ILLINOIS POLLUTION CONTROL BOARD

June 2, 1994

IN THE

MATTER

OF:

)

GROUNDWATER PROTECTION:

 AMENDMENTS

)

 R93-27

TO GROUNDWATER QUALITY STANDARDS

)

 (Rulemaking)

(35 ILL.

ADM.

 CODE 620)

)

Proposed Rule.

 Second Notice.

OPINION

AND

ORDER OF THE BOARD

 (by R. C. Flemal):

On March 17,

 1994 the Board adopted for first notice certain

amendments to the Board’s groundwater quality standards found at

35 Iii. Adm. Code 620.

 The impetus for the amendments was a

proposal filed by the Illinois Environmental Protection Agency

(Agency) under the general rulemaking provisions of Sections 27

and 28 of the Environmental Protection Act

 (Act)

 (415 ILCS 5/27—

28)

The Board is charged under the Act to “determine, define and

implement the environmental control standards applicable in the

State of Illinois”

 (415 ILCS 5/5(b)).

 More generally, the

Board’s rulemaking charge is based on the system of checks and

balances integral to Illinois environmental governance: the Board

bears responsibility for the rulemaking and principal

adjudicatory functions, whereas the Agency is responsible for

carrying out the principal administrative duties,

 including

 proposal and administration of regulations.

The principal provisions of the proposed amendments consists

of

(1)

 adding Class I and Class II groundwater quality standards

for sixteen chemicals for which standards have not previously

been promulgated,

 (2) amending certain provisions of the

preventive notification and response provisions,

 including

listing of nine of the new sixteen chemicals there,

and

(3)

making various amendments of a conforming nature.

 The interested

person is directed to the Board’s March 17,

 1994 first notice

opinion for a full discussion of the proposed amendments.

Today’s opinion will address only the modifications today

proposed to the amendments as first noticed.

By today’s action the Board adopts the first notice proposal

for second notice, with modifications based upon public comments.

PROCEDURAL

HISTORY

The Agency filed its proposal on October

18,

 1993 and an

addendum to the proposal on January 19,

 1994.

 Hearings were held

—2—

on February 10,

 1994 in Chicago and on February 8,

 1994 and

February 23, 1994 in Springfield before hearing officer Michelle

C. Dresdow.

 Testimony in support of the amendments was presented

by Richard P. Cobb, Manager of the Agency’s Groundwater Section

of the Division of Public Water Supplies in the Bureau of Water

 and Dr. Thomas Hornshaw of the Agency’s Office of Chemical

Safety.

First notice publication occurred at 18 Ill. Reg.

 5113,

April

1,

 1994.

 The first notice comment period expired on May

16,

 1994.

Five public comments

 (PC) have been received during the

first notice comment period.

 In PC #1 Business and Professional

People for the Public Interest, The McHenry County Defenders,

Citizens for a Better Environment, and The Illinois Chapter of

the Sierra Club,

 express support for the amendment proposed at

620.302(b) (4).

Public comments #2 and #3, filed by the Administrative Code

Division of the Office of the Secretary of State

 (Code Division)

and by the Agency, respectively, recommend various amendments to

the first notice proposal.

 Public comments #4 and #5,

 filed by

by Ciba Plant Protection and Waste Management, Inc.

 (WMI),

recommend actions in regard to simazine and ethylene dibromide,

respectively.

 Disposition of these various recommendations is

discussed below.

DISPOSITION OF MODIFICATIONS RECOMMENDED FOR SECOND NOTICE

The filers of public comments #2 through #5 recommend that

the first notice proposal be modified.

 The disposition of these

recommendations is discussed here.

 The Board notes that,

for

ease of identification, changes made as a result of these

recommendations are presented in the attached second notice order

 in redlining.

Code Division in PC #2 observes that pursuant to

codification requirements it is necessary to conform the title of

Section 620.420 in the table of contents with the title in the

text, add the Subpart F heading before Section 620.605, and

present the missing subsection

 (b)(2) within 620.605(b).

 Each of

these modifications in made today.

 It is to be noted that none

of these changes constitutes a amendment of the existing text of

the groundwater regulations, but rather that each is a correction

of a error present only in the first notice text.

The Agency in PC #3 recommends six additional amendments to

Part 620.

 The affected sections, and the action the Board today

proposes, are summarized in the table below.

—3—

Section

 A~encvRecommendation and Board Action

620.125

 Modify citation to “Test Methods for

Evaluating Solid Wastes, Physical/Chemical

Methods” to indicate most recent update

 (July

1992)

 ACCEPTED

620.310(a) (3)

 Add simazine to list of preventive

notification parameters

 ACCEPTED

620.410(b)

 Delete “denotes a carcinogen” symbol from

simazine

 ACCEPTED

620.420(b)

 Delete “denotes a carcinogen” symbol from

simazine

 ACCEPTED

620.510(b)

 Add citation to incorporated references

——

ACCEPTED

620.605(b)(1)

 Add citation to incorporated reference

NOT

NECESSARY; PROPOSED IN FIRST NOTICE

The three changes involving simazine all reflect revised

information regarding the carcinogenicity of that chemical.

A

“carcinogen” is defined at 35 Ill.

 Adm. Code 620.10

 (emphasis

added):

“Carcinogen” means a chemical,

 or complex mixture of

closely related chemicals, which has been listed or

classified in the Integrated Risk Information System or

as specified in a final rule adopted by USEPA in

accordance with USEPA Guidelines for Carcinogenic Risk

Assessment, incorporated by reference at Section

620.125, to be a group A,

 B1, or B~çarcinogen.

Contrary to understanding at the time of first notice,

simazine is neither a group A nor group B carcinogen, and hence

it should not be designated as a carcinogen at either 620.410(b)

or 620.420(b).

 (PC #3 and #4.)

 Conversely,

 since simazine is

not a carcinogen,~it is appropriate to include it as a

constituent in the preventive notification and preventive

response requirements of 620.310, consistent with the other

parameters listed there.

Section 620.510,

 in which the Agency recommends adding

citation to incorporations by reference, had not been proposed

for amendment at first notice.

 Although the Board normally would

not propose to amend at second notice a section that it had not

proposed to amend at first notice, we find reasons to make

exception here.

 The citations at issue are generally available

and generally consulted by persons who must comply with this

section.

 The added citations,

 by providing additional acceptable

sources of sampling and analytical protocol, thereby assist

—4—

persons who are responsible for assessing compliance, and hence

assist with compliance itself.

 The type of change here is also

identical to the type of change proposed at first notice to

Section 620

•

605 (b) (1): that is, an updated incorporation by

reference.

WMI

contends that ethylene dibromide need not and should not

be added to the list of chemicals for which standards are today

proposed.

 (PC #5.)

WMI

contends that ethylene dibromide has not

been found in Illinois groundwater, and is not likely to occur

because its primary use is as a fumigant for orchard trees.

(a.)

In support of its position,

WHI

cites a March 1994 draft

report “Illinois Generic State Management Plan for Pesticides in

Groundwater”, prepared by the Pesticide Subcommittee of the

Interagency Coordinating Committee on Groundwater

 (hereinafter,

the March 1994 draft report)1.

 The March 1994 draft report

states that the Illinois Groundwater Protection Act mandates

various State agencies to engage in statewide groundwater quality

monitoring, including the Agency’s sampling of public water

supply wells.

The March 1994 draft report shows that an Illinois statewide

survey for agricultural chemicals in rural, private water supply

wells does not include ethylene dibromide as detected during that

survey.

 Contrary to WMI’s contention,

 the rulemaking record

indicates that ethylene dibromide has been recorded in Illinois

groundwater as reported by the Agency in survey results of public

water supply wells.

 (Exh.

 8 at p.

2.)

On this basis,

 the Board declines to delete ethylene

dibromide from today’s proposal.

ORDER

The Board hereby adopts for second notice the following

amendments to 35 Ill. Adm. Code 6202.

 The Clerk of the Board is

directed to submit this proposal with the Joint Committee on

Administrative Rules.

1

WMI

cites another report,

 “Initial Evaluation:

 Impacts of

Pesticides on Groundwater in Illinois.

 Report to the Illinois

Legislature, January 1990”.

 However, this report was not

included with the comments.

2

For the purposes of this second notice proposal only,

changes from the first notice proposal are indicated by

redlining.

—5—

TITLE

35:

 ENVIRONMENTAL PROTECTION

SUBTITLE

F: PUBLIC WATER SUPPLIES

CHAPTER

I: POLLUTION CONTROL BOARD

PART 620

GROUNDWATER QUALITY

SUBPART A: GENERAL

Section

620.105

 Purpose

620.110

 Definitions

620.115

 Prohibition

620.125

 Incorporations by Reference

620.130

 Exemption from General Use Standards and Public and

Food Processing Water Supply Standards

620.135

 Exclusion for Underground Water in Certain Man—Made

Conduits

SUBPART B: GROUNDWATER ClASSIFICATION

Section

620.201

 Groundwater Designations

620.210

 Class

 I: Potable Resource Groundwater

620.220

 Class II: General Resource Groundwater

620.230

 Class III: Special Resource Groundwater

620.240

 Class IV: Other Groundwater

620.250

 Groundwater Management Zone

620.260

 Reclassification of Groundwater by Adjusted Standard

SUBPART

 C: NONDEGRADATION PROVISIONS FOR

APPROPRIATE GROUNDWATERS

Section

620.301

 General Prohibition Against Use Impairment of Resource

Groundwater

620.302

 Applicability of Preventive Notification and Preventive

Response Activities

620.305

 Preventive Notification Procedures

 620.310

 Preventive Response Activities

SUBPART

GROUNDWATER

QUALITY

STANDARDS

Section

620.401

 Applicability

620.405

 General Prohibitions Against Violations of Groundwater

Quality Standards

620.410

 Groundwater Quality Standards for Class

 I: Potable

Resource Groundwater

620.420

 Groundwater Quality Standards for Class II: General

Resource Groundwater

620.430

 Groundwater Quality Standards for Class III: Special

Resource

Groundwater

—6—

620.440

 Groundwater Quality Standards for Class IV: Other

Groundwater

620.450

 Alternative Groundwater Quality Standards

SUBPART

GROUNDWATER

MONITORING

AND

ANALYTICAL

PROCEDURES

Section

620.505

 Compliance Determination

620.510

 Monitoring and Analytical Requirements

SUBPART F: HEALTH ADVISORIES

Section

620.601

 Purpose of a Health Advisory

620.605

 Issuance of a Health Advisory

620.610

 Publishing Health Advisories

620.615

 Additional Health Advice for Mixtures of Similar-Acting

Substances

620.Appendix

Procedures

for

 Determining

Human

Threshold

Toxicant Advisory Concentration for Class

I:

Potable Resource Groundwater

620.Appendix B Procedures for Determining Hazard Indices for

Class I: Potable Resource Groundwater for Mixtures

of Similar—Acting Substances

620.Appendix C Guidelines for Determining When Dose Addition of

Similar-Acting Substances in Class

I:

 Potable

Resource Groundwaters is Appropriate

620.Appendix D Confirmation of an Adequate Corrective Action

Pursuant to 35 Ill.

 Adin.

 Code 620.250

 (a) (2).

AUTHORITY:

 Implementing and authorized by Section

 8 of the

Illinois Groundwater Protection Act and Section 27 of the

Illinois Environmental Protection Act

 (Ill. Rev. Stat.

 1991,

ch.

111 1/2, par. 7458 and 1027).

 E415 ILCS 55/8 and 5/27

SOURCE:

 Adopted in R89-14(B) at 15 Ill. Reg.

 17614, effective

November 25,

 1991; amended in R89—14(C) at 16 Ill. Reg.

 14667,

effective September 11,

 1992;

 amended in R93-27 at 18 Ill. Reg.

effective

___________________

NOTE:

 Capitalization denotes statutory language.

SUBPART

 GENERAL

Section 620.125

 Incorporations by Reference

a)

 The Board incorporates the following material by

reference:

—7—

ASTN.

 American Society for Testing and Materials,

1976 Race Street, Philadelphia,

Pa.

19103

 (215)

299—5585

“Standard Practice for Description and

Identification of Soils

 (Visual Manual

Procedure)” D2488—84

GPO.

 Superintendent of Documents,

 U.S. Government

Printing Office, Washington,

 D.C. 20401,

 (202)

783—3238*:

Maximum Contaminant Level Goals and National

Primary Drinking Water Regulations for Lead

and Copper; Final Rule,

 56 Fed. Reg. 26460—

26564

 (June

7,

 1991).

National Primary Drinking Water Regulations,

Final Rule,

 56 Fed. Reg. 3526-3597

 (January

30,

1991).

National Primary Drinking Water Reciulations,

Final Rule.

 57 Fed. Req. 31776—31849

(July

17,

1992).

USEPA Guidelines for Carcinogenic Risk

Assessment,

 51 Fed. Reg. 33992—34003

(September 24,

 1986).

NCR?.

 National Council on Radiation Protection,

7910 Woodmont Ave., Bethesda, MD

 (301)

 657—6252

“Maximum Permissible Body Burdens and Maximum

Permissible Concentrations of Radionuclides

in Air and in Water for Occupational

Exposure”, NCR? Report Number 22, June 5,

1959.

NTIS.

 National Technical Information Service,

5285 Port Royal Road,

 Springfield, VA 22161

 (703)

487—4600.

“Methods for Chemical Analysis of Water and

Wastes,” EPA Publication No. EPA-60014-79-

020,

 (March 1983),

 Doc. No. PB 84—128677

“Methods for the Determination of Organic

Compounds in Drinking Water”,

 EPA,

 EMSL, EPA-

600/4—88/039

 (Dec.

 1988), Doc.

 No. PB 89—

220461

—8—

“Practical Guide for Ground—Water Sampling”,

EPA Publication No. EPA/600/2-85/104

(September 1985),

 Doc. No. PB 86—137304

“Test Methods for Evaluating Solid Wastes,

Physical/Chemical Methods”, EPA Publication

No. SW-846 (Third Edition,

 1986, as amended

by Revision I~

~fl~’

~

~

I~2(Dcocmbcr 1~87),Doc

~o.

PB 89—148076

USGS.

 United States Geological Survey, 1961 Stout

St., Denver, CO 80294

 (303)

 844—4169

“Techniques of Water Resources Investigations

of the United States Geological Survey,

Guidelines for Collection and Field Analysis

of Ground-Water Samples for Selected Unstable

Constituents”, Book I, Chapter D2

 (1981).

b)

 This Section incorporates no later editions or

amendments.

(Source:

 Amended at 18

 Ill. Reg.

____,

 effective

____________)

SUBPART

 GROUNDWATER CLASSIFICATION

Section 620.210

 Class

I:

 Potable Resource Groundwater

Except as provided in Sections 620.230, 620.240,

 or 620.250,

Potable Resource Groundwater

is:

a)

 Groundwater located 10 feet or more below the land

surface

and

within:

The

minimum

setback

 zone of a well which serves as

potable

water

 supply and to the bottom of such

well;

2)

 Unconsolidated sand, gravel or sand and gravel

which is 5 feet or more in thickness and that

contains 12 percent or less of fines

 (i.e.

 fines

which pass through a No. 200 sieve tested

according to ASTM Standard Practice D2488—84,

incorporated by reference at Section 620.125);

3)

 Sandstone which is 10 feet or more in thickness or

fractured carbonate which is 15 feet e~

 more in

thickness; or

4)

Any

geologic material which is capable of a:

—9—

A)

 Sustained groundwater yield,

 from up to a 12

inch borehole,

 of 150 gallons per day or more

from a thickness of 15 feet or less; or

B)

 Hydraulic conductivity of

 1 x 10~cm/sec or

greater using one of the following test

methods or its equivalent:

i)

 Permeameter;

ii)

 Slug test; or

iii)

 Pump test.

b)

Any

groundwater which is determined by the Board

pursuant to petition procedures set forth in Section

620.260, to be capable of potable use.

(Board Note:

Any

portion of the thickness associated

with

the

geologic

 materials as described in subsections

620.210(a)

(2),

(a)

 (3) or

(a)

(4)

should

designated

Class

Potable

Resource

Groundwater

if

located

feet or more below the land surface.)

(Source:

 Amended at 18

 Ill. Reg.

____,

 effective

____________

Section 620.260

 Reclassification of Groundwater by Adjusted

Standard

Any person may petition the Board to reclassify a groundwater in

accordance with the procedures for adjusted standards specified

in Section 28.1 of the Act and 35 Ill. Adm. Code 106, Subpart G.

In any proceeding to reclassify specific groundwater by adjusted

standard,

 in addition to the requirements of 35 Ill. Adm. Code

106, Subpart G, and Section 28.1(c)

 of the Act, the petition

shall,

minimum,

 contain information to allow the Board to

determine:

a)

 The specific groundwater for which reclassification is

requested,

 including but not limited to geographical

extent of any aquifers, depth of groundwater, and rate

and direction of groundwater flow and that the specific

groundwater exhibits the characteristics of the

requested class as set forth in Sections 620.210(b),

620.220(b),

 620.230, or 620.24O4~3-;

b)

 Whether the proposed change or use restriction is

necessary

 for economic or social development, by

providing

information

including,

 but not limited to,

the

impacts

 the standards on the regional economy,

social

benefits

 such as loss of jobs or closing of

—10—

facilities,

 and economic analysis contrasting the

health and environmental benefits with costs likely to

be incurred in meeting the standards would be

beneficial or necessary;

C)

 Existing and anticipated uses of the specific

groundwater;

d)

 Existing and anticipated quality of the specific

groundwater;

e)

 Existing and anticipated contamination,

 if any, of the

specific groundwater;

f)

 Technical feasibility and economic reasonableness of

eliminating or reducing contamination of the specific

groundwater or of maintaining existing water quality;

g)

 The anticipated time period over which contaminants

will continue to affect the specific groundwater;

h)

 Existing and anticipated impact on any potable water

supplies due to

contamination;

i)

Availability

and

cost

 of alternate water sources or of

treatment for those users adversely affected;

 Negative or positive effect on property values; and

k)

 For special resource groundwater, negative or positive

effect on:

1)

The

quality

of surface waters; and

Wetlands,

natural

areas,

 and the life contained

therein,

including

endangered

 threatened

species

plant,

fish

 or wildlife listed pursuant

to the Endangered Species Act,

 16 U.S.C.

 1531 et

seq., or the Illinois Endangered Species

Protection

Act

 (Ill.

 Rev. Stat. 19&~j,,ch.

8,

para.

 331 et seq.).

 ~4l5 ILCS 10/1 et seci.

(Source:

 Amended at 18 Ill.

 Reg.

____,

 effective

_____________)

SUBPART C: NONDEGRADATION PROVISIONS FOR

APPROPRIATE

GROUNDWATERS

Section 620.302

 Applicability of Preventive Notification and

Preventive Response Activities

—11—

a)

 Preventive notification and preventive response as

specified in Sections 620.305 through 620.310 applies

to:

1)

 Class I groundwater under Section 620.210(a) (1),

(a) (2), or

 (a) (3) which is monitored by the

persons

 listed in subsection

 (b); or

Class

III

 groundwater which is monitored by the

persons

listed

 in subsection

 (b).

For

purposes

 subsection

 (a), the persons that

conduct groundwater monitoring are:

1)

 An owner or operator of a regulated entity for

which

 groundwater quality monitoring must be

performed

pursuant

State

Federal

law

regulation

(e.g.

Sections

106

and

 107 of the

Comprehensive Environmental Response, Compensation

and Liability Act,

 (42 U.S.C.

 9601, et seq.);

 Sections 3004 and 3008 of the Resource

Conservation and Recovery Act,

 (42 U.S.C.

 6901,

et

seq.); Sections 4(q),

 4(v),

 12(g),

 21(d), 21(f),

22.2(f),

 22.2(m) and 22.18 of the Act;

 35 Ill.

Adm.

Code

724,

725,

730,

731,

750,

 811 and 814.)j*~

owner

operator

public

water

supply

well

who

conducts

groundwater

 quality monitoring; or

state

agency

which

authorized

 to conduct, or

is the recipient of, groundwater quality

monitoring data

 (e.g.,

 Illinois Environmental

Protection Agency, Department of Public Health,

Department of Conservation, Department of Mines

and Minerals, Department of Agriculture, Office of

State Fire Marshal’ or Department of Energy and

Natural Resources).

 An owner or operator of a facility that conducts

ciroundwater quality monitoring pursuant to State

or federal judicial or administrative order.

c)

 If a contaminant exceeds a standard set forth in

Section 620.410 or Section 620.430, the appropriate

remedy is corrective action and Sections 620.305 and

620.310 do not apply.

(Source:

Amended

Ill.

Reg.

____,

 effective

_____________)

Section

620.310

Preventive

Response

Activities

The

following

preventive

assessment

must

 be undertaken:

—12—

1)

 If a preventive notification under Section

620.305(c)

 is provided by a community water

supply:

A)

 The Agency shall notify the owner or operator

of any identified potential primary source,

potential secondary source, potential route,

or community water supply well that is

located within 2,500 feet of the wellhead.

B)

 The owner or operator notified under

subsection

 (a) (1) (A)

 shall, within 30 days of

the date of issuance of such notice, sample

each water well or monitoring well for the

contaminant identified in the notice if the

contaminant or material containing such

contaminant is or has been stored, disposed,

or otherwise handled at the site.

 If a

contaminant identified under Section

620.305(a)

 is detected, then the well must be

resampled within 30 days of the date on which

the first sample analyses are received.

 If a

contaminant identified under Section

620.305(a)

 is detected by the resampling,

 preventive notification must be given as set

forth in Section 620.305.

C)

 If the Agency receives analytical results

under subsection

 (a) (1) (B) that show a

contaminant identified under Section

620.305(a)

 has been detected, the Agency

shall:

i)

 Conduct a well site survey pursuant to

Section 17.1(d)

 of the Act,

 if such a

survey has not been previously conducted

within the last 5 years; and

ii)

 Identify those sites or activities which

represent a hazard to the continued

availability of groundwaters for public

use unless a groundwater protection

needs assessment has been prepared

pursuant to Section 17.1 of the Act.

2)

 If a preventive notification is provided under

Section 620.305(c)

 by a non-community water supply

or for multiple private water supply wells, the

Department of Public Health shall conduct a

sanitary survey within 1,000 feet of the welihead

of a non-community water supply or within 500 feet

—13—

of the wellheads for multiple private water supply

wells.

3)

 If a preventive notification under Section

620.305(b)

 is provided by the owner or operator of

a regulated entity and the applicable standard in

Subpart D has not been exceeded:

A)

 The appropriate regulatory agency shall

 determine if any of the following occurs for

Class

 I: Potable Resource Groundwater:

i)

 The levels set forth below are exceeded

or are changed for Ph:

Constituent

Criterion

(mg/l)

para—Dichlorobenzene

 0.005

ortho—Dichlorobenzene

0

•

01

Ethylbenzene

 0.03

Phenols

0.001

Styrene

0.01

Toluene

0.04

Xylenes

 0.02

ii)

 A statistically significant increase

occurs above background

 (as determined

pursuant to other regulatory procedures

(e.g., 35 Ill.

 Adm. Code 616, 724,

725

or 811))

 for arsenic, beryllium,

cadmium,

 chromium, cyanide,

 lead or

mercury or thallium (except due to

natural causes); or for aldicarb,

atrazine, carbofuran, dalapon, dinoseb,

endrin, endothall.

hexachlorocyclopentadiene,

 lindane

(gamma-hexachlorQcyclohexane),

 2, 4—D,

1, 1-dichloroethylene, cis-1,2-dichloro-

ethylene, trans-i, 2—dichloroethylene,

methoxychlor, monochlorobenzene,

Dicloram,

...~‘..

 2,4,5—TP (Silvex),

1,2,4—trichIcrcbèrzene.

1,1,2-

trichioroethane.

and

1,1, 1—trichloroethane.

iii)

 For a chemical constituent of gasoline,

 diesel fuel, or heating fuel,

the

constituent exceeds the following:

Constituent

Criterion

(mg

/

—14—

BETX

0.095

iv)

 For Ph, a statistically significant

change occurs from background.

(Board Note:

 Constituents that are carcinogens

have not been listed in subsection

 (a) (3) (A)

because the standard is set at the PQL and any

exceedence thereof is a violation subject to

corrective action.)

B)

 The appropriate agency shall determine if,

for Class III: Special Resource Groundwater,

the levels as determined by the Board are

exceeded.

C)

 The appropriate regulatory agency shall

consider whether the owner or operator

reasonably demonstrates that:

i)

 The contamination is a result of

contaminants remaining in groundwater

from a prior release for which

appropriate action was taken in

accordance with laws and regulations in

existence at the time of the release;

ii)

 The source of contamination is not due

to the on—site release of contaminants;

iii)

The detection resulted from error

in

sampling, analysis, or evaluation.

D)

 The appropriate regulatory agency shall

consider

actions

 necessary to minimize the

degree

and

extent

contamination.

The

appropriate

regulatory

agency

shall

determine

whether

preventative

response

must

undertaken

based on relevant factors including, but not limited

to, the considerations in subsection

 (a) (3).

C)

 After completion of preventive response pursuant to

authority of an appropriate regulatory agency, the

concentration of a contaminant listed in subsection

(a) (3) (A)

 in groundwater may exceed 50 percent of the

applicable numerical standard in Subpart D only if the

following conditions are met:

1)

 The exceedence has been minimized to the extent

practicable;

—15—

2)

 Beneficial use, as appropriate for the class of

groundwater, has been assured; and

3)

Any

threat to public health or the environment has

been minimized.

d)

 Nothing in this Section shall in any way limit the

authority of the State or of the United States to

require or perform any corrective action process.

(Source:

 Amended at 18 Ill.

 Reg.

____,

 effective

_____________)

SUBPART

GROUNDWATER

QUALITY

STANDARDS

Section

620.410

Groundwater

Quality

Standards

for

Class

Potable

Resource

Groundwater

Inorganic

Chemical

Constituents

Except due to natural causes or as provided in Section

620.450, concentrations of the following chemical

constituents

 must not be exceeded in Class I

groundwater:

Constituent

Units

Standard

Antimony

mci/L

0.006

Arsenic

mg/L

0.05

Barium

mg/L

Beryllium

mci/L

0.004

Boron

mg/L

Cadmium

mg/L

0.005

Chloride

mg/L

200

Chromium

mg/L

0.1

Cobalt

mg/L

Copper

mg/L

0.65

Cyanide

mg/L

0.2

Fluoride

mg/L

4.0

Iron

mg/L

Lead

mg/L

0.0075

Manganese

 mg/L

 0.15

Mercury

 mg/L

 0.002

Nickel

 mg/L

0.1

Nitrate as N

 mg/L

10

Radium-226

 pCi/L

20

Radium-228

 pCi/L

20

 Selenium

 mg/L

 0.05

Silver

 mg/L

 0.05

Sulfate

mg/L

400

Thallium

mcz/L

0.002

Total

Dissolved

Solids

(TDS)

mg/L

1,200

—16—

mg/L

b)

 Organic Chemical Constituents

Except due to natural causes or as provided in Section

620.450 or subsection

 (c), concentrations of the

following organic chemical constituents must not be

exceeded in Class I groundwater:

Constituent

Alachlor*

Aldicarb

Atrazme

Benzene*

Benzo (a) 1,vrene*

Carbofuran

Carbon Tetrachloride*

Chlordane*

Dalapon

Dichloromethane*

Di (2-ethvlhexyl)phthalate*

Dinoseb

Endotha 11

Endrin

~Ethy1ene

Dibromide*

Heptachlor*

Heptachlor

Epoxide*

Hexachlorocvclopentadiene

Lindane

(Gamlna-HexachlorQ

cyclohexane)

2,4

—D

ortho—Dichlorobenzene

para—Dichlorobenzene

1. 2-Dibromo-3-Chloropropane*

1, 2-Dichloroethane*

1, 1—Dichloroethylene

cis-1,

2—Dichloroethylene

trans—i,

2-Dichloroethylene

1, 2-Dichloropropane*

Ethylbenzene

Methoxychlor

Monochlorobenzene

Pentachlorophenol

*

Phenols

Picloram

Polychlorinated Biphenyls (PCB’s)

(as

decachloro-bipeh~nyl)

*

Simazine*

Styrene

2,4,5—TP

(Silvex)

Standard

(mg/L)

0.002

0.003

0.003

0.005

0. 0002

0.04

0.005

0.002

0.2

0.005

0.006

0.007

0.1

0.002

0. 00005

0. 0004

0. 0002

0.05

0. 0002

0.07

0.6

0.075

0. 0002

0.005

0.007

0.07

0.1

0.005

0.7

0.04

0.1

0.001

0.1

0.5

0.Q005

0.004

0.1

0.05

Zinc

5

—17—

Tetrachloroethylene*

•

005

Toluene

Toxaphene*

0.003

1,1,

1-Trichloroethane

0.2

1,1,

2-Trichloroethane

•

005

1,2 ,4-Trichlorobenzene

•

Trichloroethylene*

0.005

Vinyl

Chloride*

0.002

Xylenes

*Denotes

carcinogen.

C)

Complex

Organic

Chemical

Mixtures

Concentrations

the

 following chemical constituents

gasoline,

diesel

fuel,

heating

fuel

must

not

exceeded

Class

groundwater:

Constituent

Standard

(mg/L)

Benzene*

0.005

BETX

11.705

*Denotes

carcinogen.

Except

due

natural

causes,

range

6.5

—

9.0

units

must

not

exceeded

Class

groundwater.

Beta

Particle

and

Photon

Radioactivity

Except

due

natural

causes,

the

average

annual

concentration

beta

particle

and

photon

radioactivity

from

man—made

radionuclides

shall

not

exceed

dose

equivalent

the

total

body

organ

greater

than

mrem/year

Class

groundwater.

two

radionuclides

are

present,

the

sum

their

dose

equivalent

the

total

body,

any

internal

organ

shall

not

exceed 4 mrem/year in Class

 I groundwater except

due to natural causes.

2)

 Except for the radionuclides listed in subsection

(e) (3), the concentration of man—made

radionuclides causing

 4 arem total body or organ

dose equivalent must be calculated on the basis of

a

 2 liter per day drinking water intake using the

168—hour

data

accordance

with

the

procedure

set

forth

NCR?

Report

Number

22,

incorporated

reference

Section

620.125(a).

—18—

3)

 Except due to natural causes, the average annual

concentration assumed to produce a total body or

organ dose of 4 mrem/year of the following

chemical constituents shall not be exceeded in

 Class I groundwater:

Critical

 Standard

Constituent

 Orcian

 (Pci/i)

Tritium

 Total body

 20,000

Strontium—90

 Bone marrow

8

(Source:

 Amended at 18 Ill. Reg.

____,

 effective

____________)

Section 620.420

 Groundwater Quality Standards for Class

II:

General Resource Groundwater

a)

 Inorganic Chemical Constituents

Except

due

 to natural causes or as provided in

Section

620.450

subsection

(a)(3)

(d),

concentrations

the

following

chemical

constituents

must

not

exceeded

Class

groundwater:

Constituent

Standard

(mg/L)

Antimony

0.024

Arsenic

0.2

Barium

Beryllium

0.5

Cadmium

0.05

Chromium

Cobalt

1

Cyanide

0.6

Fluoride

4.0

Lead

0.1

Mercury

 0.01

Nitrate as N

100

Thallium

 0.02

2)

 Except as provided in Section 620.450 or

subsection

 (a) (3) or

 (d), concentrations of the

following chemical constituents must not be

exceeded in Class II groundwater:

Constituent

 Standard

(mg/L)

Boron

2.0

—19—

Chloride

200

Copper

 0.65

Iron

5

Manganese

Nickel

2

Selenium

0.05

Total

Dissolved

Solids

(TDS)

1,200

Sulfate

400

Zinc

3)

 The standard for any

inorganic

chemical

constituent

listed

 in subsection

 (a) (2), for

barium,

for

does

not

apply

groundwater

within

fill

material

within

the

upper

feet

parent

material

under

such

fill

material

site

not

within

the

rural

property

class

for

which:

Prior

the

effective

date

this

Part,

surf icial

characteristics

have

been

altered

the

placement

such

fill

material

impact

the

concentration

the

parameters

listed

subsection

(a)(3),

and

any

on—site

groundwater

monitoring

such

parameters

available

for

review

the

Agency.

the

effective

date

this

Part,

surficial

characteristics

are

the

process

being

altered

the

placement

such

fill

material,

which

proceeds

 reasonably

continuous

manner

completion,

impact

the

concentration

the

parameters

listed

subsection

(a)

 (3),

and

any

on-site

groundwater monitoring of such parameters is

available for review by the Agency.

For

purposes

subsection

(a)

(3),

the

term

“fill

material”

means

clean

earthen

 materials,

 slag,

ash,

clean

demolition

debris,

other

similar

materials.

Organic

Chemical

Constituents

Except

due

natural

causes

provided

Section 620.450 or subsection

 (b)(2)

or

 (d),

concentrations of the following organic chemical

constituents must not be exceeded in Class II

groundwater:

Constituent

Standard

(mg/L)

—20—

Alachlor*

 0.010

Aldicarb

 0.015

Atrazine

 0.015

Benzene*

 0.025

Benzo(a)Pvrene*

 0.002

Carbofuran

0.2

Carbon Tetrachloride*

 0.025

Chlordane*

 0.01

Dalapon

2.0

Dichloromethane*

 0.05

Dichloromethane

 0.05

Di(2—ethvlhexvl)phthalate*

 0.06

Dinoseb

 0.07

Endothall

Endrin

0.01

Ethylene

Dibromide*

0.0005

Heptachlor*

 0.002

Heptachlor Epoxide*

 0.001

HexachlorocycloDentadiene

0.5

Lindane

(Gamma-HexachlorQ

cyclohexane)

 0 •

001

2,4—D

 0.35

ortho—Dichlorobenzene

1.5

para-Dichlorobenzene

 0.375

1,2-Dibromo-3—Chloropropane*

 0.002

1, 2-Dichloroethane*

 0 •025

1,i-Dichioroethylene

 0.035

cis-i,

2-Dichloroethyiene

0.2

trans-i,2-Dichloroethylene

0.5

1, 2-Dichloropropane*

 • 025

Ethyibenzene

1.0

Methoxychlor

0.2

Monochiorobenzene

0.5

Pentachlorophenol*

0.005

Phenols

0.1

Picloram

Polychlorinated

Biphenyls

(PCB’s)

(as decachloro-biphenyl)*

 0.0025

Simazine*

0.04

Styrene

0.5

2,4,5—TP

 0.25

Tetrachloroethylene*

0.025

Toluene

2.5

Toxaphene*

 0.015

1,1,1—Trichloroethane

1.0

1,2.4—Trichlorobenzene

1,1 ,2—Trichloroethane

•

Trichloroethylene*

0.025

Vinyl

Chloride*

0.01

Xylenes

10

*Denotes

carcinogen.

—21—

2)

 The standards for pesticide chemical constituents

listed in subsection

 (b) (1) do not apply to

groundwater within 10 feet of the land surface,

provided that the concentrations of such

constituents result from the application of

pesticides in a manner consistent with the

requirements of the Federal Insecticide, Fungicide

and Rodenticide Act

 (7 U.S.C.

 136 et seq.) and the

Illinois

Pesticide

Act

 (Iii. Rev.

 Stat.

~

ch.

pars.

801

seq.)

415

ILCS

60/1

seci.J.

C)

Complex

Organic

Chemical

Mixtures

Concentrations

the

following

organic

chemical

constituents

gasoline,

diesel

fuel,

heating

fuel

must

not

exceeded

Class

groundwater:

Constituent

Standard

(mg/L)

Benzene*

0.025

BETX

13.525

*Denotes

carcinogen.

Except

due

natural

causes,

range

6.5

—

9.0

units

must

not

exceeded

Class

groundwater

that

within

feet

the

land

surface.

(Source:

Amended

Ill.

Reg.

____,

 effective

)

Req

 2?~~EO—~E564f

 57 Fed~

Rag. 3~776’~-3l8~9~

~&iTechlllgue~of

Water

Resources

Invasti~ations

the

~thuted

$t~tes

for Collection ~nt1Field 1naIys~.s~

~ainp1eE

Se1ecte~ Unstable

~

inccrporated

refere~ee

 at Se~tiOn~20~1’25~cr

other

procedures

 adopted ~

 th~ppr~bp~iate

regulatory

agency.~

Groundwater

eleVatIon

groundwater

~nitorin~

well

2~rnst~

~eter~nxned

and

reCQZ1~ed

i4~er~

~ecess~iy

 ~eterininethe grad±q~t~.

:3~

 The ar~aIyticaImethoaology used f~rthe analysis

of constituents in

5u)~pa~t~

and

~uzt

)~e

ConsistEnt

with both of ~.hef~1owjn~:

A)

 The nietbodoltgy ~

 ~tThr b~1ow

the preventive re~ponse1eve~L~

 of Subpart C

the

~roundwater

~tand~rd

set

forth

ir~

Subpart D, ~hicb~ver t~pc~h)~e~~nd

~3)

The

~icthodology

~u~t

bâoà~et~w~th

~ethodologie.s

cont~ine&’1~

eth~s~’for

Che~iea1

~Aria1ysis

~o&

 t~3~.na

 ~?aste~&’,

~ethods

f~r~

the

D~te~mi~tiott~

c~fOrgatuc

Compcrnnds in

Drinking

Wate~~X~ractica1

Cuiae for

Grrnnd-Water

~ampIi~g”~

‘~Test

~ethods

for

Evaluat.thg

~QUd

 14ast~s~.

~‘hysica1/chemica1~etho

 ~W-846)

~Techrdques ~f Water

Resoi~irc~esXnve~tigat1ons

~f the United States Ceologi~a?Survey,

Guadel~nesfor Collection and P1~d

~na.y~is

of

around-Water

Samples

for

Se1ectec~

Unstable

Const~tuent&1~thcorporate~ky

reference

é~ti

2.0

Reporting

Require~ents

 ~ini~u~, groundwater

~onitox1ng

ana1~tical

results

 must

~,ncl-ude

jnfor~ation~ procedures

ai~d

techniques

for~

Sanipie

collection

 (including but not lilited tc

of sa~nple

collector~

tine

and

date

the

~a~np1e~

method

 collection; and

Ldentlficatlor

of

the

~onitor~thg

1~cation~

and:: a

not

1ii~ted

field

quality

control~

—23—

the

~hairi

Section 620.605

 Issuance of a Health Advisory

a)

 The Agency shall issue a Health Advisory for a

chemical substance if all of the following conditions

are met:

1)

 A community water supply well is sampled and a

substance is detected and confirmed by resampling;

2)

 There is no standard under Section 620.410 for

such chemical substance; and

3)

 The chemical substance is toxic or harmful to

human health according to the procedures of

Appendix A,

 B, or C.

b)

 The Health Advisory must contain a general description

of the characteristics of the chemical substance, the

potential adverse health effects, and a guidance level

to be determined as follows:

1)

 If disease or functional impairment is caused due

to a physiological mechanism for which there is a

threshold dose below which no damage occurs, the

guidance level for any such substance is the

Maximum Contaminant Level Goal (“MCLG”), adopted

by USEPA for such substance,

 56 Fed. Reg. 26460-

26564, ~nd 56 Fed. Reg. 3526—3597, and 57 Fed.

Reci. 31776-31849, incorporated by reference at

Section 620.125.

 If there is no MCLG for the

substance, the guidance level is the Human

Threshold Toxicant Advisory Concentration for such

substance as determined in accordance with

Appendix A,

 unless the concentration for such

substance is less than the lowest appropriate PQL

specified in “Test Methods for Evaluating Solid

Wastes, Physical/Chemical Methods”, EPA

Publication No. SW-846

 (SW—846), incorporated by

reference at Section 620.125 for the substance.

If the concentration for such substance is less

than the lowest appropriate PQL for the substance

specified in SW-846, incorporated by reference at

—24—

Section 620.125, the guidance level is the lowest

appropriate PQL.

ORDERED

I, Dorothy M. Gunn,

 Clerk of the Illinois Pollution Control

Board, hereby certify that the above

 pinion and order was

adopted on the

~‘-~-~

 day of

____________________,

 1994, by

a vote of

 —o

~t.

~Dorothy M.

 unn, Clerk

Illinois ~91lution Control Board

(Source:

 Amended at 18 Ill.

 Reg.

____,

 effective

____________)