ILLINOIS POLLUTION CONTROL BOARD 
March 7, 2002 
 
IN THE MATTER OF: 
 ) 
 ) 
WASTEWATER PRETREATMENT           )     R02-9 
UPDATE, USEPA AMENDMENTS           )     (Identical-in-Substance 
(October 3, 2001) 
 )     Rulemaking - Public Water Supply) 
 
Adopted Rule.  Final Order. 
 
OPINION AND ORDER OF THE BOARD (by N.J. Melas): 
 
The Board received a motion for expedited consideration from the Illinois Environmental 
Protection Agency (Agency) and the Metropolitan Water Reclamation District of Greater 
Chicago (MWRDGC) on October 31, 2001.  By that motion, the Agency and the MWRDGC 
requested that the Board expedite consideration of certain amendments adopted by United States 
Environmental Protection Agency (USEPA) on October 3, 2001.  Those federal amendments are 
intended to implement the federal Project eXellence and Leadership (Project XL).  The joint 
motion requested that the Board incorporate the October 3, 2001 federal amendments into the 
wastewater pretreatment amendments proposed by the Board in Wastewater Pretreatment 
Update, USEPA Amendments (January 1, 2001 through June 30, 2001), R02-3 (Oct. 4, 2001). 
 
In its November 15, 2001 opinion and order, the Board granted this request and proposed 
corresponding amendments to the Illinois wastewater pretreatment regulations.  A Notice of 
Proposed Amendments appeared in the November 30, 2001 issue of the 
Illinois Register
, at 25 
 Ill. Reg. 15365.  The public comment period would have expired after 45 days, on January 14, 
2002.  The Illinois Environmental Protection Agency (Agency) filed comments on January 14, 
2002.  However, on January 24, 2002, the Board granted the January 11, 2002 request from 
USEPA that it be allowed to file comments until February 15, 2002.  USEPA filed its comments 
on February 15, 2002. 
 
In this opinion and order, the Board adopts as final amendments based on the October 3, 
2001 federal amendments.  In response to the Agency and USEPA comments that portions of the 
Board’s proposal were not truly “identical-in-substance” to the USEPA rules, the Board has 
deleted a segment of the rule proposed as 35 Ill. Adm. Code 310.930(b). 
 
Under Sections 7.2 and 13.3 of the Environmental Protection Act (Act) (415 ILCS 5/7.2 
and 13.3 (2000)), the Board today proposes amendments to the Illinois regulations that are 
“identical in substance” to wastewater pretreatment regulations that the USEPA adopted to 
implement Sections 307(b), (c), and (d) and 402(b)(8) and (b)(9) of the federal Water Pollution 
Control Act (FWPCA) (33 U.S.C. §§ 1317(b), (c), and (d) and 1342(b)(8) and (b)(9) (1994)).  
The federal action that underlies this docket includes the federal wastewater pretreatment 
amendments that USEPA adopted on October 3, 2001. 
 
 
 2
Sections 7.2 and 13.3 provide for quick adoption of regulations that are identical in 
substance to federal wastewater pretreatment regulations that USEPA adopts to implement 
Sections 307(b), (c), and (d) and 402(b)(8) and (b)(9) of the FWPCA.  Section 13.3 also provides 
that Title VII of the Act and Section 5 of the Administrative Procedure Act (APA) (5 ILCS 
100/5-35 and 5-40 (2000)) do not apply to the Board’s adoption of identical-in-substance 
regulations.  The federal wastewater pretreatment regulations are found at 40 C.F.R. 400 through 
499. 
 
The Board will promptly file these amendments with the Office of the Secretary of State. 
 
THE FEDERAL ACTION CONSIDERED IN THIS RULEMAKING 
 
On October 3, 2001 (at 66 Fed. Reg. 50334), USEPA amended the federal wastewater 
pretreatment regulations to facilitate its Project XL.  Project XL allows the imposition of 
alternative requirements to the generally applicable environmental regulations for the sake of 
achieving greater environmental benefits by alternative means.  The specific October 3, 2001 
Project XL action incorporated a new provision in the federal wastewater pretreatment 
regulations that would allow the State to issue permits that relax the generally applicable 
regulations in favor of imposing alternative requirements that would confer greater 
environmental benefits than would compliance with the generally applicable rules.  USEPA 
undertook the October 3, 2001 Project XL action for the immediate benefit of five publicly 
owned treatment works (POTWs), including the MWRDGC, which is regulated under the 
Illinois wastewater pretreatment program.
1
  The new provision added to the federal regulations, 
 however, is drafted broadly enough that it would apply to other POTWs in the future. 
 
PUBLIC COMMENTS 
 
The Board adopted a proposal for public comment in this matter on November 15, 2001.  
A Notice of Proposed Amendments appeared in the November 30, 2001 issue of the 
Illinois 
Register
, at 25 Ill. Reg. 15365.  The public comment period would have expired on January 14, 
2002, but the Board extended the public comment period until February 14, 2002 based on the 
January 11, 2002 request of USEPA.  The Board received public comments on this proposal until 
February 15, 2002.  During the comment period, the Board received the following two public 
comments: 
 
PC 1   Connie Tonsor, Associate Counsel, Special Assistant Attorney General, Division 
of Legal Counsel, Illinois Environmental Protection Agency (received January 
14, 2002) 
 
PC 2   David A Ullrich, Deputy Regional Administrator, United States Environmental 
Protection Agency (received February 15, 2002) 
 
1
 The other four POTWs are the following:  The Narragansett Bay Commission in Rhode Island, 
the Jeffersontown Wastewater Treatment Plant in Kentucky, the City of Albuquerque, New 
Mexico, and the City of Denton, Texas. 
 
 3
Both the Agency (by PC 1) and USEPA (by PC 2) requested that the Board change the 
proposal by removing proposed subsection (b).  The comments received and the Board’s 
response are described below in the discussion of the amendments. 
 
DISCUSSION 
 
The Board incorporated the October 3, 2001 federal amendments to the wastewater 
pretreatment regulations into the Illinois wastewater pretreatment regulations with minimal 
deviation from the federal text.  Persons interested in the substance of the underlying federal 
action should refer to the notice that appeared in the October 3, 2001 issue of the 
Federal 
Register
.  This discussion considers only incorporating the federal Project XL provision into the 
Illinois regulations.  The Board has found it necessary to deviate from the text of the federal 
regulations, and this discussion focuses on those deviations. 
 
The first addition to the federal text is the addition of a definition of “Project XL” to the 
Illinois regulations.  We added this definition to Section 310.110, the centralized body of 
definitions intended for use with the wastewater pretreatment regulations.  To define “Project 
XL” the Board referred to the federal “Project for eXcellence and Leadership” and facility-based 
and community-based regulatory reinvention projects as described in the two 
Federal Register
 
notices that announced initiation of the federal program.  On May 23, 1995, at 60 Fed. Reg. 
27282, USEPA announced the program for facility-based projects, and on November 1, 1995, at 
60 Fed. Reg. 55569, USEPA announced expansion of the program to include community-based 
projects.  The definition refers to both 
Federal Register
 notices.  The Board invites comment on 
our added definition of “Project XL.” 
 
A second deviation from the federal text relates to the structural changes made in 
adapting 40 C.F.R. 403 into the Illinois rules at 35 Ill. Adm. Code 310.  Many of the federal 
provisions have been divided into several Sections in the Illinois regulations.  Often, a single 
federal provision equates to a Subpart of Part 310 of the Illinois rules.  In codifying the new 
Project XL-related federal provision, 40 C.F.R. 403.20, the Board has modified the federal text 
to make the rule conform to this existing codification scheme.  The Board has codified new 40 
C.F.R. 403.20 as a single Section, 35 Ill. Adm. Code 310.930, but placed it in a new Subpart L, 
pertaining to federal Project XL agreements. 
 
A less desireable alternative was to place this new Section in existing Subpart K, which 
currently includes a few Sections based on 40 C.F.R. 403.18, relating to modification of 
pretreatment programs.  This alternative, however, would have required deviation from the 
existing structure of the Part 310, and it could lead to confusion of the two distinct subject 
matters of existing Subpart K and Section 310.930.  The Board requested comments on our 
creation of a new Subpart L for new Section 310.930, and none of the comments objected to this 
aspect of the proposal. 
 
A third set of deviations from the federal text relates to the structure of the rule.  The 
Board has divided the federal text into a preamble and two subsections, (a) and (b).  We believe 
that this division enhances the clarity of the text by separating the general ability of the Agency 
to issue permits based on Project XL agreements (in the preamble), the requirement for the 
 
 4
POTW to submit alternative requirements as a substantial program modification (in subsection 
(a)), and the requirement for inclusion of a reopener clause in the permit (in subsection (b)).  The 
Board invited comment on our division of the federally derived text into three segments to 
enhance the clarity of the rule, and none of the comments objected to this aspect of the proposal. 
 
Objections to and Deletion of Section 310.930(b) 
 
In this opinion and order the Board is eliminating a fourth set of deviations from the text 
of 40 C.F.R. 403.20 that appeared in the November 15, 2001 proposal for public comment.  
Those related to differences in the federal and Illinois regulatory schemes.  The Board is 
eliminating that fourth set of deviations from the text of the federal rule in response to the 
comments from the Agency and USEPA.  Despite the elimination of these deviations, the Board 
explains this set of amendments and considers the comments received in this segment of this 
opinion. 
 
At the federal level, one agency, USEPA, establishes general regulations, issues 
environmental permits, and grants exceptions or variances from the generally applicable rules.  
In Illinois, these functions are divided between the Agency and the Board.  The Board 
establishes the Illinois environmental standards and grants variances or adjusted standards from 
 those standards.  415 ILCS 5/5 (1998).  The Agency issues all environmental permits and 
participates directly with USEPA to resolve issues relating to the implementation of federal 
programs in Illinois.  415 ILCS 5/4 (1998).  Basically, this means that although the Agency 
participates with USEPA in the development of any Project XL agreement relating to an Illinois 
facility, which confers relief from the federal wastewater pretreatment requirements, the Board 
must grant any necessary relief from the Illinois regulations that may be needed to implement 
that Project XL agreement. 
 
The Act establishes the mechanisms that the Board must use to grant regulatory relief.  
These are by rulemaking (415 ILCS 5/27 and 28 (1998)), by an adjusted standard (415 ILCS 
5/28.1 (1998)), or by a variance (415 ILCS 5/35 through 28 (1998)).  In order for the 
implementation of a Project XL agreement to occur in accordance with Illinois law, the Board 
must grant one form of this relief or another from any regulation that would stand as an 
impediment to that implementation.  For this reason, in the proposal for public comment the 
Board had conditioned the authority of the Agency to authorize alternative requirements on 
fulfillment of the requirements of an added subsection (b). 
 
Subsection (b), as proposed, essentially provided for prior Board approval of a Project 
XL agreement before the Agency and the affected POTW may proceed to implement the 
agreement.  In this provision, the Board differentiated between the Project XL agreement 
involving the MWRDGC, which USEPA has essentially endorsed by rule, and any subsequent 
 Project XL agreements for which such federal approval by rule is unlikely.  In proposed 
subsection (b)(1) the Board approved (using the identical-in-substance rulemaking authority) to 
the August 30, 2001 agreement among the Agency, USEPA, and MWRDGC that prompted this 
action.  In proposed subsection (b)(2) the Board provided for Board approval of any subsequent 
Project XL agreements by alternative means. 
 
 
 5
The Board invited comment on proposed Section 310.930(b)(1) and (b)(2).  USEPA and 
the Agency both submitted adverse comments on the proposal.  Those comments have caused 
the Board to eliminate proposed subsection (b) in its entirety and make other corresponding 
changes in the text of this Section to reflect the removal.  Thus, proposed subsections (a)(1) and 
(a)(2) have become subsections (a) and (b), respectively, in the adopted amendments, and 
subsection (b), which included proposed subsections (b)(1) and (b)(2), has been removed. 
 
In PC 1, the Agency asserted that the Board exhibited a misunderstanding of the Project 
XL process in the pretreatment area.  The Agency further observed that the Board appeared to 
position itself to review USEPA actions.  The Agency further criticized the proposal in that it 
elevated the Project XL agreement to the status of an enforceable agreement, while the 
agreement itself provides that it is not enforceable against any party. 
 
In PC 2, USEPA similarly criticizes the addition of proposed subsection (b) as making 
the rule not identical-in-substance to the corresponding federal rule.  USEPA acknowledged that 
states may need to modify their regulations or statutes to allow for implementation of Project XL 
agreements, but took issue with the fact that proposed subsection (b) would have required the 
Board to grant relief from the Illinois regulations based on any future Project XL agreement. 
 
In response to the comments from USEPA and the Agency, proposed subsection (b) has 
been removed from the text of the amendments as adopted. 
 
General Revisions and Deviations from the Federal Text 
 
The following discussion begins with a description of the types of deviations the Board 
makes from the literal text of federal regulations in adopting identical-in-substance rules.  It is 
followed by a discussion of the amendments and actions undertaken in direct response to the 
federal actions involved in this proceeding.  This first series of discussions is organized by 
federal subject matter, generally appearing in chronological order of the relevant 
Federal 
Register
 notices involved.  Finally, this discussion closes with a description of the amendments 
and actions that are not directly derived from the federal actions. 
 
In incorporating the federal rules into the Illinois system, some deviation from the federal 
text is unavoidable.  This deviation arises primarily through differences between the federal and 
state regulatory structure and systems.  Some deviation also arises through errors in and 
problems with the federal text itself.  The Board conforms the federal text to the Illinois rules 
 and regulatory scheme and corrects errors that we see in the text as we engage in these routine 
update rulemakings. 
 
In addition to the amendments derived from federal amendments, the Board often finds it 
necessary to alter the text of various passages of the existing rules as provisions are opened for 
update in response to USEPA actions.  This involves correcting deficiencies, clarifying 
provisions, and making other changes that are necessary to establish a clear set of rules that 
closely parallel the corresponding federal requirements within the codification scheme of the 
Illinois Administrative Code. 
 
 
 6
The Board updates the citations to the 
Code of Federal Regulations
 to the most recent 
version available.  As of the date of this opinion, the most recent version of the 
Code of Federal 
Regulations
 available to the Board is the July 1, 2000 version.  Thus, we have updated all 
citations to the 2000 version, adding references to later amendments using their appropriate 
Federal Register
 citation, where necessary. 
 
The Board has assembled a table to aid in the location of these alterations and to briefly 
outline their intended purpose.  The table sets forth the miscellaneous corrections to the pre-
amended base text of the rules in detail.  The table is set forth and explained beginning on the 
next page of this opinion and order.  There is no further discussion of most of the deviations and 
 revisions elsewhere in this opinion. 
 
Discussion of Miscellaneous Housekeeping Amendments 
 
The tables below list numerous corrections and amendments that are not based on current 
federal amendments.  The first table (beginning immediately below) includes deviations made in 
this Proposal for Public Comment from the verbatim text of the federal amendments.  The 
second table (beginning below at page 7) contains corrections and clarifications that the Board 
made in the base text involved in this proposal.  The amendments listed in this second table are 
not directly derived from the current federal amendments.  Some of the entries in these tables are 
discussed further in appropriate segments of the general discussion beginning at page 4 of this 
opinion.  Table 3 (beginning on page 11 below) is a listing of revisions made to the text of the 
amendments from that proposed and set forth in the Board’s opinion and order of November 15, 
2001.  Table 3 indicates the changes made, as well as the source that suggested each of the 
changes. 
 
Table 1: 
Deviations from the Text of the Federal Amendments 
 
Illinois Section 
 40 C.F.R. Section 
 Revision(s) 
310.930 preamble 
 403.20 
 Added the precondition “once the POTW 
. . .”; changed “approval authority” to 
“Agency”; added parenthetical “by a 
permit. . . . the Act” offset by commas; 
changed “publicly owned treatment works 
(POTW)” to the defined abbreviation 
 “POTW”; removed the quotation marks 
from the defined term, “Project XL”; 
added the precondition “approved under 
subsection (b)”; removed unnecessary 
capitalization from pretreatment program” 
310.930(a) 
 403.20 
 Subdivided the text and added the 
subsection designation; changed 
“§ 403.18” to “Subpart K of this Part”; 
added “before the POTW may implement 
it” 
 
 7
310.930(b) 
 403.20 
 Subdivided the text and added the 
subsection designation; changed 
“approval authority” to “Agency” (twice); 
used lower-case “local pilot pretreatment 
program”; added “embodied in the Project 
XL agreement”; removed the quotation 
marks from the defined term, “Project 
XL”; added “pursuant to its own terms” 
 
Table2 : 
Board Housekeeping Amendments 
 
Section Source 
 Revision(s) 
310. table of contents 
 Board 
 Added new Subpart L designation 
310.110 “Act” 
 Board 
 Changed the Illinois Revised Statutes citation to the 
Illinois Compiled Statutes citation 
310.110 “Approval 
Authority” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “approved 
POTW pretreatment 
program” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “approved 
POTW pretreatment 
program” 
Board 
 Changed “which” to “that” for a restrictive relative 
clause 
310.110 “authorization 
to discharge” 
Board 
 Changed “which” to “that” for a restrictive relative 
clause 
310.110 “blowdown” 
Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “CWA” 
Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “indirect 
discharge” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “industrial 
user” 
Board 
 Removed the quotation marks from the subsequent 
appearance of the defined term, “industrial user”; added 
“the person” to complete the sentence in each 
paragraph subdivision (six times); changed the ending 
periods to semicolons (five times); used lower case for 
the conjunction “or” and deleted the ending comma 
310.110 “industrial 
user” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
 
 8
310.110 “interference” 
 Board 
 Changed “which” to “that” for a restrictive relative 
clause; changed “both” to “for which both of the 
following is true”; added “the discharge” (three times); 
changed “therefore” to “as a result of the inhibition of 
disruption” as a parenthetical offset by a comma; 
removed the quotation marks from the term, “sludge 
requirements” 
310.110 “interference” 
Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “new source” 
 Board 
 Removed the quotation marks from the term, “new 
source” 
310.110 “new source” 
Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “noncontact 
cooling water” 
Board 
 Changed “which” to “that” for a restrictive relative 
clause 
310.110 “noncontact 
cooling water” Board 
note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “noncontact 
cooling water 
pollutants” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “NPDES 
permit” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “pass 
through” 
Board 
 Changed “which” to “that” for a restrictive relative 
clause 
310.110 “pass 
through” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “person” 
 Board 
 Added a comma to separate the final element of a series 
310.110 “person” 
Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “pollutant” 
 Board 
 Changed commas to semicolons to separate the 
elements of a series containing a sub-series (15 times); 
added a semicolon to separate the final element of a 
series containing a sub-series; added a comma to 
separate the final element of a series 
310.110 “pollutant” 
Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “pollution” 
 Board 
 Added a comma to separate the final element of a series 
310.110 “pollution” 
Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “POTW 
treatment plant” 
Board 
 Changed “which” to “that” for a restrictive relative 
clause 
310.110 “POTW 
treatment plant” Board 
note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
 
 9
310.110 
“pretreatment” 
Board 
 Changed “which” to “that” for a restrictive relative 
clause 
310.110 
“pretreatment” Board 
note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “pretreatment 
permit” 
Board 
 Changed “which” to “that” for a restrictive relative 
clause 
310.110 “pretreatment 
requirements” Board 
note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “pretreatment 
standard” 
Board 
 Added a comma to separate the final element of a 
series; changed “which” to “that” for a restrictive 
relative clause 
310.110 “pretreatment 
standard” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “process 
wastewater” 
Board 
 Changed “which” to “that” for a restrictive relative 
clause 
310.110 “process 
wastewater” Board 
note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “process 
wastewater pollutants” 
Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “Project XL” 
 Board 
 Added the definition of the term “Project XL” 
310.110 “publicly 
owned treatment 
works” 
Board 
 Added a comma to separate the final element of a series 
(twice); changed “which” to “that” for a restrictive 
relative clause (twice) 
310.110 “publicly 
owned treatment 
works” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “schedule of 
compliance” Board 
note 
Board 
 Updated the cited version of the 
Code of Federal 
 Regulations 
to the latest edition available 
310.110 “significant 
industrial user” 
Board 
 Added a comma to separate the final element of a 
series; changed “which” to “that” for a restrictive 
relative clause 
310.110 “significant 
industrial user” Board 
note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “sludge 
requirements” Board 
note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “submission” 
Board note  
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
 
 10
310.110 “treatment 
works” 
Board 
 Added a comma to separate the final element of a series 
(twice) 
310.110 “treatment 
works” Board note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.110 “unit of local 
government” 
Board 
 Removed the quotation marks from the subsequent 
appearance of the defined term, “industrial user” 
310.110 “unit of local 
 government” Board 
note 
Board 
 Updated the cited version of the 
Code of Federal 
Regulations 
to the latest edition available 
310.Subpart L 
 Board 
 Added the new Subpart heading 
 
Table 3: 
Revisions to the Text of the Proposed Amendments in Final Adoption 
 
Section Revised 
 Source(s) of 
Revision(s) 
Revision(s) 
310 table of contents 
Section 310.930 
heading 
Board 
 Changed “federally-approved” to “federally 
approved” 
310.930 heading 
 Board 
 Changed “federally-approved” to “federally 
approved” 
310.930 preamble 
 Board, 
USEPA, 
Agency 
Changed “fulfilled the requirements of subsection (b) 
of this Section” to “entered into a federally approved 
pretreatment program reinvention pilot project under 
Project XL”; changed “any” to “that”; removed “that 
has a final Project XL agreement approved under 
Subsection (b)” 
310.930(a) Board, 
USEPA, 
Agency 
Renumbered the subsection from subsection (a)(1) to 
reflect the deletion of proposed subsection (b) 
310.930(b) Board, 
USEPA, 
Agency 
Renumbered the subsection from subsection (a)(2) to 
reflect the deletion of proposed subsection (b) 
310.930 Board note 
 Board 
 Added a reference to the federal provision from which 
 this Section derives and referencing the Project XL 
agreement relating to the MWRDGC 
 
ORDER 
 
The complete text of the proposed amendments follows: 
 
TITLE 35:  ENVIRONMENTAL PROTECTION 
SUBTITLE C:  WATER POLLUTION 
CHAPTER I:  POLLUTION CONTROL BOARD 
 
 
 11
PART 310 
PRETREATMENT PROGRAMS 
 
SUBPART A:  GENERAL PROVISIONS 
Section 
310.101 Applicability 
310.102 Objectives 
310.103 Federal Law 
310.104 State Law 
310.105 Confidentiality 
310.107      Incorporations by Reference 
310.110 Definitions 
310.111 New Source 
 
SUBPART B:  PRETREATMENT STANDARDS 
Section 
310.201 General Prohibitions 
310.202 Specific Prohibitions 
310.210      Specific Limits Developed by POTW 
310.211 Local Limits 
310.220 Categorical Standards 
310.221      Category Determination Request 
310.222      Deadline for Compliance with Categorical Standards 
310.230      Concentration and Mass Limits 
310.232 Dilution 
310.233      Combined Wastestream Formula 
 
SUBPART C:  REMOVAL CREDITS 
Section 
310.301 Special Definitions 
310.302 Authority 
310.303      Conditions for Authorization to Grant Removal Credits 
310.310      Calculation of Revised Discharge Limits 
310.311      Demonstration of Consistent Removal 
 310.312 Provisional Credits 
310.320      Compensation for Overflow 
310.330      Exception to POTW Pretreatment Program 
310.340      Application for Removal Credits Authorization 
310.341 Agency Review 
310.343      Assistance of POTW 
310.350      Continuation of Authorization 
310.351      Modification or Withdrawal of Removal Credits 
 
SUBPART D:  PRETREATMENT PERMITS 
Section 
310.400 Preamble 
 
 12
310.401 Pretreatment Permits 
310.402      Time to Apply 
310.403 Imminent Endangerment 
310.410 Application 
310.411      Certification of Capacity 
310.412 Signatures 
310.413 Site Visit 
310.414 Completeness 
310.415 Time Limits 
310.420      Standard for Issuance 
310.421 Final Action 
310.430 Conditions 
310.431      Duration of Permits 
310.432      Schedules of Compliance 
310.441      Effect of a Permit 
310.442 Modification 
310.443 Revocation 
310.444 Appeal 
 
SUBPART E:  POTW PRETREATMENT PROGRAMS 
Section 
310.501      Pretreatment Programs Required 
310.502      Deadline for Program Approval 
310.503      Incorporation of Approved Programs in Permits 
310.504      Incorporation of Compliance Schedules in Permits 
310.505      Reissuance or Modification of Permits 
310.510      Pretreatment Program Requirements 
310.521 Program Approval 
310.522      Contents of Program Submission 
310.524      Content of Removal Allowance Submission 
310.531 Agency Action 
310.532 Defective Submission 
310.533      Water Quality Management 
310.541      Deadline for Review 
310.542      Public Notice and Hearing 
310.543 Agency Decision 
310.544 USEPA Objection 
310.545      Notice of Decision 
310.546      Public Access to Submission 
310.547 Appeal 
 
SUBPART F:  REPORTING REQUIREMENTS 
Section 
310.601      Definition of Control Authority 
310.602 Baseline Report 
310.603 Compliance Schedule 
 
 13
310.604      Report on Compliance with Deadline 
310.605      Periodic Reports on Compliance 
310.606      Notice of Potential Problems 
310.610      Monitoring and Analysis 
310.611      Requirements for Non-Categorical Standard Users 
310.612      Annual POTW Reports 
310.613      Notification of Changed Discharge 
310.621      Compliance Schedule for POTW’s 
310.631      Signatory Requirements for Industrial User Reports 
310.632      Signatory Requirements for POTW Reports 
310.633      Fraud and False Statements 
310.634 Recordkeeping Requirements 
310.635      Notification of Discharge of Hazardous Waste 
 
SUBPART G:  FUNDAMENTALLY DIFFERENT FACTORS 
Section 
310.701      Definition of Requester 
310.702      Purpose and Scope 
310.703 Criteria 
 310.704      Fundamentally Different Factors 
310.705      Factors which are Not Fundamentally Different 
310.706      More Stringent State Law 
310.711 Application Deadline 
310.712      Contents of FDF Request 
310.713 Deficient Requests 
310.714 Public Notice 
310.721      Agency Review of FDF Requests 
310.722      USEPA Review of FDF Requests 
 
SUBPART H:  ADJUSTMENTS FOR POLLUTANTS IN INTAKE 
Section 
310.801      Net/Gross Calculation by USEPA 
 
SUBPART I:  UPSETS 
Section 
310.901 Definition 
310.902      Effect of an Upset 
310.903      Conditions Necessary for an Upset 
310.904      Burden of Proof 
310.905      Reviewability of Claims of Upset 
310.906      User Responsibility in Case of Upset 
 
SUBPART J:  BYPASS 
Section 
310.910 Definition 
310.911      Bypass Not Violating Applicable Pretreatment Standards or Requirements 
 
 14
310.912 Notice 
310.913      Prohibition of Bypass 
 
SUBPART K:  MODIFICATION OF POTW PRETREATMENT PROGRAMS 
Section 
310.920 General 
310.921      Substantial Modifications Defined 
310.922      Approval Procedures for Substantial Modifications 
310.923      Approval Procedures for Non-Substantial Modifications 
310.924      Incorporation of Modifications into the Permit 
310.930      Federally-Approved Pretreatment Program Reinvention Pilot Projects Under 
Project XL 
 
SUBPART L:  FEDERAL PROJECT XL AGREEMENTS 
Section 
310.930      Federally Approved Pretreatment Program Reinvention Pilot Projects Under 
Project XL 
 
AUTHORITY:  Implementing and authorized by Sections 7.2, 13, 13.3, and 27 of the 
Environmental Protection Act [415 ILCS 5/7.2, 13, 13.3 and 27]. 
 
SOURCE:  Adopted in R86-44 at 12 Ill. Reg. 2502, effective January 13, 1988; amended in R88-
18 at 13 Ill. Reg. 2463, effective January 31, 1989; amended in R89-3 at 13 Ill. Reg. 19243, 
effective November 27, 1989; amended in R89-12 at 14 Ill. Reg. 7608, effective May 8, 1990; 
amended in R91-5 at 16 Ill. Reg. 7346, effective April 27, 1992; amended in R95-22 at 20 Ill. 
Reg. 5533, effective April 1, 1996; amended in R96-12 at 20 Ill. Reg. 10671, effective July 24, 
1996; amended in R97-7 at 21 Ill. Reg. 5163, effective April 10, 1997; amended in R98-23 at 22 
Ill. Reg. 11465, effective June 22, 1998; amended in R99-17 at 23 Ill. Reg. 8412, effective July 
12, 1999; amended in R00-7 at 24 Ill. Reg. 2372, effective January 26, 2000; amended in R00-15 
at 24 Ill. Reg. 11633, effective July 24, 2000; amended in R01-5 at 25 Ill. Reg. 1322, effective 
January 11, 2001; amended in R01-25 at 25 Ill. Reg. 10860, effective August 14, 2001; amended 
in R02-3 at 26 Ill. Reg. 4008, effective February 28, 2002; amended in R02-9 at 26 Ill. Reg. 
________, effective ______________________. 
 
SUBPART A:  GENERAL PROVISIONS 
 
Section 310.110      Definitions 
 
“Act” means the Environmental Protection Act (Ill. Rev. Stat. 1991, ch. 111 1/2, 
 par. 1001 et seq.) [415 ILCS 5]. 
 
“Agency” means the Illinois Environmental Protection Agency. 
 
“Approval Authority” means the Agency. 
BOARD NOTE: Derived from 40 CFR 403.3(c) (1991) (2000). 
 
 
 15
“Approved POTW Pretreatment Program” or “Program” or “POTW Pretreatment 
Program” means a program administered by a POTW which that has been 
approved by the Agency in accordance with Sections 310.541 through 310.546. 
BOARD NOTE: Derived from 40 CFR 403.3(d) (1991) (2000). 
 
“Authorization to discharge” means an authorization issued to an industrial user 
by a POTW which that has an approved pretreatment program.  The authorization 
may consist of a permit, license, ordinance or other mechanism as specified in the 
approved pretreatment program. 
 
“Blowdown” means the minimum discharge of recirculating water for the purpose 
of discharging materials contained in the water, the further buildup of which 
would cause concentration in amounts exceeding limits established by best 
engineering practice. 
BOARD NOTE: Derived from 40 CFR 401.11(p) (1991) (2000). 
 
“Board” means the Illinois Pollution Control Board. 
 
“CWA” means Federal Water Pollution Control Act, also known as the Clean 
Water Act, as amended, incorporated by reference in Section 310.107. 
BOARD NOTE: Derived from 40 CFR 403.3(b) (1991) (2000). 
 
“Control authority” is as defined in Section 310.601. 
 
“Indirect Discharge” or “Discharge” means the introduction of pollutants into a 
 POTW from any non-domestic source regulated under Section 307(b), (c) or (d) 
of the CWA (33 U.S.C. 1317(b), (c) or (d)). 
BOARD NOTE: Derived from 40 CFR 403.3(g) (1991) (2000). 
 
“Industrial User” or “User” means a source of indirect discharge.  As used in this 
Part, an “industrial user” includes any person who meets any of the following 
criteria: 
 
Discharges The person discharges toxic pollutants as defined by 35 Ill. 
Adm. Code 307.1005.; 
 
Is The person is subject to a categorical standard adopted or incorporated 
by reference in 35 Ill. Adm. Code 307.; 
 
Discharges The person discharges more than 15% of the total hydraulic 
flow received by the POTW treatment plant.; 
 
Discharges The person discharges more than 15% of the total biological 
loading of the POTW treatment plant as measured by the 5-day 
biochemical oxygen demand.; 
 
 
 16
Has The person has caused pass through or interference.  Or,; or 
 
Has The person has presented an imminent endangerment to the health or 
welfare of persons. 
 
BOARD NOTE:  Derived from 40 CFR 403.3(h) (1991) (2000). 
 
“Industrial wastewater” means waste of a liquid nature discharged by an 
industrial user to a sewer tributary to a POTW. 
 
“Interference” means a discharge which, alone or in conjunction with a discharge 
or discharges from other sources, for which both of the following is true: 
 
Inhibits The discharge inhibits or disrupts the POTW, its treatment 
processes or operations, or its sludge processes, use or disposal; and 
 
Therefore As a result of the inhibition of disruption, the discharge is a 
cause of a violation of any requirement of the POTW's NPDES permit 
(including an increase in the magnitude or duration of a violation) or of 
the prevention of sewage sludge disposal in compliance with any “sludge 
requirements.” 
 
BOARD NOTE:  Derived from 40 CFR 403.3(i) (1991) (2000). 
 
“Municipal sewage” is sewage treated by a POTW exclusive of its industrial 
component. 
 
“Municipal sludge” is sludge produced by a POTW treatment works. 
 
“Municipality.” See “unit of local government.” 
 
“New source” means “new source” as defined in Section 310.111. 
BOARD NOTE:  Derived from 40 CFR 401.11(c) and 403.3(k) (1991) (2000). 
 
“Noncontact cooling water” means water used for cooling which that does not 
come into direct contact with any raw material, intermediate product, waste 
product or finished product. 
BOARD NOTE:  Derived from 40 CFR 401.11(n) (1991) (2000). 
 
“Noncontact cooling water pollutants” means pollutants present in noncontact 
cooling waters. 
BOARD NOTE:  Derived from 40 CFR 401.11(o) (1991) (2000). 
 
“NPDES Permit” means a permit issued to a POTW pursuant to Section 402 of 
the CWA, or Section 12(f) of the Act and 35 Ill. Adm. Code 309.Subpart A. 
BOARD NOTE:  Derived from 40 CFR 403.3(l) (1991) (2000). 
 
 17
 
“O and M” means operation and maintenance. 
 
“Pass through” means a discharge of pollutants which that exits the POTW into 
waters of the State in quantities or concentrations which, alone or in conjunction 
with a discharge or discharges from other sources, is a cause of a violation of any 
requirement of the POTW's NPDES permit (including an increase in the 
magnitude or duration of a violation). 
BOARD NOTE:  Derived from 40 CFR 403.3(n) (1991) (2000). 
 
“Person” means an individual, corporation, partnership, association, State, “unit 
of local government” or any interstate body.  This term includes the United States 
government, the State of Illinois, and their political subdivisions. 
BOARD NOTE:  Derived from 40 CFR 401.11(m) (1991) (2000) and 33 U.S.C. 
1362(5). 
 
“Pollutant” means dredged spoil,; solid waste,; incinerator residue,; sewage,; 
garbage,; sewage sludge,; munitions,; chemical wastes,; biological materials,; 
radioactive materials,; heat,; wrecked or discarded equipment,; rock,; sand,; cellar 
dirt; and industrial, municipal, and agricultural waste discharged into a sewer. 
BOARD NOTE:  Derived from 40 CFR 401.11(f) (1991) (2000). 
 
“Pollution” means the man-made or man-induced alteration of the chemical, 
physical, biological, and radiological integrity of water. 
BOARD NOTE:  Derived from 40 CFR 401.11(g) (1991) (2000). 
 
“POTW” means “Publicly Owned Treatment Works,” which is defined below. 
 
“POTW Treatment Plant” means that portion of the POTW which that is designed 
 to provide treatment (including recycling and reclamation) of municipal sewage 
and industrial wastewater. 
BOARD NOTE:  Derived from 40 CFR 403.3(p) (1991) (2000). 
 
“Pretreatment” means the reduction of the amount of pollutants, the elimination 
of pollutants or the alteration of the nature of pollutant properties in wastewater 
prior to or in lieu of discharging or otherwise introducing such pollutants into a 
POTW.  The reduction or alteration may be obtained by physical, chemical or 
biological processes, process changes or by other means, except as prohibited by 
Section 310.232.  Appropriate pretreatment technology includes control 
equipment, such as equalization tanks or facilities, for protection against surges or 
slug loadings which that might interfere with or otherwise be incompatible with 
the POTW.  However, where wastewater from a regulated process is mixed in an 
equalization facility with unregulated wastewater or with wastewater from 
another regulated process, the effluent from the equalization facility must meet an 
adjusted pretreatment limit calculated in accordance with Section 310.233. 
BOARD NOTE:  Derived from 40 CFR 403.3(q) (1991) (2000). 
 
 18
 
“Pretreatment permit” means an authorization to discharge to a sewer which that 
is issued by the Agency as the control authority. 
 
“Pretreatment requirements” means any substantive or procedural requirement 
related to pretreatment, other than a pretreatment standard, imposed on an 
industrial user. 
BOARD NOTE:  Derived from 40 CFR 403.3(r) (1991) (2000). 
 
“Pretreatment standard,” or “standard” means any regulation containing pollutant 
discharge limits promulgated by USEPA, and incorporated by reference in 35 Ill. 
Adm. Code 307.  This term includes prohibitive discharge limits established 
pursuant to Section 310.201 through 310.213 or 35 Ill. Adm. Code 307.1101.  
This term also includes more stringent prohibitions and standards adopted by the 
Board in this Part or 35 Ill. Adm. Code 307, including 35 Ill. Adm. Code 
307.1101, 307.1102, and 307.1103.  The term also includes local limits pursuant 
to Section 310.211 which that are a part of an approved pretreatment program. 
BOARD NOTE:  Derived from 40 CFR 403.3(j) (1991) (2000). 
 
“Process wastewater” means any water which that, during manufacturing or 
processing, comes into direct contact with or results from the production or use of 
any raw material, intermediate product, finished product, by-product, or waste 
product. 
BOARD NOTE:  Derived from 40 CFR 401.11(q) (1991) (2000). 
 
“Process wastewater pollutants” means pollutants present in process wastewater. 
BOARD NOTE:  Derived from 40 CFR 401.11(r) (1991) (2000). 
 
“Project XL” means the federal Project for eXcellence and Leadership or a 
federally approved facility- or community-based regulatory reinvention (XL) pilot 
project, as such are described in the Federal Register notices of May 23, 1995 (60 
Fed. Reg. 27282) and November 1, 1995 (60 Fed. Reg. 55569). 
 
“Publicly owned treatment works” or “POTW” means a “treatment works” which 
that is owned by the State of Illinois or a “unit of local government.” This 
definition includes any devices and systems used in the storage, treatment, 
recycling, and reclamation of municipal sewage or industrial wastewater.  It also 
includes sewers, pipes, and other conveyances only if they convey wastewater to 
a POTW treatment plant.  The term also means the “unit of local government” 
which that has jurisdiction over the indirect discharges to and the discharges from 
such a treatment works. 
BOARD NOTE:  Derived from 40 CFR 403.3(o) (1991) (2000). 
 
“Schedule of compliance” means a schedule of remedial measures included in an 
authorization to discharge or a pretreatment permit, or an NPDES permit, 
including an enforceable sequence of interim requirements (for example, actions, 
 
 19
operations or milestone events) leading to compliance with this Part and 35 Ill. 
Adm. Code 307.  A schedule of compliance does not protect an industrial user or 
POTW from enforcement. 
BOARD NOTE:  Derived from 40 CFR 401.11(m) (1991) (2000) and 33 U.S.C. 
1362(17). 
 
“Significant industrial user” means as follows: 
 
All industrial users subject to categorical pretreatment standards under 
Section 310.220 through 310.233 and 35 Ill. Adm. Code 307, and 
 
Any other industrial user that discharges an average of 25,000 gallons per 
day or more of process wastewater to the POTW (excluding sanitary, 
 noncontact cooling, and boiler blowdown wastewater); contributes a 
process wastestream which that makes up five percent or more of the 
average dry weather hydraulic or organic capacity of the POTW treatment 
plant; or is designated as such by the control authority, as defined in 
Section 310.601, on the basis that the industrial user has a reasonable 
potential for adversely affecting the POTW's operation or for violating any 
pretreatment standard or requirement (in accordance with Section 
310.510(f)); except, upon a finding that an industrial user meeting the 
criteria of this second subsection of this definition has no reasonable 
potential for adversely affecting the POTW's operation of for violating any 
pretreatment standard or requirement, the control authority, as defined in 
Section 310.601, may at any time, on its own initiative or in response to a 
petition received from an industrial user or POTW may determine in 
accordance with Section 310.510(f) that such industrial user is not a 
significant industrial user. 
 
BOARD NOTE:  Derived from 40 CFR 403.3(t) (1991) (2000). 
 
“Sludge requirements” means any of the following permits or regulations: 35 Ill. 
Adm. Code 309.155 (NPDES Permits), 309.208 (Permits for Sites Receiving 
Sludge for Land Application), 703.121 (RCRA Permits), 807.202 (Solid Waste 
Permits), the Toxic Substances Control Act (15 U.S.C. 2601) or the Marine 
Protection, Research and Sanctuaries Act (33 U.S.C. 1401), Section 39(b) of the 
Act (NPDES Permits), and Section 405(b) of the Clean Water Act (federally-
 imposed sludge use and management requirements). 
BOARD NOTE:  Derived from 40 CFR 403.3(i) and 403.7(a) (1991) (2000). 
 
“Submission” means a request to the Agency by a POTW for approval of a 
pretreatment program, or for authorization to grant removal credits. 
BOARD NOTE:  Derived from 40 CFR 403.3(t) (1991) (2000). 
 
“Treatment works” is as defined in 33 U.S.C. 1292(2) (1987).  It includes any 
devices and systems used in the storage, treatment, recycling, and reclamation of 
 
 20
municipal or industrial wastewater to implement 33 U.S.C. 1281, or necessary to 
recycle or reuse water at the most economical cost over the estimated life of the 
works, including intercepting sewers, outfall sewers, sewage collection systems, 
pumping, power, and other equipment. 
BOARD NOTE:  Derived from 40 CFR 403.3(o) (1991) (2000) and 33 U.S.C. 
1292(2). 
 
“Unit of local government” means a unit of local government, as defined by Art. 
7, Sec. 1 of the Illinois Constitution, having jurisdiction over disposal of sewage.  
“Unit of local government” includes, but is not limited to, municipalities and 
sanitary districts. 
BOARD NOTE:  Derived from 40 CFR 401.11(m) (1991) (2000) and 33 U.S.C. 
1362(4). 
 
“USEPA” means the United States Environmental Protection Agency. 
 
(Source:  Amended at 26 Ill. Reg. ________, effective ______________________) 
 
SUBPART L:  FEDERAL PROJECT XL AGREEMENTS 
 
Section 310.930      Federally Approved Pretreatment Program Reinvention Pilot Projects 
Under Project XL 
 
Once a POTW has entered into a federally approved pretreatment program reinvention pilot 
project under Project XL, the Agency may, by a permit issued pursuant to Section 39 of the Act, 
allow that POTW to implement a pretreatment program that includes legal authorities and 
requirements that are different than the administrative requirements otherwise applicable under 
this Part. 
 
a)     The POTW must submit any such alternative requirements as a substantial 
program modification in accordance with the procedures outlined in Subpart K of 
this Part.  The approved modified program must be incorporated as an enforceable 
part of the POTW’s NPDES permit before the POTW may implement it. 
 
b)     The Agency must include a reopener clause in the POTW’s NPDES permit that 
directs the POTW to discontinue implementing the approved alternative 
requirements and resume implementation of its previously approved pretreatment 
program if the Agency determines that the primary objectives of the local pilot 
pretreatment program embodied in the Project XL agreement are not being met or 
the Project XL agreement expires or is otherwise terminated pursuant to its own 
terms. 
 
BOARD NOTE:  Derived from 40 CFR 403.20, as added at 66 Fed. Reg. 50336 (October 3, 
2001).  A Project XL agreement among the Metropolitan Water Reclamation District of Greater 
Chicago, the Agency, and USEPA and described at 66 Fed. Reg. 50336 (October 3, 2001) 
received final approval by USEPA and the Agency on August 30, 2001. 
 
 21
 
(Source:  Added at 26 Ill. Reg. ________, effective ______________________) 
 
I, Dorothy M. Gunn, Clerk of the Illinois Pollution Control Board, certify that the Board 
adopted the above opinion and order on March 7, 2002, by a vote of 7-0. 
 
 
Dorothy M. Gunn, Clerk 
Illinois Pollution Control Board