for the inhalation exposure route based on two receptor populations:

 

i) Industrial/commercial; and

 

ii) Construction worker.

 

C) The fifth and sixth columns to the right of the chemical name list the soil remediation objectives for the soil component of the groundwater ingestion exposure route for two classes of groundwater:

 

i) Class I groundwater; and

 

ii) Class II groundwater.
 
3) Appendix B, Tables C and D set forth pH specific soil remediation objectives for inorganic and ionizing organic chemicals for the soil component of the groundwater ingestion route.
A) Table C sets forth remediation objectives based on Class I groundwater and Table D sets forth remediation objectives based on Class II groundwater.
 
 
B) The first column in Tables C and D lists the chemical names.
C) The second through ninth columns to the right of the chemical names list the pH based soil remediation objectives.

 

4) For the inorganic chemicals listed in Appendix B, Tables A and B, the soil component of the groundwater ingestion exposure route shall be evaluated using TCLP (SW-846 Method 1311) or SPLP (SW-846 Method 1312), incorporated by reference at Section 742.210 unless a person chooses to evaluate the soil component on the basis of the total amount of contaminant in a soil sample result in accordance with subsection (a)(5) of this Section.

 

5) For those inorganic and ionizing organic chemicals listed in Appendix B, Tables C and D, if a person elects to evaluate the soil component of the groundwater ingestion exposure route based on the total amount of contaminant in a soil sample result (rather than TCLP or SPLP analysis), the person shall determine the soil pH at the site and then select the appropriate soil remediation objectives based on Class I and Class II groundwaters from Tables C and D, respectively. If the soil pH is less than 4.5 or greater than 8.0, then Tables C and D cannot be used.

 

6) Unless one or more exposure routes are excluded from consideration under Subpart C, the most stringent soil remediation objective of the exposure routes (i.e., soil ingestion exposure route, inhalation exposure route, and soil component of the groundwater ingestion exposure route) shall be compared to the concentrations of soil contaminants of concern measured at the site. When using Appendix B, Table B to select soil remediation objectives for the ingestion exposure route and inhalation exposure route, the remediation objective shall be the more stringent soil remediation objective of the industrial/commercial populations and construction worker populations.

 

7) Confirmation sample results may be averaged or soil samples may be composited in accordance with Section 742.225.

 

8) If a soil remediation objective for a chemical is less than the ADL, the ADL shall serve as the soil remediation objective.

 

b) Groundwater remediation objectives for the groundwater component of the groundwater ingestion exposure route are listed in Appendix B, Table E. However, Appendix B, Table E must be corrected for cumulative effect of mixtures of similar-acting noncarcinogenic chemicals as set forth in Section 742.505(b)(3).

 

1) The first column to the right of the chemical name lists groundwater remediation objectives for Class I groundwater, and the second column lists the groundwater remediation objectives for Class II groundwater.

 

2) To use Appendix B, Table E of this Part, the 35 Ill. Adm. Code 620 classification for groundwater at the site shall be determined. The concentrations of groundwater contaminants of concern at the site are compared to the applicable Tier 1 groundwater remediation objectives for the groundwater component of the groundwater ingestion exposure route in Appendix B, Table E.

 

c) For contaminants of concern not listed in Appendix B, Tables A, B and E, a person may request site-specific remediation objectives from the Agency or propose site-specific remediation objectives in accordance with 35 Ill. Adm. Code 620, Subpart I of this Part, or both.

 

SUBPART F: TIER 2 GENERAL EVALUATION

 

Section 742.600
Tier 2 Evaluation Overview

 

a) Tier 2 remediation objectives are developed through the use of equations which allow site-specific data to be used. (See Appendix C, Illustrations A and B.) The equations, identified in Appendix C, Tables A and C may be used to develop Tier 2 remediation objectives.

 

b) Tier 2 evaluation is only required for contaminants of concern and corresponding exposure routes (except where excluded from further consideration under Subpart C) exceeding the Tier 1 remediation objectives. When conducting Tier 2 evaluations, the values used in the calculations must have the appropriate units of measure as identified in Appendix C, Tables B and D.

 

c) Any development of remediation objectives using site-specific information or equations outside the Tier 2 framework shall be evaluated under Tier 3.

 

d) Any development of a remediation objective under Tier 2 shall not use a target hazard quotient greater than one at the point of human exposure or a target cancer risk greater than 1 in 1,000,000 at the point of human exposure.

 

e) In conducting a Tier 2 evaluation, the following conditions shall be met:

 

1) For each discrete sample, the total soil contaminant concentration of either a single contaminant or multiple contaminants of concern shall not exceed the attenuation capacity of the soil as provided in Section 742.215.

 

2) Remediation objectives for noncarcinogenic compounds which affect the same target organ, organ system or similar mode of action shall meet the requirements of Section 742.720.

 

3) The soil remediation objectives based on the inhalation and the soil component of the groundwater ingestion exposure routes shall not exceed the soil saturation limit as provided in Section 742.220.

 

f) If the calculated Tier 2 soil remediation objective for an applicable exposure route is more stringent than the corresponding Tier 1 remediation objective, then the Tier 1 remediation objective applies.

 

g) If the calculated Tier 2 soil remediation objective for an exposure route is more stringent than the Tier 1 soil remediation objective(s) for the other exposure routes, then the Tier 2 calculated soil remediation objective applies and Tier 2 soil remediation objectives for the other exposure routes are not required.

 

h) If the calculated Tier 2 soil remediation objective is less stringent than one or more of the soil remediation objectives for the remaining exposure routes, then the Tier 2 values are calculated for the remaining exposure route(s) and the most stringent Tier 2 calculated value applies.

 
Section 742.605  Land Use
 

a) Present and post-remediation land use is evaluated in a Tier 2 evaluation. Acceptable exposure factors for the Tier 2 evaluation for residential, industrial/commercial, and construction worker populations are provided in the far right column of both Appendix C, Tables B and D. Use of exposure factors different from those in Appendix C, Tables B and D must be approved by the Agency as part of a Tier 3 evaluation.

 

b) If a Tier 2 evaluation is based on an industrial/commercial property use, then:

 

1) Construction worker populations shall also be evaluated; and

 

2) Institutional controls are required in accordance with Subpart J.
 

 

Section 742.610
Chemical and Site Properties

 

a) Physical and Chemical Properties of Contaminants

 
Tier 2 evaluations require information on the physical and chemical properties of the contaminants of concern. The physical and chemical properties used in a Tier 2 evaluation are contained in Appendix C, Table E. If the site has contaminants not included in this table, a person may request the Agency to provide the applicable physical and chemical input values or may propose input values under Subpart I. If a person proposes to apply values other than those in Appendix C, Table E, or those provided by the Agency, the evaluation shall be considered under Tier 3.
 

b) Soil and Groundwater Parameters

 

1) A Tier 2 evaluation requires examination of soil and groundwater parameters. The parameters that may be varied, and the conditions under which these parameters are determined as part of Tier 2, are summarized in Appendix C, Tables B and D. If a person proposes to vary site-specific parameters outside of the framework of these tables, the evaluation shall be considered under Tier 3.

 

2) To determine site-specific physical soil parameters, a minimum of one boring per 0.5 acre of contamination shall be collected. This boring must be deep enough to allow the collection of the required field measurements. The site-specific physical soil parameters must be determined from the portion of the boring representing the stratigraphic unit(s) being evaluated. For example, if evaluating the soil component of the groundwater ingestion exposure route, two samples from the boring will be required:

 

A) A sample of the predominant soil type for the vadose zone; and

 

B) A sample of the predominant soil type for the saturated zone.

 

3) A site-specific SSL dilution factor (used in developing soil remediation objectives based upon the protection of groundwater) may be determined by substituting site information in Equation S22 in Appendix C, Table A. To make this demonstration, a minimum of three monitoring wells shall be used to determine the hydraulic gradient. As an alternative, the default dilution factor value listed in Appendix C, Table B may be used. If monitoring wells are used to determine the hydraulic gradient, the soil taken from the borings shall be visually inspected to ensure there are no significant differences in the stratigraphy. If there are similar soil types in the field, one boring shall be used to determine the site-specific physical soil parameters. If there are significant differences, all of the borings shall be evaluated before determining the site-specific physical soil parameters for the site.

 

4) Not all of the parameters identified in Appendix C, Tables B and D need to be determined on a site-specific basis. A person may choose to collect partial site-specific information and use default values as listed in Appendix C, Tables B and D for the rest of the parameters.

 

SUBPART G: TIER 2 SOIL EVALUATION

 

Section 742.700
Tier 2 Soil Evaluation Overview

 

a) Tier 2 remediation objectives are developed through the use of models which allow site-specific data to be considered. Appendix C, Tables A and C list equations that shall be used under a Tier 2 evaluation to calculate soil remediation objectives prescribed by SSL and RBCA models, respectively. (See also Appendix C, Illustration A.)

 

b) Appendix C, Table A lists equations that are used under the SSL model. (See also Appendix C, Illustration A.) The SSL model has equations to evaluate the following human exposure routes:

 

1) Soil ingestion exposure route;

 

2) Inhalation exposure route for:

 

A) Volatiles;

 

B) Fugitive dust; and

 

3) Soil component of the groundwater ingestion exposure route.

 

c) Evaluation of the dermal exposure route is not required under the SSL model.

 

d) Appendix C, Table C lists equations that are used under the RBCA model. (See also Appendix C, Illustration A.) The RBCA model has equations to evaluate human exposure based on the following:

 

1) The combined exposure routes of inhalation of vapors and particulates, soil ingestion and dermal contact with soil;

 

2) The ambient vapor inhalation (outdoor) route from subsurface soils;

 

3) Soil component of the groundwater ingestion route; and

 

4) Groundwater ingestion exposure route.

 

e) The equations in either Appendix C, Table A or C may be used to calculate remediation objectives for each contaminant of concern under Tier 2, if the following requirements are met:

 

1) The Tier 2 soil remediation objectives for the ingestion and inhalation exposure routes shall use the applicable equations from the same approach (i.e., SSL equations in Appendix C, Table C).

 

2) The equations used to calculate soil remediation objectives for the soil component of the groundwater ingestion exposure route are not dependent on the approach utilized to calculate soil remediation objectives for the other exposure routes. For example, it is acceptable to use the SSL equations for calculating Tier 2 soil remediation objectives for the ingestion and inhalation exposure routes, and the RBCA equations for calculating Tier 2 soil remediation objectives for the soil component of the groundwater ingestion exposure route.

 

3) Combining equations from Appendix C, Tables A and C to form a new model is not allowed. In addition, Appendix C, Tables A and C must use their own applicable parameters identified in Appendix C, Tables B and D, respectively.

 

f) In calculating soil remediation objectives for industrial/commercial property use, applicable calculations shall be performed twice: once using industrial/commercial population default values and once using construction worker population default values. The more stringent soil remediation objectives derived from these calculations must be used for further Tier 2 evaluations.

 

g) Tier 2 data sheets provided by the Agency shall be used to present calculated Tier 2 remediation objectives, if required by the particular program for which remediation is being performed.

 

h) The RBCA equations which rely on the parameter Soil Water Sorption Coefficient (ks) can only be used for ionizing organics and inorganics by substituting values for ks from Appendix C, Tables I and J, respectively. This will also require the determination of a site-specific value for soil pH.

 

Section 742.705
Parameters for Soil Remediation Objective Equations

 

a) Appendix C, Tables B and D list the input parameters for the SSL and RBCA equations, respectively. The first column lists each symbol as it is presented in the equation. The next column defines the parameters. The third column shows the units for the parameters. The fourth column identifies where information on the parameters can be obtained (i.e., field measurement, applicable equation(s), reference source, or default value). The last column identifies how the parameters can be generated.

 

b) Default Values

 
Default values are numerical values specified for use in the Tier 2 equations. The fourth column of Appendix C, Tables B and D denotes if the default values are from the SSL model, RBCA model, or some other source. The last column of Appendix C, Tables B and D lists the numerical values for the default values used in the SSL and RBCA equations, respectively.
 

c) Site-specific Information

 
Site-specific information is a parameter measured, obtained, or determined from the site to calculate Tier 2 remediation objectives. The fourth column of Appendix C, Tables B and D identifies those site-specific parameters that may require direct field measurement. For some parameters, numerical default inputs have been provided in the last column of Appendix C, Tables B and D to substitute for site-specific information. In some cases, information on the receptor or soil type is required to select the applicable numerical default inputs. Site-specific information includes:
 

1) Physical soil parameters identified in Appendix C, Table F. The second column identifies the location where the sample is to be collected. Acceptable methods for measuring or calculating these soil parameters are identified in the last column of Appendix C, Table F;

 

2) Institutional controls or engineered barriers, pursuant to Subparts J and K, describe applicable institutional controls and engineered barriers under a Tier 2 evaluation; and

 

3) Land use classification

 

d) Toxicological-specific Information

 

1) Toxicological-specific information is used to calculate Tier 2 remediation objectives for the following parameters, if applicable:

 

A) Oral Chronic Reference Dose (RfDo, expressed in mg/kg-d);

 

B) Oral Subchronic Reference Dose (RfDs, expressed in mg/kg-d, shall be used for construction worker remediation objective calculations);

 

C) Oral Slope Factor (SFo, expressed in (mg/kg-d)-1);

 

D) Inhalation Unit Risk Factor (URF expressed in (m g/m3)-1);

 

E) Inhalation Chronic Reference Concentration (RfC, expressed in mg/m3);

 

F) Inhalation Subchronic Reference Concentration (RfCs, expressed in mg/m3, shall be used for construction worker remediation objective calculations);

 

G) Inhalation Chronic Reference Dose (RfDi, expressed in mg/kg-d);

 

H) Inhalation Subchronic Reference Dose (RfDis, expressed in mg/kg-d, shall be used for construction worker remediation objective calculations); and

 

I) Inhalation Slope Factor (SFi, expressed in (mg/kg-d)-1);

 

2) Toxicological information can be obtained from IRIS, as incorporated by reference in Section 742.210, or the program under which the remediation is being performed.

 

e) Chemical-specific Information

 
Chemical-specific information used to calculate Tier 2 remediation objectives is listed in Appendix C, Table E.
 

f) Calculations

 
Calculating numerical values for some parameters requires the use of equations listed in Appendix C, Table A or C.  The parameters that are calculated are listed in Appendix C, Tables B and D.
 

Section 742.710
SSL Soil Equations

 

a) This Section sets forth the equations and parameters used to develop Tier 2 soil remediation objectives for the three exposure routes using the SSL approach.

 

b) Soil Ingestion Exposure Route

 

1) Equations S1 through S3 form the basis for calculating Tier 2 remediation objectives for the soil ingestion exposure route using the SSL approach. Equation S1 is used to calculate soil remediation objectives for noncarcinogenic contaminants. Equations S2 and S3 are used to calculate soil remediation objectives for carcinogenic contaminants for residential populations and industrial/commercial and construction worker populations, respectively.

 

2) For Equations S1 through S3, the SSL default values cannot be modified with site-specific information.

 

c) Inhalation Exposure Route

 

1) Equations S4 through S16, S26 and S27 are used to calculate Tier 2 soil remediation objectives for the inhalation exposure route using the SSL approach. To address this exposure route, volatiles must be evaluated separately from fugitive dust using their own equations set forth in subsections (c)(2) and (c)(3) of this Section, respectively.

 

2) Volatiles

 

A) Equations S4 through S10 are used to calculate Tier 2 soil remediation objectives for volatile contaminants based on the inhalation exposure route. Equation S4 is used to calculate soil remediation objectives for noncarcinogenic volatile contaminants in soil for residential and industrial/commercial populations. Equation S5 is used to calculate soil remediation objectives for noncarcinogenic volatile contaminants in soil for construction worker populations. Equation S6 is used to calculate soil remediation objectives for carcinogenic volatile contaminants in soil for residential and industrial/commercial populations. Equation S7 is used to calculate soil remediation objectives for carcinogenic volatile contaminants in soil for construction worker populations. Equations S8 through S10, S27 and S28 are used for calculating numerical values for some of the parameters in Equations S4 through S7.

 

B) For Equation S4, a numerical value for the Volatilization Factor (VF) can be calculated in accordance with subsection (c)(2)(F) of this Section. The remaining parameters in Equation S4 have either SSL default values listed in Appendix C, Table B or toxicological-specific information (i.e., RfC), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

C) For Equation S5, a numerical value for the Volatilization Factor adjusted for Agitation (VF') can be calculated in accordance with subsection (c)(2)(G) of this Section. The remaining parameters in Equation S5 have either SSL default values listed in Appendix C, Table B or toxicological-specific information (i.e., RfC), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

D) For Equation S6, a numerical value for VF can be calculated in accordance with subsection (c)(2)(F) of this Section. The remaining parameters in Equation S6 have either default values listed in Appendix C, Table B or toxicological-specific information (i.e., URF), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

E) For Equation S7, a numerical value for VF' can be calculated in accordance with subsection (c)(2)(G) of this Section. The remaining parameters in Equation S7 have either default values listed in Appendix C, Table B or toxicological-specific information (i.e., URF), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

F) The VF can be calculated for residential and industrial/commercial populations using one of the following equations based on the information known about the contaminant source and receptor population:

 

i) Equation S8, in conjunction with Equation S10, is used to calculate VF assuming an infinite source of contamination; or

 

ii) If the area and depth of the contaminant source are known or can be estimated reliably, mass limit considerations may be used to calculate VF using Equation S26.

 

G) The VF' can be calculated for the construction worker populations using one of the following equations based on the information known about the contaminant source:

 

i) Equation S9 is used to calculate VF' assuming an infinite source of contamination; or

 

ii) If the area and depth of the contaminant source are known or can be estimated reliably, mass limit considerations may be used to calculate VF' using Equation S27.

 

3) Fugitive Dust

 

A) Equations S11 through S16 are used to calculate Tier 2 soil remediation objectives using the SSL fugitive dust model for the inhalation exposure route. Equation S11 is used to calculate soil remediation objectives for noncarcinogenic contaminants in fugitive dust for residential and industrial/commercial populations. Equation S12 is used to calculate soil remediation objectives for noncarcinogenic contaminants in fugitive dust for construction worker populations. Equation S13 is used to calculate soil remediation objectives for carcinogenic contaminants in fugitive dust for residential and industrial/commercial populations. Equation S14 is used to calculate soil remediation objectives for carcinogenic contaminants in fugitive dust for construction worker populations. Equations S15 and S16 are used for calculating numerical quantities for some of the parameters in Equations S11 through S14.

 

B) For Equation S11, a numerical value can be calculated for the Particulate Emission Factor (PEF) using Equation S15. This equation relies on various input parameters from a variety of sources. The remaining parameters in Equation S11 have either SSL default values listed in Appendix C, Table B or toxicological-specific information (i.e., RfC), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

C) For Equation S12, a numerical value for the Particulate Emission Factor for Construction Worker (PEF') can be calculated using Equation S16. The remaining parameters in Equation S12 have either SSL default values listed in Appendix C, Table B or toxicological-specific information (i.e., RfC), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

D) For Equation S13, a numerical value for PEF can be calculated using Equation S15. The remaining parameters in Equation S13 have either default values listed in Appendix C, Table B or toxicological-specific information (i.e., URF), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

E) For Equation S14, a numerical value for PEF' can be calculated using Equation S16. The remaining parameters in Equation S14 have either default values listed in Appendix C, Table B or toxicological-specific information (i.e., URF), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

d) Soil Component of the Groundwater Ingestion Exposure Route

 
The Tier 2 remediation objective for the soil component of the groundwater ingestion exposure route can be calculated using one of the following equations based on the information known about the contaminant source and receptor population:
 

1) Equation S17 is used to calculate the remediation objective assuming an infinite source of contamination.

 

A) The numerical quantities for four parameters in Equation S17, the Target Soil Leachate Concentration (Cw), Soil-Water Partition Coefficient (Kd) for non-ionizing organics, Water-Filled Soil Porosity (q w) and Air-Filled Soil Porosity ( q a), are calculated using Equations S18, S19, S20 and S21, respectively. Equations S22, S23, S24 and S25 are also needed to calculate numerical values for Equations S18 and S21. The pH-dependent Kd values for ionizing organics can be calculated using Equation S19 and the pH-dependent Koc values in Appendix C, Table I.

 

B) The remaining parameters in Equation S17 are Henry's Law Constant (H'), a chemical specific value listed in Appendix C, Table E and Dry Soil Bulk Density (r b), a site-specific based value listed in Appendix C, Table B.

 

C) The default value for GWobj is the Tier 1 groundwater objective. For chemicals for which there is no Tier 1 groundwater remediation objective, the value for GWobj shall be the Health Advisory concentration determined according to the procedures specified in 35 Ill. Adm. Code 620, Subpart F. As an alternative to using Tier 1 groundwater remediation objectives or Health Advisory concentrations, GWobj may be developed using Equations R25 and R26, if approved institutional controls are in place as required in Subpart J 

 

2) If the area and depth of the contaminant source are known or can be estimated reliably, mass limit considerations may be used to calculate the remediation objective for this exposure route using Equation S28. The parameters in Equation S28 have default values listed in Appendix C, Table B.

 

Section 742.715
RBCA Soil Equations

 

a) This Section presents the RBCA model and describes the equations and parameters used to develop Tier 2 soil remediation objectives.

 

b) Ingestion, Inhalation, and Dermal Contact

 

1) The two sets of equations in subsections (b)(2) and (b)(3) of this Section shall be used to generate Tier 2 soil remediation objectives for the combined ingestion, inhalation, and dermal contact with soil exposure routes.

 

2) Combined Exposure Routes of Soil Ingestion, Inhalation of Vapors and Particulates, and Dermal Contact with Soil

 

A) Equations R1 and R2 form the basis for deriving Tier 2 remediation objectives for the set of equations that evaluates the combined exposure routes of soil ingestion, inhalation of vapors and particulates, and dermal contact with soil using the RBCA approach. Equation R1 is used to calculate soil remediation objectives for carcinogenic contaminants. Equation R2 is used to calculate soil remediation objectives for noncarcinogenic contaminants. Soil remediation objectives for the ambient vapor inhalation (outdoor) route from subsurface soils must also be calculated in accordance with the procedures outlined in subsection (b)(3) of this Section and compared to the values generated from Equations R1 or R2. The smaller value (i.e., R1 and R2 compared to R7 and R8, respectively) from these calculations is the Tier 2 soil remediation objective for the combined exposure routes of soil ingestion, inhalation, and dermal contact with soil.

 

B) In Equation R1, numerical values are calculated for two parameters:

 

i) The volatilization factor for surficial soils (VFss) using Equations R3 and R4; and

 

ii) The volatilization factor for subsurface soils regarding particulates (VFp) using Equation R5.

 

C) VFss uses Equations R3 and R4 to derive a numerical value. Equation R3 requires the use of Equation R6. Both equations must be used to calculate the VFss. The lowest calculated value from these equations must be substituted into Equation R1.

 

D) The remaining parameters in Equation R1 have either default values listed in Appendix C, Table D or toxicological-specific information (i.e., SFo, SFi), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

E) For Equation R2, the parameters VFss and VFp are calculated. The remaining parameters in Equation R2 have either default values listed in Appendix C, Table D or toxicological-specific information (i.e., RfDo, RfDi), which can be obtained from IRIS or requested from the program under which the remediation is being performed.

 

F) For chemicals other than inorganics which do not have default values for the dermal absorption factor (RAFd) in Appendix C, Table D, a dermal absorption factor of 0.5 shall be used for Equations R1 and R2. For inorganics, dermal absorption may be disregarded (i.e., RAFd=0).

 

3) Ambient Vapor Inhalation (outdoor) route from Subsurface Soils (soil below one meter)

 

A) Equations R7 and R8 form the basis for deriving Tier 2 remediation objectives for the ambient vapor inhalation (outdoor) route from subsurface soils using the RBCA approach. Equation R7 is used to calculate soil remediation objectives for carcinogenic contaminants. Equation R8 is used to calculate soil remediation objectives for noncarcinogenic contaminants.

 

B) For Equation R7, the carcinogenic risk-based screening level for air (RBSLair) and the volatilization factor for soils below one meter to ambient air (VFsamb) have numerical values that are calculated using Equations R9 and R11, respectively. Both equations rely on input parameters from a variety of sources.

 

C) The noncarcinogenic risk-based screening level for air (RBSLair) and the volatilization factor for soils below one meter to ambient air (VFsamb) in Equation R8 have numerical values that can be calculated using Equations R10 and R11, respectively.

 

c) Soil Component of the Groundwater Ingestion Exposure Route

 

1) Equation R12 forms the basis for deriving Tier 2 remediation objectives for the soil component of the groundwater ingestion exposure route using the RBCA approach. The parameters, groundwater at the source (GWsource), and Leaching Factor (LFsw), have numerical values that are calculated using Equations R13 and R14, respectively.

 

2) Equation R13 requires numerical values that are calculated using Equation R15.

 

3) Equation R14 requires numerical values that are calculated using Equations R21, R22, and R24. For non-ionizing organics, the Soil Water Sorption Coefficient (ks) shall be calculated using Equation R20. For ionizing organics and inorganics, the values for ks are listed in Appendix C, Tables I and J, respectively. The pH-dependent ks values for ionizing organics can be calculated using Equation R20 and the pH-dependent Koc values in Appendix C, Table I. The remaining parameters in Equation R14 are field measurements or default values listed in Appendix C, Table D.

 

d) The default value for GWcomp is the Tier 1 groundwater remediation objective. For chemicals for which there is no Tier 1 groundwater remediation objective, the value for GWcomp shall be the Health Advisory concentration determined according to the procedures specified in 35 Ill. Adm. Code 620, Subpart F. As an alternative to using the Tier 1 groundwater remediation objectives or Health Advisory concentrations, GWcomp may be developed using Equations R25 and R26, if approved institutional controls are in place as may be required in Subpart J.
Section 742.720
Chemicals with Cumulative Noncarcinogenic Effects

 
Appendix A, Table E lists the groups of chemicals from Appendix B, Tables A and B that have remediation objectives based on noncarcinogenic toxicity and that affect the same target organ. If more than one chemical detected at a site affects the same target organ (i.e., has the same critical effect as defined by the RfD), the initially calculated remediation value for each chemical in the group shall be corrected for cumulative effects by one of the following two methods:
 

a) Calculate the weighted average using the following equations:

 
 Wave =
 
where:
 
 Wave= Weighted Average
 

x1 through xa = Concentration of each individual contaminant at the location of concern. Note that, depending on the target organ/mode of action, the actual number of contaminants will range from 2 to 14.

 

CUO x a = A Tier 2 remediation objective must be developed for each xa.

 
If the value of the weighted average calculated in accordance with the equations above is less than or equal to 1.0, then the remediation objectives are met for those chemicals.
 
If the value of the weighted average calculated in accordance with the equations above is greater than 1.0, then additional remediation must be carried out until the level of contaminants remaining in the remediated area has a weighted average calculated in accordance with the equation above less than or equal to one.
 

b) Divide each individual chemical's remediation objective by the number of chemicals in that specific target organ group that were detected at the site. Each of the contaminant concentrations at the site is then compared to the remediation objectives that have been adjusted to account for this potential additivity. For the noncarcinogenic contaminants listed in Appendix A, Table E, a respective soil remediation objective need be no lower than the respective value listed in Appendix B, Table A or B.

 

SUBPART H: TIER 2 GROUNDWATER EVALUATION   

 

Section 742.800
Tier 2 Groundwater Evaluation Overview

 
If the contaminant concentrations in the groundwater exceed the applicable Tier 1 remediation objectives, a person has the following options:
 

a) Demonstrate that the groundwater ingestion exposure route is excluded from consideration pursuant to Subpart C;

 

b) Demonstrate that the groundwater contamination is at or below area background concentrations in accordance with Subpart D and, if necessary, an institutional control restricting usage of the groundwater is in place in accordance with Subpart J;

 

c) Remediate to Tier 1 remediation objectives;

 

d) Propose and obtain approval of Tier 2 groundwater remediation objectives in accordance with Section 742.805 and remediate to that level, if necessary;

 

e) Conduct a Tier 3 evaluation in accordance with Subpart I; or

 

f) Obtain approval from the Board to:

 

1) Reclassify the groundwater pursuant to 35 Ill. Adm. Code 620.260; or

 

2) Use an adjusted standard pursuant to Section 28.1 of the Act. [415 ILCS 5/28.1].

 

Section 742.805
Tier 2 Groundwater Remediation Objectives

 

a) To develop a groundwater remediation objective under this Section that exceeds the applicable Tier 1 groundwater remediation objective, a person may request approval from the Agency if the person has performed the following:

 

1) Identified the horizontal and vertical extent of groundwater for which the Tier 2 groundwater remediation objective is sought;

 

2) Taken corrective action, to the maximum extent practicable to remove any free product;

 

3) Using Equation R26 in accordance with Section 742.810, demonstrated that the concentration of any contaminant of concern in groundwater will meet:

 

A) The applicable Tier 1 groundwater remediation objective at the point of human exposure; or

 

B) For any contaminant of concern for which there is no Tier 1 groundwater remediation objective, the Health Advisory concentration determined according to the procedures specified in 35 Ill. Adm. Code 620, Subpart F at the point of human exposure. A person may request the Agency to provide these concentrations or may propose these concentrations under Subpart I;.

 

4) Using Equation R26 in accordance with Section 742.810, demonstrated that the concentration of any contaminant of concern in groundwater within the minimum or designated maximum setback zone of an existing potable water supply well will meet the applicable Tier 1 groundwater remediation objective or if there is no Tier 1 groundwater remediation objective, the Health Advisory concentration;

 

5) Using Equation R26 in accordance with Section 742.810, demonstrated that the concentration of any contaminant of concern in groundwater discharging into a surface water will meet the applicable water quality standard under 35 Ill. Adm. Code 302;

 

6) Demonstrated that the source of the release is not located within the minimum or designated maximum setback zone or within a regulated recharge area of an existing potable water supply well; and

 

7) If the selected corrective action includes an engineered barrier as set forth in Subpart K to minimize migration of contaminant of concern from the soil to the groundwater, demonstrated that the engineered barrier will remain in place for post-remediation land use through an institutional control as set forth in Subpart J.

 

b) A groundwater remediation objective that exceeds the water solubility of that chemical (refer to Appendix C, Table E for solubility values) is not allowed. 
c) Groundwater remediation objectives for chemicals which affect the same target organ, organ system or similar mode of action shall meet the requirements of Section 742.505(b)(3). Contaminants of concern for which a Tier 1 remediation objective has been developed shall be included in any mixture of similar-acting substances under consideration in Tier 2.
Section 742.810
Calculations to Predict Impacts from Remaining Groundwater Contamination

 

a) Equation R26 predicts the contaminant concentration along the centerline of a plume emanating from a vertical planar source in the aquifer (dimensions Sw wide and Sd deep). This model accounts for both three-dimensional dispersion (x is the direction of groundwater flow, y is the other horizontal direction, and z is the vertical direction) and biodegradation.

 

1) The parameters in this equation are:

 

X = distance from the planar source to the location of concern, along the centerline of the plume (i.e., y=0, z=0)

 

Cx = the concentration of the contaminant at a distance X from the source, along the centerline of the plume

 

 
Csource= the greatest potential concentration of the contaminant of concern in the groundwater at the source of the contamination, based on the concentrations of contaminants in groundwater due to the release and the projected concentration of the contaminant migrating from the soil to the groundwater. As indicated above, the model assumes a planar source discharging groundwater at a concentration equal to Csource
a x = dispersivity in the x direction (i.e., Equation R16)

 

a y = dispersivity in the y direction (i.e., Equation R17)

 

a z = dispersivity in the z direction (i.e., Equation R18)
U = specific discharge (i.e., actual groundwater flow velocity through a porous medium; takes into account the fact that the groundwater actually flows only through the pores of the subsurface materials) where the aquifer hydraulic conductivity (K), the hydraulic gradient (I) and the total soil porosity (q T) must be known (i.e., Equation R19)
 
 
l = first order degradation constant obtained from Appendix C, Table E or from measured groundwater data
Sw = width of planar source in the y direction
 
Sd = depth of planar source in the z direction
 
2) The following parameters are determined through field measurements: U, K, I, q T, Sw, Sd.

 

A) The determination of values for U, K, I and q T can be obtained through the appropriate laboratory and field techniques;

 

B) From the immediate down-gradient edge of the source of the groundwater contamination values for Sw and Sd shall be determined. Sw is defined as the width of groundwater at the source which exceeds the Tier 1 groundwater remediation objective. Sd is defined as the depth of groundwater at the source which exceeds the Tier 1 groundwater remediation objective; and

 

C) Total soil porosity can also be calculated using Equation R23.

 

b) Once values are obtained for all the input parameters identified in subsection (a) of this Section, the contaminant concentration along the centerline of the plume at a distance X from the source shall be calculated such that that distance from the down-gradient edge of the source of the contamination at the site to the point where the contaminant concentration is equal to the Tier 1 groundwater remediation objective or Health Advisory concentration.

 

1) If there are any potable water supply wells located within the calculated distance X, then the Tier 1 groundwater remediation objective or Health Advisory concentration shall be met at the edge of the minimum or designated maximum setback zone of the nearest potable water supply well down-gradient of the source. If no potable water supply wells exist within the calculated distance X, then it can be determined that no existing potable water supply wells are adversely impacted.

 

2) To demonstrate that no surface water is adversely impacted, X shall be the distance from the down-gradient edge of the source of the contamination at the site to the nearest surface water body. This calculation must show that the contaminant in the groundwater at this location (Cx) does not exceed the applicable water quality standard.

 

SUBPART I: TIER 3 EVALUATION

 

Section 742.900
Tier 3 Evaluation Overview

 

a) Tier 3 sets forth a flexible framework to develop remediation objectives outside of the requirements of Tiers 1 and 2. Although Tier 1 and Tier 2 evaluations are not prerequisites to conduct Tier 3 evaluations, data from Tier 1 and Tier 2 can assist in developing remediation objectives under a Tier 3 evaluation.

 

b) The level of detail required to adequately characterize a site depends on the particular use of Tier 3. Tier 3 can require additional investigative efforts beyond those described in Tier 2 to characterize the physical setting of the site. However, in situations where remedial efforts have simply reached a physical obstruction additional investigation may not be necessary for a Tier 3 submittal.

 

c) Situations that can be considered for a Tier 3 evaluation include, but are not limited to:

 

1) Modification of parameters not allowed under Tier 2;

 

2) Use of models different from those used in Tier 2;

 

3) Use of additional site data to improve or confirm predictions of exposed receptors to contaminants of concern;

 

4) Analysis of site-specific risks using formal risk assessment, probabilistic data analysis, and sophisticated fate and transport models (e.g., requesting a target hazard quotient greater than 1 or a target cancer risk greater than 1 in 1,000,000);

 

5) Requests for site-specific remediation objectives because an assessment indicates further remediation is not practical;

 

6) Incomplete human exposure pathway(s) not excluded under Subpart C;

 

7) Use of toxicological-specific information not available from the sources listed in Tier 2;
8) Land uses which are substantially different from the assumed residential or industrial/commercial property uses of a site (e.g., a s site will be used for recreation in the future and cannot be evaluated in Tiers 1 or 2); and
9) Requests for site-specific remediation objectives which exceed Tier 1 groundwater remediation objectives so long as the following is demonstrated:

 

    1. TO THE EXTENT PRACTICAL, THE EXCEEDANCE OF THE GROUNDWATER QUALITY STANDARD HAS BEEN MINIMIZED AND BENEFICIAL USE APPROPRIATE TO THE GROUNDWATER THAT WAS IMPACTED HAS BEEN RETURNED; AND
  1. ANY THREAT TO HUMAN HEALTH OR THE ENVIRONMENT HAS BEEN MINIMIZED. (Section 58.5(D)(4)(A) of the Act)
    2. d) For requests of a target cancer risk ranging between 1 in 1,000,000 and 1 in 10,000 at the point of human exposure or a target hazard quotient greater than 1 at the point of human exposure, the requirements of Section 742.915 shall be followed. Requests for a target cancer risk exceeding 1 in 10,000 at the point of human exposure are not allowed.

     

    e) Requests for approval of a Tier 3 evaluation must be submitted to the Agency for review under the specific program under which remediation is performed. When reviewing a submittal under Tier 3, the Agency shall consider WHETHER THE INTERPRETATIONS AND CONCLUSIONS REACHED ARE SUPPORTED BY THE INFORMATION GATHERED. (Section 58.7(e)(1) of the Act) The Agency shall approve a Tier 3 evaluation if the person submits the information required under this Part and establishes through such information that public health is protected and that specified risks to human health and the environment have been minimized.

     
    Section 742.905  Modifications of Parameters
     
    Any proposed changes to Tier 2 parameters which are not provided for in Tier 2 shall be submitted to the Agency for review and approval. A submittal under this Section shall include the following information:
     

    a) The justification for the modification; and

     

    b) The technical and mathematical basis for the modification.

     

    Section 742.910
    Alternative Models

     
    Any proposals for the use of models other than those specified in Tier 2 shall be submitted to the Agency for review and approval. A submittal under this Section shall include the following information:
     

    a) Physical and chemical properties of contaminants of concern;

     

    b) Contaminant movement properties;

     

    c) Contaminant availability to receptors;

     

    d) Receptor exposure to the contaminants of concern;

     

    e) Mathematical and technical justification for the model proposed;

     

    f) A licensed copy of the model, if the Agency does not have a licensed copy of the model currently available for use; and

     

    g) Demonstration that the models were correctly applied.

     
     
    Section 742.915  Formal Risk Assessments
     
    A comprehensive site-specific risk assessment shall demonstrate that contaminants of concern at a site do not pose a significant risk to any human receptor. All site-specific risk assessments shall be submitted to the Agency for review and approval. A submittal under this Section shall address the following factors:
     

    a) Whether the risk assessment procedure used is nationally recognized and accepted including, but not limited to, those procedures incorporated by reference in Section 742.210;

     

    b) Whether the site-specific data reflects actual site conditions;

     

    c) The adequacy of the investigation of present and post-remediation exposure routes and risks to receptors identified at the site;

     

    d) The appropriateness of the sampling and analysis;

     

    e) The adequacy and appropriateness of toxicity information;

     

     
    f) The extent of contamination;
    g) Whether the calculations were accurately performed; and

     

    h) Proposals seeking to modify the target risk consistent with Section 742.900(d) shall address the following factors:
    1)the presence of sensitive populations;
    2)the number of receptors potentially impacted;
    3)the duration of risk at the differing target levels; and
    4)the characteristics of the chemical of concern.

    Section 742.920  Impractical Remediation
     
    Any request for site-specific remediation objectives due to impracticality of remediation shall be submitted to the Agency for review and approval. A submittal under this Section shall include the following information:
     

    a) The reason(s) why the remediation is impractical;

     

    b) The extent of contamination;

     

    c) Geology, including soil types;

     

    d) The potential impact to groundwater;

     

    e) Results and locations of sampling events;

     

    f) Map of the area, including all utilities and structures; and

     

    g) Present and post-remediation uses of the area of contamination, including human receptors at risk.

     
    Section 742.925  Exposure Routes
     
    Technical information may demonstrate that there is no actual or potential impact of contaminants of concern to receptors from a particular exposure route. In these instances, a demonstration excluding an exposure route shall be submitted to the Agency for review and approval. A submittal under this Section shall include the following information:
     

    a) A description of the route evaluated;

     

    b) Technical support including a discussion of the natural or man-made barriers to exposure through that route, calculations, and modeling results;

     

    c) Physical and chemical properties of contaminants of concern;

     

    d) Contaminant migration properties;

     

    e) Description of the site and physical site characteristics; and

     

    f) Discussion of the result and possibility of the route becoming active in the future.

     

    Section 742.930
    Derivation of Toxicological Data

     
    If toxicological-specific information is not available for one or more contaminants of concern from the sources incorporated by reference in Section 742.210, the derivations of toxicological-specific information shall be submitted for Agency review and approval.

     
    SUBPART J: INSTITUTIONAL CONTROLS

    Section 742.1000  Institutional Controls
     

    a) Institutional controls in accordance with this Subpart must be placed on the property when remediation objectives are based on any of the following assumptions:

     

    1) Industrial/Commercial property use;

     

    2) Target cancer risk greater than 1 in 1,000,000;

     

    3) Target hazard quotient greater than 1;

     

    4) Engineered barrier(s);

     

    5) The point of human exposure is located at a place other than at the source;

     

    6) Exclusion of exposure routes under Subpart C; or

     

    7) Any combination of the above.

     

    b) The Agency shall not approve any remediation objective under this Part that is based on the use of institutional controls unless the person has proposed institutional controls meeting the requirements of this Subpart and the requirements of the specific program under which the institutional control is proposed. A proposal for approval of institutional controls shall provide identification of the selected institutional controls from among the types recognized in this Subpart.

     

    c) The following instruments may be institutional controls, subject to the requirements of this Subpart J and the requirements of the specific program under which the institutional control is proposed:

     

    1) No Further Remediation Letters;

     

    2) Restrictive covenants and deed restrictions;

     

    3) Negative easements;

     

    4) Ordinances adopted and administered by a unit of local government; and

     

    5) Agreements between a property owner and a highway authority with respect to any contamination remaining under highways.

     

    d) An institutional control is transferred with the property.
    Section 742.1005
    No Further Remediation Letters

     

    a) A No Further Remediation Letter issued by the Agency under 35 Ill. Adm. Code 732 or 742 may be used as an institutional control under this Part if the requirements of subsection (b) of this Section are met.

     

    b) A request for approval of a No Further Remediation Letter as an institutional control shall meet the requirements applicable to the specific program under which the remediation is performed.
     
    Section 742.1010
    Restrictive Covenants, Deed Restrictions and Negative Easements

     

    a) A restrictive covenant, deed restriction or negative easement may be used as an institutional control under this Part if the requirements of this Section are met and the Agency has determined that no further remediation is required as to the property(ies) to which the institutional control is to apply.

     

    b) A request for approval of a restrictive covenant, deed restriction or negative easement as an acceptable institutional control shall provide the following:

     

    1) A copy of the restrictive covenant, deed restriction, or negative easement in the form it will be recorded with the Office of the Recorder or Registrar of Titles in the county where the site is located;

     

    2) A scaled map showing the horizontal extent of contamination above the applicable remediation objectives;

     

    3) Information showing the concentration of contaminants of concern in which the applicable remediation objectives are exceeded;

     

    4) A scaled map showing the legal boundaries of all properties under which contamination is located that exceeds the applicable remediation objectives and which are subject to the restrictive covenant, deed restriction, or negative;

     

    5) Information identifying the current owner(s) of each property identified in subsection (b)(4) of this Section; and

     

    6) Authorization by the current owner(s), or person authorized by law to act on behalf of the owner, of each property identified in subsection (b)(5) of this Section to record the restrictive covenant or deed restriction.

     

    c) Any restrictive covenant, deed restriction, or negative easement approved by the Agency pursuant to this Section shall be recorded in the Office of the Recorder or Registrar of Titles of the county in which the site is located together with the instrument memorializing the Agency’s no further remediation determination pursuant to the specific program within 45 days after receipt of the Agency’s no further remediation determination.

     

    d) An institutional control approved under this Section shall not become effective until officially recorded in accordance with subsection (c) of this Section. The person receiving the approval shall obtain and submit to the Agency within 30 days after recording a copy of the institutional control demonstrating that it has been recorded.

     

    e) At no time shall any site for which land use has been restricted under an institutional control approved under this Section be used in a manner inconsistent with such land use limitation unless further investigation or remedial action has been conducted that documents the attainment of remediation objectives appropriate for such land use and a new institutional control, if necessary, is approved and recorded in accordance with subsection (c) of this Section.

     

    f) Violation of the terms of an institutional control approved under this Section shall be grounds for voidance of the institutional control and the instrument memorializing the Agency's no further remediation determination.

    Section 742.1015  Ordinances
     

    a) An ordinance adopted by a unit of local government that effectively prohibits the installation of potable water supply wells (and the use of such wells) may be used as an institutional control to meet the requirements of Section 742.320(d) or 742.805(a)(3) if the requirements of this Section are met. Ordinances prohibiting the installation of potable water supply wells (and the use of such wells) that do not expressly prohibit the installation of potable water supply wells (and the use of such wells) by units of local government may be acceptable as institutional controls if the requirements of this Section are met and a Memorandum of Understanding (MOU) is entered into under subsection (i) of this Section.

     

    b) A request for approval of a local ordinance as an institutional control shall provide the following:

     

    1) A copy of the ordinance restricting groundwater use certified by an official of the unit of local government in which the site is located that it is the latest, most current copy of the ordinance, unless the Agency and the unit of local government have entered an agreement under subsection (i) of this Section, in which case the request may alternatively reference the MOU. The ordinance must demonstrate that potable use of groundwater from potable water supply wells is prohibited;

     

    2) A scaled map(s) delineating the areal extent of groundwater contamination (measured or modeled) above the applicable remediation objectives;

     

    3) Information showing the concentration of contaminants of concern in which the applicable remediation objectives are exceeded;

     

    4) A scaled map delineating the boundaries of all properties under which groundwater is located which exceeds the applicable groundwater remediation objectives;

     

    5) Information identifying the current owner(s) of each property identified in subsection (b)(4) of this Section; and

     

    6) A copy of the proposed submission of the information to the current owners identified in subsection (b)(5) of this Section of the information required in subsections (b)(1) through (b)(5) of this Section and proof that the notification required in subsection (c) of this Section has been submitted.

     

    c) Each of the property owners identified in subsection (b)(5) of this Section and the unit of local government must receive written notification from the party desiring to use the institutional control that groundwater remediation objectives have been approved by the Agency. Written proof of this notification shall be submitted to the Agency within 45 days from the date of the instrument memorializing the Agency’s no further remediation determination. The notification shall include:

     

    1) The name and address of the unit of local government;

     

    2) The citation to the ordinance;

     

    3) A description of the property being sent notice by adequate legal description or by reference to a plat showing the boundaries;

     

    4) A statement that the ordinance restricting groundwater use has been used by the Agency in reviewing a request for a groundwater remediation objective;

     

    5) A statement as to the nature of the release and response action with the site name, address, and Agency site number or Illinois inventory identification number; and

     

    6) A statement as to where more information may be obtained regarding the ordinance.

     

    d) Unless the Agency and the unit of local government have entered into a MOU under subsection (i) of this Section, the current owner or successors in interest of a site who have received approval of use of an ordinance as an institutional control under this Section shall:

     

    1) Monitor activities of the unit of local government relative to variance requests or changes in the ordinance relative to the use of potable groundwater at properties identified in subsection (b)(4) of this Section; and

     

    2) Notify the Agency of any approved variance requests or ordinance changes within 30 days after the date such action has been approved.

     

    e) The information required in subsections (b)(1) through (b)(6) of this Section and the Agency letter approving the groundwater remediation objective shall be submitted to the unit of local government. Proof that the information has been filed with the unit of local government shall be provided to the Agency.

     

    f) Any ordinance or MOU used as an institutional control pursuant to this Section shall be recorded in the Office of the Recorder or Registrar of Titles of the county in which the site is located together with the instrument memorializing the Agency’s no further remediation determination pursuant to the specific program within 45 days after receipt of the Agency’s no further remediation.

     

    g) An institutional control approved under this Section shall not become effective until officially recorded in accordance with subsection (f) of this Section. The person receiving the approval shall obtain and submit to the Agency within 30 days after recording a copy of the institutional control demonstrating that it has been recorded.

     

    h) The following shall be grounds for voidance of the ordinance as an institutional control and the instrument memorializing the Agency's no further remediation determination:

     

    1) Modification of the ordinance by the unit of local government to allow potable use of groundwater;

     

    2) Approval of a site-specific request, such as a variance, to allow potable use of groundwater at a site identified in subsection (b)(4) of this Section; or

     

    3) Violation of the terms of an institutional control recorded under Section 742.1005 or Section 742.1010.

     

    i) The Agency and a unit of local government may enter into a MOU under this Section if the unit of local government has adopted an ordinance satisfying subsection (a) of this Section and if the requirements of this subsection are met. The MOU shall include the following:

     

    1) Identification of the authority of the unit of local government to enter the MOU;

     

    2) Identification of the legal boundaries, or equivalent, under which the ordinance is applicable;

     

    3) A certified copy of the ordinance;

     

     
    4) A commitment by the unit of local government to notify the Agency of any variance requests or proposed ordinance changes at least 30 days prior to the date the local government is scheduled to take action on the request or proposed change;
    5) A commitment by the unit of local government to maintain a registry of all sites within the unit of local government that have received no further remediation determinations pursuant to specific programs and

     

    6) If the ordinance does not expressly prohibit the installation of potable water supply wells (and the use of such wells) by units of local government, a commitment by the unit of local government:

     

    A) To review the registry of sites established under subsection (i)(5) of this Section prior to siting potable water supply wells within the area covered by the ordinance;

     

    B) To determine whether the potential source of potable water may be or has been affected by contamination left in place at those sites; and

     

    C) To take whatever steps are necessary to ensure that the potential source of potable water is protected from the contamination or treated before it is used as a potable water supply.

     

    Section 742.1020
    Highway Authority Agreements

     

    a) An agreement with a highway authority may be used as an institutional control where the requirements of this Section are met and the Agency has determined that no further remediation is required as to the property(ies) to which the agreement is to apply.

     

    b) As part of the agreement the highway authority shall agree to:

     

    1) Prohibit the use of groundwater under the highway right of way that is contaminated above residential Tier 1 remediation objectives from the release as a potable supply of water.

     

    2) Limit access to soil contamination under the highway right of way that is contaminated above residential Tier 1 remediation objectives from the release. Access to soil contamination may be allowed if, during and after any access, public health and the environment are protected.

     

    c) A request for approval of an agreement as an institutional control shall provide the following:

     

    1) A copy of the agreement executed by the highway authority and the owner of the property from which the release occurred;

     

    2) A scaled map delineating the areal extent of soil and groundwater contamination above the applicable Tier 1 remediation objectives;

     

    3) Information showing the concentration of contaminants of concern within the zone in which the applicable Tier 1 remediation objectives are exceeded;

     

    4) A stipulation of the information required by subsection (b) of this Section in the agreement if it is not practical to obtain the information by sampling the highway right-of-way; and

     

    5) Information identifying the current fee owner of the highway right-of-way and highway authority having jurisdiction.

     

    d) Violation of the terms of an Agreement approved by the Agency as an institutional control under this Section shall be grounds for voidance of the Agreement as an institutional control and the instrument memorializing the Agency's no further remediation determination.

     
     
    SUBPART K: ENGINEERED BARRIERS
     

    Section 742.1100
    Engineered Barriers

     

    a) Any person who develops remediation objectives under this Part based on engineered barriers shall meet the requirements of this Subpart and the requirements of Subpart J relative to institutional controls.

     

    b) The Agency shall not approve any remediation objective under this Part that is based on the use of engineered barriers unless the person has proposed engineered barriers meeting the requirements of this Subpart.

     

    c) The use of engineered barriers can be recognized in calculating remediation objectives only if the engineered barriers are intended for use as part of the final corrective action.

     

    d) Any no further remediation determination based upon the use of engineered barriers shall require effective maintenance of the engineered barrier. The maintenance requirements shall be included in an institutional control under Subpart J. This institutional control shall address provisions for temporary breaches of the barrier by requiring the following if intrusive construction work is to be performed in which the engineered barrier is to be temporarily breached:

     

    1) The construction workers shall be notified by the site owner/operator in advance of intrusive activities. Such notification shall enumerate the contaminant of concern known to be present; and

     

    2) The site owner/operator shall require construction workers to implement protective measures consistent with good industrial hygiene practice.

     

    e) Failure to maintain an engineered barrier in accordance with the no further remediation determination shall be grounds for voidance of that determination and the instrument memorializing the Agency’s no further remediation determination.

     

    Section 742.1105
    Engineered Barrier Requirements

     

    a) Natural attenuation, access controls, and point of use treatment shall not be considered engineered barriers. Engineered barriers may not be used to prevent direct human exposure to groundwater without the use of institutional controls.

     

    b) For purposes of determining remediation objectives under Tier 1, engineered barriers are not recognized.

     

    c) The following engineered barriers are recognized for purposes of calculating remediation objectives that exceed residential remediation objectives:

     

    1) For the soil component of the groundwater ingestion exposure route, the following engineered barriers are recognized:

     

    A) Caps, covering the contaminated media, constructed of compacted clay, asphalt, concrete or other material approved by the Agency; and

     

    B) Permanent structures such as buildings and highways.

     

    2) For the soil ingestion exposure route, the following engineered barriers are recognized:

     

    A) Caps, covering the contaminated media, constructed of compacted clay, asphalt, concrete, or other material approved by the Agency;

     

    B) Permanent structures such as buildings and highways; and

     

    C) Clean soil, covering the contaminated media, that is a minimum of 3 feet in depth.

     

    3) For the inhalation exposure route, the following engineered barriers are recognized:

     

    A) Caps, covering the contaminated media, constructed of compacted clay, asphalt, concrete, or other material approved by the Agency;

     

    B) Permanent structures such as buildings and highways; and

     

    C) Clean soil covering the contaminated media, that is a minimum of 10 feet in depth and not within 10 feet of any manmade pathway.

     

    4) For the ingestion of groundwater exposure route, the following engineered barriers are recognized:

     

    A) Slurry walls; and

     

    B) Hydraulic control of groundwater.

     

     
    d) Unless otherwise prohibited under Section 742.1100, any other type of engineered barrier may be proposed if it will be as effective as the options listed in subsection (c) of this Section.


     
    Section 742.APPENDIX A:
    General

    Section 742.Illustration A:  Developing Soil Remediation Objectives Under the Tiered Approach

     


     
     
     


    Section 742.APPENDIX A:
    General

     
    Section 742.Illustration B:  Developing Groundwater Remediation Objectives Under the Tiered Approach

     

      



    Section 742.APPENDIX A:  General
     

    Section 742.TABLE A: Soil Saturation Limits (Csat)for Chemicals Whose Melting Point is Less than 30° C
    CAS No. Chemical Name
    Csat (mg/kg)
    67-64-1 Acetone
    100,000
    71-43-2 Benzene
    870
    111-44-4 Bis(2-chloroethyl)ether
    3,300
    117-81-7 Bis(2-ethylhexyl)phthalate
    31,000
    75-27-4 Bromodichloromethane (Dichlorobromomethane)
    3,000
    75-25-2 Bromoform
    1,900
    71-36-3 Butanol
    10,000
    85-68-7 Butyl benzyl phthalate
    930
    75-15-0 Carbon disulfide
    720
    56-23-5 Carbon tetrachloride
    1,100
    108-90-7 Chlorobenzene (Monochlorobenzene)
    680
    124-48-1 Chlorodibromomethane (Dibromochloromethane)
    1,300
    67-66-3 Chloroform
    2,900
    96-12-8 1,2-Dibromo-3-chloropropane
    1,400
    106-93-4 1,2-Dibromoethane (Ethylene dibromide)
    2,800
    84-74-2 Di-n-butyl phthalate
    2,300
    95-50-1 1,2-Dichlorobenzene (o-Dichlorobenzene)
    560
    75-34-3 1,1-Dichloroethane
    1,700
    107-06-2 1,2-Dichloroethane (Ethylene dichloride)
    1,800
    75-35-4 1,1-Dichloroethylene
    1,500
    156-59-2 cis-1,2-Dichloroethylene
    1,200
    156-60-5 trans-1,2-Dichloroethylene
    3,100
    78-87-5 1,2-Dichloropropane
    1,100
    542-75-6 1,3-Dichloropropene (1,3-Dichloropropylene, cis + trans)
    1,400

    CAS No. Chemical Name
    Csat (mg/kg)
    84-66-2 Diethyl phthalate
    2,000
    117-84-0 Di-n-octyl phthalate
    10,000
    100-41-4 Ethylbenzene
    400
    77-47-4 Hexachlorocyclopentadiene
    2,200
    78-59-1 Isophorone
    4,600
    74-83-9 Methyl bromide (Bromomethane)
    3,200
    75-09-2 Methylene chloride (Dichloromethane)
    2,400
    98-95-3 Nitrobenzene
    1,000
    100-42-5 Styrene
    1,500
    127-18-4 Tetrachloroethylene (Perchloroethylene)
    240
    108-88-3 Toluene
    650
    120-82-1 1,2,4-Trichlorobenzene
    3,200
    71-55-6 1,1,1-Trichloroethane
    1,200
    79-00-5 1,1,2-Trichloroethane
    1,800
    79-01-6 Trichloroethylene
    1,300
    108-05-4 Vinyl acetate
    2,700
    75-01-4 Vinyl chloride
    1,200
    108-38-3 m-Xylene
    420
    95-47-6 o-Xylene
    410
    106-42-3 p-Xylene
    460
    1330-20-7 Xylenes (total)
    410
      Ionizable Organics  
    95-57-8 2-Chlorophenol
    53,000



    Section 742.APPENDIX A:
    General

     



    Section 742.TABLE B:  Tolerance Factor (K)
     
    Tolerance factors (K) for one-sided normal tolerance intervals with probability level (confidence factor) Y = 0.95 and coverage P = 95%. n = number of samples collected.
     

    n KnK

     
     
     3    7.655
     4    5.145
     5    4.202
     6    3.707
     7    3.399
     8    3.188
     9    3.031
     10    2.911
     11    2.815
     12    2.736
     13    2.670
     14    2.614
     15    2.566
     16    2.523
     17    2.486
     18    2.543
     19    2.423
     20    2.396
     21    2.371
     22    2.350
     23    2.329
     24    2.309
     25    2.292
     30    2.220
     35    2.166
     40    2.126
     45    2.092
     50    2.065
     55    2.036
     60    2.017
     65    2.000
     70    1.986
     75    1.972
     100    1.924
     125    1.891
     150    1.868
     175    1.850
     200    1.836
     225    1.824
     250    1.814
     275    1.806
     300    1.799
     325    1.792
     350    1.787
     375    1.782
     400    1.777
     425    1.773
     450    1.769
     475    1.766
     500    1.763
     525    1.760
     550    1.757
     575    1.754
     600    1.752
     625    1.750
     650    1.748
     675    1.746
     700    1.744
     725    1.742
     750    1.740
     n    K
     
     775    1.739
     800    1.737
     825    1.736
     850    1.734
     875    1.733
     900    1.732
     925    1.731
     950    1.729
     975    1.728
     1000    1.727
     


    Section 742.APPENDIX A:
    General

     


    Section 742.TABLE C:
    Coefficients {AN-I+1} for W Test of Normality, for N=2(1)50

     
    i/n 2 3 4 5 6 7 8 9 10  
    1 0.7071 0.7071 0.6872 0.6646 0.6431 0.6233 0.6052 0.5888 0.5739  
    2 --- .0000 .1677 .2413 .2806 .3031 .3164 .3244 .3291  
    3 --- --- --- .0000 .0875 .1401 .1743 .1976 .2141  
    4 --- --- --- --- --- .0000 .0561 .0947 .1224  
    5 --- --- --- --- --- --- --- .0000 .0399    
     
    i/n
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    1 0.5601 0.5475 0.5359 0.5251 0.5150 0.5056 0.4968 0.4886 0.4808 0.4734
    2 .3315 .3325 .3325 .3318 .3306 .3290 .3273 .3253 .3232 .3211
    3 .2260 .2347 .2412 .2460 .2495 .2521 .2540 .2553 .2561 .2565
    4 .1429 .1586 .1707 .1802 .1878 .1939 .1988 .2027 .2059 .2085
    5 .0695 .0922 .1099 .1240 .1353 .1447 .1524 .1587 .1641 .1686
     
    6 0.0000 0.0303 0.0539 0.0727 0.0880 0.1005 0.1109 0.1197 0.1271 0.1334
    7 --- --- .0000 .0240 .0433 .0593 .0725 .0837 .0932 .1013
    8 --- --- --- --- .0000 .0196 .0359 .0496 .0612 .0711
    9 --- --- --- --- --- --- .0000 .0163 .0303 .0422
    10 --- --- --- --- --- --- --- --- .0000 .0140
     

    i/n
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    1 0.4643 0.4590 0.4542 0.4493 0.4450 0.4407 0.4366 0.4328 0.4291 0.4254
    2 .3185 .3156 .3126 .3098 .3069 .3043 .3018 .2992 .2968 .2944
    3 .2578 .2571 .2563 .2554 .2543 .2533 .2522 .2510 .2499 .2487
    4 .2119 .2131 .2139 .2145 .2148 .2151 .2152 .2151 .2150 .2148
    5 .1736 .1764 .1787 .1807 .1822 .1836 .1848 .1857 .1864 .1870
     
    6 0.1399 0.1443 0.1480 0.1512 0.1539 0.1563 0.1584 0.1601 0.1616 0.1630
    7 .1092 .1150 .1201 .1245 .1283 .1316 .1346 .1372 .1395 .1415
    8 .0804 .0878 .0941 .0997 .1046 .1089 .1128 .1162 .1192 .1219
    9 .0530 .0618 .0696 .0764 .0823 .0876 .0923 .0965 .1002 .1036
    10 .0263 .0368 .0459 .0539 .0610 .0672 .0728 .0778 .0822 .0862
     
    11 0.0000 0.0122 0.0228 0.0321 0.0403 0.0476 0.0540 0.0598 0.0650 0.0697
    12 --- --- .0000 .0107 .0200 .0284 .0358 .0424 .0483 .0537
    13 --- --- --- --- .0000 .0094 .0178 .0253 .0320 .0381
    14 --- --- --- --- --- --- .0000 .0084 .0159 .0227
    15 --- --- --- --- --- --- --- --- .0000 .0076
     

    i/n
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    1 0.4220 0.4188 0.4156 0.4127 0.4096 0.4068 0.4040 0.4015 0.3989 0.3964
    2 .2921 .2898 .2876 .2854 .2834 .2813 .2794 .2774 .2755 .2737
    3 .2475 .2463 .2451 .2439 .2427 .2415 .2403 .2391 .2380 .2368
    4 .2145 .2141 .2137 .2132 .2127 .2121 .2116 .2110 .2104 .2098
    5 .1874 .1878 .1880 .1882 .1883 .1883 .1883 .1881 .1880 .1878
     
    i/n
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    6 0.1641 0.1651 0.1660 0.1667 0.1673 0.1678 0.1683 0.1686 0.1689 0.1691
    7 .1433 .1449 .1463 .1475 .1487 .1496 .1503 .1513 .1520 .1526
    8 .1243 .1265 .1284 .1301 .1317 .1331 .1344 .1356 .1366 .1376
    9 .1066 .1093 .1118 .1140 .1160 .1179 .1196 .1211 .1225 .1237
    10 .0899 .0931 .0961 .0988 .1013 .1036 .1056 .1075 .1092 .1108
     
    11 0.0739 0.0777 0.0812 0.0844 0.0873 0.0900 0.0924 0.0947 0.0967 0.0986
    12 .0585 .0629 .0669 .0706 .0739 .0770 .0798 .0824 .0848 .0870
    13 .0435 .0485 .0530 .0572 .0610 .0645 .0677 .0706 .0733 .0759
    14 .0289 .0344 .0395 .0441 .0484 .0523 .0559 .0592 .0622 .0651
    15 .0144 .0206 .0262 .0314 .0361 .0404 .0444 .0481 .0515 .0546
     

    16 0.0000 0.0068 0.0131 0.0187 0.0239 0.0287 0.0331 0.0372 0.0409 0.0444
    17 --- --- .0000 .0062 .0119 .0172 .0220 .0264 .0305 .0343
    18 --- --- --- --- .0000 .0057 .0110 .0158 .0203 .0244
    19 --- --- --- --- --- --- .0000 .0053 .0101 .0146
    20 --- --- --- --- --- --- --- --- .0000 .0049
     
    i/n
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    1 0.3940 0.3917 0.3894 0.3872 0.3850 0.3830 0.3808 0.3789 0.3770 0.3751
    2 .2719 .2701 .2684 .2667 .2651 .2635 .2620 .2604 .2589 .2574
    3 .2357 .2345 .2334 .2323 .2313 .2302 .2291 .2281 .2271 .2260
    4 .2091 .2085 .2078 .2072 .2065 .2058 .2052 .2045 .2038 .2032
    5 .1876 .1874 .1871 .1868 .1865 .1862 .1859 .1855 .1851 .1847
     
    i/n
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    6 0.1693 0.1694 0.1695 0.1695 0.1695 0.1695 0.1695 0.1693 0.1692 0.1691
    7 .1531 .1535 .1539 .1542 .1545 .1548 .1550 .1551 .1553 .1554
    8 .1384 .1392 .1398 .1405 .1410 .1415 .1420 .1423` .1427 .1430
    9 .1249 .1259 .1269 .1278 .1286 .1293 .1300 .1306 .1312 .1317
    10 .1123 .1136 .1149 .1160 .1170 .1180 .1189 .1197 .1205 .1212
     

    11 0.1004 0.1020 0.1035 0.1049 0.1062 0.1073 0.1085 0.1095 0.1105 0.1113
    12 .0891 .0909 .0927 .0943 .0959 .0972 .0986 .0998 .1010 .1020
    13 .0782 .0804 .0824 .0842 .0860 .0876 .0892 .0906 .0919 .0932
    14 .0677 .0701 .0724 .0745 .0775 .0785 .0801 .0817 .0832 .0846
    15 .0575 .0602 .0628 .0651 .0673 .0694 .0713 .0731 .0748 .0764
     
    16 0.0476 0.0506 0.0534 0.0560 0.0584 0.0607 0.0628 0.0648 0.0667 0.0685
    17 .0379 .0411 .0442 .0471 .0497 .0522 .0546 .0568 .0588 .0608
    18 .0283 .0318 .0352 .0383 .0412 .0439 .0465 .0489 .0511 .0532
    19 .0188 .0227 .0263 .0296 .0328 .0357 .0385 .0411 .0436 .0459
    20 .0094 .0136 .0175 .0211 .0245 .0277 .0307 .0335 .0361 .0386
     
    21 0.0000 0.0045 0.0087 0.0126 0.0163 0.0197 0.0229 0.0259 0.0288 0.0314
    22 --- --- .0000 .0042 .0081 .0118 .0153 .0185 .0215 .0244
    23 --- --- --- --- .0000 .0039 .0076 .0111 .0143 .0174
    24 --- --- --- --- --- --- .0000 .0037 .0071 .0104
    25 --- --- --- --- --- --- --- --- .0000 .0035


    Section 742.APPENDIX A:
    General

     


    Section 742.TABLE D:
    Percentage Points of the W Test for N=3(1)50

     
    n
    0.01
    0.05
    3 0.753 0.767
    4 0.687 0.748
    5 0.686 0.762
    6 0.713 0.788
    7 0.730 0.803
    8 0.749 0.818
    9 0.764 0.829
    10 0.781 0.842
    11 0.792 0.850
    12 0.805 0.859
    13 0.814 0.866
    14 0.825 0.874
    15 0.835 0.881
    16 0.844 0.887
    17 0.851 0.892
    18 0.858 0.897
    19 0.863 0.901
    20 0.868 0.905
    21 0.873 0.908
    22 0.878 0.911
    23 0.881 0.914
    24 0.884 0.916
    25 0.888 0.918
    26 0.891 0.920
    27 0.894 0.923
    28 0.896 0.924
    29 0.898 0.926
    30 0.900 0.927
    31 0.902 0.929
    32 0.904 0.930
    33 0.906 0.931
    34 0.908 0.933
    35 0.910 0.934

     


    Section 742.APPENDIX A:
    General

     

     
    Section 742.TABLE E: Chemicals with Noncarcinogenic Toxic Effects on Specific Target Organs/Organ Systems or Similar Modes of Action

     
    Kidney
    Acetone
    Cadmium (Ingestion only)
    Chlorobenzene
    Dalapon
    1,1-Dichloroethane
    Di-n-octyl phthalate
    Endosulfan
    Ethylbenzene
    Fluoranthene
    Nitrobenzene
    Pyrene
    Toluene
    2,4,5-Trichlorophenol
    Vinyl acetate
     
    Liver
    Acenaphthene
    Acetone
    Butylbenzyl phthalate
    1,1-Dichloroethylene
    Chlorobenzene
    Di-n-octyl phthalate
    Endrin
    Ethylbenzene
    Fluoranthene
    Nitrobenzene
    Picloram
    Styrene
    2,4,5-TP (Silvex)
    Toluene
    2,4,5-Trichlorophenol
     
     
     
    Central Nervous System
    Butanol
    Cyanide (amenable)
    2,4-Dimethylphenol
    Endrin
    Manganese
    2-Methylphenol
    Mercury
    Styrene
    Xylenes
     
    Circulatory System
    Antimony
    Barium
    2,4-D
    cis-1,2-Dichloroethylene
    Nitrobenzene
    trans-1,2-Dichloroethylene
    2,4-Dimethylphenol
    Fluoranthene
    Fluorene
    Styrene
    Zinc
     
    Gastrointestinal System
    Endothall
    Hexachlorocyclopentadiene
    Methyl bromide
     
    Reproductive System
    Barium
    Boron
    Carbon disulfide
    2-Chlorophenol

    1,2 Dibromo-3-Chloropropane (Inhalation only)

    Dinoseb
    Methoxychlor
    Phenol
     
     
     
     
     
    Cholinesterase Inhibition
    Aldicarb
    Carbofuran
     
    Decreased Body Weight Gains
    and Circulatory System Effects
    Atrazine
    Simazine
     
    Adrenal Gland
    Nitrobenzene
    1,2,4-Trichlorobenzene
     
    Respiratory System
    1,2-Dichloropropane
    Hexachlorocyclopentadiene
    Methyl bromide
    Vinyl acetate
     
    Immune System
    2,4-Dichlorophenol

     
    p-Chloroaniline



    Section 742.APPENDIX A: General
     

    Section 742.TABLE F: Chemicals With Carcinogenic Toxic Effects on Specific Target Organs/Organ Systems or Similar Modes of Action

     
     
    Kidney
    Bromodichloromethane
    Chloroform
    1,2-Dibromo-3-chloropropane
    2,4-Dinitrotoluene
    2,6-Dinitrotoluene
    Hexachlorobenzene
     
    Liver
    Aldrin
    Bis(2-chloroethyl)ether
    Bis(2-ethylhexyl)phthalate
    Carbazole
    Carbon tetrachloride
    Chlordane
    Chloroform
    DDD
    DDE
    DDT
    1,2-Dibromo-3-chloropropane
    1,2-Dibromoethane
    3,3'-Dichlorobenzidine
    1,2-Dichloroethane
    1,3-Dichloropropane (Ingestion only)
    1,3-Dichloropropylene
    Dieldrin
    2,4-Dinitrotoluene
    2,6-Dinitrotoluene
    Heptachlor
    Heptachlor epoxide
    Hexachlorobenzene
    alpha-HCH
    gamma-HCH (Lindane)
    Methylene chloride
    N-Nitrosodiphenylamine
    N-Nitrosodi-n-propylamine
    Pentachlorophenol
    Tetrachloroethylene
    Trichloroethylene
    2,4,6-Trichlorophenol
    Toxaphene
    Vinyl chloride
     
    Circulatory System
    Benzene
    2,4,6-Trichlorophenol
     
    Gastrointestinal System
    Benzo(a)anthracene
    Benzo(b)fluoranthene
    Benzo(k)fluoranthene
    Benzo(a)pyrene
    Chrysene
    Dibenzo(a,h)anthracene
    Indeno(1,2,3-c,d)pyrene
    Bromodichloromethane
    Bromoform
    1,2-Dibromo-3-chloropropane
    1,2-Dibromoethane
    1,3-Dichloropropylene
     
    Lung
    Arsenic
    Beryllium (Inhalation only)
    Cadmium (Inhalation only)
    Chromium, hexavalent (Inhalation only)
    1,3-Dichloropropylene
    Methylene chloride
    N-Nitrosodi-n-propylamine
    Vinyl chloride
     
    Nasal Cavity
    1,2-Dibromo-3-chloropropane
    (Inhalation only)
    1,2-Dibromoethane (Inhalation only)
    N-Nitrosodi-n-propylamine
     
    Bladder
    3,3'-Dichlorobenzidine
    1,3-Dichloropropylene
    N-Nitrosodiphenylamine
     


    Section 742.APPENDIX A:
    General

     



    Section 742.TABLE G:  Concentrations of Inorganic Chemicals in Background Soils
     
    Chemical Name
    Counties Within
    Metropolitan
    Statistical Areasa
    (mg/kg)
    Counties Outside
    Metropolitan
    Statistical Areas
    (mg/kg)
    Aluminum
    9,500
    9,200
    Antimony
    4.0
    3.3
    Arsenic
    7.2
    5.2
    Barium
    110`
    122
    Beryllium
    0.59
    0.56
    Cadmium
    0.6
    0.50
    Calcium
    9,300
    5,525
    Chromium
    16.2
    13.0
    Cobalt
    8.9
    8.9
    Copper
    19.6
    12.0
    Cyanide
    0.51
    0.50
    Iron
    15,900
    15,000
    Lead
    36.0
    20.9
    Magnesium
    4,820
    2,700
    Manganese
    636
    630
    Mercury
    0.06
    0.05
     

     

    aCounties within Metropolitan Statistical Areas: Boone, Champaign, Clinton, Cook, DuPage, Grundy, Henry, Jersey, Kane, Kankakee, Kendall, Lake, Macon, Madison, McHenry, McLean, Menard, Monroe, Peoria, Rock Island, Sangamon, St. Clair, Tazewell, Will, Winnebago and Woodford.



     
    Chemical Name
    Counties Within
    Metropolitan
    Statistical Areasa
    (mg/kg)
    Counties Outside
    Metropolitan
    Statistical Areas
    (mg/kg)
    Nickel
    18.0
    13.0
    Potassium
    1,268
    1,100
    Selenium
    0.48
    0.37
    Silver
    0.55
    0.50
    Sodium
    130
    130.0
    Sulfate
    85.5
    110
    Sulfide
    3.1
    2.9
    Thallium
    0.32
    0.42
    Vanadium
    25.2
    25.0
    Zinc
    95.0
    60.2



    Section 742.APPENDIX B:  Tier 1 Tables and Illustrations
     



    Section 742.Illustration A: Tier 1 Evaluation
     

      


    Section 742.APPENDIX B: Tier 1 Tables and Illustrations

     

    Section 742.TABLE A:
    Tier 1 Soil Remediation Objectivesa for Residential Properties

     
    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    83-32-9 Acenaphthene
    4,700b
    ---c
    570b
    2,900
    *
    67-64-1 Acetone
    7,800b
    100,000d
    16b
    16
    *
    15972-60-8 Alachloro
    8e
    ---c
    0.04
    0.2
    NA
    116-06-3 Aldicarbo
    78b
    ---c
    0.013
    0.07
    NA
    309-00-2 Aldrin
    0.04e
    3e
    0.5e
    2.5
    *
    120-12-7 Anthracene
    23,000b
    ---c
    12,000b
    59,000
    *
    1912-24-9 Atrazineo
    2700b
    ---c
    0.066
    0.33
    NA
    71-43-2 Benzene
    22e
    0.8e
    0.03
    0.17
    *
    56-55-3 Benzo(a)anthracene
    0.9e
    ---c
    2
    8
    *
    205-99-2 Benzo(b)fluoranthene
    0.9e
    ---c
    5
    25
    *

    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    207-08-9 Benzo(k)fluroanthene
    9e
    ---c
    49
    250
    *
    50-32-8 Benzo(a)pyrene
    0.09e,f
    ---c
    8
    82
    *
    111-44-4 Bis(2-chloroethyl)ether
    0.6e
    0.2e,f
    0.0004e,f
    0.0004
    0.66
    117-81-7 Bis(2-ethylhexyl)phthalate
    46e
    31,000d
    3,600
    31,000d
    *
    75-27-4 Bromodichloromethane
    (Dichlorobromomethane)
    10e
    3,000d
    0.6
    0.6
    *
    75-25-2 Bromoform
    81e
    53e
    0.8
    0.8
    *
    71-36-3 Butanol
    7,800b
    10,000d
    17b
    17
    NA
    85-68-7 Butyl benzyl phthalate
    16,000b
    930d
    930d
    930d
    *
    86-74-8 Carbazole
    32e
    ---c
    0.6e
    2.8
    NA
    1563-66-2 Carbofurano
    390b
    ---c
    0.22
    1.1
    NA
    75-15-0 Carbon disulfide
    7,800b
    720d
    32b
    160
    *

    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    56-23-5 Carbon tetrachloride
    5e
    0.3e
    0.07
    0.33
    *
    57-74-9 Chlordane
    0.5e
    20e
    10
    48
    *
    106-47-8 4-Chloroaniline
    (p-Chloroaniline)
    310b
    ---c
    0.7b
    0.7
    1.3
    108-90-7 Chlorobenzene
    (Monochlorobenzene)
    1,600b
    130b
    1
    6.5
    *
    124-48-1 Chlorodibromomethane
    (Dibromochloromethane)
    1,600b
    1,300d
    0.4
    0.4
    *
    67-66-3 Chloroform
    100e
    0.3e
    0.6
    2.9
    *
    218-01-9 Chrysene
    88e
    ---c
    160
    800
    *
    94-75-7 2,4-D
    780b
    ---c
    1.5
    7.7
    *
    75-99-0 Dalapon
    2,300b
    ---c
    0.85
    8.5
    1.2
    72-54-8 DDD
    3e
    ---c
    16e
    80
    *
    72-55-9 DDE
    2e
    ---c
    54e
    270
    *

    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    50-29-3 DDT
    2e
    ---g
    32e
    160
    *
    53-70-3 Dibenzo(a,h)anthracene
    0.09e,f
    ---c
    2
    7.6
    *
    96-12-8 1,2-Dibromo-3-chloropropane
    0.46e
    11b
    0.002
    0.002
    *
    106-93-4 1,2-Dibromoethane
    (Ethylene dibromide)
    0.0075e
    0.17e
    0.0004
    0.004
    0.005
    84-74-2 Di-n-butyl phthalate
    7,800b
    2,300d
    2,300d
    2,300d
    *
    95-50-1 1,2-Dichlorobenzene
    (o - Dichlorobenzene)
    7,000b
    560d
    17
    43
    *
    106-46-7 1,4-Dichlorobenzene
    (p - Dichlorobenzene)
    ---c
    ---g
    2
    11
    *
    91-94-1 3,3'-Dichlorobenzidine
    1e
    ---c
    0.007e,f
    0.033
    1.3
    75-34-3 1,1-Dichloroethane
    7,800b
    1,300b
    23b
    110
    *


     
    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    107-06-2 1,2-Dichloroethane
    (Ethylene dichloride)
    7e
    0.4e
    0.02
    0.1
    *
    75-35-4 1,1-Dichloroethylene
    700b
    1,500d
    0.06
    0.3
    *
    156-59-2 cis-1,2-Dichloroethylene
    780b
    1,200d
    0.4
    1.1
    *
    156-60-5 trans-1,2-Dichloroethylene
    1,600b
    3,100d
    0.7
    3.4
    *
    78-87-5 1,2-Dichloropropane
    9e
    15b
    0.03
    0.15
    *
    542-75-6 1,3-Dichloropropene
    (1,3-Dichloropropylene, cis + trans)
    4e
    0.1e
    0.004e
    0.02
    0.005
    60-57-1 Dieldrinn
    0.04e
    1e
    0.004e
    0.02
    *
    84-66-2 Diethyl phthalate
    63,000b
    2,000d
    470b
    470
    *
    105-67-9 2,4-Dimethylphenol
    1,600b
    ---c
    9b
    9
    *
    121-14-2 2,4-Dinitrotoluene
    0.9e
    ---c
    0.0008e,f
    0.0008
    0.013

    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    606-20-2 2,6-Dinitrotoluene
    0.9e
    ---c
    0.0007e,f
    0.0007
    0.0067
    117-84-0 Di-n-octyl phthalate
    1,600b
    10,000d
    10,000d
    10,000d
    *
    115-29-7 Endosulfan
    470b
    ---c
    18b
    90
    *
    145-73-3 Endothallo
    1,600b
    ---c
    0.4
    0.4
    NA
    72-20-8 Endrin
    23b
    ---c
    1
    5
    *
    100-41-4 Ethylbenzene
    7,800b
    400d
    13
    19
    *
    206-44-0 Fluoranthene
    3,100b
    ---c
    4,300b
    21,000
    *
    86-73-7 Fluorene
    3,100b
    ---c
    560b
    2,800
    *
    76-44-8 Heptachlor
    0.1e
    0.1e
    23
    110
    *
    1024-57-3 Heptachlor epoxide
    0.07e
    5e
    0.7
    3.3
    *
    118-74-1 Hexachlorobenzene
    0.4e
    1e
    2
    11
    *
    319-84-6 alpha-HCH (alpha-BHC)
    0.1e
    0.8e
    0.0005e,f
    0.003
    0.002

    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    58-89-9 gamma-HCH (Lindane)n
    0.5e
    ---c
    0.009
    0.047
    *
    77-47-4 Hexachlorocyclopentadiene
    550b
    10b
    400
    2,200d
    *
    67-72-1 Hexachloroethane
    78b
    ---c
    0.5b
    2.6
    *
    193-39-5 Indeno(1,2,3-c,d)pyrene
    0.9e
    ---c
    14
    69
    *
    78-59-1 Isophorone
    15,600b
    4,600d
    8b
    8
    *
    72-43-5 Methoxychlor
    390b
    ---c
    160
    780
    *
    74-83-9 Methyl bromide
    (Bromomethane)
    110b
    10b
    0.2b
    1.2
    *
    75-09-2 Methylene chloride
    (Dichloromethane)
    85e
    13e
    0.02e
    0.2
    *
    95-48-7 2-Methylphenol
    (o - Cresol)
    3,900b
    ---c
    15b
    15
    *
    91-20-3 Naphthalene
    3,100b
    ---c
    84b
    420
    *
    98-95-3 Nitrobenzene
    39b
    92b
    0.1b,f
    0.1
    0.26

    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    86-30-6 N-Nitrosodiphenylamine
    130e
    ---c
    1e
    5.6
    *
    621-64-7 N-Nitrosodi-n-propylamine
    0.09e,f
    ---c
    0.00005e,f
    0.00005
    0.66
    108-95-2 Phenol
    47,000b
    ---c
    100b
    100
    *
    1918-02-1 Picloramo
    5,500b
    ---c
    2
    20
    NA
    1336-36-3 Polychlorinated biphenyls (PCBs)n
    1; 10h
    ---c,h
    ---h
    ---h
    *
    129-00-0 Pyrene
    2,300b
    ---c
    4,200b
    21,000
    *
    122-34-9 Simazineo
    390b
    ---c
    0.04
    0.37
    NA
    100-42-5 Styrene
    16,000b
    1,500d
    4
    18
    *
    127-18-4 Tetrachloroethylene
    (Perchloroethylene)
    12e
    11e
    0.06
    0.3
    *
    108-88-3 Toluene
    16,000b
    650d
    12
    29
    *

    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    8001-35-2 Toxaphenen
    0.6e
    89e
    31
    150
    *
    120-82-1 1,2,4-Trichlorobenzene
    780b
    3,200b
    5
    53
    *
    71-55-6 1,1,1-Trichloroethane
    ---c
    1,200d
    2
    9.6
    *
    79-00-5 1,1,2-Trichloroethane
    310b
    1,800d
    0.02
    0.3
    *
    79-01-6 Trichloroethylene
    58e
    5e
    0.06
    0.3
    *
    108-05-4 Vinyl acetate
    78,000b
    1,000b
    170b
    170
    *
    75-01-4 Vinyl chloride
    0.3e
    0.03e
    0.01f
    0.07
    *
    108-38-3 m-Xylene
    160,000b
    420d
    210
    210
    *
    95-47-6 o-Xylene
    160,000b
    410d
    190
    190
    *
    106-42-3 p-Xylene
    160,000b
    460d
    200
    200
    *

    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route
    Values      		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II  
    (mg/kg)
    ADL
    (mg/kg)
    1330-20-7 Xylenes (total)
    160,000b
    410d
    150
    150
    *
      Ionizable Organics          
    65-85-0 Benzoic Acid
    310,000b
    ---c
    400b,i
    400i
    *
    95-57-8 2-Chlorophenol
    390b
    53,000d
    4b,i
    4i
    *
    120-83-2 2,4-Dichlorophenol
    230b
    ---c
    1b,i
    1i
    *
    51-28-5 2,4-Dinitrophenol
    160b
    ---c
    0.2b,f
    0.2
    3.3
    88-85-7 Dinosebo
    78b
    ---c
    0.34b,i
    3.4i
    *
    87-86-5 Pentachlorophenol
    3e,j
    ---c
    0.03f,i
    0.14i
    2.4
    93-72-1 2,4,5-TP
    (Silvex)
    630b
    ---c
    11i
    55i
    *
    95-95-4 2,4,5-Trichlorophenol
    7,800b
    ---c
    270b,i
    1,400i
    *
    88-06-2 2,4,6 Trichlorophenol
    58e
    200e
    0.2e,f,i
    0.77i
    0.43

       
    Exposure Route-specific Values for Soils

     

    Soil Component of the Groundwater Ingestion Exposure Route
    Values
         		  
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/L)
     
    Class II
    (mg/L)
     
    ADL
    (mg/kg)
      Inorganics          
    7440-36-0 Antimony
    31b
    ---c
    0.006m
    0.024m
    *
    7440-38-2 Arsenicl,n
    0.4e,t
    750e
    0.05m
    0.2m
    *
    7440-39-3 Barium
    5,500b
    690,000b
    2.0m
    2.0m
    *
    7440-41-7 Beryllium
    0.1e,t
    1,300e
    0.004m
    0.5m
    *
    7440-42-8 Boron
    7,000b
    ---g
    2.0m
    2.0m
    *
    7440-43-9 Cadmiuml,n
    78b, r
    1,800e
    0.005m
    0.05m
    *
    16887-00-6 Chloride
    ---c
    ---c
    200m
    200m
    *
    7440-47-3 Chromium, total
    390b
    270e
    0.1m
    1.0m
    *
    16065-83-1 Chromium, ion, trivalent
    78,000b
    ---c
    ---g
    ---g
    *
    18540-29-9 Chromium, ion, hexavalent
    390b
    270e
    ---
    ---
    *
    7440-48-4 Cobalt
    4,700b
    ---c
    1.0m
    1.0m
    *

       
    Exposure Route-specific Values for Soils

     

    Soil Component of the Groundwater Ingestion Exposure Route
    Values
    		     
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/L)
     
    Class II
    (mg/L)
     
    ADL
    (mg/kg)
    7440-50-8 Coppern
    2,900b
    ---c
    0.65m
    0.65m
    *
    57-12-5 Cyanide (amenable)
    1,600b
    ---c
    0.2q
    0.6q
    *
    7782-41-4 Fluoride
    4,700b
    ---c
    4.0m
    4.0m
    *
    15438-31-0 Iron
    ---c
    ---c
    5.0m
    5.0m
    *
    7439-92-1 Lead
    400k
    ---c
    0.0075m
    0.1m
    *
    7439-96-5 Manganese
    3,700b
    69,000b
    0.15m
    10.0m
    *
    7439-97-6 Mercuryl,n
    23b,s
    10b,i
    0.002m
    0.01m
    *
    7440-02-0 Nickell
    1,600b
    13,000e
    0.1m
    2.0m
    *
    14797-55-8 Nitrate as Np
    130,000b
    ---c
    10.0q
    100q
    *
    7782-49-2 Seleniuml,n
    390b
    ---c
    0.05m
    0.05m
    *

       
    Exposure Route-specific Values for Soils

     

    Soil Component of the Groundwater Ingestion Exposure Route
    Values
    		     
    CAS No. Chemical Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/L)
     
    Class II
    (mg/L)
     
    ADL
    (mg/kg)
    7440-22-4 Silver
    390b
    ---c
    0.05m
    ---
    *
    14808-79-8 Sulfate
    ---c
    ---c
    400m
    400m
    *
    7440-28-0 Thallium
    ­6.3b,u
    ---c
    0.002m
    0.02m
    *
    7440-62-2 Vanadium
    550b
    ---c
    0.049m
    ---
    *
    7440-66-6 Zincl
    23,000b
    ---c
    5.0m
    10m
    *
    "*" indicates that the ADL is less than or equal to the specified remediation objective.

    NA means not available; no PQL or EQL available in USEPA analytical methods.
     

    Chemical Name and Soil Remediation Objective Notations
     

    a Soil remediation objectives based on human health criteria only.
    b Calculated values correspond to a target hazard quotient of 1.
    c No toxicity criteria available for the route of exposure.
    d Soil saturation concentration (Csat) = the concentration at which the absorptive limits of the soil particles, the solubility limits of the available soil moisture, and saturation of soil pore air have been reached. Above the soil saturation concentration, the assumptions regarding vapor transport to air and/or dissolved phase transport to groundwater (for chemicals which are liquid at ambient soil temperatures) have been violated, and alternative modeling approaches are required.
    e Calculated values correspond to a cancer risk level of 1 in 1,000,000.
    f Level is at or below Contract Laboratory Program required quantitation limit for Regular Analytical Services (RAS).
    g Chemical-specific properties are such that this route is not of concern at any soil contaminant concentration.
    h A preliminary goal of 1 ppm has been set for PCBs based on Guidance on Remedial Actions for Superfund Sites with PCB Contamination, EPA/540G-90/007, and on USEPA efforts to manage PCB contamination. See 40 CFR 761.120 - USEPA "PCB Spill Cleanup Policy." This regulation goes on to say that the remediation goal for an unrestricted area is 10 ppm and 25 ppm for a restricted area, provided both have at least 10 inches of clean cover.
    i Soil remediation objective for pH of 6.8. If soil pH is other than 6.8, refer to Appendix B, Tables C and D of this Part.
    j Ingestion soil remediation objective adjusted by a factor of 0.5 to account for dermal route.
    k A preliminary remediation goal of 400 mg/kg has been set for lead based on Revised Interim Soil Lead Guidance for CERCLA Sites and RCRA Corrective Action Facilities, OSWER Directive #9355.4-12.
    l Potential for soil-plant-human exposure.
    m The person conducting the remediation has the option to use: 1) TCLP or SPLP test results to compare with the remediation objectives listed in this Table; or 2) the total amount of contaminant in the soil sample results to compare with pH specific remediation objectives listed in Appendix B, Table C or D of this Part. (See Section 742.510.) If the person conducting the remediation wishes to calculate soil remediation objectives based on background concentrations, this should be done in accordance with Subpart D of this Part.
    n The Agency reserves the right to evaluate the potential for remaining contaminant concentrations to pose significant threats to crops, livestock, or wildlife.
    o For agrichemical facilities, remediation objectives for surficial soils which are based on field application rates may be more appropriate for currently registered pesticides. Consult the Agency for further information.
    p For agrichemical facilities, soil remediation objectives based on site-specific background concentrations of Nitrate as N may be more appropriate. Such determinations shall be conducted in accordance with the procedures set forth in Subparts D and I of this Part.

    q   The TCLP extraction must be done using water at a pH of 7.0.
    r  Value based on dietary Reference Dose.
    s  Value based on Reference Dose for Mercuric chloride (CAS No. 7487-94-7).

    t
    Note that Table value is likely to be less than background concentration for this chemical; screening or remediation concentrations using the procedures of Subpart D of this Part may be more appropriate.

    u  Value based on Reference Dose for thallium sulfate (CAS No. 7446-18-6).



    Section 742.APPENDIX B:  Tier 1 Tables and Illustrations
     
    Section 742.Table B:  Tier 1 Soil Remediation Objectivesa for Industrial/Commercial Properties
     
       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
         		  
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    ClassII
    (mg/kg)
    ADL
    (mg/kg)
    83-32-9 Acenaphthene 120,000b -----c 120,000b -----c 570b 2,900
    *
    67-64-1 Acetone 200,000b 100,000d 200,000b 100,000d 16b 16
    *
    15972-60-8 Alachloro 72e -----c 1,600e -----c 0.04 0.2
    NA
    116-06-3 Aldicarbo 2,000b -----c 200b -----c 0.013 0.07
    NA
    309-00-2 Aldrin 0.3e 6.6e 6.1b 9.3e 0.5e 2.5
    *
    120-12-7 Anthracene 610,000b -----c 610,000b -----c 12,000b 59,000
    *
    1912-24-9 Atrazineo 72,000b -----c 7,100b -----c 0.066 0.33
    NA
    71-43-2 Benzene 200e 1.5e 4,300e 2.1e 0.03 0.17
    *

       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    56-55-3 Benzo(a)anthracene 8e -----c 170e -----c 2 8
    *
    205-99-2 Benzo(b)fluoranthene 8e -----c 170e -----c 5 25
    *
    207-08-9 Benzo(k)fluroanthene 78e -----c 1,700e -----c 49 250
    *
    50-32-8 Benzo(a)pyrene 0.8e -----c 17e -----c 8 82
    *
    111-44-4 Bis(2-chloroethyl)ether 5e 0.47e 75e 0.66e 0.0004e,f 0.0004
    0.66
    117-81-7 Bis(2-ethylhexyl)phthalate 410e 31,000d 4,100b 31,000d 3,600 31,000d
    *
    75-27-4 Bromodichloromethane
    (Dichlorobromomethane)     		92e 3,000d 2,000e 3,000d 0.6 0.6
    *
    75-25-2 Bromoform 720e 100e 16,000e 140e 0.8 0.8
    *
    71-36-3 Butanol 200,000b 10,000d 200,000b 10,000d 17b 17
    NA
    85-68-7 Butyl benzyl phthalate 410,000b 930d 410,000b 930d 930d 930d
    *
    86-74-8 Carbazole 290e -----c 6,200e -----c 0.6e 2.8
    NA

       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    1563-66-2 Carbofurano 10,000b -----c 1,000b -----c 0.22 1.1
    NA
    75-15-0 Carbon disulfide 200,000b 720d 20,000b 9.0b 32b 160
    *
    56-23-5 Carbon tetrachloride 44e 0.64e 410b 0.90e 0.07 0.33
    *
    57-74-9 Chlordane 4e 38e 12b 53e 10 48
    *
    106-47-8 4 - Chloroaniline
    (p-Chloroaniline)     		8,200b -----c 820b -----c 0.7b 0.7
    1.3
    108-90-7 Chlorobenzene
    (Monochlorobenzene)     		41,000b 210b 4,100b 1.3b 1 6.5
    *
    124-48-1 Chlorodibromomethane
    (Dibromochloromethane)     		41,000b 1,300d 41,000b 1,300d 0.4 0.4
    *
    67-66-3 Chloroform 940e 0.54e 2,000b 0.76e 0.6 2.9
    *
    218-01-9 Chrysene 780e -----c 17,000e -----e 160 800
    *
    94-75-7 2,4-D 20,000b -----c 2,000b -----c 1.5 7.7
    *

       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    75-99-0 Dalapon 61,000b -----c 6,100b -----c 0.85 8.5
    1.2
    72-54-8 DDD 24e -----c 520e -----c 16e 80
    *
    72-55-9 DDE 17e -----c 370e -----c 54e 270
    *
    50-29-3 DDT 17e 1,500e 100b 2,100e 32e 160
    *
    53-70-3 Dibenzo(a,h)anthracene 0.8e -----c 17e -----c 2 7.6
    *
    96-12-8 1,2-Dibromo-3-chloropropane 4e 17b 89e 0.11b 0.002 0.002
    *
    106-93-4 1,2-Dibromoethane
    (Ethylene dibromide)     		0.07e 0.32e 1.5e 0.45e 0.0004 0.004
    0.005
    84-74-2 Di-n-butyl phthalate 200,000b 2,300d 200,000b 2,300d 2,300d 2,300d
    *
    95-50-1 1,2-Dichlorobenzene
    (o - Dichlorobenzene)     		180,000b 560d 18,000b 310b 17 43
    *
    106-46-7 1,4-Dichlorobenzene
    (p - Dichlorobenzene)     		-----c 17,000b -----c 340b 2 11
    *

       
     
    Exposure Route-Specific Values for Soils
     
    Soil
    Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    91-94-1 3,3'-Dichlorobenzidine 13e -----c 280e -----c 0.007e,f 0.033
    1.3
    75-34-3 1,1-Dichloroethane 200,000b 1,700d 200,000b 130b 23b 110
    *
    107-06-2 1,2-Dichloroethane
    (Ethylene dichloride)     		63e 0.70e 1,400e 0.99e 0.02 0.1
    *
    75-35-4 1,1-Dichloroethylene 18,000b 1,500d 1,800b 1,500d 0.06 0.3
    *
    156-59-2 cis-1,2-Dichloroethylene 20,000b 1,200d 20,000b 1,200d 0.4 1.1
    *
    156-60-5 trans-1,2-Dichloroethylene 41,000b 3,100d 41,000b 3,100d 0.7 3.4
    *
    78-87-5 1,2-Dichloropropane 84e 23b 1,800e 0.50b 0.03 0.15
    *
    542-75-6 1,3-Dichloropropene
    (1,3-Dichloropropylene, cis + trans)     		33e 0.23e 610b 0.33e 0.004e 0.02
    0.005
    60-57-1 Dieldrinn 0.4e 2.2e 7.8e 3.1e 0.004e 0.02
    0.0013
    84-66-2 Diethyl phthalate 1,000,000b 2,000d 1,000,000b 2,000d 470b 470
    *

       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    105-67-9 2,4-Dimethylphenol 41,000b -----c 41,000b -----c 9b 9
    *
    121-14-2 2,4-Dinitrotoluene 8.4e -----c 180e -----c 0.0008e,f 0.0008
    0.013
    606-20-2 2,6-Dinitrotoluene 8.4e -----c 180e -----c 0.0007e,f 0.0007
    0.0067
    117-84-0 Di-n-octyl phthalate 41,000e 10,000d 4,100b 10,000d 10,000d 10,000d
    *
    115-29-7 Endosulfan 12,000b -----c 1,200b -----c 18b 90
    *
    145-73-3 Endothallo 41,000c -----c 4,100b -----c 0.4 0.4
    NA
    72-20-8 Endrin 610b -----c 61b -----c 1 5
    *
    100-41-4 Ethylbenzene 200,000b 400d 20,000b 58b 13 19
    *
    206-44-0 Fluoranthene 82,000b -----c 82,000b -----c 4,300b 21,000
    *
    86-73-7 Fluorene 82,000b -----c 82,000b -----c 560b 2,800
    *
    76-44-8 Heptachlor 1e 11e 28e 16e 23 110
    *

       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    1024-57-3 Heptachlor epoxide 0.6e 9.2e 2.7b 13e 0.7 3.3
    *
    118-74-1 Hexachlorobenzene 4e 1.8e 78e 2.6e 2 11
    *
    319-84-6 alpha-HCH (alpha-BHC) 0.9e 1.5e 20e 2.1e 0.0005e,f 0.003
    0.002
    58-89-9 gamma-HCH (Lindane)n 4e -----c 96e -----c 0.009 0.047
    *
    77-47-4 Hexachlorocyclopentadiene 14,000b 16b 14,000b 1.1b 400 2,200d
    *
    67-72-1 Hexachloroethane 2,000b -----c 2,000b -----c 0.5b 2.6
    *
    193-39-5 Indeno(1,2,3-c,d)pyrene 8e -----c 170e -----c 14 69
    *
    78-59-1 Isophorone 410,000b 4,600d 410,000b 4,600d 8b 8
    *
    72-43-5 Methoxychlor 10,000b -----c 1,000b -----c 160 780
    *
    74-83-9 Methyl bromide
    (Bromomethane)     		2,900b 15b 1,000b 3.9b 0.2b 1.2
    *

       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    75-09-2 Methylene chloride
    (Dichloromethane)     		760e 24e 12,000b 34e 0.02e 0.2
    *
    95-48-7 2-Methylphenol
    (o - Cresol)     		100,000b -----c 100,000b -----c 15b 15
    *
    86-30-6 N-Nitrosodiphenylamine 1,200e -----c 25,000e -----c 1e 5.6
    0.66
    621-64-7 N-Nitrosodi-n-propylamine 0.8e -----c 18e -----c 0.00005e,f 0.00005
    0.66
    91-20-3 Naphthalene 82,000b -----c 8,200b -----c 84b 420
    *
    98-95-3 Nitrobenzene 1,000b 140b 1,000b 9.4b 0.1b,f 0.1
    0.26
    108-95-2 Phenol 1,000,000b -----c 120,000b -----c 100b 100
    *
    1918-02-1 Picloramo 140,000b -----c 14,000b -----c 2 20
    NA
    1336-36-3 Polychlorinated biphenyls (PCBs)n 1; 10; 25h -----c,h 1h -----c,h -----h -----h
    *
    129-00-0 Pyrene 61,000b -----c 61,000b -----c 4,200b 21,000
    *

       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    122-34-9 Simazineo 10,000b -----c 1,000b -----c 0.04 0.37
    NA
    100-42-5 Styrene 410,000b 1,500d 41,000b 430b 4 18
    *
    127-18-4 Tetrachloroethylene
    (Perchloroethylene)     		110e 20e 2,400e 28e 0.06 0.3
    *
    108-88-3 Toluene 410,000b 650d 410,000b 42b 12 29
    *
    8001-35-2 Toxaphenen 5.2e 170e 110e 240e 31 150
    *
    120-82-1 1,2,4-Trichlorobenzene 20,000b 3,200d 2,000b 920b 5 53
    *
    71-55-6 1,1,1-Trichloroethane -----c 1,200d -----c 1,200d 2 9.6
    *
    79-00-5 1,1,2-Trichloroethane 8,200b 1,800d 8,200b 1,800d 0.02 0.3
    *
    79-01-6 Trichloroethylene 520e 8.9e 1,200b 12e 0.06 0.3
    *
    108-05-4 Vinyl acetate 1,000,000b 1,600b 200,000b 10b 170b 170
    *

       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    75-01-4 Vinyl chloride 3e 0.06e 65e 0.08e 0.01f 0.07
    *
    108-38-3 m-Xylene 1,000,000 420d 410,000b 420d 210 210
    *
    95-47-6 o-Xylene 1,000,000 410d 410,000b 410d 190 190
    *
    106-42-3 p-Xylene 1,000,000 460d 410,000b 460d 200 200
    *
    1330-20-7 Xylenes (total) 1,000,000b 410d 410,000b 410d 150 150
    *
      Ionizable Organics              
    65-85-0 Benzoic Acid 1,000,000b -----c 820,000b -----c 400b,i 400i
    *
    95-57-8 2-Chlorophenol 10,000b 53,000d 10,000b 53,000d 4b,i 20i
    *
    120-83-2 2,4-Dichlorophenol 6,100b -----c 610b -----c 1b,i 1i
    *
    51-28-5 2,4-Dinitrophenol 4,100b -----c 410b -----c 0.2b,f,i 0.2i
    3.3
    88-85-7 Dinosebo 2,000b -----c 200b -----c 0.34b,i 3.4i
    *

       
     
    Exposure Route-Specific Values for Soils
     
    Soil Component of the Groundwater Ingestion Exposure Route
    		         
    Industrial-
    Commercial
    		 Construction
    Worker
    Values
    		   
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/kg)
    Class II
    (mg/kg)
    ADL
    (mg/kg)
    87-86-5 Pentachlorophenol 24e,j -----c 520e,j -----c 0.03f,i 0.14i
    2.4
    93-72-1 2,4,5-TP
    (Silvex)     		16,000b -----c 1,600b -----c 11i 55i
    *
    95-95-4 2,4,5-Trichlorophenol 200,000b -----c 200,000b -----c 270b,i 1,400i
    *
    88-06-2 2,4,6- Trichlorophenol 520e 390e 11,000e 540e 0.2e,f,i 0.77i
    0.43

     
    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route  
    Industrial-
    Commercial
    		 Construction
    Worker    		 Values  
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/L)
    Class II
    (mg/L)
         		  
      Inorganics              
    7440-36-0 Antimony 820b -----c 82b -----c 0.006m 0.024m
    *
    7440-38-2 Arsenicl,n 3e,t 1,200e 61b 25,000e 0.05m 0.2m  
    7440-39-3 Barium 140,000b 910,000b 14,000b 870,000b 2.0m 2.0m
    *
    7440-41-7 Beryllium 1e,t 2,100e 29e 44,000e 0.004m 0.5m
    *
    7440-42-8 Boron 180,000b 1,000,000 18,000b 1,000,000 2.0m 2.0m
    *
    7440-43-9 Cadmiuml,n 2,000b,r 2,800e 200b,r 59,000e 0.005m 0.05m
    *
    16887-00-6 Chloride -------c -----c -----c -----c 200m 200m
    *
    7440-47-3 Chromium, total 10,000b 420e 4,100b 8,800e 0.1m 1.0m
    *
    16065-83-1 Chromium, ion, trivalent 1,000,000b -----c 330,000b -----c -----g -----g
    *
    18540-29-9 Chromium, ion, hexavalent 10,000b 420e 4,100b 8,800e ----- -----
    *



     
    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route  
    Industrial-
    Commercial
    		 Construction
    Worker    		 Values  
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/L)
    Class II
    (mg/L)
         		  
    7440-48-4 Cobalt 120,000b -----c 12,000b -----c 1.0m 1.0m
    *
    7440-50-8 Coppern 82,000b -----c 8,200b -----c 0.65m 0.65m
    *
    57-12-5 Cyanide (amenable) 41,000b -----c 4,100b -----c 0.2q 0.6q
    *
    7782-41-4 Fluoride 120,000b -----c 12,000b -----c 4.0m 4.0m
    *
    15438-31-0 Iron -----c -----c -----c -----c 5.0m 5.0m
    *
    7439-92-1 Lead 400k -----c 400k -----c 0.0075m 0.1m
    *
    7439-96-5 Manganese 96,000b 91,000b 9,600b 8,700b 0.15m 10.0m
    *
    7439-97-6 Mercuryl,n 610b 540,000b 61b,s 52,000b 0.002m 0.01m
    *
    7440-02-0 Nickell 41,000b 21,000e 4,100b 440,000e 0.1m 2.0m
    *
    14797-55-8 Nitrate as Np 1,000,000b -----c 330,000b -----c 10.0q 100q
    *
    7782-49-2 Seleniuml,n 10,000b -----c 1,000b -----c 0.05m 0.05m
    *


     
     
    Exposure Route-Specific Values for Soils
    		 Soil Component of the Groundwater Ingestion Exposure Route  
    Industrial-
    Commercial
    		 Construction
    Worker    		 Values  
    CAS No.
    Chemical
    Name
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Ingestion
    (mg/kg)
    Inhalation
    (mg/kg)
    Class I
    (mg/L)
    Class II
    (mg/L)
         		  
    7440-22-4 Silver 10,000b -----c 1,000b -----c 0.05m -----
    *
    14808-79-8 Sulfate -----c -----c -----c -----c 400m 400m
    *
    7440-28-0 Thallium 160b,u -----c 160b,u -----c 0.002m 0.02m
    *
    7440-62-2 Vanadium 14,000b -----c 1,400b -----c 0.049m -----
    *
    7440-66-6 Zincl 610,000b -----c 61,000b -----c 5.0m 10m
    *

    "*" indicates that the ADL is less than or equal to the specified remediation objective.
    NA means Not Available; no PQL or EQL available in USEPA analytical methods.
     
     

    Chemical Name and Soil Remediation Objective Notations (2nd, 5th thru 8th Columns)
     
    a  Soil remediation objectives based on human health criteria only.
    b  Calculated values correspond to a target hazard quotient of 1.
    c  No toxicity criteria available for this route of exposure.

     
    d Soil saturation concentration (Csat)= the concentration at which the absorptive limits of the soil particles, the solubility limits of the available soil moisture, and saturation of soil pore air have been reached. Above the soil saturation concentration, the assumptions regarding vapor transport to air and/or dissolved phase transport to groundwater (for chemicals which are liquid at ambient soil temperatures) have been violated, and alternative modeling approaches are required.
    e Calculated values correspond to a cancer risk level of 1 in 1,000,000.
    f Level is at or below Contract Laboratory Program required quantitation limit for Regular Analytical Services (RAS).
    g Chemical-specific properties are such that this route is not of concern at any soil contaminant concentration.
    h A preliminary goal of 1 ppm has been set for PCBs based on Guidance on Remedial Actions for Superfund Sites with PCB Contamination, EPA/540G-90/007, and on USEPA efforts to manage PCB contamination. See 40 CFR 761.120 for USEPA "PCB Spill Cleanup Policy." This regulation goes on to say that the remediation goal for an unrestricted area is 10 ppm and 25 ppm for a restricted area, provided both have at least 10 inches of clean cover.
    i Soil remediation objective for pH of 6.8. If soil pH is other than 6.8, refer to Appendix B, Tables C and D in this Part.
    j Ingestion soil remediation objective adjusted by a factor of 0.5 to account for dermal route.
    k A preliminary remediation goal of 400 mg/kg has been set for lead based on Revised Interim Soil Lead Guidance for CERCLA Sites and RCRA Corrective Action Facilities, OSWER Directive #9355.4-12.
    l Potential for soil-plant-human exposure.
    m The person conducting the remediation has the option to use: (1) TCLP or SPLP test results to compare with the remediation objectives listed in this Table; or (2) the total amount of contaminant in the soil sample results to compare with pH specific remediation objectives listed in Appendix B, Table C or D of this Part. (See Section 742.510.) If the person conducting the remediation wishes to calculate soil remediation objectives based on background concentrations, this should be done in accordance with Subpart D of this Part.
    n The Agency reserves the right to evaluate the potential for remaining contaminant concentrations to pose significant threats to crops, livestock, or wildlife.
    o For agrichemical facilities, remediation objectives for surficial soils which are based on field application rates may be more appropriate for currently registered pesticides. Consult the Agency for further information.
    p For agrichemical facilities, soil remediation objectives based on site-specific background concentrations of Nitrate as N may be more appropriate. Such determinations shall be conducted in accordance with the located in Subparts D and I of this Part.
    q The TCLP extraction must be done using water at a pH of 7.0.
    r Value based on dietary Reference Dose.
    s Value based on Reference Dose for Mercuric chloride (CAS No. 7487-94-7).
    t Note that Table value is likely to be less than background concentration for this chemical; screening or remediation concentrations using the procedures of Subpart D of this Part.
    u Value based on Reference Dose for thallium sulfate (CAS No. 7446-18-6).



    Section 742.APPENDIX B:  Tier 1 Tables and Illustrations
     

    Section 742.Table C: pH Specific Soil Remediation Objectives for Inorganics and Ionizing Organics for the Soil Component of the Groundwater Ingestion Route (Class I Groundwater)

     
     
    Chemical (totals)
    (mg/kg)     		pH 4.5 to 4.74 pH 4.75 to 5.24 pH 5.25 to 5.74 pH 5.75 to 6.24 pH 6.25 to 6.64 pH 6.65 to 6.89 pH 6.9
    to 7.24     		pH 7.25
    to 7.74     		pH 7.75
    to 8.0
    Inorganics                  
    Antimony 5 5 5 5 5 5 5 5 5
    Arsenic 25 26 27 28 29 29 29 30 31
    Barium 260 490 850 1,200 1,500 1,600 1,700 1,800 2,100
    Beryllium 1.1 2.1 3.4 6.6 22 63 140 1,000 8,000
    Cadmium 1.0 1.7 2.7 3.7 5.2 7.5 11 59 430
    Chromium (+6) 70 62 54 46 40 38 36 32 28
    Copper 330 580 2,100 11,000 59,000 130,000 200,000 330,000 330,000
    Cyanide 40 40 40 40 40 40 40 40 40
    Mercury 0.01 0.01` 0.03 0.15 0.89 2.1 3.3 6.4 8.0
    Nickel 20 36 56 76 100 130 180 700 3,800
    Selenium 24 17 12 8.8 6.3 5.2 4.5 3.3 2.4
    Silver 0.24 0.33 0.62 1.5 4.4 8.5 13 39 110

     
    Chemical (totals)
    (mg/kg)     		pH 4.5 to 4.74 pH 4.75 to 5.24 pH 5.25 to 5.74 pH 5.75 to 6.24 pH 6.25 to 6.64 pH 6.65 to 6.89 pH 6.9
    to 7.24     		pH 7.25
    to 7.74     		pH 7.75
    to 8.0
    Thallium 1.6 1.8 2.0 2.4 2.6 2.8 3.0 3.4 3.8
    Vanadium 980 980 980 980 980 980 980 980 980
    Zinc 1,000 1,800 2,600 3,600 5,100 6,200 7,500 16,000 53,000
    Organics                  
    Benzoic Acid 440 420 410 400 400 400 400 400 400
    2-Chlorophenol 4.0 4.0 4.0 4.0 3.9 3.9 3.9 3.6 3.1
    2,4-Dichlorophenol 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0.86 0.69
    Dinoseb 8.4 4.5 1.9 0.82 0.43 0.34 0.31 0.27 0.25
    Pentachlorophenol 0.54 0.32 0.15 0.07 0.04 0.03 0.02 0.02 0.02
    2,4,5-TP (Silvex) 26 16 12 11 11 11 11 11 11
    2,4,5-Trichlorophenol 400 390 390 370 320 270 230 130 64
    2,4,6-Trichlorophenol 0.37 0.36 0.34 0.26 0.20 0.15 0.13 0.09 0.07


    Section 742.APPENDIX B

    Section 742.Table D: pH Specific Soil Remediation Objectives for Inorganics and Ionizing Organics for the Soil Component of the Groundwater Ingestion Route (Class II Groundwater)

     

    Chemical (totals)
    (mg/kg)     		pH 4.5 to 4.74 pH 4.75 to 5.24 pH 5.25 to 5.74 pH 5.75 to 6.24 pH 6.25 to 6.64 pH 6.65 to 6.89 pH 6.9
    to 7.24     		pH 7.25
    to 7.74     		pH 7.75
    to 8.0
    Inorganics                  
    Antimony 20 20 20 20 20 20 20 20 20
    Arsenic 100 100 100 110 110 120 120 120 120
    Barium 260 490 850 1,200 1,500 1,600 1,700 1,800 2,100
    Beryllium 140 260 420 820 2,800 7,900 17,000 130,000 1,000,000
    Cadmium 10 17 27 37 52 75 110 590 4,300
    Chromium (+6) No Data No Data No Data No Data No Data No Data No Data No Data No Data
    Copper 330 580 2,100 11,000 59,000 130,000 200,000 330,000 330,000
    Cyanide 120 120 120 120 120 120 120 120 120
    Mercury 0.05 0.06 0.14 0.75 4.4 10 16 32 40
    Nickel 400 730 1,100 1,500 2,000 2,600 3,500 14,000 76,000
    Selenium 24 17 12 8.8 6.3 5.2 4.5 3.3 2.4
    Thallium 16 18 20 24 26 28 30 34 38
    Zinc 2,000 3,600 5,200 7,200 10,000 12,000 15,000 32,000 110,000

    Chemical (totals)
    (mg/kg)     		pH 4.5 to 4.74 pH 4.75 to 5.24 pH 5.25 to 5.74 pH 5.75 to 6.24 pH 6.25 to 6.64 pH 6.65 to 6.89 pH 6.9
    to 7.24     		pH 7.25
    to 7.74     		pH 7.75
    to 8.0
    Organics                  
    Benzoic Acid 440 420 410 400 400 400 400 400 400
    2-Chlorophenol 20 20 20 20 20 20 19 3.6 3.1
    2,4-Dichlorophenol 1.0 1.0 1.0 1.0 1.0 1.0 1.0 0.86 0.69
    Dinoseb 84 45 19 8.2 4.3 3.4 3.1 2.7 2.5
    Pentachlorophenol 2.7 1.6 0.75 0.33 0.18 0.15 0.12 0.11 0.10
    2,4,5-TP (Silvex) 130 79 62 57 55 55 55 55 55
    2,4,5-Trichlorophenol 2,000 2,000 1,900 1,800 1,600 1,400 1,200 640 64
    2,4,6-Trichlorophenol 0.37 0.36 0.34 0.26 0.20 0.15 0.13 0.09 0.07


    Section 742.APPENDIX B:
    Tier 1 Tables and Illustrations

     

    Section 742.TABLE E: Tier 1 Groundwater Remediation Objectives for the Groundwater Component of the Groundwater Ingestion Route

     
       
    Groundwater Remediation Objective
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    83-32-9 Acenaphthene 0.42 2.1
    67-64-1 Acetone 0.7 0.7
    15972-60-8 Alachlor 0.002c 0.01c
    116-06-3 Aldicarb 0.003c 0.015c
    309-00-2 Aldrin 0.00004a 0.0002
    120-12-7 Anthracene 2.1 10.5
    1912-24-9 Atrazine 0.003c 0.015c
    71-43-2 Benzene 0.005c 0.025c
    56-55-3 Benzo(a)anthracene 0.00013a 0.00065
    205-99-2 Benzo(b)fluoranthene 0.00018a 0.0009
    207-08-9 Benzo(k)fluroanthene 0.00017a 0.00085
    50-32-8 Benzo(a)pyrene 0.0002a,c 0.002c
    111-44-4 Bis(2-chloroethyl)ether 0.01a 0.01
    117-81-7 Bis(2-ethylhexyl)phthalate 0.006a,c 0.06c
    75-27-4 Bromodichloromethane
    (Dichlorobromomethane)     		0.00002a 0.00002
    75-25-2 Bromoform 0.0002a 0.0002
    71-36-3 Butanol 0.7 0.7
    85-68-7 Butyl benzyl phthalate 1.4 7.0
    86-74-8 Carbazole --- ---
    1563-66-2 Carbofuran 0.04c 0.2c
    75-15-0 Carbon disulfide 0.7 3.5
    56-23-5 Carbon tetrachloride 0.005c 0.025c
    57-74-9 Chlordane 0.002c 0.01c

       
    Groundwater Remediation Objective
         		  
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    108-90-7 Chlorobenzene
    (Monochlorobenzene)     		0.1c 0.5c
    124-48-1 Chlorodibromomethane
    (Dibromochloromethane)     		0.14 0.14
    67-66-3 Chloroform 0.00002a 0.0001
    218-01-9 Chrysene 0.0015a 0.0075
    94-75-7 2,4-D 0.07c 0.35c
    75-99-0 Dalapon 0.2c 2.0c
    72-54-8 DDD 0.00011a 0.00055
    72-55-9 DDE 0.00004a 0.0002
    50-29-3 DDT 0.00012a 0.0006
    53-70-3 Dibenzo(a,h)anthracene 0.0003a 0.0015
    96-12-8 1,2-Dibromo-3-chloropropane 0.0002c 0.0002c
    106-93-4 1,2-Dibromoethane
    (Ethylene dibromide)     		0.00005a,c 0.0005c
    84-74-2 Di-n-butyl phthalate 0.7 3.5
    95-50-1 1,2-Dichlorobenzene
    (o - Dichlorobenzene)     		0.6c 1.5c
    106-46-7 1,4-Dichlorobenzene
    (p - Dichlorobenzene)     		0.075c 0.375c
    91-94-1 3,3'-Dichlorobenzidine 0.02a 0.1
    75-34-3 1,1-Dichloroethane 0.7 3.5
    107-06-2 1,2-Dichloroethane
    (Ethylene dichloride)     		0.005c 0.025c
    75-35-4 1,1-Dichloroethyleneb 0.007c 0.035c
    156-59-2 cis-1,2-Dichloroethylene 0.07c 0.2c
    156-60-5 trans-1,2-Dichloroethylene 0.1c 0.5c
    78-87-5 1,2-Dichloropropane 0.005c 0.025c
    542-75-6 1,3-Dichloropropene
    (1,3-Dichloropropylene, cis + trans)     		0.001a 0.005

       
    Groundwater Remediation Objective
         		  
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    60-57-1 Dieldrin 0.00002a 0.0001
    84-66-2 Diethyl phthalate 5.6 5.6
    121-14-2 2,4-Dinitrotoluenea 0.00002 0.00002
    606-20-2 2,6-Dinitrotoluenea 0.0001 0.0001
    88-85-7 Dinoseb 0.007c 0.07c
    117-84-0 Di-n-octyl phthalate 0.14 0.7
    115-29-7 Endosulfan 0.042 0.21
    145-73-3 Endothall 0.1c 0.1c
    72-20-8 Endrin 0.002c 0.01c
    100-41-4 Ethylbenzene 0.7c 1.0c
    206-44-0 Fluoranthene 0.28 1.4
    86-73-7 Fluorene 0.28 1.4
    76-44-8 Heptachlor 0.0004c 0.002c
    1024-57-3 Heptachlor epoxide 0.0002c 0.001c
    118-74-1 Hexachlorobenzene 0.00006a 0.0003
    319-84-6 alpha-HCH (alpha-BHC) 0.00003a 0.00015
    58-89-9 gamma-HCH (Lindane) 0.0002c 0.001c
    77-47-4 Hexachlorocyclopentadiene 0.05c 0.5c
    67-72-1 Hexachloroethane 0.007 0.035
    193-39-5 Indeno(1,2,3-c,d)pyrene 0.00043a 0.00215
    78-59-1 Isophorone 1.4 1.4
    72-43-5 Methoxychlor 0.04c 0.2c
    74-83-9 Methyl bromide
    (Bromomethane)     		0.0098 0.049
    75-09-2 Methylene chloride
    (Dichloromethane)     		0.005c 0.05c
    91-20-3 Naphthalene2 0.025 0.039
    98-95-3 Nitrobenzene2 0.0035 0.0035

       
    Groundwater Remediation Objective
         		  
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    1918-02-1 Picloram 0.5c 5.0c
    1336-36-3 Polychlorinated biphenyls (PCBs)n 0.0005c 0.0025c
    129-00-0 Pyrene 0.21 1.05
    122-34-9 Simazine 0.004c 0.04c
    100-42-5 Styrene 0.1c 0.5c
    93-72-1 2,4,5-TP
    (Silvex)     		0.05c 0.25c
    127-18-4 Tetrachloroethylene
    (Perchloroethylene)     		0.005c 0.025c
    108-88-3 Toluene 1.0c 2.5c
    8001-35-2 Toxaphene 0.003c 0.015c
    120-82-1 1,2,4-Trichlorobenzene 0.07c 0.7c
    71-55-6 1,1,1-Trichloroethane2 0.2c 1.0c
    79-00-5 1,1,2-Trichloroethane 0.005c 0.05c
    79-01-6 Trichloroethylene 0.005c 0.025c
    108-05-4 Vinyl acetate 7.0 7.0
    75-01-4 Vinyl chloride 0.002c 0.01c
    1330-20-7 Xylenes (total) 10.0c 10.0c
      Ionizable Organics    
    65-85-0 Benzoic Acid 28 28
    106-47-8 4-Chloroaniline
    (p-Chloroaniline)     		0.028 0.028
    95-57-8 2-Chlorophenol 0.035 0.175
    120-83-2 2,4-Dichlorophenol 0.021 0.021
    105-67-9 2,4-Dimethylphenol 0.14 0.14
    51-28-5 2,4-Dinitrophenol 0.014 0.014
    95-48-7 2-Methylphenol
    (o - Cresol)     		0.35 0.35
    86-30-6 N-Nitrosodiphenylamine 0.01a 0.05

       
    Groundwater Remediation Objective
         		  
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    621-64-7 N-Nitrosodi-n-propylamine 0.01a 0.01
    87-86-5 Pentachlorophenol 0.001a,c 0.005c
    108-95-2 Phenol 0.1c 0.1c
    95-95-4 2,4,5-Trichlorophenol 0.7 3.5
    88-06-2 2,4,6 Trichlorophenol 0.0064a 0.032
      Inorganics    
    7440-36-0 Antimony 0.006c 0.024c
    7440-38-2 Arsenic 0.05c 0.2c
    7440-39-3 Barium 2.0c 2.0c
    7440-41-7 Beryllium 0.004c 0.5c
    7440-42-8 Boron 2.0c 2.0c
    7440-43-9 Cadmium 0.005c 0.05c
    16887-00-6 Chloride 200c 200c
    7440-47-3 Chromium, total 0.1c 1.0c
    18540-29-9 Chromium, ion, hexavalent --- ---
    7440-48-4 Cobalt 1.0c 1.0c
    7440-50-8 Copper 0.65c 0.65c
    57-12-5 Cyanide 0.2c 0.6c
    7782-41-4 Fluoride 4.0c 4.0c
    15438-31-0 Iron 5.0c 5.0c
    7439-92-1 Lead 0.0075c 0.1c
    7439-96-5 Manganese 0.15c 10.0c
    7439-97-6 Mercury 0.002c 0.01c
    7440-02-0 Nickel 0.1c 2.0c
    14797-55-8 Nitrate as N 10.0c 100c
    7782-49-2 Selenium 0.05c 0.05c
    7440-22-4 Silver 0.05c ---
    14808-79-8 Sulfate 400c 400c

       
    Groundwater Remediation Objective
         		  
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    7440-28-0 Thallium 0.002c 0.02c
    7440-62-2 Vanadium2 0.049 ---
    7440-66-6 Zinc 5.0c 10c

    Chemical Name and Groundwater Remediation Objective Notations
     

    a The groundwater Health Advisory concentration is equal to ADL for carcinogens.
    b Oral Reference Dose and/or Reference Concentration under review by USEPA. Listed values subject to change.
    c Value listed is also the Groundwater Quality Standard for this chemical pursuant to 35 Ill. Adm. Code 620.410 for Class I Groundwater or 35 Ill. Adm. Code 620.420 for Class II Groundwater.

     
     


    Section 742.APPENDIX B:
    Tier 1 Tables and Illustrations

     

    Section 742.TABLE F: Values Used to Calculate the Tier 1 Soil Remediation Objectives for the Soil Component of the Groundwater Ingestion Route

     
       
    GWobj Concentration used to Calculate
    Tier 1 Soil Rememdiation Objectivesa
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    83-32-9 Acenaphthene 2.0b 10
    67-64-1 Acetone 4.0b 4.0
    15972-60-8 Alachlor 0.002c 0.01c
    116-06-3 Aldicarb 0.003c 0.015c
    309-00-2 Aldrin 5.0E-6b 2.5E-5
    120-12-7 Anthracene 10b 50
    1912-24-9 Atrazine 0.003c 0.015c
    71-43-2 Benzene 0.005c 0.025c
    56-55-3 Benzo(a)anthracene 0.0001b 0.0005
    205-99-2 Benzo(b)fluoranthene 0.0001b 0.0005
    207-08-9 Benzo(k)fluroanthene 0.001b 0.005
    50-32-8 Benzo(a)pyrene 0.0002a,c 0.002c
    111-44-4 Bis(2-chloroethyl)ether 8.0E-5b 8.0E-5
    117-81-7 Bis(2-ethylhexyl)phthalate 0.006a,c 0.06c
    75-27-4 Bromodichloromethane
    (Dichlorobromomethane)     		0.1b 0.1
    75-25-2 Bromoform 0.1b 0.01
    71-36-3 Butanol 4.0b 4.0
    85-68-7 Butyl benzyl phthalate 7.0b 35
    86-74-8 Carbazole 0.004b 0.02
    1563-66-2 Carbofuran 0.04c 0.2c
    75-15-0 Carbon disulfide 4.0b 20
    56-23-5 Carbon tetrachloride 0.005c 0.025c
    57-74-9 Chlordane 0.002c 0.01c

       
    GWobj Concentration used to Calculate
    Tier 1 Soil Rememdiation Objectivesa
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    108-90-7 Chlorobenzene
    (Monochlorobenzene)     		0.1c 0.5c
    124-48-1 Chlorodibromomethane
    (Dibromochloromethane)     		0.06b 0.06
    67-66-3 Chloroform 0.1b 0.5
    218-01-9 Chrysene 0.1b 0.05
    94-75-7 2,4-D 0.07c 0.35c
    75-99-0 Dalapon 0.2c 2.0c
    72-54-8 DDD 0.0004b 0.002
    72-55-9 DDE 0.0003b 0.0015
    50-29-3 DDT 0.0003b 0.0015
    53-70-3 Dibenzo(a,h)anthracene 1.0E-5b 5.0E-5
    96-12-8 1,2-Dibromo-3-chloropropane 0.0002c 0.0002c
    106-93-4 1,2-Dibromoethane
    (Ethylene dibromide)     		0.00005a,c 0.0005c
    84-74-2 Di-n-butyl phthalate 4.0b 20
    95-50-1 1,2-Dichlorobenzene
    (o - Dichlorobenzene)     		0.6c 1.5c
    106-46-7 1,4-Dichlorobenzene
    (p - Dichlorobenzene)     		0.075c 0.375c
    91-94-1 3,3'-Dichlorobenzidine 0.0002b 0.001
    75-34-3 1,1-Dichloroethane 4.0b 20
    107-06-2 1,2-Dichloroethane
    (Ethylene dichloride)     		0.005c 0.025c
    75-35-4 1,1-Dichloroethylene 0.007c 0.035c
    156-59-2 cis-1,2-Dichloroethylene 0.07c 0.2c
    156-60-5 trans-1,2-Dichloroethylene 0.1c 0.5c
    78-97-5 1,2-Dichloropropane 0.005c 0.025c
    542-75-6 1,3-Dichloropropene
    (1,3-Dichloropropylene, cis + trans)     		0.0005b 0.0025

       
    GWobj Concentration used to Calculate
    Tier 1 Soil Rememdiation Objectivesa
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    60-57-1 Dieldrin 5.0E-6b 2.5E-5
    84-66-2 Diethyl phthalate 30b 30
    121-14-2 2,4-Dinitrotoluene 0.0001b 0.0001
    606-20-2 2,6-Dinitrotoluene 0.0001 0.0001
    88-85-7 Dinoseb 0.007c 0.07c
    117-84-0 Di-n-octyl phthalate 0.7b 3.5
    115-29-7 Endosulfan 0.2b 1.0
    145-73-3 Endothall 0.1c 0.1c
    72-20-8 Endrin 0.002c 0.01c
    100-41-4 Ethylbenzene 0.7c 1.0c
    206-44-0 Fluoranthene 1.0b 5.0
    86-73-7 Fluorene 1.0b 5.0
    76-44-8 Heptachlor 0.0004c 0.002c
    1024-57-3 Heptachlor epoxide 0.0002c 0.001c
    118-74-1 Hexachlorobenzene 0.001b 0.005
    319-84-6 alpha-HCH (alpha-BHC) 1.0E-5b 5.0E-5
    58-89-9 gamma-HCH (Lindane) 0.0002c 0.001c
    77-47-4 Hexachlorocyclopentadiene 0.05c 0.5c
    67-72-1 Hexachloroethane 0.007 0.035
    193-39-5 Indeno(1,2,3-c,d)pyrene 0.0001b 0.0005
    78-59-1 Isophorone 1.4 1.4
    72-43-5 Methoxychlor 0.04c 0.2c
    74-83-9 Methyl bromide
    (Bromomethane)     		0.05b 0.25
    75-09-2 Methylene chloride
    (Dichloromethane)     		0.005c 0.05c
    91-20-3 Naphthalene 1.0b 5.0
    98-95-3 Nitrobenzene 0.02b 0.02

       
    GWobj Concentration used to Calculate
    Tier 1 Soil Rememdiation Objectivesa
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    1918-02-1 Picloram 0.5c 5.0c
    1336-36-3 Polychlorinated biphenyls (PCBs) --- ---
    129-00-0 Pyrene 1.0b 5.0
    122-34-9 Simazine 0.004c 0.04c
    100-42-5 Styrene 0.1c 0.5c
    93-72-1 2,4,5-TP
    (Silvex)     		0.05c 0.25c
    127-18-4 Tetrachloroethylene
    (Perchloroethylene)     		0.005c 0.025c
    108-88-3 Toluene 1.0c 2.5c
    8001-35-2 Toxaphene 0.003c 0.015c
    120-82-1 1,2,4-Trichlorobenzene 0.07c 0.7c
    71-55-6 1,1,1-Trichloroethane2 0.2c 1.0c
    79-00-5 1,1,2-Trichloroethane 0.005c 0.05c
    79-01-6 Trichloroethylene 0.005c 0.025c
    108-05-4 Vinyl acetate 40b 40
    75-01-4 Vinyl chloride 0.002c 0.01c
    1330-20-7 Xylenes (total) 10.0c 10.0c
      Ionizable Organics    
    65-85-0 Benzoic Acid 100b 100
    106-47-8 4-Chloroaniline
    (p-Chloroaniline)     		0.1b 0.1
    95-57-8 2-Chlorophenol 0.2b 1.0
    120-83-2 2,4-Dichlorophenol 0.1b 0.1
    105-67-9 2,4-Dimethylphenol 0.7b 0.7
    51-28-5 2,4-Dinitrophenol 0.04b 0.04
    95-48-7 2-Methylphenol
    (o - Cresol)     		2.0b 2.0
    86-30-6 N-Nitrosodiphenylamine 0.02b 0.1

       
    GWobj Concentration used to Calculate
    Tier 1 Soil Rememdiation Objectivesa
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    621-64-7 N-Nitrosodi-n-propylamine 1.0E-5b 1.0E-5
    87-86-5 Pentachlorophenol 0.001a,c 0.005c
    108-95-2 Phenol 0.1c 0.1c
    95-95-4 2,4,5-Trichlorophenol 4.0b 20
    88-06-2 2,4,6-Trichlorophenol 0.008b 0.04
      Inorganics    
    7440-36-0 Antimony 0.006c 0.024c
    7440-38-2 Arsenic 0.05c 0.2c
    7440-39-3 Barium 2.0c 2.0c
    7440-41-7 Beryllium 0.004c 0.5c
    7440-42-8 Boron 2.0c 2.0c
    7440-43-9 Cadmium 0.005c 0.05c
    16887-00-6 Chloride 200c 200c
    7440-47-3 Chromium, total 0.1c 1.0c
    18540-29-9 Chromium, ion, hexavalent --- ---
    7440-48-4 Cobalt 1.0c 1.0c
    7440-50-8 Copper 0.65c 0.65c
    57-12-5 Cyanide 0.2c 0.6c
    7782-41-4 Fluoride 4.0c 4.0c
    15438-31-0 Iron 5.0c 5.0c
    7439-92-1 Lead 0.0075c 0.1c
    7439-96-5 Manganese 0.15c 10.0c
    7439-97-6 Mercury 0.002c 0.01c
    7440-02-0 Nickel 0.1c 2.0c
    14797-55-8 Nitrate as N 10.0c 100c
    7782-49-2 Selenium 0.05c 0.05c
    7440-22-4 Silver 0.05c ---
    14808-79-8 Sulfate 400c 400c

       
    GWobj Concentration used to Calculate
    Tier 1 Soil Rememdiation Objectivesa
    CAS No.
    		Chemical Name
    Class I
    (mg/L)
    Class II
    (mg/L)
    7440-28-0 Thallium 0.002c 0.02c
    7440-62-2 Vanadium 0.049 ---
    7440-66-6 Zinc 5.0c 10c

    Chemical Name and Groundwater Remediation Objective Notations
     

     
    a The Equation S17 is used to calculate the Soil Remediation Objective for the Soil Component of the Groundwater Ingestion Route; this equation requires calculation of the Target Soil Leachate Concentration (Cw) from Equation S18: Cw = DF x GWobj.
    b Value listed is the Water Health Based Limit (HBL) for this chemical from Soil Screening Guidance: User’s Guide, incorporated by reference at Section 742.210; for carcinogens, the HBL is equal to a cancer risk of 1.0E-6, and for noncarcinogens is equal to a Hazard Quotient of 1.0. NOTE: These GWobj concentrations are not equal to the Tier 1 Groundwater Remediation Objectives for the Direct Ingestion of Groundwater Component of the Groundwater Ingestion Route, listed in Section 742.Appendix B, Table E.
    c Value listed is also the Groundwater Quality Standard for this chemical pursuant to 35 Ill. Adm. Code 620.410 for Class I Groundwater or 35 Ill. Adm. Code 620.420 for Class II Groundwater.

     



    Section 742.APPENDIX C:  Tier 2 Tables and Illustrations
     



    Section 742.Illustration A: Tier 2 Evaluation for Soil

      



    Section 742.APPENDIX C:  Tier 2 Tables and Illustrations
     



    Section 742.Illustration B: Tier 2 Evaluation for Groundwater
     

     



    Section 742.APPENDIX C:  Tier 2 Tables and Illustrations
     
    Section 742.Illustration C: U.S. Department of Agriculture Soil Texture Classification
     

     

     


    Section 742.APPENDIX C:
    Tier 2 Tables and Illustrations

     



    Section 742.Table A:  SSL Equations
     
    Equations for Soil Ingestion Exposure Route Remediation Objectives for Noncarcinogenic Contaminants
    (mg/kg)
    		 
     
    S1
      Remediation Objectives for Carcinogenic Contaminants - Residential
    (mg/kg)
    		 
     
    S2
      Remediation Objectives for Carcinogenic
    Contaminants - Industrial/ Commercial, Construction Worker
    (mg/kg)
    		 
     
    S3
    Equations for Inhalation Exposure Route (Volatiles)

     

    		Remediation Objectives for Noncarcinogenic Contaminants - Residential, Industrial/Commercial (mg/kg)
    		 
     
    S4

      Remediation Objectives for Noncarcinogenic Contaminants - Construction Worker (mg/kg)
    		 
     
    S5
      Remediation Objectives for Carcinogenic Contaminants - Residential, Industrial/ Commercial (mg/kg)
    		 
     
    S6
      Remediation Objectives for Carcinogenic Contaminants - Construction Worker (mg/kg)

     

    		 
     
    S7
      Equation for Derivation of the Volatilization Factor - Residential, Industrial/ Commercial, VF (m3/kg)
    		 
     
    S8
      Equation for Derivation of the Volatilization Factor - Construction Worker, VF ¢ (m3/kg)
    		 
     
    S9
      Equation for Derivation
    of Apparent Diffusivity, DA (cm2/s)
    		 
     
    S10

    Equations for Inhalation Exposure Route (Fugitive Dusts) Remediation Objectives for Noncarcinogenic Contaminants - Residential, Industrial/Commercial (mg/kg)
    		 
     
    S11
      Remediation Objectives for Noncarcinogenic Contaminants - Construction Worker (mg/kg)
    		 
     
    S12
     
      Remediation Objectives for Carcinogenic Contaminants - Residential, Industrial/ Commercial (mg/kg)
    		 
     
    S13
     
      Remediation Objectives for Carcinogenic Contaminants - Construction Worker (mg/kg)
    		 
     
    S14
     
      Equation for Derivation of Particulate Emission Factor, PEF (m3/kg)
    		 
     
    S15


     
      Equation for Derivation of Particulate Emission Factor, PEF ¢ - Construction Worker (m3/kg)

    NOTE: PEF must be the industrial/commercial value

    		 
    S16
     
    Equations for the Soil Component of the Groundwater Ingestion Exposure Route Remediation Objective
    (mg/kg)

    NOTE: This equation can only be used to model contaminant migration not in the water bearing unit.

    		 
    S17
      Target Soil Leachate Concentration, Cw
    (mg/L)     		 

    		  
    S18
      Soil-Water Partition Coefficient, Kd
    (cm3/g)
    		 

    S19

      Water-Filled Soil Porosity, q w
    (Lwater/Lsoil)
    		 
    S20
      Air-Filled Soil Porosity, q a
    (Lair/Lsoil)
    		 
    S21
      Dilution Factor, DF (unitless)
    		 
    S22


     
      Groundwater Remediation Objective for Carcinogenic Contaminants, GWobj
    (mg/L)
    		 

    S23

      Total Soil Porosity, h
    (Lpore/Lsoil)
    		 

    S24

      Equation for Estimation of Mixing Zone Depth, d
    (m)
    		 

    S25

    Mass-Limit Equations for Inhalation Exposure Route and Soil Component of the Groundwater Ingestion Exposure Route Mass-Limit Volatilization Factor for the Inhalation Exposure Route - Residential, Industrial/ Commercial, VF (m3/kg)

    NOTE: This equation may be used when area and depth of contaminant source are known or can be estimated reliably.

    		 
     
    S26
      Mass-Limit Volatilization Factor for Inhalation Exposure Route - Construction Worker, VF ¢ - (m3/kg)
     

    		 
     
    S27


     
      Mass-Limit Remediation Objective for Soil Component of the Groundwater Ingestion Exposure Route (mg/kg)

     

    NOTE: This equation may be used when area and depth of contaminant source are known or can be estimated reliably.

    		 
     
    S28
    Equation for Derivation of the Soil Saturation Limit, Csat

     

    		 
    S29

     


    Section 742.APPENDIX C:
    Tier 2 Tables and Illustrations

     



    Section 742.Table B:    SSL Parameters
     
    Symbol Parameter Units Source Parameter Value(s)
    AT Averaging Time for Noncarcinogens in Ingestion Equation yr   Residential = 6
    Industrial/Commercial = 25
    Construction Worker = 0.115
    AT Averaging Time for Noncarcinogens in Inhalation Equation yr   Residential = 30
    Industrial/Commercial = 25
    Construction Worker = 0.115
    ATc Averaging Time for Carcinogens yr SSL 70
    BW Body Weight kg   Residential = 15, noncarcinogens
    70, carcinogens
    Industrial/Commercial = 70
    Construction Worker = 70
    Csat Soil Saturation Concentration mg/kg Appendix A, Table A or
    Equation S29 in
    Appendix C, Table A     		Chemical-Specific or
    Calculated Value
    Cw Target Soil Leachate Concentration mg/L Equation S18 in
    Appendix C, Table A     		Groundwater Standard, Health Advisory concentration, or
    Calculated Value
    d Mixing Zone Depth m SSL or
    Equation S25 in
    Appendix C, Table A     		2 m or
    Calculated Value
    da Aquifer Thickness m Field Measurement Site-Specific

    Symbol Parameter Units Source Parameter Value(s)
    ds Depth of Source m Field Measurement or Estimation Site-Specific
    DA Apparent Diffusivity cm2/s Equation S10 in
    Appendix C, Table A     		Calculated Value
    Di Diffusivity in Air cm2/s Appendix C, Table E Chemical-Specific
    Dw Diffusivity in Water cm2/s Appendix C, Table E Chemical-Specific
    DF Dilution Factor unitless Equation S22 in
    Appendix C, Table A     		20 or Calculated Value
    ED Exposure Duration for Ingestion of Carcinogens yr   Industrial/Commercial = 25
    Construction Worker = 1
    ED Exposure Duration for Inhalation of Carcinogens yr   Residential = 30
    Industrial/Commercial = 25
    Construction Worker = 1
    ED Exposure Duration for Ingestion of Noncarcinogens yr   Residential = 6
    Industrial/Commercial = 25
    Construction Worker = 1
    ED Exposure Duration for Inhalation of Noncarcinogens yr   Residential = 30
    Industrial/Commercial = 25
    Construction Worker = 1
    ED Exposure Duration for the Direct Ingestion of Groundwater yr   Residential = 30
    Industrial/Commercial = 25
    Construction Worker = 1

    Symbol Parameter Units Source Parameter Value(s)
    EDM-L Exposure Duration for Migration to Groundwater Mass-Limit Equation S28 yr SSL 70
    EF Exposure Frequency d/yr   Residential = 350
    Industrial/Commercial = 250
    Construction Worker = 30
    F(x)   Function dependent on Um/Ut unitless SSL 0.194
    foc Organic Carbon Content of Soil g/g SSL or
    Field Measurement
    (See Appendix C, Table F)     		Surface Soil = 0.006
    Subsurface soil = 0.002, or
     
    Site-Specific  
    GWobj Groundwater Remediation Remediation Objective mg/L Appendix B, Table E,
    35 IAC 620.Subpart F, or Equation S23 in
    Appendix C, Table A     		Chemical-Specific or Calculated
    H' Henry's Law Constant unitless Appendix C, Table E Chemical-Specific
    i Hydraulic Gradient m/m Field Measurement
    (See Appendix C, Table F)     		Site-Specific
    I Infiltration Rate m/yr SSL 0.3
    IM-L Infiltration Rate for Migration to Groundwater Mass-Limit Equation S28 m/yr SSL 0.18

    Symbol Parameter Units Source Parameter Value(s)
    IFsoil-adj

    (residential)

    		Age Adjusted Soil Ingestion Factor for Carcinogens (mg-yr)/(kg-d) SSL 114
    IRsoil Soil Ingestion Rate mg/d   Residential = 200
    Industrial/Commercial = 50
    Construction Worker = 480
    IRW Daily Water Ingestion Rate L/d   Residential = 2
    Industrial/Commercial = 1
    K Aquifer Hydraulic Conductivity m/yr Field Measurement
    (See Appendix C, Table F)     		Site-Specific
    Kd Soil-Water Partition Coefficient cm3/g or L/kg Equation S19 in
    Appendix C, Table A     		Calculated Value
    Koc Organic Carbon Partition Coefficient cm3/g or L/kg Appendix C, Table E
    or Appendix C, Table I     		Chemical-Specific
    Ks Saturated Hydraulic Conductivity m/yr Appendix C, Table K
    Appendix C, Illustration C     		Site-Specific
    L Source Length Parallel to Groundwater Flow m Field Measurement Site-Specific
    PEF Particulate Emission
    Factor     		m3/kg SSL or Equation S15 in Appendix C, Table A Residential = 1.32 · 109 or Site-Specific
    Industrial/Commercial = 1.24 · 109 or Site-Specific
    PEF ¢ Particulate Emission Factor adjusted for Agitation (construction worker) m3/kg Equation S16 in Appendix C, Table A using PEF (industrial/commercial) 1.24 · 108 or Site-Specific

    Symbol Parameter Units Source Parameter Value(s)
    Q/C
    (used in VF equations)     		Inverse of the mean concentration at the center of a square source (g/m2-s)/(kg/m3) Appendix C, Table H Residential = 68.81
    Industrial/Commercial = 85.81
    Construction Worker = 85.81
     
    Q/C
    (used in PEF equations)     		Inverse of the mean concentration at the center of a square source (g/m2-s)/(kg/m3) SSL or Appendix C, Table H Residential = 90.80
    Industrial/Commercial = 85.81
    Construction Worker = 85.81
    RfC Inhalation Reference Concentration mg/m3 IEPA (IRIS/HEASTa) Toxicological-Specific
    (Note: for Construction Workers use subchronic reference concentrations)
    RfDo Oral Reference Dose mg/(kg-d) IEPA (IRIS/HEASTa) Toxicological-Specific
    (Note: for Construction Worker use subchronic reference doses)
    S Solubility in Water mg/L Appendix C, Table E Chemical-Specific
    SFo Oral Slope Factor (mg/kg-d)-1 IEPA (IRIS/HEASTa) Toxicological-Specific
    T Exposure Interval s   Residential = 9.5 · 108
    Industrial/Commercial = 7.9 · 108
    Construction Worker = 3.6 · 106
    TM-L Exposure Interval for Mass-Limit Volatilization Factor Equation S26 yr SSL 30
    THQ Target Hazard Quotient unitless SSL 1


     
    Symbol Parameter Units Source Parameter Value(s)
    TR Target Cancer Risk unitless   Residential = 10-6 at the point of human exposure
    Industrial/Commercial = 10-6 at the point of human exposure
    Construction Worker = 10-6 at the point of human exposure
    Um Mean Annual Windspeed m/s SSL 4.69
    URF Inhalation Unit Risk Factor ( m g/m3)-1 IEPA (IRIS/HEASTa) Toxicological-Specific
    Ut Equivalent Threshold Value of Windspeed at 7 m m/s SSL 11.32
    V Fraction of Vegetative Cover unitless SSL or Field Measurement 0.5 or Site-Specific
    VF Volatilization Factor m3/kg Equation S8 in
    Appendix C, Table A     		Calculated Value
    VF ¢ Volatilization Factor adjusted for Agitation m3/kg Equation S9 in
    Appendix C, Table A     		Calculated Value
    VFM-L Mass-Limit Volatilization Factor m3/kg Equation S26 in
    Appendix C, Table A     		Calculated Value
    VF ¢ M-L Mass-Limit Volatilization Factor adjusted for Agitation m3/kg Equation S27 in
    Appendix C, Table A     		Calculated Value


     
    Symbol Parameter Units Source Parameter Value(s)
    h     Total Soil Porosity Lpore/Lsoil SSL or
    Equation S24 in
    Appendix C, Table A     		0.43, or
     
    Gravel = 0.25
    Sand = 0.32
    Silt = 0.40
    Clay = 0.36, or
     
    Calculated Value
    q a Air-Filled Soil Porosity Lair/Lsoil SSL or
    Equation S21 in
    Appendix C, Table A     		Surface Soil (top 1 meter) = 0.28
    Subsurface Soil (below 1 meter) = 0.13, or
     
    Gravel = 0.05
    Sand = 0.14
    Silt - 0.24
    Clay = 0.19, or
     
    Calculated Value
    q w Water-Filled Soil Porosity Lwater/Lsoil SSL or
    Equation S20 in
    Appendix C, Table A     		Surface Soil (top 1 meter) = 0.15
    Subsurface Soil (below 1 meter) = 0.30, or
     
    Gravel = 0.20
    Sand = 0.18
    Silt = 0.16
    Clay = 0.17, or
     
    Calculated Value  

    Symbol Parameter Units Source Parameter Value(s)
    r b Dry Soil Bulk Density kg/L or g/cm3 SSL or
    Field Measurement
    (See Appendix C, Table F)     		1.5, or

    Gravel = 2.0
    Sand = 1.8
    Silt = 1.6
    Clay = 1.7, or

    Site-Specific

    r s Soil Particle Density g/cm3 SSL or
    Field Measurement
    (See Appendix C, Table F)     		2.65, or

    Site-Specific

    r w Water Density g/cm3 SSL 1
    1/(2b+3) Exponential in Equation S20 unitless Appendix C, Table K
    Appendix C, Illustration C     		Site-Specific
    a HEAST = Health Effects Assessment Summary Tables. USEPA, Office of Solid Waste and Emergency Response. EPA/SQO/R-95/036. Updated Quarterly.

     
     



    Section 742.Appendix C:  Tier 2 Tables and Illustrations
     



    Section 742.Table C:  RBCA Equations
     
    Equations for the combined exposures routes of soil ingestion Remediation Objectives for Carcinogenic Contaminants (mg/kg)
    		 
     
     
    R1
    inhalation of vapors and particulates, and dermal contact with soil Remediation Objectives for Non-carcinogenic Contaminants (mg/kg)
    		 
     
     
    R2
      Volatilization Factor for Surficial Soils, VFss
    (kg/m3)
     
    Whichever is less between R3 and R4     		 

     

    		 
     
     
    R3
       
    		 
     
    R4

     

     
      Volatilization Factor for Surficial Soils Regarding Particulates, VFp
    (kg/m3)
    		 
     
    R5
      Effective Diffusion Coefficient in Soil Based on Vapor-Phase Concentration Dseff
    (cm2/s)     		 

     

    		 
     
     
    R6
    Equations for the ambient vapor inhalation (outdoor) Remediation Objectives for Carcinogenic Contaminants (mg/kg)
    		 
    R7
    route from subsurface soils Remediation Objectives for Non-carcinogenic Contaminants (mg/kg)
     

     

    		 
     
    R8

      Carcinogenic Risk-Based Screening Level for Air, RBSLair
    (ug/m3)
    		 
     
    R9
      Noncarcinogenic Risk-Based Screening Level for Air, RBSLair
    (ug/m3)
    		 
     
     
    R10
      Volatilization Factor - Subsurface Soil to Ambient Air, VFsamb

     
    (mg/m3)/(mg/kgsoil)
     

    		 

    		  
     
     
     
    R11

    Equations for the Soil Component of the Groundwater Remediation Objective
    (mg/kg)

    NOTE: This equation can only be used to model contaminant migration not in the water bearing unit.

    		 
     
    R12
    Ingestion Exposure Route Groundwater at the source, GWsource
    (mg/L)
     
    		 
     
    R13
      Leaching Factor,
    LFsw
     
     
    (mg/Lwater)/(mg/kgsoil)
     
    		 
     
     
    R14
      Steady-State Attenuation Along the Centerline of a Dissolved Plume,
    C(x)/Csource
    NOTE:
    1. This equation does not predict the contaminant flow within bedrock.
    2. If the value of the First Order Degradation Constant ( l ) is not readily available, then set l = 0.     		 
     
     
    R15
      Longitudinal Dispersivity, a x
    (cm)
    		 
     
    R16

      Transverse Dispersivity, a y
    (cm)
    		 
    R17
      Vertical Dispersivity, a z
    (cm)
    		 
    R18
      Specific Discharge, U
    (cm/d)
    		 
    R19
      Soil-Water Sorption Coefficient, ks
    		 
    R20
      Volumetric Air Content in Vadose Zone Soils, q as
    (cm3air/cm3soil)
    		 
     
    R21
      Volumetric Water Content in Vadose Zone Soils, q ws
    (cm3water/cm3soil)
    		 
     
    R22
      Total Soil Porosity, q T
    (cm3/cm3soil)
    		 
    R23

      Groundwater Darcy Velocity, Ugw
    (cm/yr)
    		 
    R24
    Equations for the Groundwater Ingestion Exposure Route Remediation Objective for Carcinogenic Contaminants
    (mg/L)
     

     

    		 
     
    R25
      Dissolved Hydrocarbon Concentration along Centerline, C(x)
    (g/cm3water)

     
    NOTE:

    1.  This equation does not predict the contaminant flow within bedrock.

    2.  If the value of the First Order Degradation Constant ( l ) is not readily available, then set l = 0.

    		 
     
    R26


     


    Section 742.APPENDIX C:
    Tier 2 Tables and Illustrations

     



    Section 742.Table D:  RBCA Parameters
     
    Symbol Parameter Units Source Parameter Value(s)
    ATc Averaging Time for Carcinogens yr RBCA 70
    ATn Averaging Time for Noncarcinogens yr RBCA Residential = 30
    Industrial/Commercial = 25
    Construction Worker = 0.115
    BW Adult Body Weight kg RBCA 70
    Csource The greatest potential concentration of the contaminant of concern in the groundwater at the source of the contamination, based on the concentrations of contaminants in groundwater due to the release and the projected concentration of the contaminant migrating from the soil to the groundwater. mg/L Field Measurement Site-Specific
    C(x) Concentration of Contaminant in Groundwater at Distance X from the source mg/L Equation R26 in
    Appendix C, Table C     		Calculated Value

    Symbol Parameter Units Source Parameter Value(s)
    C(x)/Csource Steady-State Attenuation Along the Centerline of a Dissolved Plume unitless Equation R15 in
    Appendix C, Table C     		Calculated Value
    d Lower Depth of Surficial Soil Zone cm Field Measurement 100 or
    Site-Specific (not to exceed 100)
    Dair Diffusion Coefficient in Air cm2/s Appendix C, Table E Chemical-Specific
    Dwater Diffusion Coefficient in Water cm2/s Appendix C, Table E Chemical-Specific
    Dseff Effective Diffusion Coefficient in Soil Based on Vapor-Phase Concentration cm2/s Equation R6 in
    Appendix C, Table C     		Calculated Value
    ED Exposure Duration yr RBCA Residential = 30
    Industrial/Commercial = 25
    Construction Worker = 1
    EF Exposure Frequency d/yr RBCA Residential = 350
    Industrial/Commercial = 250
    Construction Worker = 30
    erf Error Function unitless Appendix C, Table G Mathematical Function

    Symbol Parameter Units Source Parameter Value(s)
    foc Organic Carbon Content of Soil g/g RBCA or
    Field Measurement
    (See Appendix C, Table F)     		Surface Soil = 0.006
    Subsurface Soil = 0.002 or
     
    Site-Specific
    GWcomp Groundwater Objective at the Compliance Point mg/L Appendix B, Table E,
    35 IAC 620.Subpart F, or
    Equation R25 in Appendix C, Table C     		Site-Specific
    GWsource Groundwater Concentration at the Source mg/L Equation R13 in
    Appendix C, Table C     		Calculated Value
    H’ Henry’s Law Constant cm3water/cm3air Appendix C, Table E Chemical-Specific
    i Hydraulic Gradient cm/cm (unitless) Field Measurement
    (See Appendix C, Table F)     		Site-Specific
    I Infiltration Rate cm/yr RBCA 30
    IRair Daily Outdoor Inhalation Rate m3/d RBCA 20
    IRsoil Soil Ingestion Rate mg/d RBCA Residential = 100
    Industrial/Commercial = 50
    Construction Worker = 480
    IRw Daily Water Ingestion Rate L/d RBCA Residential = 2
    Industrial/Commercial = 1

    Symbol Parameter Units Source Parameter Value(s)
    K Aquifer Hydraulic Conductivity cm/d for Equations R15, R19 and R26
    cm/yr for Equation R24     		Field Measurement
    (See Appendix C, Table F)     		Site-Specific
    Koc Organic Carbon Partition Coefficient cm3/g or L/kg Appendix C, Table E or
    Appendix C, Table I     		Chemical-Specific
    ks
    (non-ionizing organics)     		Soil Water Sorption Coefficient cm3water/gsoil Equation R20 in
    Appendix C,Table C     		Calculated Value
    ks
    (ionizing organics)     		Soil Water Sorption Coefficient cm3water/gsoil Equation R20 in Appendix C, Table C Chemical-Specific
    ks
    (inorganics)     		Soil Water Sorption Coefficient cm3water/gsoil Appendix C, Table J Chemical-Specific
    Ls Depth to Subsurface Soil Sources cm RBCA 100
    LF sw Leaching Factor (mg/Lwater)/
    (mg/kgsoil)     		Equation R14 in
    Appendix C, Table C     		Calculated Value
    M Soil to Skin Adherence Factor mg/cm2 RBCA 0.5

    Symbol Parameter Units Source Parameter Value(s)
    Pe Particulate Emission Rate g/cm2-s RBCA 6.9 · 10-14
    RAFd

     

    		Dermal Relative Absorption Factor unitless RBCA 0.5
    RAFd
    (PNAs)     		Dermal Relative Absorption Factor unitless RBCA 0.05
    RAFd
    (inorganics)     		Dermal Relative Absorption Factor unitless RBCA 0
    RAFo Oral Relative Absorption Factor unitless RBCA 1.0
    RBSLair Carcinogenic
    Risk-Based Screening Level for Air     		m g/m3 Equation R9 in
    Appendix C, Table C     		Chemical-, Media-, and Exposure Route-Specific
    RBSLair Noncarcinogenic
    Risk-Based Screening Level for Air     		m g/m3 Equation R10 in
    Appendix C, Table C     		Chemical-, Media-, and Exposure Route-Specific
    RfDi Inhalation Reference Dose mg/kg-d IEPA (IRIS/HEASTa) Toxicological-Specific
    RfDo Oral Reference Dose mg/(kg-d) IEPA (IRIS/HEASTa) Toxicological-Specific
    (Note: for Construction Worker use subchronic reference doses)
    SA Skin Surface Area cm2/d RBCA 3,160

    Symbol Parameter Units Source Parameter Value(s)
    Sd Source Width Perpendicular to Groundwater Flow Direction in Vertical Plane cm Field Measurement For Migration to Groundwater Route:
    Use 200 or Site-Specific
     
    For Groundwater remediation objective:
    Use Site-Specific
    Sw Source Width Perpendicular to Groundwater Flow Direction in Horizontal Plane cm Field Measurement Site-Specific
    SFi Inhalation Cancer Slope Factor (mg/kg-d)-1 IEPA (IRIS/HEASTa) Toxicological-Specific
    SFo Oral Slope Factor (mg/kg-d)-1 IEPA (IRIS/HEASTa) Toxicological-Specific
    THQ Target Hazard Quotient unitless RBCA 1
    TR Target Cancer Risk unitless RBCA Residential = 10-6 at the point of human exposure
    Industrial/Commercial = 10-6 at the point of human exposure
    Construction Worker = 10-6 at the point of human exposure
    U Specific Discharge cm/d Equation R19 in
    Appendix C, Table C     		Calculated Value


     
    Symbol Parameter Units Source Parameter Value(s)
    Uair Average Wind Speed Above Ground Surface in Ambient Mixing Zone cm/s RBCA 225
    Ugw Groundwater Darcy Velocity cm/yr Equation R24 in
    Appendix C, Table C     		Calculated Value
    VF p Volatilization Factor for Surficial Soils Regarding Particulates kg/m3 Equation R5 in
    Appendix C, Table C     		Calculated Value
    VFsamb Volatilization Factor (Subsurface Soils to Ambient Air) (mg/m3air)/(mg/
    kgsoil) or kg/m3     		Equation R11 in
    Appendix C, Table C     		Calculated Value
    VFss Volatilization Factor for Surficial Soils kg/m3 Use Equations R3 and R4 in Appendix C, Table C Calculated Value from Equation R3 or R4 (whichever is less)
    W Width of Source Area Parallel to Direction to Wind or Groundwater Movement cm Field Measurement Site-Specific


     
    Symbol Parameter Units Source Parameter Value(s)
    w Average Soil Moisture Content gwater/gsoil RBCA or
    Field Measurement
    (See Appendix C, Table F)     		0.1, or
     
    Surface Soil (top 1 meter) = 0.1
    Subsurface Soil (below 1 meter) = 0.2, or
     
    Site-Specific
    X Distance along the Centerline of the Groundwater Plume Emanating from a Source. The x direction is the direction of groundwater flow cm Field Measurement Site-Specific
    a x Longitudinal Dispersitivity cm Equation R16 in
    Appendix C, Table C     		Calculated Value
    a y Transverse Dispersitivity cm Equation R17 in
    Appendix C, Table C     		Calculated Value
    a z Vertical Dispersitivity cm Equation R18 in
    Appendix C, Table C     		Calculated Value
    d air Ambient Air Mixing Zone Height cm RBCA 200

    Symbol Parameter Units Source Parameter Value(s)
    d gw Groundwater Mixing Zone Thickness cm RBCA 200
    q as Volumetric Air Content in Vadose Zone Soils cm3air/cm3soil RBCA or
    Equation R21 in
    Appendix C, Table C     		Surface Soil (top 1 meter) = 0.28
    Subsurface Soil (below 1 meter)= 0.13,
    or
     
    Gravel = 0.05
    Sand = 0.14
    Silt = 0.16
    Clay = 0.17, or
     
    Calculated Value
    q ws Volumetric Water Content in Vadose Zone Soils cm3water/cm3soil RBCA or
    Equation R22 in
    Appendix C, Table C     		Surface Soil (top 1 meter) = 0.15
    Subsurface Soil (below 1 meter) =
    0.30,
    or
     
    Gravel = 0.20
    Sand = 0.18
    Silt = 0.16
    Clay = 0.17, or
     
    Calculated Value

    Symbol Parameter Units Source Parameter Value(s)
    q T Total Soil Porosity cm3/cm3soil RBCA or
    Equation R23 in
    Appendix C, Table C     		0.43, or
     
    Gravel = 0.25
    Sand = 0.32
    Silt = 0.40
    Clay = 0.36, or
     
    Calculated Value
    l First Order Degradation Constant d-1 Appendix C, Table E Chemical-Specific
    p pi     3.1416
    r s Soil Bulk Density g/cm3 RBCA or
    Field Measurement
    (See Appendix C, Table F)     		1.5, or
     
    Gravel = 2.0
    Sand = 1.8
    Silt = 1.6
    Clay = 1.7, or
     
    Site-Specific
    r w Water Density g/cm3 RBCA 1
    t Averaging Time for Vapor Flux s RBCA 9.46 · 108
    a HEAST = Health Effects Assessment Summary Tables. USEPA, Office of Solid Waste and Emergency Response. EPA/540/R-95/036. Updated Quarterly.

     
     

     


    Section 742.APPENDIX C:
    Tier 2 Tables and Illustrations

     



    Section 742.Table E:    Default Physical and Chemical Parameters
     
     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    Neutral Organics              
    83-32-9 Acenaphthene 4.24 0.0421 7.69E-6 0.00636 7,080 0.0034
    67-64-1 Acetone 1,000,000 0.124 1.14E-5 0.00159 0.575 0.0495
    15972-60-8 Alachlor 242 0.0198 5.69E-6 0.00000132 394 No Data
    116-06-3 Aldicarb 6,000 0.0305 7.19E-6 0.0000000574 12 0.00109
    309-00-2 Aldrin 0.18 0.0132 4.86E-6 0.00697 2,450,000 0.00059
    120-12-7 Anthracene 0.0434 0.0324 7.74E-6 0.00267 29,500 0.00075
    1912-24-9 Atrazine 70 0.0258 6.69E-6 0.00000005 451 No Data
    71-43-2 Benzene 1,750 0.088 9.80E-6 0.228 58.9 0.0009

     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    56-55-3 Benzo(a)anthracene 0.0094 0.0510 9.00E-6 0.000137 398,000 0.00051
    205-99-2 Benzo(b)fluoranthene 0.0015 0.0226 5.56E-6 0.00455 1,230,000 0.00057
    207-08-9 Benzo(k)fluoranthene 0.0008 0.0226 5.56E-6 0.000034 1,230,000 0.00016
    65-85-0 Benzoic Acid 3,500 0.0536 7.97E-6 0.0000631 0.600 No Data
    50-32-8 Benzo(a)pyrene 0.00162 0.043 9.00E-6 0.0000463 1,020,000 0.00065
    111-44-4 Bis(2-chloroethyl)ether 17,200 0.0692 7.53E-6 0.000738 15.5 0.0019
    117-81-7 Bis(2-ethylhexyl)phthalate 0.34 0.0351 3.66E-6 0.00000418 15,100,000 0.0018
    75-27-4 Bromodichloromethane 6,740 0.0298 1.06E-5 0.0656 55.0 No Data
    75-25-2 Bromoform 3,100 0.0149 1.03E-5 0.0219 87.1 0.0019
    71-36-3 Butanol 74,000 0.0800 9.30E-6 0.000361 6.92 0.01283
    85-68-7 Butyl Benzyl Phthalate 2.69 0.0174 4.83E-6 0.0000517 57,500 0.00385
    86-74-8 Carbazole 7.48 0.0390 7.03E-6 0.000000626 3,390 No Data

     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    1563-66-2 Carbofuran 320 0.0249 6.63E-6 .00377 37 No Data
    75-15-0 Carbon Disulfide 1,190 0.104 1.00E-5 1.24 45.7 No Data
    56-23-5 Carbon Tetrachloride 793 0.0780 8.80E-6 1.25 174 0.0019
    57-74-9 Chlordane 0.056 0.0118 4.37E-6 0.00199 120,000 0.00025
    106-47-8 p-Chloroaniline 5,300 0.0483 1.01E-5 0.0000136 66.1 No Data
    108-09-7 Chlorobenzene 472 0.0730 8.70E-6 0.152 219 0.0023
    124-48-1 Chlorodibromomethane 2,600 0.0196 1.05E-5 0.0321 63.1 0.00385
    67-66-3 Chloroform 7,920 0.104 1.00E-5 0.15 39.8 0.00039
    95-57-8 2-Chlorophenol 22,000 0.0501 9.46E-6 0.016 388 No Data
    218-01-9 Chrysene 0.0016 0.0248 6.21E-6 0.00388 398,000 0.00035
    94-75-7 2,4-D 680 0.0231 7.31E-6 0.00000041 451 0.00385
    72-54-8 4,4'-DDD 0.09 0.0169 4.76E-6 0.000164 1,000,000 0.000062

     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    72-55-9 4,4'-DDE 0.12 0.0144 5.87E-6 0.000861 4,470,000 0.000062
    50-29-3 4,4'-DDT 0.025 0.0137 4.95E-6 0.000332 2,630,000 0.000062
    75-99-0 Dalapon 900,000 0.0414 9.46E-6 0.00000264 5.8 0.005775
    53-70-3 Dibenzo(a,h)anthracene 0.00249 0.0202 5.18E-6 0.000000603 3,800,000 0.00037
    96-12-8 1,2-Dibromo-3-chloropropane 1,200 0.0212 7.02E-6 0.00615 182 0.001925
    106-93-4 1,2-Dibromoethane 4,200 0.0287 8.06E-6 0.0303 93 0.005775
    84-74-2 Di-n-butyl Phthalate 11.2 0.0438 7.86E-6 0.0000000385 33,900 0.03013
    95-50-1 1,2-Dichlorobenzene 156 0.0690 7.90E-6 0.0779 617 0.0019
    106-46-7 1,4-Dichlorobenzene 73.8 0.0690 7.90E-6 0.0996 617 0.0019
    91-94-1 3,3-Dichlorobenzidine 3.11 0.0194 6.74E-6 0.000000164 724 0.0019

     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    75-34-3 1,1-Dichloroethane 5,060 0.0742 1.05E-5 0.23 31.6 0.0019
    107-06-2 1,2-Dichloroethane 8,520 0.104 9.90E-6 0.0401 17.4 0.0019
    75-35-4 1,1-Dichloroethylene 2,250 0.0900 1.04E-5 1.07 58.9 0.0053
    156-59-2 cis-1,2-Dichloroethylene 3,500 0.0736 1.13E-5 0.167 35.5 0.00024
    156-60-5 trans-1,2-Dichloroethylene 6,300 0.0707 1.19E-5 0.385 52.5 0.00024
    120-83-2 2,4-Dichlorophenol 4,500 0.0346 8.77E-6 0.00013 147 0.00027
    78-87-5 1,2-Dichloropropane 2,800 0.0782 8.73E-6 0.115 43.7 0.00027
    542-75-6 1,3-Dichloropropylene
    (cis + trans)     		2,800 0.0626 1.00E-5 0.726 45.7 0.061
    60-57-1 Dieldrin 0.195 0.0125 4.74E-6 0.000619 21,400 0.00032
    84-66-2 Diethyl Phthalate 1,080 0.0256 6.35E-6 0.0000185 288 0.00619
    105-67-9 2,4-Dimethylphenol 7,870 0.0584 8.69E-6 0.000082 209 0.0495
    51-28-5 2,4-Dinitrophenol 2,790 0.0273 9.06E-6 0.0000182 0.01 0.00132

     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    121-14-2 2,4-Dinitrotoluene 270 0.203 7.06E-6 0.0000038 95.5 0.00192
    606-20-2 2,6-Dinitrotoluene 182 0.0327 7.26E-6 0.0000306 69.2 0.00192
    88-85-7 Dinoseb 52 0.0215 6.62E-6 0.0000189 1,120 0.002817
    117-84-0 Di-n-octyl Phthalate 0.02 0.0151 3.58E-6 0.00274 83,200,000 0.0019
    115-29-7 Endosulfan 0.51 0.0115 4.55E-6 0.000459 2,140 0.07629
    145-73-3 Endothall 21,000 0.0291 8.07E-6 0.0000000107 0.29 No Data
    72-20-8 Endrin 0.25 0.0125 4.74E-6 0.000308 12,300 0.00032
    100-41-4 Ethylbenzene 169 0.0750 7.80E-6 0.323 363 0.003
    206-44-0 Fluoranthene 0.206 0.0302 6.35E-6 0.00066 107,000 0.00019
    86-73-7 Fluorene 1.98 0.0363 7.88E-6 0.00261 13,800 0.000691
    76-44-8 Heptachlor 0.18 0.0112 5.69E-6 60.7 1,410,000 0.13
    1024-57-3 Heptachlor epoxide 0.2 0.0132 4.23E-6 0.00039 83,200 0.00063

     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    118-74-1 Hexachlorobenzene 6.2 0.0542 5.91E-6 0.0541 55,000 0.00017
    319-84-6 alpha-HCH (alpha-BHC) 2.0 0.0142 7.34E-6 0.000435 1,230 0.0025
    58-89-9 gamma-HCH (Lindane) 6.8 0.0142 7.34E-6 0.000574 1,070 0.0029
    77-47-4 Hexachlorocyclo-
    pentadiene     		1.8 0.0161 7.21E-6 1.11 200,000 0.012
    67-72-1 Hexachloroethane 50 0.0025 6.80E-6 0.159 1,780 0.00192
    193-39-5 Indeno(1,2,3-c,d)pyrene 0.000022 0.0190 5.66E-6 0.0000656 3,470,000 0.00047
    78-59-1 Isophorone 12,000 0.0623 6.76E-6 0.000272 46.8 0.01238
    7439-97-6 Mercury --- 0.0307 6.30E-6 0.467 --- No Data
    72-43-5 Methoxychlor 0.045 0.0156 4.46E-6 0.000648 97,700 0.0019
    74-83-9 Methyl Bromide 15,200 0.0728 1.21E-5 0.256 10.5 0.01824
    75-09-2 Methylene Chloride 13,000 0.101 1.17E-5 0.0898 11.7 0.012
    95-48-7 2-Methylphenol 26,000 0.0740 8.30E-6 0.0000492 91.2 0.0495

     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    91-20-3 Naphthalene 31.0 0.0590 7.50E-6 0.0198 2,000 0.0027
    98-95-3 Nitrobenzene 2,090 0.0760 8.60E-6 0.000984 64.6 0.00176
    86-30-6 N-Nitrosodiphenylamine 35.1 0.0312 6.35E-6 0.000205 1,290 0.01
    621-64-7 N-Nitrosodi-n-propylamine 9,890 0.0545 8.17E-6 0.0000923 24.0 0.0019
    87-86-5 Pentachlorophenol 1,950 0.0560 6.10E-6 0.000001 592 0.00045
    108-95-2 Phenol 82,800 0.0820 9.10E-6 0.0000163 28.8 0.099
    1918-02-1 Picloram 430 0.0255 5.28E-6 0.00000000166 1.98 No Data
    1336-36-3 Polychlorinated biphenyls (PCBs) 0.7 -------a -------a -------a 309,000 No Data
    129-00-0 Pyrene 0.135 0.0272 7.24E-6 0.000451 105,000 0.00018
    122-34-9 Simazine 5 0.027 7.36E-6 0.0000000133 133 No Data
    100-42-5 Styrene 310 0.0710 8.00E-6 0.113 776 0.0033
    93-72-1 2,4,5-TP (Silvex) 31 0.0194 5.83E-6 0.0000000032 5,440 No Data

     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    127-18-4 Tetrachloroethylene 200 0.0720 8.20E-6 0.754 155 0.00096
    108-88-3 Toluene 526 0.0870 8.60E-6 0.272 182 0.011
    8001-35-2 Toxaphene 0.74 0.0116 4.34E-6 0.000246 257,000 No Data
    120-82-1 1,2,4-Trichlorobenzene 300 0.0300 8.23E-6 0.0582 1,780 0.0019
    71-55-6 1,1,1-Trichloroethane 1,330 0.0780 8.80E-6 0.705 110 0.0013
    79-00-5 1,1,2-Trichloroethane 4,420 0.0780 8.80E-6 0.0374 50.1 0.00095
    79-01-6 Trichloroethylene 1,100 0.0790 9.10E-6 0.422 166 0.00042
    95-95-4 2,4,5-Trichlorophenol 1,200 0.0291 7.03E-6 0.000178 1,600 0.00038
    88-06-2 2,4,6-Trichlorophenol 800 0.0318 6.25E-6 0.000319 381 0.00038
    108-05-4 Vinyl Acetate 20,000 0.0850 9.20E-6 0.021 5.25 No Data
    57-01-4 Vinyl Chloride 2,760 0.106 1.23E-6 1.11 18.6 0.00024
    108-38-3 m-Xylene 161 0.070 7.80E-6 0.301 407 0.0019

     
     
     
    CAS No.     		 
     
     
    Chemical     		 
    Solubility in Water (S)
    (mg/L)     		 
    Diffusivity in Air (Di)
    (cm2/s)     		 
    Diffusivity in Water (Dw)
    (cm2/s)     		Dimensionless
    Henry's Law Constant (H')
    (25oC)     		Organic Carbon Partition Coefficient (Koc)
    (L/kg)     		First
    Order
    Degradation Constant
    ( l )
    (d-1)
    95-47-6 o-Xylene 178 0.087 1.00E-5 0.213 363 0.0019
    106-42-3 p-Xylene 185 0.0769 8.44E-6 0.314 389 0.0019
    1330-20-7 Xylenes (total) 186 0.0720 9.34E-6 0.25 260 0.0019

    Chemical Abstracts Service (CAS) registry number. This number in the format xxx-xx-x, is unique for each chemical and allows efficient searching on computerized data bases.
     
    aSoil remediation objectives are determined pursuant to 40 CFR 761.120, as incorporated by reference at Section 732.104 (the USEPA "PCB Spill Cleanup Policy"), for most sites; persons remediating sites should consult with BOL if calculation of Tier 2 soil remediation objectives is desired.
     
     

     



    Section 742.APPENDIX C:  Tier 2 Tables and Illustrations
     



    Section 742.Table F:    Methods for Determining Physical Soil Parameters
     
     

    Methods for Determining Physical Soil Parameters
     
         		  
    Parameter Sampling Locationa Method
     
     
    r b (soil bulk density)     		 
     
    Surface     		ASTM - D 1556-90
    Sand Cone Methodb
        ASTM - D 2167-94
    Rubber Balloon Methodb
        ASTM - D 2922-91
    Nuclear Methodb
      Subsurface ASTM - D 2937-94
    Drive Cylinder Methodb
    r s (soil particle density) Surface or Subsurface ASTM - D 854-92
    Specific Gravity of Soilb
     
    w (moisture content)     		 
    Surface or Subsurface     		ASTM - D 4959-89
    (Reapproved 1994)
    Standardb
        ASTM - D 4643-93
    Microwave Ovenb
        ASTM - D2216-92
    Laboratory Determinationb
        ASTM - D3017-88
    (Reapproved 1993)
    Nuclear Methodb
        Equivalent USEPA Method (e.g., sample preparation procedures described in methods 3541 or 3550)
     
    foc (organic carbon content)     		 
    Surface or Subsurface     		Nelson and Sommers (1982)
        ASTM - D 2974-87
    (Reapproved 1995)
    Moisture, Ash, and Organic Matterb
        USEPA Method 9060A
    Total Organic Content

     

    Methods for Determining Physical Soil Parameters
     
    		   
    Parameter Sampling Locationa Method
    h or q T (total soil porosity) Surface or Subsurface (calculated) Equation S24 in Appendix C, Table A for SSL Model, or Equation R23 in Appendix C, Table C for RBCA Model
    q a or q as (air-filled soil porosity) Surface or Subsurface (calculated) Equation S21 in Appendix C, Table A for SSL Model, or Equation R21 in Appendix C, Table C for RBCA Model
    q w or q ws (water-filled soil porosity) Surface or Subsurface (calculated) Equation S20 in Appendix C, Table A for SSL Model, or Equation R22 in Appendix C, Table C for RBCA Model
     
           		  
           		 ASTM - D 5084-90
    Flexible Wall Permeameter
    K (hydraulic conductivity) Surface or Subsurface Pump Test
        Slug Test
    i (hydraulic gradient) Surface or Subsurface Field Measurement

    a This is the location where the sample is collected
    b As incorporated by reference in Section 742.120.
     
     


    Section 742.APPENDIX C:
    Tier 2 Tables and Illustrations
     


    Section 742.Table G: Error Function (erf)
      
    b  
     
    erf ( b )
    0 0
    0.05 0.056372
    0.1 0.112463
    0.15 0.167996
    0.2 0.222703
    0.25 0.276326
    0.3 0.328627
    0.35 0.379382
    0.4 0.428392
    0.45 0.475482
    0.5 0.520500
    0.55 0.563323
    0.6 0.603856
    0.65 0.642029
    0.7 0.677801
    0.75 0.711156
    0.8 0.742101
    0.85 0.770668
    0.9 0.796908
    0.95 0.820891
    1.0 0.842701
    1.1 0.880205
    1.2 0.910314
    1.3 0.934008
    1.4 0.952285
    1.5 0.966105
    1.6 0.976348
    1.7 0.983790
    1.8 0.989091
    1.9 0.992790
    2.0 0.995322
    2.1 0.997021
    2.2 0.998137
    2.3 0.998857
    2.4 0.999311
    2.5 0.999593
    2.6 0.999764
    2.7 0.999866
    2.8 0.999925
    2.9 0.999959
    3.0 0.999978



    742.APPENDIX C: Tier 2 Tables and Illustrations
     


    Section 742.Table H:
    Q/C Values by Source Area

     
     
     
    Source
    (Acres)
    Area Q/C Value
    (g/m2-s per kg/m3)
    0.5
    97.78
    1
    85.81
    2
    76.08
    5
    65.75
    10
    59.16
    30
    50.60


    Section 742.APPENDIX C:
    Tier 2 Tables and Illustrations

     

    Section 742.TABLE I:
    Koc Values for Ionizing Organics as a Function of pH (cm3/g or L/kg)

     
     
     
    pH     		 
     
    Benzoic Acid     		 
    2-Chloro- phenol     		2,4-
    Dichloro-phenol     		 
    Pentachloro-phenol     		2,4,5-Trichloro-phenol 2,4,6-Trichloro-phenol  
     
    Dinoseb     		 
    2,3,5-TP
    (Silvex)
    4.5 1.07E+01 3.98E+02 1.59E+02 1.34E+04 2.37E+03 1.06E+03 3.00E+03 1.28E+04
    4.6 9.16E+00 3.98E+02 1.59E+02 1.24E+04 2.37E+03 1.05E+03 2.71E+03 1.13E+04
    4.7 7.79E+00 3.98E+02 1.59E+02 1.13E+04 2.37E+03 1.05E+03 2.41E+03 1.01E+04
    4.8 6.58E+00 3.98E+02 1.59E+02 1.02E+04 2.37E+03 1.05E+03 2.12E+03 9.16E+03
    4.9 5.54E+00 3.98E+02 1.59E+02 9.05E+03 2.37E+03 1.04E+03 1.85E+04 8.40E+03
    5.0 4.64E+00 3.98E+02 1.59E+02 7.96E+03 2.36E+03 1.03E+03 1.59E+04 7.76E+03
    5.1 3.88E+00 3.98E+02 1.59E+02 6.93E+03 2.36E+03 1.02E+03 1.36E+04 7.30E+03
    5.2 3.25E+00 3.98E+02 1.59E+02 5.97E+03 2.35E+03 1.01E+03 1.15E+04 6.91E+03
    5.3 2.72E+00 3.98E+02 1.59E+02 5.10E+03 2.34E+03 9.99E+02 9.66E+03 6.60E+03
    5.4 2.29E+00 3.98E+02 1.58E+02 4.32E+03 2.33E+03 9.82E+02 8.10E+03 6.36E+03
    5.5 1.94E+00 3.97E+02 1.58E+02 3.65E+03 2.32E+03 9.62E+02 6.77E+03 6.16E+03
    5.6 1.65E+00 3.97E+02 1.58E+02 3.07E+03 2.31E+03 9.38E+02 5.65E+03 6.00E+03
    5.7 1.42E+00 3.97E+02 1.58E+02 2.58E+03 2.29E+03 9.10E+02 4.73E+03 5.88E+03
    5.8 1.24E+00 3.97E+02 1.58E+02 2.18E+03 2.27E+03 8.77E+02 3.97E+03 5.78E+03
    5.9 1.09E+00 3.97E+02 1.57E+02 1.84E+03 2.24E+03 8.39E+02 3.35E+03 5.70E+03

     
     
    pH     		 
     
    Benzoic Acid     		 
    2-Chloro- phenol     		2,4-
    Dichloro-phenol     		 
    Pentachloro-phenol     		2,4,5-Trichloro-phenol 2,4,6-Trichloro-phenol  
     
    Dinoseb     		 
    2,3,5-TP
    (Silvex)
    6.0 9.69E-01 3.96E+02 1.57E+02 1.56E+03 2.21E+03 7.96E+02 2.84E+03 5.64E+03
    6.1 8.75E-01 3.96E+02 1.57E+02 1.33E+03 2.17E+03 7.48E+02 2.43E+03 5.59E+03
    6.2 7.99E-01 3.96E+02 1.56E+02 1.15E+03 2.12E+03 6.97E+02 2.10E+03 5.55E+03
    6.3 7.36E-01 3.95E+02 1.55E+02 9.98E+02 2.06E+03 6.44E+02 1.83E+03 5.52E+03
    6.4 6.89E-01 3.94E+02 1.54E+02 8.77E+02 1.99E+03 5.89E+02 1.62E+03 5.50E+03
    6.5 6.51E-01 3.93E+02 1.53E+02 7.81E+02 1.91E+03 5.33E+02 1.45E+03 5.48E+03
    6.6 6.20E-01 3.92E+02 1.52E+02 7.03E+02 1.82E+03 4.80E+02 1.32E+03 5.46E+03
    6.7 5.95E-01 3.90E+02 1.50E+02 6.40E+02 1.71E+03 4.29E+02 1.21E+03 5.45E+03
    6.8 5.76E-01 3.88E+02 1.47E+02 5.92E+02 1.60E+03 3.81E+02 1.12E+03 5.44E+03
    6.9 5.60E-01 3.86E+02 1.45E+02 5.52E+02 1.47E+03 3.38E+02 1.05E+03 5.43E+03
    7.0 5.47E-01 3.83E+02 1.41E+02 5.21E+02 1.34E+03 3.00E+02 9.96E+02 5.43E+03
    7.1 5.38E-01 3.79E+02 1.38E+02 4.96E+02 1.21E+03 2.67E+02 9.52E+02 5.42E+03
    7.2 5.32E-01 3.75E+02 1.33E+02 4.76E+02 1.07E+03 2.39E+02 9.18E+02 5.42E+03
    7.3 5.25E-01 3.69E+02 1.28E+02 4.61E+02 9.43E+02 2.15E+02 8.90E+02 5.42E+03
    7.4 5.19E-01 3.62E+02 1.21E+02 4.47E+02 8.19E+02 1.95E+02 8.68E+02 5.41E+03
    7.5 5.16E-01 3.54E+02 1.14E+02 4.37E+02 7.03E+02 1.78E+02 8.50E+02 5.41E+03
    7.6 5.13E-01 3.44E+02 1.07E+02 4.29E+02 5.99E+02 1.64E+02 8.36E+02 5.41E+03

     
     
    pH     		 
     
    Benzoic Acid     		 
    2-Chloro- phenol     		2,4-
    Dichloro-phenol     		 
    Pentachloro-phenol     		2,4,5-Trichloro-phenol 2,4,6-Trichloro-phenol  
     
    Dinoseb     		 
    2,3,5-TP
    (Silvex)
    7.7 5.09E-01 3.33E+02 9.84E+01 4.23E+02 5.07E+02 1.53E+02 8.25E+02 5.41E+03
    7.8 5.06E-01 3.19E+02 8.97E+01 4.18E+02 4.26E+02 1.44E+02 8.17E+02 5.41E+03
    7.9 5.06E-01 3.04E+02 8.07E+01 4.14E+02 3.57E+02 1.37E+02 8.10E+02 5.41E+03
    8.0 5.06E-01 2.86E+02 7.17E+01 4.10E+02 2.98E+02 1.31E+02 8.04E+02 5.41E+03


    Section 742.APPENDIX C:
    Tier 2 Tables and Illustrations

     
    Section 742.TABLE J:  Values to be Substituted for ks when Evaluating Inorganics as a Function of pH (cm3water/gsoil)
     
    pH As Ba Be Cd Cr (+3) Cr (+6) Hg Ni Ag Se Tl Zn
    4.9 2.5E+01 1.1E+01 2.3E+01 1.5E+01 1.2E+03 3.1E+01 4.0E-02 1.6E+01 1.0E-01 1.8E+01 4.4E+01 1.6E+01
    5.0 2.5E+01 1.2E+01 2.6E+01 1.7E+01 1.9E+03 3.1E+01 6.0E-02 1.8E+01 1.3E-01 1.7E+01 4.5E+01 1.8E+01
    5.1 2.5E+01 1.4E+01 2.8E+01 1.9E+01 3.0E+03 3.0E+01 9.0E-02 2.0E+01 1.6E-01 1.6E+01 4.6E+01 1.9E+01
    5.2 2.6E+01 1.5E+01 3.1E+01 2.1E+01 4.9E+03 2.9E+01 1.4E-01 2.2E+01 2.1E-01 1.5E+01 4.7E+01 2.1E+01
    5.3 2.6E+01 1.7E+01 3.5E+01 2.3E+01 8.1E+03 2.8E+01 2.0E-01 2.4E+01 2.6E-01 1.4E+01 4.8E+01 2.3E+01
    5.4 2.6E+01 1.9E+01 3.8E+01 2.5E+01 1.3E+04 2.7E+01 3.0E-01 2.6E+01 3.3E-01 1.3E+01 5.0E+01 2.5E+01
    5.5 2.6E+01 2.1E+01 4.2E+01 2.7E+01 2.1E+04 2.7E+01 4.6E-01 2.8E+01 4.2E-01 1.2E+01 5.1E+01 2.6E+01
    5.6 2.6E+01 2.2E+01 4.7E+01 2.9E+01 3.5E+04 2.6E+01 6.9E-01 3.0E+01 5.3E-01 1.1E+01 5.2E+01 2.8E+01
    5.7 2.7E+01 2.4E+01 5.3E+01 3.1E+01 5.5E+04 2.5E+01 1.0E-00 3.2E+01 6.7E-01 1.1E+01 5.4E+01 3.0E+01
    5.8 2.7E+01 2.6E+01 6.0E+01 3.3E+01 8.7E+04 2.5E+01 1.6E-00 3.4E+01 8.4E-01 9.8E+00 5.5E+01 3.2E+01
    5.9 2.7E+01 2.8E+01 6.9E+01 3.5E+01 1.3E+05 2.4E+01 2.3E-00 3.6E+01 1.1E+00 9.2E+00 5.6E+01 3.4E+01
    6.0 2.7E+01 3.0E+01 8.2E+01 3.7E+01 2.0E+05 2.3E+01 3.5E-00 3.8E+01 1.3E+00 8.6E+00 5.8E+01 3.6E+01
    6.1 2.7E+01 3.1E+01 9.9E+01 4.0E+01 3.0E+05 2.3E+01 5.1E-00 4.0E+01 1.7E+00 8.0E+00 5.9E+01 3.9E+01
    6.2 2.8E+01 3.3E+01 1.2E+02 4.2E+01 4.2E+05 2.2E+01 7.5E-00 4.2E+01 2.1E+00 7.5E+00 6.1E+01 4.2E+01
    6.3 2.8E+01 3.5E+01 1.6E+02 4.4E+01 5.8E+05 2.2E+01 1.1E+01 4.5E+01 2.7E+00 7.0E+00 6.2E+01 4.4E+01
    6.4 2.8E+01 3.6E+01 2.1E+02 4.8E+01 7.7E+05 2.1E+01 1.6E+01 4.7E+01 3.4E+00 6.5E+00 6.4E+01 4.7E+01
    6.5 2.8E+01 3.7E+01 2.8E+02 5.2E+01 9.9E+05 2.0E+01 2.2E+01 5.0E+01 4.2E+00 6.1E+00 6.6E+01 5.1E+01
    6.6 2.8E+01 3.9E+01 3.9E+02 5.7E+01 1.2E+06 2.0E+01 3.0E+01 5.4E+01 5.3E+00 5.7E+00 6.7E+01 5.4E+01

    pH As Ba Be Cd Cr (+3) Cr (+6) Hg Ni Ag Se Tl Zn
    6.7 2.9E+01 4.0E+01 5.5E+02 6.4E+01 1.5E+06 1.9E+01 4.0E+01 5.8E+01 6.6E+00 5.3E+00 6.9E+01 5.8E+01
    6.8 2.9E+01 4.1E+01 7.9E+02 7.5E+01 1.8E+06 1.9E+01 5.2E+01 6.5E+01 8.3E+00 5.0E+00 7.1E+01 6.2E+01
    6.9 2.9E+01 4.2E+01 1.1E+03 9.1E+01 2.1E+06 1.8E+01 6.6E+01 7.4E+01 1.0E+01 4.7E+00 7.3E+01 6.8E+01
    7.0 2.9E+01 4.2E+01 1.7E+03 1.1E+02 2.5E+06 1.8E+01 8.2E+01 8.8E+01 1.3E+01 4.3E+00 7.4E+01 7.5E+01
    7.1 2.9E+01 4.3E+01 2.5E+03 1.5E+02 2.8E+06 1.7E+01 9.9E+01 1.1E+02 1.6E+01 4.1E+00 7.6E+01 8.3E+01
    7.2 3.0E+01 4.4E+01 3.8E+03 2.0E+02 3.1E+06 1.7E+01 1.2E+02 1.4E+02 2.0E+01 3.8E+00 7.8E+01 9.5E+01
    7.3 3.0E+01 4.4E+01 5.7E+03 2.8E+02 3.4E+06 1.6E+01 1.3E+02 1.8E+02 2.5E+01 3.5E+00 8.0E+01 1.1E+02
    7.4 3.0E+01 4.5E+01 8.6E+03 4.0E+02 3.7E+06 1.6E+01 1.5E+02 2.5E+02 3.1E+01 3.3E+00 8.2E+01 1.3E+02
    7.5 3.0E+01 4.6E+01 1.3E+04 5.9E+02 3.9E+06 1.6E+01 1.6E+02 3.5E+02 3.9E+01 3.1E+00 8.5E+01 1.6E+02
    7.6 3.1E+01 4.6E+01 2.0E+04 8.7E+02 4.1E+06 1.5E+01 1.7E+02 4.9E+02 4.8E+01 2.9E+00 8.7E+01 1.9E+02
    7.7 3.1E+01 4.7E+01 3.0E+04 1.3E+03 4.2E+06 1.5E+01 1.8E+02 7.0E+02 5.9E+01 2.7E+00 8.9E+01 2.4E+02
    7.8 3.1E+01 4.9E+01 4.6E+04 1.9E+03 4.3E+06 1.4E+01 1.9E+02 9.9E+02 7.3E+01 2.5E+00 9.1E+01 3.1E+02
    7.9 3.1E+01 5.0E+01 6.9E+04 2.9E+03 4.3E+06 1.4E+01 1.9E+02 1.4E+03 8.9E+01 2.4E+00 9.4E+01 4.0E+02
    8.0 3.1E+01 5.2E+01 1.0E+05 4.3E+03 4.3E+06 1.4E+01 2.0E+02 1.9E+03 1.1E+02 2.2E+00 9.6E+01 5.3E+02


    Section 742.APPENDIX C:
    Tier 2 Tables and Illustrations

     

    Section 742.TABLE K: Parameter Estimates for Calculating Water-Filled Soil Porosity (q w)

     
    Soil Texturea
    Saturated Hydraulic
    Conductivity, Ks
    (m/yr)
    1/(2b+3)b
    Sand 1,830 0.090
    Loamy Sand 540 0.085
    Sandy Loam 230 0.080
    Silt Loam 120 0.074
    Loam 60 0.073
    Sandy Clay Loam 40 0.058
    Silt Clay Loam 13 0.054
    Clay Loam 20 0.050
    Sandy Clay 10 0.042
    Silt Clay 8 0.042
    Clay 5 0.039
    a The appropriate texture classification is determined by a particle size analysis by ASTM D2488-93 as incorporated by reference in Section 742.210 and the U.S. Department of Agriculture Soil Textural Triangle shown in Appendix C, Illustration C.

     
    b   Where b is the soil-specific exponential parameter (unitless )
     

     
     
     IT IS SO ORDERED.
     

    Section 41 of the Environmental Protection Act (415 ILCS 5/41(1994)) provides for the appeal of final Board opinions and orders to the Illinois Appellate Court within 35 days of the date of service of this order. The Rules of the Supreme Court of Illinois establish filing requirement. (See also 35 Ill.Adm. Code 101.246 “Motions for Reconsideration.”)

     
     I, Dorothy M. Gunn, Clerk of the Illinois Pollution Control Board, hereby certify that the above opinion and order was adopted on the 5th day of June, 1997, by a vote of 7-0.
     


    Dorothy M. Gunn, Clerk
    Illinois Pollution Control Board
     
     
     
     
     

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    ________________________
    The Board gratefully acknowledges the efforts of the entire staff throughout this rulemaking, and in particular the concerted efforts of Kevin Desharnais as the hearing officer and attorney-assistant; Charles Feinen and Amy Muran-Felton, attorney-assistants; Anand Rao and Elizabeth Ann of the Technical Unit, and Kemelyau Pittman. Their help greatly assisted the Board in deciding and managing the complexities this rulemaking entailed.