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TITLE 327 WATER POLLUTION CONTROL DIVISION

SECOND NOTICE OF COMMENT PERIOD LSA Document #14-58

AQUATIC LIFE AND HUMAN HEALTH AMBIENT WATER QUALITY CRITERIA FOR METALS

PURPOSE OF NOTICE

The Indiana Department of Environmental Management (IDEM) is soliciting public comment on amendments to rules at 327 IAC 2-1-6 and 327 IAC 2-1.5-8 to revise Indiana's aquatic life and human health ambient water quality criteria (WQC) for select metals. Revisions to criteria reflect updates based on current science and many are National Recommended Water Quality Criteria (NRWQC) at Section 304(a) of the Clean Water Act (CWA). This rulemaking is being conducted to evaluate the need to update or revise these criteria in order to remain consistent with state and federal laws and to ensure that Indiana's WQC for metals continue to reflect the best available science and support sound water quality management policies to improve and protect the water resources of the state. Based on the latest scientific knowledge, updated aquatic life and human health ambient WQC for these metals may become more or less stringent than current criteria. IDEM seeks comment on the affected citations listed and any other provisions of Title 327 that may be affected by this rulemaking.

HISTORY

First Notice of Comment Period: March 5, 2014, Indiana Register (DIN: 20140305-IR-327140058FNA).

CITATIONS AFFECTED: 327 IAC 2-1-6; 327 IAC 2-1.5-8.

AUTHORITY: IC 13-14-8-2; IC 13-14-8-3; IC 13-18-4-3.

SUBJECT MATTER AND BASIC PURPOSE OF RULEMAKING

Basic Purpose and Background

The CWA requires the states to periodically review and update their water quality standards (WQS) as appropriate. This rulemaking proposes updates to Indiana's WQS. Many of the proposed revisions to these metal criteria reflect updates to NRWQC at Section 304(a) of the CWA. The criteria to be revised are located in 327 IAC 2-1-6 for waters not within the Great Lakes System and 327 IAC 2-1.5-8 for waters within the Great Lakes System.

Indiana has delegation from the federal government to conduct the state's water quality programs, including the National Pollutant Discharge Elimination System (NPDES) program, that establishes wastewater discharge permit limitations based on the established water quality criteria. WQC form the basis for the maximum allowable concentrations of chemical pollutants and are used as the regulatory targets for permitting, compliance, enforcement, monitoring, assessing state water quality, and the development of Total Maximum Daily Loads (TMDLs). This rulemaking will update both acute and chronic criteria for select metals to reflect current science. For details on the proposed update and impact, please refer to the IDEM website at: http://in.gov/idem/cleanwater/2329.htm under the "Active Projects" heading for a document of tables containing the proposed revisions.

IDEM seeks comment on the affected citations listed, including suggestions for specific language, any other provisions of Title 327 that may be affected by this rulemaking, and alternative ways to achieve the purpose of the rulemaking.

IC 13-14-9-4 Identification of Restrictions and Requirements Not Imposed under Federal Law

No element of the draft rule imposes either a restriction or a requirement on persons to whom the draft rule applies that is not imposed under federal law.

Potential Fiscal Impact

The proposed revisions to the metals criteria are based on current science and many are nationally recommended at Section 304(a) of the CWA. If the state does not revise the metals criteria, the United States Environmental Protection Agency (U.S. EPA) could impose its own standard in place of the state's rules or object to NPDES permits with limits not based on updated criteria. This rulemaking to revise metals criteria has no potential fiscal impact beyond federal requirements.

Public Participation and Work Group Information

At this time, no work group is planned for the rulemaking. If you feel that a work group or other informal discussion on the rule is appropriate, please contact MaryAnn Stevens, Rules Development Branch, Office of Legal Counsel at (317) 232-8635 or (800) 451-6027 (in Indiana).

SUMMARY/RESPONSE TO COMMENTS FROM THE FIRST COMMENT PERIOD

IDEM requested public comment from March 5, 2014, through April 4, 2014, on alternative ways to achieve the purpose of the rule and suggestions for the development of draft rule language. IDEM received no comments in response to the First Notice of Comment Period.

REQUEST FOR PUBLIC COMMENTS

This notice requests the submission of comments on the draft rule language, including suggestions for specific revisions to language to be contained in the draft rule. Comments may be submitted in one of the following ways:

(1) By mail or common carrier to the following address:

LSA Document #14-58 Metals Criteria Revisions

MaryAnn Stevens

Rules Development Branch

Office of Legal Counsel

Indiana Department of Environmental Management

Indiana Government Center North

100 North Senate Avenue

Indianapolis, IN 46204-2251

(2) By facsimile to (317) 233-5970. Please confirm the timely receipt of faxed comments by calling the Rules Development Branch at (317) 232-8922.

(3) By electronic mail to mstevens@idem.in.gov. To confirm timely delivery of submitted comments, please request a document receipt when sending the electronic mail. PLEASE NOTE: Electronic mail comments will NOT be considered part of the official written comment period unless they are sent to the address indicated in this notice.

(4) Hand delivered to the receptionist on duty at the thirteenth floor reception desk, Office of Legal Counsel, Indiana Government Center North, 100 North Senate Avenue, Indianapolis, Indiana.

Regardless of the delivery method used, to properly identify each comment with the rulemaking action it is intended to address, each comment document must clearly specify the LSA document number of the rulemaking.

COMMENT PERIOD DEADLINE

All comments must be postmarked, faxed, or time stamped not later than January 2, 2018. Hand-delivered comments must be delivered to the appropriate office by 4:45 p.m. on the above-listed deadline date.

Additional information regarding this action may be obtained from MaryAnn Stevens, Rules Development Branch, Office of Legal Counsel, (317) 232-8635 or (800) 451-6027 (in Indiana) or Eileen Hack, Technical Environmental Specialist, Office of Water Quality, (317) 234-7914 or (800) 451-6027 (in Indiana).

DRAFT RULE

SECTION 1. 327 IAC 2-1-6 IS AMENDED TO READ AS FOLLOWS:

327 IAC 2-1-6 Minimum surface water quality standards

Authority: IC 13-14-8-2; IC 13-14-8-3; IC 13-18-4-3

Affected: IC 13-11-2-258; IC 13-18-4; IC 13-30-2-1; IC 14-22-9

Sec. 6. (a) The following are minimum surface water quality conditions:

(1) All surface waters, ~~at all times and at all places,~~ including waters within ~~the~~ a mixing zone, ~~shall meet the minimum conditions of being~~ must be free from substances, materials, floating debris, oil, or scum attributable to municipal, industrial, agricultural, and other land use practices, or other discharges that do any of the following:

(A) ~~Will~~ Settle to form putrescent or otherwise objectionable deposits.

(B) ~~Are~~ Occur in amounts sufficient to be unsightly or deleterious.

(i) color;

(ii) visible oil sheen;

(iii) odor; or

(iv) other conditions;

~~in such degree as~~ to ~~create~~ an extent that creates a nuisance.

(D) ~~Are~~ Occur in concentrations or combinations that will cause or contribute to the growth of aquatic plants or algae to ~~such~~ a degree as to:

(i) create a nuisance;

(ii) be unsightly; or

(iii) otherwise impair the designated uses of the surface waters.

(E) ~~Are~~ Occur in amounts sufficient to be acutely toxic to, or to otherwise severely injure or kill, aquatic life, other animals, plants, or humans. To ~~assure~~ ensure protection of aquatic life, concentrations of toxic substances ~~shall~~ must not exceed the final acute value (FAV = 2 (AAC)) in the undiluted discharge or the acute aquatic criterion (AAC) outside the zone of initial dilution or, if applicable, the zone of discharge-induced mixing. The following apply where applicable:

(i) For certain substances, an AAC is ~~established and set forth~~ specified in:

(AA) subdivision (3), Table 6-1;

(BB) subdivision (3), Table 6-2, which ~~table~~ incorporates subdivision (4), Table 6-3; and

(CC) subdivision (5).

(ii) ~~for substances for which an AAC is not specified in subdivision (3), Table 6-1, subdivision (3), Table 6-2, or subdivision (5),~~ An AAC ~~can~~ may be calculated by the commissioner using the procedures in section 8.2 of this rule ~~and~~ for substances for which an AAC is not specified in:

(AA) subdivision (3), Table 6-1;

(BB) subdivision (3), Table 6-2; or

(CC) subdivision (5).

(iii) The AAC determined under item (i) or (ii) may be modified on a site-specific basis to reflect local conditions in accordance with section 8.9 of this rule. ~~This~~

(F) Clause ~~shall~~ (E) does not apply to the chemical control of plants and animals when that control is performed in compliance with approval conditions specified by the Indiana department of natural resources as provided by IC 14-22-9.

(2) At All ~~times, all~~ surface waters outside of mixing zones ~~shall~~ must be free of substances in concentrations that, on the basis of available scientific data, are believed to be sufficient to injure, be chronically toxic to, or be carcinogenic, mutagenic, or teratogenic to humans, animals, aquatic life, or plants. ~~To assure protection against the adverse effects identified in this subdivision,~~ The ~~following~~ requirements to ensure protection against the adverse effects identified in this subdivision are ~~established:~~ as follows:

(A) A toxic substance or pollutant ~~shall~~ must not be present in ~~such~~ surface waters outside of mixing zones in concentrations that exceed the most stringent of the following continuous criterion concentrations (CCCs):

(i) A chronic aquatic criterion (CAC) to protect aquatic life from chronic toxic effects.

(ii) A terrestrial life cycle safe concentration (TLSC) to protect terrestrial organisms from toxic effects that may result from the consumption of aquatic organisms or water from the waterbody.

(iii) A human life cycle safe concentration (HLSC) to protect human health from toxic effects that may result from the consumption of aquatic organisms or drinking water from the waterbody.

(iv) For carcinogenic substances, a criterion to protect human health from unacceptable cancer risk of greater than one (1) additional occurrence of cancer per one hundred thousand (100,000) population.

(B) For certain substances, one (1) or more of the CCCs identified in clause (A) are ~~established and set forth~~ specified in:

(i) subdivision (3), Table 6-1;

(ii) subdivision (3), Table 6-2, which ~~table~~ incorporates subdivision (4), Table 6-3;

(iii) subdivision (3), Table 6-2a; and

(iv) subdivision (5).

(C) ~~For substances for which one (1) or more of the CCCs identified in clause (A) are not specified in subdivision (3), Table 6-1, subdivision (3), Table 6-2, or subdivision (5), such~~ Criterion or criteria may be calculated by the commissioner using the corresponding procedures prescribed by sections 8.3 through 8.6 of this rule for substances for which one (1) or more of the CCCs identified in clause (A) are not specified in:

(i) subdivision (3), Table 6-1;

(ii) subdivision (3), Table 6-2;

(iii) subdivision (3), Table 6-2a; or

(iv) subdivision (5).

(D) A CCC determined under clause (B) or (C) may be modified on a site-specific basis to reflect local conditions in accordance with section 8.9 of this rule.

(E) The CAC and TLSC for a substance apply in all surface waters outside of a mixing zone for a discharge of that substance. ~~Similarly,~~

(F) In surface waters where a public water system intake is not present or is unaffected by the discharge of a substance, the HLSC and the carcinogenic criterion for that substance based on consumption of organisms from the waterbody and only incidental ingestion of water ~~shall~~ apply to all surface waters outside of the mixing zone for a discharge of that substance.

(G) In surface waters where a public water system intake is present, the HLSC and the carcinogenic criterion for a substance based on consumption of organisms and potable water from the waterbody ~~shall~~ apply at the point of the public water system intake.

(3) ~~The following establishes~~ Surface water quality criteria for specific substances are as follows:


Table 6-1
Surface Water Quality Criteria for Specific Substances
AAC (Maximum)		CCC
Substances		Outside of Mixing Zone		Point of Water Intake
Substances		Aquatic Life (CAC) (4-Day Average)	Human Health (30-Day Average)	Human Health (30-Day Average)
Metals (μg/l)
(Total recoverable)
Aluminum	#	#
Antimony			~~45,000~~ 640 (T)	~~146~~ 5.6 (T)
Arsenic ~~(III)~~	#	#	~~0.175 (C)~~	~~0.022 (C)~~
Barium				1,000 (D)
~~Beryllium~~			~~1.17 (C)~~	~~0.068 (C)~~
Cadmium	#	#		~~10 (D)~~
Chromium (III)	#	#	~~3,433,000 (T)~~	~~170,000 (T)~~
Chromium (VI)	#	#		~~50 (D)~~
Copper	#	#		1,300(D)
Lead	#	#		~~50 (D)~~
Mercury$	2.4	0.012	0.15 (T)	0.14 (T)
Nickel	#	#	~~100~~ 4,600 (T)	~~13.4~~ 610 (T)
Selenium	130*	35 ##	4,200 (T)	~~10 (D)~~ 170 (T)
Silver	#			~~50 (D)~~
Thallium			48 (T)	13 (T)
Zinc	#	#	26,000 (T)	7,400(T)
Organics (μg/l)
Acrolein			780 (T)	320 (T)
Acrylonitrile			6.5 (C)	0.58 (C)
Aldrin$	1.5*		0.00079 (C)	0.00074 (C)
Benzene			400 (C)	6.6 (C)
Benzidine			0.0053 (C)	0.0012 (C)
Carbon Tetrachloride			69.4 (C)	4.0 (C)
Chlordane$	1.2*	0.0043	0.0048 (C)	0.0046 (C)
Chlorinated Benzenes
Monochlorobenzene				488 (T)
1,2,4,5-Tetrachlorobenzene $			48 (T)	38 (T)
Pentachlorobenzene $			85 (T)	74 (T)
Hexachlorbenzene$			0.0074 (C)	0.0072 (C)
Chlorinated Ethanes
1,2-dichloroethane			2,430 (C)	9.4 (C)
1,1,1-trichloroethane			1,030,000 (T)	18,400 (T)
1,1,2-trichloroethane			418 (C)	6.0 (C)
1,1,2,2-tetrachloroethane			107 (C)	1.7 (C)
Hexachloroethane			87.4 (C)	19 (C)
Chlorinated Phenols
2,4,5-trichlorophenol				2,600 (T)
2,4,6-trichlorophenol			36 (C)	12 (C)
Chloroalkyl Ethers
bis(2-chloroisopropyl) ether			4,360 (T)	34.7 (T)
bis(chloromethyl) ether			0.018 (C)	0.000038 (C)
bis(2-chloroethyl) ether			13.6 (C)	0.3 (C)
Chloroform			157 (C)	1.9 (C)
Chlorpyrifos	0.083	0.041
DDT$	0.55*	0.0010	0.00024 (C)	0.00024 (C)
Dichlorobenzenes			2,600 (T)	400 (T)
Dichlorobenzidine			0.2 (C)	0.1 (C)
1,1-dichloroethylene			18.5 (C)	0.33 (C)
2,4-dichlorophenol				3,090 (T)
Dichloropropenes			14,100 (T)	87 (T)
Dieldrin$	1.3*	0.0019	0.00076 (C)	0.00071 (C)
2,4-dinitrotoluene			91 (C)	1.1 (C)
Dioxin (2,3,7,8-TCDD)$			0.0000001 (C)	0.0000001 (C)
1,2-diphenylhydrazine			5.6 (C)	0.422 (C)
Endosulfan	0.11*	0.056	159 (T)	74 (T)
Endrin$	0.09*	0.0023		1.0 (D)
Ethylbenzene			3,280 (T)	1,400 (T)
Fluoranthene			54 (T)	42 (T)
Halomethanes			157 (C)	1.9 (C)
Heptachlor$	0.26*	0.0038	0.0028 (C)	0.0028 (C)
Hexachlorobutadiene$			500 (C)	4.47 (C)
Hexachlorocyclohexane (HCH)
alpha HCH$			0.31 (C)	0.09 (C)
beta HCH$			0.55 (C)	0.16 (C)
gamma HCH (Lindane)$	1.0*	0.080	0.63 (C)	0.19 (C)
Technical HCH$			0.41 (C)	0.12 (C)
Hexachlorocyclopentadiene				206 (T)
Isophorone			520,000 (T)	5,200 (T)
Nitrobenzene				19,800 (T)
Nitrophenols
4,6-dinitro-o-cresol			765 (T)	13.4 (T)
Dinitrophenol			14,300 (T)	70 (T)
Nitrosamines
N-nitrosodiethylamine			12.4 (C)	0.008 (C)
N-nitrosodimethylamine			160 (C)	0.014 (C)
N-nitrosodibutylamine			5.9 (C)	0.064 (C)
N-nitrosodiphenylamine			161 (C)	49 (C)
N-nitrosopyrrolidine			919 (C)	0.16 (C)
Parathion	0.065	0.013
Pentachlorophenol	e^{(1.005 [pH]-4.830)}	e^{(1.005 [pH]-5.290)}		1,000 (T)
Phenol				3,500 (T)
Phthalate Esters
Dimethyl phthalate			2,900,000 (T)	313,000 (T)
Diethyl phthalate			1,800,000 (T)	350,000 (T)
Dibutyl phthalate			154,000 (T)	34,000 (T)
Di-2-ethylhexyl phthalate			50,000 (T)	15,000 (T)
Polychlorinated Biphenyls (PCBs)$		0.014	0.00079 (C)	0.00079 (C)
Carcinogenic Polynuclear Aromatic Hydrocarbons (PAHs)			0.31 (C)	0.028 (C)
Tetrachloroethylene			88.5 (C)	8 (C)
Toluene			424,000 (T)	14,300 (T)
Toxaphene$	0.73	0.0002	0.0073 (C)	0.0071 (C)
Trichloroethylene			807 (C)	27 (C)
Vinyl Chloride			5,246 (C)	20 (C)
Other Substances
Asbestos (fibers/liter)				300,000 (C)
Chloride (mg/l)	**	**
Chlorine
(Total Residual) (μg/l)	19	11
Chlorine^a (mg/l)
(intermittent, total residual)		0.2
Cyanide (Free) (μg/l)	22	5.2
Cyanide (Total) (μg/l)				200 (D)
~~Nitrate-N + Nitrite-N (mg/l)~~				~~10 (D)~~
~~Nitrite-N (mg/l)~~				~~1.0 (D)~~
Fluoride ~~shall~~ must not exceed two (2.0) mg/l in all surface waters outside of ~~the~~ a mixing zone except the Ohio River and Interstate Wabash River where it ~~shall~~ must not exceed one (1.0) mg/l outside of ~~the~~ a mixing zone.
Sulfate ~~shall~~ must not exceed the criteria ~~established~~ specified in subdivision (6) in all surface waters outside of ~~the~~ a mixing zone.

#The AAC and CAC for this substance are ~~established~~ specified in Table 6-2.

## Selenium CAC are specified in Table 6-2a.

*One-half (1/2) of the final acute value (FAV) as calculated by procedures developed by U.S. EPA in 1980. This value would correspond to acute aquatic values calculated using ~~IDEM~~ procedures of the department or U.S. EPA procedures developed in 1985 in which the calculated FAV is divided by two (2) to reduce acute toxicity.

**The AAC and CAC for this substance are ~~established~~ specified in subdivision (5).

T derived from threshold toxicity.

C derived from nonthreshold cancer risk.

D derived from drinking water standards, equal to or less than threshold toxicity.

$This substance is a bioaccumulative chemical of concern.

^aTo be considered an intermittent discharge, total residual chlorine ~~shall~~ must not be detected in the discharge for a period of more than forty (40) minutes in duration, and ~~such~~ the periods ~~shall~~ must be separated by at least five (5) hours.


Table 6-2
Surface Water Quality Criteria for ~~Specific Substances~~ Select Metals^[1]
Substances	AAC (Maximum) (μg/l)	AAC Conversion Factors	CAC (4-Day Average) (μg/l)	CAC Conversion Factors
~~Metals (dissolved)^[1]~~
Aluminum (total recoverable)^[2]	WER^[3](e^{(1.3695 [ln(hardness)]+1.8308)})		WER^[3](e^{(1.3695 [ln(hardness)]+0.9161)})
Arsenic ~~(III)~~ (dissolved)^[4]	WER~~^[2]~~^[3] ~~(360)~~ (340)	1.000	WER~~^[2]~~^[3] ~~(190)~~ (150)	1.000
Cadmium (dissolved)^[4]	WER~~^[2]~~^[3]~~(e^{(1.128 [ln(hardness)]-3.828)})~~ (e^{(0.9789 [ln(hardness)]- 3.866)})	1.136672-[(ln hardness) (0.041838)]	WER~~^[2]~~^[3]~~(e^{(0.7852 [ln(hardness)]-3.490)})~~ (e^{(0.7977 [ln(hardness)]-3.909)})	1.101672-[(ln hardness) (0.041838)]
Chromium (III) (dissolved)^[4]	WER~~^[2]~~^[3]~~(e^{(0.819 [ln(hardness)]+3.688)})~~ (e^{(0.819 [ln(hardness)]+3.7256})	0.316	WER~~^[2]~~^[3]~~(e^{(0.8190 [ln(hardness)]+1.561)})~~ (e^{(0.819 [ln(hardness)]+0.6848)})	0.860
Chromium (VI) (dissolved)^[4]	WER~~^[2]~~^[3](16)	0.982	WER~~^[2]~~^[3](11)	0.962
Copper (dissolved)^[4]	WER~~^[2]~~^[3]~~(e^{(0.9422 [ln(hardness)]-1.464)})~~ (e^{(0.9422 [ln(hardness)]-1.700)})	0.960	WER~~^[2]~~^[3]~~(e^{(0.8545 [ln(hardness)]-1.465)})~~ (e^{(0.8545 [ln(hardness)]-1.702)})	0.960
Lead (dissolved)^[4]	WER~~^[2]~~^[3]~~(e^{(1.273 [ln(hardness)]-1.460)})~~ (e^{(1.273 [ln(hardness)]-1.055)})	1.46203-[(ln hardness) (0.145712)]	WER~~^[2]~~^[3]~~(e^{(1.273 [ln(hardness)]-4.705)})~~ (e^{(1.273 [ln(hardness)]-3.557)})	1.46203-[(ln hardness) (0.145712)]
Nickel (dissolved)^[4]	WER~~^[2]~~^[3]~~(e^{(0.8460 [ln(hardness)]+3.3612)})~~ (e^{(0.846 [ln(hardness)]+2.255)})	0.998	WER~~^[2]~~^[3]~~(e^{(0.8460 [ln(hardness)]+1.1645)})~~ (e^{(0.846 [ln(hardness)]+0.0584)})	0.997
Silver (dissolved)^[4]	WER~~^[2]~~^[3]~~(e^{(1.72 [ln(hardness)]-6.52)}/2^[3])~~ (e^{(1.72 [ln(hardness)]-6.59)})	0.85
Zinc (dissolved)^[4]	WER~~^[2]~~^[3]~~(e^{(0.8473 [ln(hardness)]+0.8604)})~~ (e^{(0.8473 [ln(hardness)]+0.884)})	0.978	WER~~^[2]~~^[3]~~(e^{(0.8473 [ln(hardness)]+0.7614)})~~ (e^{(0.8473 [ln(hardness)]+0.884)})	0.986


^[1] ~~The AAC and CAC columns of~~ With the exception of aluminum, the hardness values used in the equations in this table ~~contain total recoverable metals~~ must be no greater than 400 mg/l calcium carbonate (CaCO₃), and the criteria ~~(numeric and hardness-based). The criterion for the dissolved metal is calculated by multiplying the appropriate conversion factor by the AAC or CAC. This dissolved~~ at a hardness of 400 mg/l CaCO₃are used for water hardnesses above 400 mg/l CaCO₃. For aluminum, the hardness values must be no greater than 220 mg/l CaCO_3, and the criteria at a hardness of 220 mg/l CaCO₃are used for water hardnesses above 220 mg/l CaCO₃.
^[2]Aluminum is expressed as total recoverable metal. The applicable pH range for determining the aluminum criterion is within 6.5 and 9.0. The total AAC or CAC ~~shall~~ must be rounded to two (2) significant digits, except when the criteria are used as intermediate values in a calculation, such as in the calculation of water quality-based effluent limitations (WQBELs).
~~^[2]~~^[3]A value of one (1) ~~shall~~ must be used for the water-effect ratio (WER) unless an alternate value is established under section 8.9 of this rule.
^[3] One-half (1/2) of the FAV as calculated by procedures developed by U.S. EPA in 1980. This value would correspond to acute aquatic values calculated using IDEM procedures or U.S. EPA procedures developed in 1985 in which the calculated FAV is divided by two (2) to reduce acute toxicity.
^[4]Aquatic life criteria for these metals are expressed in terms of dissolved metal in the water column. The AAC and CAC columns of this table contain total recoverable metals criteria (numeric and hardness-based). The criterion for the dissolved metal is calculated by multiplying the appropriate conversion factor by the AAC or CAC. This dissolved AAC or CAC must be rounded to two (2) significant digits, except when the criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.



Table 6-2a
Surface Water Quality Aquatic Life Criteria for Selenium
CAC
Fish Tissue (mg/kg dry weight)			Water Column (μg/L)
Egg or ovary	Whole-body	Muscle (skinless, boneless filet)	Lentic aquatic systems	Lotic aquatic systems	Short term, intermittent lentic and lotic aquatic systems
15.1^[1,2]	8.5^[2,3]	11.3^[2,3]	1.5 (30 day)^[4,5]	3.1 (30 day)^[4,5]	Intermittent exposure equation^[4,5,6,7]

^[1]Egg or ovary supersedes any whole-body, muscle, or water column element when fish egg or ovary concentrations are measured. Duration: Instantaneous measurement.
^[2]Frequency: Not to be exceeded.
^[3]Fish whole-body or muscle tissue supersedes water column element when both fish tissue and water concentrations are measured. Duration: Instantaneous measurement.
^[4]Water column values are based on dissolved total selenium in water (includes all oxidation states, for example, selenite, selenate, organic selenium, and any other forms) and are derived from fish tissue values via bioaccumulation modeling.
^[5]Frequency: Not to be exceeded more than once in three (3) years on average.
^[6]Intermittent Exposure Equation is as follows:
	WQC_30-day– C_bkgrnd(1 – f_int)
	f_int

Where:	WQC_30-dayis the water column monthly element for either lentic or lotic waters;
	C_bkgrndis the average background selenium concentration; and
	f_intis the fraction of any 30-day period during which elevated selenium concentrations occur, with f_int assigned a value > 0.033 (corresponding to one (1) day).
^[7]Duration: Number of days per month with an elevated concentration.

(4) The ~~following establishes dissolved~~ AAC and CAC for certain metals at selected hardness values calculated from the equations and conversion factors in subdivision (3), Table 6-2, and using a value of one (1) for the WER are as follows:

Table 6-3

Metals Concentrations in Micrograms Per Liter; Hardness in Milligrams Per Liter CaCO₃¹

Aluminum (Total)

Arsenic ~~(III)~~ (Dissolved)

Cadmium (Dissolved)

Chromium (III) (Dissolved)

Chromium (VI) (Dissolved)

Copper (Dissolved)

Hardness

AAC

CAC

AAC

CAC

AAC

CAC

AAC

CAC

AAC

CAC

AAC

CAC

1,300

530

~~360~~ 340

~~190~~ 150

~~1.7~~ 0.94

~~0.62~~ 0.43

~~310~~ 320

~~100~~ 42

~~8.9~~ 7.0

~~6.3~~ 5.0

100

3,400

1,400

~~360~~ 340

~~190~~ 150

~~3.7~~ 1.8

~~1.0~~ 0.72

~~550~~ 570

~~180~~ 74

17 13

11 9.0

150

6,000

2,400

~~360~~ 340

~~190~~ 150

~~5.7~~ 2.6

~~1.4~~ 0.97

~~760~~ 790

~~250~~ 100

25 20

16 13

200

8,800

3,500

~~360~~ 340

~~190~~ 150

~~7.8~~ 3.4

~~1.7~~ 1.2

~~970~~ 1,000

~~310~~ 130

33 26

21 16

250

10,000

4,000

~~360~~ 340

~~190~~ 150

10 4.2

~~2.0~~ 1.4

1200

~~380~~ 160

40 32

25 20

300

10,000

4,000

~~360~~ 340

~~190~~ 150

12 5.0

~~2.3~~ 1.6

~~1300~~ 1,400

~~440~~ 180

48 38

29 23

350

10,000

4,000

~~360~~ 340

~~190~~ 150

14 5.8

~~2.6~~ 1.8

~~1500~~ 1,600

~~500~~ 210

55 44

33 26

400

10,000

4,000

~~360~~ 340

~~190~~ 150

17 6.5

~~2.9~~ 2.0

~~1700~~ 1,800

~~550~~ 230

63 50

37 29

~~450~~

~~360~~

~~190~~

~~3.1~~

~~1900~~

~~610~~

~~500~~

~~360~~

~~190~~

~~3.4~~

~~2100~~

~~670~~

Lead (Dissolved)

Nickel (Dissolved)

Silver (Dissolved)

Zinc (Dissolved)

Hardness

AAC

CAC

AAC

CAC

AAC

CAC

AAC

CAC

30 45

~~1.2~~ 3.7

~~790~~ 260

87 29

~~0.52~~ 0.98

64 65

58 66

100

65 97

~~2.5~~ 7.9

~~1400~~ 470

~~160~~ 52

~~1.7~~ 3.2

~~110~~ 120

~~100~~ 120

150

~~100~~ 150

~~3.9~~ 12

~~2000~~ 660

~~220~~ 73

~~3.5~~ 6.5

~~160~~ 170

~~150~~ 170

200

~~140~~ 200

~~5.3~~ 17

~~25000~~ 840

~~280~~ 93

~~5.7~~ 11

210

~~190~~ 210

250

~~170~~ 260

~~6.7~~ 21

~~3100~~ 1,000

~~340~~ 110

~~8.3~~ 16

250

~~230~~ 260

300

~~210~~ 310

~~8.1~~ 26

~~3600~~ 1,200

~~400~~ 130

11 21

~~290~~ 300

~~270~~ 300

350

~~240~~ 370

~~9.5~~ 30

~~4100~~ 1,400

~~450~~ 150

15 28

~~330~~ 340

~~300~~ 340

400

~~280~~ 420

11 34

~~4600~~ 1,500

~~510~~ 170

19 35

~~370~~ 380

~~340~~ 380

~~450~~

~~320~~

~~5100~~

~~560~~

~~410~~

~~370~~

~~500~~

~~350~~

~~5500~~

~~610~~

~~450~~

~~410~~

^[1] The ~~dissolved metals~~ criteria in this table have been rounded to two (2) significant digits in accordance with subdivision (3), Table 6-2. The equations and conversion factors in subdivision (3), Table 6-2 ~~shall~~ must be used instead of the criteria in this table when ~~dissolved metals~~ these criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(5) ~~The following establishes~~ Surface water quality criteria for chloride for protection of aquatic life are as follows:

(A) The ~~following provides the~~ AAC for chloride as a function of hardness (in mg/l as (CaCO₃)) and sulfate (in mg/l) in surface waters is calculated using the following formula:

C = 287.8 (hardness)^0.205797 (sulfate)^-0.07452

Where: C = chloride AAC (maximum) in mg/l.

(B) The ~~following provides the~~ CAC for chloride as a function of hardness (in mg/l as CaCO₃) and sulfate (in mg/l) in surface waters is calculated using the following formula:

C = 177.87 (hardness)^0.205797 (sulfate)^-0.07452

Where: C = chloride CAC (4-day average) in mg/l.

(C) ~~The following~~ This clause applies to the AAC and CAC for chloride provided in this subdivision, as follows:

(i) Chloride criteria may only be established based on a sulfate concentration greater than the water quality criterion for sulfate, as established under subdivision (6), where the water quality criterion for sulfate has been modified on a site-specific basis in accordance with either the:

(AA) variance provisions under section 8.8 of this rule; or ~~the~~

(BB) site-specific criteria provisions under section 8.9 of this rule.

(ii) The AAC and CAC for chloride calculated from the equations in this subdivision ~~shall~~ must be rounded to the nearest whole numbers, except when the criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(D) The ~~following establishes the~~ AAC for chloride in mg/l at selected concentrations of hardness and sulfate with the understanding that the equation in clause (A) shall be used instead of the criteria in this clause when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs: is shown in the following table:



Table 6-3a^[1]
Hardness (mg/l)
Sulfate (mg/l)	50	100	150	200	250	300	350	400	450	500
15	526	607	660	700	733	761	785	807	827	845
20	515	594	646	685	717	745	769	790	809	827
25	506	584	635	674	705	732	756	777	796	813
50	481	555	603	640	670	695	718	738	756	773
100	457	527	573	608	636	660	682	701	718	734
150	443	511	556	589	617	641	661	680	697	712
200	434	500	544	577	604	627	647	665	682	697
250	427	492	535	567	594	617	637	654	671	685
300	421	485	528	560	586	609	628	646	661	676
350	416	480	522	553	579	602	621	638	654	668
400	412	475	516	548	574	596	615	632	647	662
450	408	471	512	543	569	590	609	626	642	656
500	405	467	508	539	564	586	605	622	637	651
^[1]The equation in clause (A) must be used instead of the criteria in this clause when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(E) The ~~following establishes the~~ CAC for chloride in mg/l at selected concentrations of hardness and sulfate with the understanding that the equation in clause (B) shall be used instead of the criteria in this clause when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs: is shown in the following table:



Table 6-3b^[1]
Hardness (mg/l)
Sulfate (mg/l)	50	100	150	200	250	300	350	400	450	500
15	325	375	408	433	453	470	485	499	511	522
20	318	367	399	423	443	460	475	488	500	511
25	313	361	392	416	436	453	467	480	492	503
50	297	343	373	395	414	430	444	456	467	477
100	282	326	354	375	393	408	421	433	444	453
150	274	316	343	364	381	396	409	420	430	440
200	268	309	336	357	373	388	400	411	421	431
250	264	304	331	351	367	381	394	404	414	423
300	260	300	326	346	362	376	388	399	409	418
350	257	297	322	342	358	372	384	394	404	413
400	255	294	319	339	355	368	380	391	400	409
450	252	291	316	336	351	365	377	387	397	405
500	250	289	314	333	349	362	374	384	394	402
^[1] The equation in clause (B) must be used instead of the criteria in this clause when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(6) ~~The following establishes~~ Surface water quality criteria for sulfate that ~~shall~~ must not be exceeded in ~~all~~ any surface ~~waters~~ water outside of ~~the~~ a mixing zone are as follows:

(A) The ~~following provides~~ surface water quality criteria for sulfate in mg/l for the specified ranges of hardness (in mg/l as CaCO₃) or chloride (in mg/l), or both, are as follows:

(i) If the hardness concentration of surface waters is greater than or equal to one hundred (100) mg/l but less than or equal to five hundred (500) mg/l, and if the chloride concentration of surface waters is greater than or equal to five (5) mg/l but less than twenty-five (25) mg/l, then:

C = [-57.478 + 5.79 (hardness) + 54.163 (chloride)] × 0.65

Where: C = sulfate criterion in mg/l.

(ii) If the hardness concentration of surface waters is greater than or equal to one hundred (100) mg/l but less than or equal to five hundred (500) mg/l, and if the chloride concentration of surface waters is greater than or equal to twenty-five (25) mg/l but less than or equal to five hundred (500) mg/l, then:

C = [1276.7 + 5.508 (hardness) - 1.457 (chloride)] × 0.65

Where: C = sulfate criterion in mg/l.

(iii) If the hardness concentration of surface waters is less than one hundred (100) mg/l and the chloride concentration of surface waters is less than or equal to five hundred (500) mg/l, the sulfate criterion is five hundred (500) mg/l.

(iv) If the hardness concentration of surface waters is greater than five hundred (500) mg/l and the chloride concentration of surface waters is greater than or equal to five (5) mg/l, but less than or equal to five hundred (500) mg/l, the sulfate criterion ~~shall be~~ is calculated using a hardness concentration of five hundred (500) mg/l and the equation in item (i) or (ii) that applies to the chloride concentration.

(v) If the chloride concentration of surface waters is less than five (5) mg/l, the sulfate criterion is five hundred (500) mg/l.

(B) ~~The following~~ This clause applies to the surface water quality criteria for sulfate provided in clause (A), as follows:

(i) Sulfate criteria may only be established based on a chloride concentration greater than the CAC for chloride established under subdivision (5) where the CAC for chloride has been modified on a site-specific basis in accordance with either the:

(AA) variance provisions under section 8.8 of this rule; or ~~the~~

(BB) site-specific criteria provisions under section 8.9 of this rule.

(ii) The surface water quality criteria for sulfate calculated from equations in clause (A) ~~shall~~ must be rounded to the nearest whole numbers, except when the criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(C) The ~~following establishes~~ surface water quality criteria for sulfate in mg/l at selected concentrations of hardness and chloride ~~with the understanding that the equations in clause (A) shall be used instead of the criteria in this clause when sulfate criteria~~ are ~~used as intermediate values in a calculation, such as in the calculation of WQBELs:~~ shown in the following table:



Table 6-3c^[1]
Hardness (mg/l)
Chloride (mg/l)	<100	100	150	200	250	300	350	400	450	500	>500
<5	500	500	500	500	500	500	500	500	500	500	500
5	500	515	703	891	1080	1268	1456	1644	1832	2020	2020
10	500	691	879	1067	1256	1444	1632	1820	2008	2196	2196
15	500	867	1055	1243	1432	1620	1808	1996	2184	2372	2372
20	500	1043	1231	1419	1608	1796	1984	2172	2360	2549	2549
25	500	1164	1343	1522	1701	1880	2059	2238	2417	2596	2596
50	500	1141	1320	1499	1678	1857	2036	2215	2394	2573	2573
100	500	1093	1272	1451	1630	1809	1988	2167	2346	2525	2525
150	500	1046	1225	1404	1583	1762	1941	2120	2299	2478	2478
200	500	998	1177	1356	1535	1715	1894	2073	2252	2431	2431
250	500	951	1130	1309	1488	1667	1846	2025	2204	2383	2383
^[1]The equations in clause (A) must be used instead of the criteria in this clause when sulfate criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(b) ~~This subsection establishes minimum surface water quality for aquatic life.~~ In addition to subsection (a), ~~subdivisions (1) through (5) are established to ensure~~ the following minimum conditions ~~necessary for the maintenance of a well-balanced aquatic community The following~~ are applicable ~~at any point~~ in the surface waters outside of ~~the~~ a mixing zone to ensure conditions necessary for the maintenance of a well-balanced aquatic community:

(1) There ~~shall~~ must be no ~~substances~~ substance that:

(A) ~~impart~~ imparts unpalatable flavor to food fish; or

(B) ~~result~~ results in offensive odors in the vicinity of the water.

(2) No pH values below six (6.0) or above nine (9.0) are permitted, except daily fluctuations that:

(A) exceed pH nine (9.0); and

(B) are correlated with photosynthetic activity.

~~shall be permitted.~~

(3) Concentrations of dissolved oxygen ~~shall:~~ must:

(A) average at least five (5.0) milligrams per liter per calendar day; and

(B) not be less than four (4.0) milligrams per liter at any time.

(4) ~~The following are~~ Conditions for temperature are as follows:

(A) ~~There shall be no~~ Abnormal temperature changes that may adversely affect aquatic life are prohibited unless caused by natural conditions.

(B) The normal daily and seasonal temperature fluctuations that existed before the addition of heat due to other than natural causes ~~shall~~ must be maintained.

(i) five (5) degrees Fahrenheit (two and eight-tenths (2.8) degrees Celsius) in streams; and

(ii) three (3) degrees Fahrenheit (one and seven-tenths (1.7) degrees Celsius) in lakes and reservoirs.

(D) Water temperatures ~~shall~~ must not exceed the maximum limits in ~~the following~~ Table 6-4 during more than one percent (1%) of the hours in the twelve (12) month period ending with any month. ~~At no time shall~~ The water temperature at ~~such~~ the locations must not exceed the maximum limits in the following table by more than three (3) degrees Fahrenheit (one and seven-tenths (1.7) degrees Celsius):



Table 6-4
	Ohio River Main Stem °F(°C)	Other Indiana Streams °F(°C)
January	50 (10.0)	50 (10.0)
February	50 (10.0)	50 (10.0)
March	60 (15.6)	60 (15.6)
April	70 (21.1)	70 (21.1)
May	80 (26.7)	80 (26.7)
June	87 (30.6)	90 (32.2)
July	89 (31.7)	90 (32.2)
August	89 (31.7)	90 (32.2)
September	87 (30.7)	90 (32.2)
October	78 (25.6)	78 (25.5)
November	70 (21.1)	70 (21.1)
December	57 (14.0)	57 (14.0)

(5) The following criteria ~~will~~ must be used to regulate ammonia:

(A) Except for waters covered in clause (B), ~~at all times, all~~ surface waters outside of mixing zones ~~shall~~ must be free of substances in concentrations that, on the basis of available scientific data, are believed to be sufficient to ~~(i)~~ injure, ~~(ii)~~ be chronically toxic to, or ~~(iii)~~ be carcinogenic, mutagenic, or teratogenic to:

(i) humans;

(ii) animals;

(iii) aquatic life; or

(iv) plants.

(B) For ~~those~~ waters listed in subsection (c), the following ammonia criteria ~~will~~ apply outside ~~the~~ of a mixing zone:



Table 6-5
Maximum Ammonia Concentrations (Unionized Ammonia as N)^***
(mg/l) Temperature (°C)
pH	0	5	10	15	20	25	30
6.5	0.0075	0.0106	0.0150	0.0211	0.0299	0.0299	0.0299
6.6	0.0092	0.0130	0.0183	0.0259	0.0365	0.0365	0.0365
6.7	0.0112	0.0158	0.0223	0.0315	0.0444	0.0444	0.0444
6.8	0.0135	0.0190	0.0269	0.0380	0.0536	0.0536	0.0536
6.9	0.0161	0.0228	0.0322	0.0454	0.0642	0.0642	0.0642
7.0	0.0191	0.0270	0.0381	0.0539	0.0761	0.0761	0.0761
7.1	0.0244	0.0316	0.0447	0.0631	0.0892	0.0892	0.0892
7.2	0.0260	0.0367	0.0518	0.0732	0.1034	0.1034	0.1034
7.3	0.0297	0.0420	0.0593	0.0837	0.1183	0.1183	0.1183
7.4	0.0336	0.0474	0.0669	0.0946	0.1336	0.1336	0.1336
7.5	0.0374	0.0528	0.0746	0.1054	0.1489	0.1489	0.1489
7.6	0.0411	0.0581	0.0821	0.1160	0.1638	0.1638	0.1638
7.7	0.0447	0.0631	0.0892	0.1260	0.1780	0.1780	0.1780
7.8	0.0480	0.0678	0.0958	0.1353	0.1911	0.1911	0.1911
7.9	0.0510	0.0720	0.1017	0.1437	0.2030	0.2030	0.2030
8.0	0.0536	0.0758	0.1070	0.1512	0.2135	0.2135	0.2135
8.1	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
8.2	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
8.3	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
8.4	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
8.5	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
8.6	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
8.7	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
8.8	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
8.9	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
9.0	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
^*To calculate total ammonia, divide the number in ~~the~~ Table 6-5** by the value determined by: 1/(10^{pK a -pH} + 1).


Where:	pK_a	=	0.09018 + (2729.92/(T + 273.2))
	pH	=	pH of water
	T	=	°C



Table 6-6
24-Hour Average Ammonia Concentrations (Unionized Ammonia as N)^***
(mg/l) Temperature (°C)
pH	0	5	10	15	20	25	30
6.5	0.0005	0.0008	0.0011	0.0015	0.0015	0.0015	0.0015
6.6	0.0007	0.0010	0.0014	0.0019	0.0019	0.0019	0.0019
6.7	0.0009	0.0012	0.0017	0.0024	0.0024	0.0024	0.0024
6.8	0.0011	0.0015	0.0022	0.0031	0.0031	0.0031	0.0031
6.9	0.0014	0.0019	0.0027	0.0038	0.0038	0.0038	0.0038
7.0	0.0017	0.0024	0.0034	0.0048	0.0048	0.0048	0.0048
7.1	0.0022	0.0031	0.0043	0.0061	0.0061	0.0061	0.0061
7.2	0.0027	0.0038	0.0054	0.0077	0.0077	0.0077	0.0077
7.3	0.0034	0.0048	0.0068	0.0097	0.0097	0.0097	0.0097
7.4	0.0043	0.0061	0.0086	0.0122	0.0122	0.0122	0.0122
7.5	0.0054	0.0077	0.0108	0.0153	0.0153	0.0153	0.0153
7.6	0.0068	0.0097	0.0136	0.0193	0.0193	0.0193	0.0193
7.7	0.0086	0.0122	0.0172	0.0242	0.0242	0.0242	0.0242
7.8	0.0092	0.0130	0.0184	0.0260	0.0260	0.0260	0.0260
7.9	0.0098	0.0138	0.0196	0.0276	0.0276	0.0276	0.0276
8.0	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
8.1	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
8.2	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
8.3	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
8.4	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
8.5	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
8.6	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
8.7	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
8.8	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
8.9	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
9.0	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
^*To calculate total ammonia, divide the number in ~~the~~ Table 6-6** by the value determined by: 1/(10^{pK a -pH} + 1).


Where:	pK_a	=	0.09018 + (2729.92/(T + 273.2))
	pH	=	pH of water
	T	=	°C

(c) ~~This subsection establishes surface water quality~~ Waters designated by the Indiana department of natural resources for put-and-take trout fishing are designated as salmonid waters and must be protected for cold-water fish. In addition to subsections (a) and (b), the following criteria are ~~established to ensure conditions necessary for the maintenance of a well-balanced, cold-water fish community and are~~ applicable ~~at any point~~ in the surface waters outside of ~~the~~ a mixing zone to ensure conditions necessary for the maintenance of a well-balanced, cold-water fish community:

~~(1) Waters:~~

~~(A) designated as salmonid waters; and~~

~~(B) that shall be protected for cold-water fish;~~

~~are those waters designated by the Indiana department of natural resources for put-and-take trout fishing.~~

~~(2) In the waters listed in subdivision (1),~~

(1) Dissolved oxygen concentrations ~~shall~~ must not be less than:

(A) six (6.0) milligrams per liter at any time; and

(B) seven (7.0) milligrams per liter in areas where spawning occurs during the spawning season and in areas used for imprinting during the time salmonids are being imprinted.

~~(3) In those waters listed in subdivision (1),~~ (2) The maximum temperature rise above natural ~~shall~~ must not exceed two (2) degrees Fahrenheit (one and one-tenth (1.1) degrees Celsius) at any time or place and, unless due to natural causes, the temperature ~~shall~~ must not exceed the following:

(A) Seventy (70) degrees Fahrenheit (twenty-one and one-tenth (21.1) degrees Celsius) at any time.

(B) Sixty-five (65) degrees Fahrenheit (eighteen and three-tenths (18.3) degrees Celsius) during spawning and imprinting periods.

(d) ~~This subsection establishes~~ Bacteriological quality for recreational uses during the recreational season is as follows:

(1) The recreational season is defined as the months of April through October, inclusive.

(2) In addition to subsection (a), the criteria in this subsection are to be used to do the following:

(A) Evaluate waters for full body contact recreational uses.

(B) Establish wastewater treatment requirements.

(3) For full body contact recreational uses, E. coli bacteria ~~shall~~ must not exceed the following:

(A) One hundred twenty-five (125) colony forming units (cfu) or most probable number (MPN) per one hundred (100) milliliters as a geometric mean based on not less than five (5) samples equally spaced over a thirty (30) day period.

(B) Two hundred thirty-five (235) cfu or MPN per one hundred (100) milliliters in any one (1) sample in a thirty (30) day period, except that, in cases where there are at least ten (10) samples at a given site, up to ten percent (10%) of the samples may exceed two hundred thirty-five (235) cfu or MPN per one hundred (100) milliliters where the:

(i) E. coli exceedances are incidental and attributable solely to E. coli resulting from the discharge of treated wastewater from a wastewater treatment plant as defined at IC 13-11-2-258; and

(ii) criterion in clause (A) is met.

However, a single sample ~~shall be~~ is used for making beach notification and closure decisions.

If a geometric mean cannot be calculated because five (5) equally spaced samples are not available, then the criterion stated in clause (B) must be met.

(4) For demonstrating compliance with wastewater treatment requirements, sanitary wastewater dischargers shall ensure the following:

(A) The concentration of E. coli in the undiluted discharge does not exceed one hundred twenty-five (125) cfu or MPN per one hundred (100) milliliters as a geometric mean of the effluent samples taken in a calendar month.

(B) Not more than ten percent (10%) of all samples when not less than ten (10) samples are taken and analyzed for E. coli in a calendar month exceed two hundred thirty-five (235) cfu or MPN per one hundred (100) milliliters as a daily maximum. Under this clause, the calculation of ten percent (10%) of the samples taken ~~shall~~ must be limited to the lowest whole number result.

(5) Effluent limits to implement the criteria in subdivision (3) during the recreational season ~~shall~~ must be established in NPDES permits by incorporating the following that are to be applied to the undiluted discharge:

(A) The concentration of E. coli in the undiluted discharge ~~shall~~ must not exceed one hundred twenty-five (125) cfu or MPN per one hundred (100) milliliters as a geometric mean of the effluent samples taken in a calendar month.

(B) Not more than ten percent (10%) of all samples in a calendar month exceed two hundred thirty-five (235) cfu or MPN per one hundred (100) milliliters as a daily maximum. Under this clause, the calculation of ten percent (10%) of the samples taken ~~shall~~ must be limited to the lowest whole number result.

(e) ~~This subsection establishes surface water quality for public water supply.~~ In addition to subsections (a) and (d), the ~~following~~ criteria ~~are established~~ to protect the surface water quality at the point at which water is withdrawn for treatment for public water supply are as follows:

(1) The coliform bacteria group ~~shall~~ must not exceed the following:

(A) Five thousand (5,000) cfu or MPN per one hundred (100) milliliters as a monthly average value (either MPN or membrane filter (MF) count).

(B) Five thousand (5,000) cfu or MPN per one hundred (100) milliliters in more than twenty percent (20%) of the samples examined during any month.

(C) Twenty thousand (20,000) cfu or MPN per one hundred (100) milliliters in more than five percent (5%) of the samples examined during any month.

(2) Taste and odor producing substances, other than naturally occurring, ~~shall~~ must not interfere with the production of a finished water by conventional treatment consisting of the following:

(A) Coagulation.

(B) Sedimentation.

(D) Disinfection.

(3) The concentrations of either chloride or sulfate ~~shall~~ must not exceed two hundred fifty (250) milligrams per liter unless due to naturally occurring sources.

(4) The concentration of dissolved solids ~~shall~~ must not exceed seven hundred fifty (750) milligrams per liter unless due to naturally occurring sources. A specific conductance of one thousand two hundred (1,200) micromhos per centimeter (at twenty-five (25) degrees Celsius) may be considered equivalent to a dissolved solids concentration of seven hundred fifty (750) milligrams per liter.

(5) Surface waters ~~shall be considered~~ are acceptable for public water supply if radium-226 and strontium-90 are present in amounts not exceeding three (3) and ten (10) picocuries per liter, respectively. In the known absence of strontium-90 and alpha emitters, the water supply is acceptable when the gross beta concentrations do not exceed one thousand (1,000) picocuries per liter.

(6) The:

(A) combined concentration of nitrate-N and nitrite-N must not exceed ten (10) milligrams per liter; and

(B) concentration of nitrite-N must not exceed one (1) milligram per liter.

~~(6)~~ (7) Chemical constituents in the waters ~~shall~~ must not be present ~~in such~~ at levels ~~as to~~ that prevent, after conventional treatment, meeting the drinking water standards contained in 327 IAC 8-2, due to other than natural causes.

(f) ~~This subsection establishes surface water quality for industrial water supply.~~ In addition to subsection (a), the criterion to ensure protection of water quality at the point at which water is withdrawn for use (either with or without treatment) for industrial cooling and processing is that, other than from naturally occurring sources, the dissolved solids ~~shall~~ must not exceed seven hundred fifty (750) milligrams per liter at any time other than from naturally occurring sources to ensure protection of water quality at the point at which surface water is withdrawn for use, either with or without treatment, for industrial cooling and processing. A specific conductance of one thousand two hundred (1,200) micromhos per centimeter (at twenty-five (25) degrees Celsius) may be considered equivalent to a dissolved solids concentration of seven hundred fifty (750) milligrams per liter.

(g) ~~This subsection establishes surface water quality for agricultural uses.~~ The criteria to ensure surface water quality conditions necessary for agricultural use are the same as those in subsection (a).

(h) ~~This subsection establishes surface water quality for limited uses.~~ The quality of surface waters ~~classified~~ designated for limited uses under section ~~3(a)(5)~~ 11(a) of this rule ~~shall,~~ must, at a minimum, meet the ~~following~~ criteria ~~(1) The criteria~~ contained in ~~subsection~~ subsections (a), ~~(2) The criteria contained in subsection~~ (d), ~~(3) The criteria contained in subsection (f),~~ and where applicable, ~~(4) The waters must~~ subsection (f), and be aerobic at all times. ~~(5) Notwithstanding subdivisions (1) through (4), the quality of a limited use stream~~ However, the water must meet the criteria that are applicable to the higher use water at the point where it a limited use water:

(1) becomes physically or chemically capable of supporting a higher use; or ~~at its interface~~

(2) interfaces with a higher use water segment. ~~shall meet the criteria that are applicable to the higher use water.~~

(Water Pollution Control Division; 327 IAC 2-1-6; filed Sep 24, 1987, 3:00 p.m.: 11 IR 581; filed Feb 1, 1990, 4:30 p.m.: 13 IR 1020; errata, 13 IR 1861; errata filed Jul 6, 1990, 5:00 p.m.: 13 IR 2003; filed Feb 26, 1993, 5:00 p.m.: 16 IR 1725; errata filed May 7, 1993, 4:00 p.m.: 16 IR 2189; filed Jan 14, 1997, 12:00 p.m.: 20 IR 1348; errata filed Aug 11, 1997, 4:15 p.m.: 20 IR 3376; filed Feb 14, 2005, 10:05 a.m.: 28 IR 2047; errata filed Apr 6, 2006, 2:48 p.m.: 29 IR 2546; errata, 29 IR 3027; filed Mar 18, 2008, 2:26 p.m.: 20080416-IR-327060573FRA; filed May 22, 2008, 10:40 a.m.: 20080618-IR-327070185FRA; filed Jul 9, 2012, 2:54 p.m.: 20120808-IR-327110320FRA; filed Nov 10, 2014, 1:51 p.m.: 20141210-IR-327130290FRA)

SECTION 2. 327 IAC 2-1.5-8 IS AMENDED TO READ AS FOLLOWS:

327 IAC 2-1.5-8 Minimum surface water quality criteria

Authority: IC 13-14-8-2; IC 13-14-8-3; IC 13-18-4-3

Affected: IC 13-11-2-258; IC 13-18-4; IC 13-30-2-1; IC 14-22-9

Sec. 8. (a) All surface water quality criteria in this section, except those provided in subsection (b)(1), ~~will cease to be~~ are not applicable when the stream flows are less than the applicable stream design flow for the particular criterion as determined under 327 IAC 5-2-11.4.

(b) The following are minimum surface water quality conditions:

(1) All surface waters within the Great Lakes system, ~~at all times, and at all places,~~ including waters within ~~the~~ a mixing zone, ~~shall meet the minimum conditions of being~~ must be free from substances, materials, floating debris, oil, or scum attributable to municipal, industrial, agricultural, and other land use practices, or other discharges that do any of the following:

(A) ~~Will~~ Settle to form putrescent or otherwise objectionable deposits.

(B) ~~Are~~ Occur in amounts sufficient to be unsightly or deleterious.

(i) color;

(ii) visible oil sheen;

(iii) odor; or

(iv) other conditions;

~~in such degree as~~ to ~~create~~ an extent that creates a nuisance.

(D) ~~Are~~ Occur in concentrations or combinations that will cause or contribute to the growth of aquatic plants or algae to ~~such~~ a degree as to:

(i) create a nuisance;

(ii) be unsightly; or

(iii) otherwise impair the designated uses of the surface waters.

(i) Concentrations of toxic substances ~~shall~~ must not exceed the CMC or SMC outside the zone of initial dilution or the final acute value (FAV = 2 (CMC) or 2 (SMC)) in the undiluted discharge unless, for a discharge to a receiving stream or Lake Michigan, an alternate mixing zone demonstration is conducted and approved in accordance with 327 IAC 5-2-11.4(b)(4), in which case, the CMC or SMC ~~shall~~ must be met outside the applicable alternate mixing zone. The following apply where applicable:

(AA) For certain substances, a CMC is ~~established and set forth~~ specified in:

(aa) subdivision (3), Table 8-1, which ~~table~~ incorporates subdivision (4), Table 8-2; and

(bb) subdivision (5).

(BB) For substances for which a CMC is not specified in subdivision (3), Table 8-1, or subdivision (5):

(aa) a CMC ~~shall~~ must be calculated by the commissioner using the procedures in section 11 of this rule; or

(bb) if the minimum data requirements to calculate a CMC are not met, an SMC ~~shall~~ must be calculated using the procedures in section 12 of this rule. ~~and~~

(CC) The CMC or SMC determined under subitem (AA) or (BB) may be modified on a site-specific basis to reflect local conditions in accordance with section 16 of this rule.

(ii) A discharge ~~shall~~ must not cause acute toxicity, as measured by whole effluent toxicity tests, at any point in the waterbody. Compliance with this criterion ~~shall be~~ is demonstrated if a discharge does not exceed one and zero-tenths (1.0) TU_a in the undiluted discharge. For a discharge into a receiving stream or Lake Michigan, for which an alternate mixing zone demonstration is conducted and approved in accordance with 327 IAC 5-2-11.4(b)(4), compliance with this criterion ~~shall be~~ is demonstrated if three-tenths (0.3) TU_a is not exceeded outside the applicable alternate mixing zone. ~~This~~

(2) At All ~~times, all~~ surface waters outside of the applicable mixing zones determined in accordance with section 7 of this rule ~~shall~~ must be free of substances in concentrations that, on the basis of available scientific data, are believed to be sufficient to injure, be chronically toxic to, or be carcinogenic, mutagenic, or teratogenic to humans, animals, aquatic life, or plants. To ~~assure~~ ensure protection against the adverse effects identified in this subdivision, a toxic substance or pollutant ~~shall~~ must not be present in ~~such~~ surface waters outside of the applicable mixing zones determined in accordance with section 7 of this rule in concentrations that exceed the most stringent of the following:

(A) A CCC or an SCC to protect aquatic life from chronic toxic effects as follows:

(i) For certain substances, a CCC is ~~established and set forth~~ specified in:

(AA) subdivision (3), Table 8-1, which ~~table~~ incorporates subdivision (4), Table 8-2;

(BB) subdivision (3), Table 8-1a; and

(CC) subdivision (5).

(ii) For substances for which a CCC is not specified in subdivision (3), Table 8-1 or Table 8-1a, or subdivision (5):

(AA) a CCC ~~shall~~ must be calculated by the commissioner using the procedures in section 11 of this rule; or

(BB) if the minimum data requirements to calculate a CCC are not met, an SCC ~~shall~~ must be calculated using the procedures in section 12 of this rule.

(iii) The CCC or SCC determined under item (i) or (ii) may be modified on a site-specific basis to reflect local conditions in accordance with section 16 of this rule.

(iv) To ~~assure~~ ensure protection of aquatic life, a discharge ~~shall~~ must not cause chronic toxicity, as measured by whole effluent toxicity tests, outside of the applicable mixing zone. Compliance with this criterion ~~shall be~~ is demonstrated if the waterbody does not exceed one and zero-tenths (1.0) TU_c at the edge of the mixing zone.

(B) An HNC or HNV to protect human health from adverse noncancer effects that may result from the consumption of aquatic organisms or drinking water from the waterbody determined as follows:

(i) For certain substances, an HNC is ~~established and set forth~~ specified in subdivision (6), Table 8-3.

(ii) For substances for which an HNC is not specified in subdivision (6), Table 8-3:

(AA) an HNC ~~shall~~ must be calculated by the commissioner using the procedures in section 14 of this rule; or

(BB) if the minimum data requirements to calculate an HNC are not met, an HNV ~~shall~~ must be calculated using the procedures in section 14 of this rule.

(iii) The HNC or HNV determined under item (i) or (ii) may be modified on a site-specific basis to reflect local conditions in accordance with section 16 of this rule.

(iv) The HNC for nondrinking water or HNV for nondrinking water for a substance ~~shall apply~~ applies to all surface waters outside the applicable mixing zone for a discharge of that substance. The HNC for drinking water or HNV for drinking ~~shall apply~~ water for a substance applies at the point of the public water system intake.

(C) For carcinogenic substances, an HCC or HCV to protect human health from unacceptable cancer risk of greater than one (1) additional occurrence of cancer per one hundred thousand (100,000) population as follows:

(i) For certain substances, an HCC is ~~established and set forth~~ specified in subdivision (6), Table 8-3.

(ii) For substances for which an HCC is not specified in subdivision (6), Table 8-3:

(AA) an HCC ~~shall~~ must be calculated by the commissioner using the procedures in section 14 of this rule; or

(BB) if the minimum data requirements to calculate an HCC are not met, an HCV ~~shall~~ must be calculated using the procedures in section 14 of this rule.

(iii) The HCC or HCV determined under item (i) or (ii) may be modified on a site-specific basis to reflect local conditions in accordance with section 16 of this rule.

(iv) The HCC for nondrinking water or HCV for nondrinking water for a substance ~~shall apply~~ applies to all surface waters outside the applicable mixing zone for a discharge of that substance. The HCC for drinking water or HCV for drinking ~~shall apply~~ water applies at the point of the public water system intake.

(D) A WC to protect avian and mammalian wildlife populations from adverse effects that may result from the consumption of aquatic organisms or water from the waterbody as follows:

(i) For certain substances, a WC is ~~established and set forth~~ specified in subdivision (7), Table 8-4.

(ii) For substances for which a WC is not specified in subdivision (7), Table 8-4:

(AA) a WC ~~shall~~ must be calculated by the commissioner using the procedures in section 15 of this rule; or

(BB) if the minimum data requirements to calculate a WC are not met, a WV may be calculated using the procedures in section 15 of this rule.

(iii) The WC or WV determined under item (i) or (ii) may be modified on a site-specific basis to reflect local conditions in accordance with section 16 of this rule.

(3) ~~The following establishes~~ Surface water quality criteria for protection of aquatic life are as follows:



Table 8-1
Surface Water Quality Criteria for Protection of Aquatic Life^[1]^[2]
CAS Number	Substances		CMC (Maximum) (μg/l)	CMC Conversion Factors	CCC (4-Day Average) (μg/l)	CCC Conversion Factors
	Metals ~~(dissolved)^[2]~~
7429905		Aluminum (total recoverable^[3]	WER^[4](e^{(1.3695 [ln(hardness)]+1.8308)})		WER^[4](e^{(1.3695 [ln(hardness)]+0.9161)})
7440382		Arsenic ~~(III)~~ (dissolved)^[5]	WER~~^[3]~~^[4]~~(339.8)~~ (340)	1.000	WER~~^[3]~~^[4] ~~(147.9)~~ (150)	1.000
7440439		Cadmium (dissolved)^[5]	WER~~^[3]~~^[4]~~(e^{(1.128 [ln(hardness)]-3.6867)})~~ (e^{(0.9789 [ln(hardness)]-3.866)})	1.136672-[(ln hardness) (0.041838)]	WER~~^[3]~~^[4]~~(e^{(0.7852 [ln(hardness)]-2.715)})~~ (e^{(0.7977 [ln(hardness)]-3.909)})	1.101672-[(ln hardness) (0.041838)]
7440473		Chromium (III) (dissolved)^[5]	WER~~^[3]~~^[4](e^{(0.819 [ln(hardness)]+3.7256)})	0.316	WER~~^[3]~~^[4](e^{(0.819 [ln(hardness)]+0.6848)})	0.860
7440473		Chromium (VI) (dissolved)^[5]	WER~~^[3]~~^[4]~~(16.02)~~ (16)	0.982	WER~~^[3]~~^[4]~~(10.98)~~ (11)	0.962
7440508		Copper (dissolved)^[5]	WER~~^[3]~~^[4](e^{(0.9422 [ln(hardness)]-1.700)})	0.960	WER~~^[3]~~^[4](e^{(0.8545 [ln(hardness)]-1.702)})	0.960
7439921		Lead (dissolved)^[5]	WER^[4](e^{(1.273 [ln(hardness)]-1.055)})	1.46203-[(ln hardness) (0.145712)]	WER^[4](e^{(1.273 [ln(hardness)]-3.557)})	1.46203-[(ln hardness) (0.145712)]
7439976		Mercury (dissolved)^[5]	WER~~^[3]~~^[4](1.694)	0.85	WER~~^[3]~~^[4] (0.9081)	0.85
7440020		Nickel (dissolved)^[5]	WER~~^[3]~~^[4](e^{(0.846 [ln(hardness)]+2.255)})	0.998	WER~~^[3]~~^[4](e^{(0.846 [ln(hardness)]+0.0584)})	0.997
7782492		Selenium (dissolved)			5 Table 8-1a	~~0.922~~
7440666		Zinc (dissolved)^[5]	WER~~^[3]~~^[4](e^{(0.8473 [ln(hardness)]+0.884)})	0.978	WER~~^[3]~~^[4](e^{(0.8473 [ln(hardness)]+0.884)})	0.986
	Organics (total)
60571		Dieldrin	0.24	NA	0.056	NA
72208		Endrin	0.086	NA	0.036	NA
56382		Parathion	0.065	NA	0.013	NA
87865		Pentachlorophenol~~^[4]~~^[6]	e^{(1.005[pH]-4.869)}	NA	e^{(1.005[pH]-5.134)}	NA
	Other Substances
		Chloride	~~^[6]~~^[7]	NA	~~^[6]~~^[7]	NA
		Chlorine (total residual)	19	NA	11	NA
		Chlorine (intermittent, total residual)~~^[5]~~^[8]	200	NA		NA
57125		Cyanide (free)	22	NA	5.2	NA
^[1] Aquatic organisms should not be affected unacceptably if the four (4) day average concentration of any substance in this table does not exceed the CCC more than once every three (3) years on the average and if the one (1) hour average concentration does not exceed the CMC more than once every three (3) years on the average, except possibly where a commercially or recreationally important species is very sensitive.
^[2]With the exception of aluminum, the hardness values used in the equations in this table must be no greater than 400 mg/l calcium carbonate (CaCO₃), and the criteria at a hardness of 400 mg/l CaCO₃are used for water hardnesses above 400 mg/l CaCO₃. For aluminum, the hardness values must be no greater than 220 mg/l CaCO₃, and the criteria at a hardness of 220 mg/l CaCO₃are used for water hardnesses above 220 mg/l CaCO₃.
^[2] The CMC and CCC columns of this table contain total recoverable metals criteria (numeric and hardness-based). The criterion for the dissolved metal is calculated by multiplying the appropriate conversion factor by the CMC or CCC. This dissolved
^[3]Aluminum is expressed as total recoverable metal. The applicable pH range for determining the aluminum criterion is within 6.5 and 9.0. The total CMC or CCC ~~shall~~ must be rounded to two (2) significant digits, except when the criteria are used as intermediate values in a calculation, such as in the calculation of water quality-based effluent limitations (WQBELs).
~~^[3]~~^[4]A value of one (1) ~~shall~~ must be used for the WER unless an alternate value is established under section 16 of this rule.
^[5] Aquatic life criteria for these metals are expressed in terms of dissolved metal in the water column. The CMC and CCC columns of this table contain total recoverable metals criteria (numeric and hardness-based). The criterion for the dissolved metal is calculated by multiplying the appropriate conversion factor by the CMC or CCC. This dissolved CMC or CCC must be rounded to two (2) significant digits, except when the criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.
~~^[4]~~^[6] A CMC and CCC calculated for pentachlorophenol using the equation in this table ~~shall~~ must be rounded to two (2) significant digits, except when the criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.
^[5] To be considered an intermittent discharge, total residual chlorine shall not be detected in the discharge for a period of more than forty (40) minutes in duration, and such periods shall be separated by at least five (5) hours.
~~^[6]~~^[7]The CMC and CCC for this substance are ~~established~~ specified in subdivision (5).
^[8] To be considered an intermittent discharge, total residual chlorine must not be detected in the discharge for a period of more than forty (40) minutes in duration, and the periods must be separated by at least five (5) hours.




Table 8-1a
CCC
Fish Tissue (mg/kg dry weight)			Water Column (μg/L)
Egg or ovary	Whole-body	Muscle (skinless, boneless filet)	Lentic aquatic systems	Lotic aquatic systems	Short term, intermittent lentic and lotic aquatic systems
15.1^[1,2]	8.5^[2,3]	11.3^[2,3]	1.5 (30 day)^[4,5]	3.1 (30 day)^[4,5]	Intermittent exposure equation^[4,5,6,7]

^[1]Egg or ovary supersedes any whole-body, muscle, or water column element when fish egg or ovary concentrations are measured. Duration: Instantaneous measurement.
^[2]Frequency: Not to be exceeded.
^[3]Fish whole-body or muscle tissue supersedes water column element when both fish tissue and water concentrations are measured. Duration: Instantaneous measurement.
^[4]Water column values are based on dissolved total selenium in water (includes all oxidation states, for example, selenite, selenate, organic selenium, and any other forms) and are derived from fish tissue values via bioaccumulation modeling.
^[5]Frequency: Not to be exceeded more than once in three (3) years on average.
^[6]Intermittent Exposure Equation is as follows:
	WQC_30-day– C_bkgrnd(1 – f_int)
	f_int
Where:	WQC_30-dayis the water column monthly element for either lentic or lotic waters;
	C_bkgrndis the average background selenium concentration; and
	f_intis the fraction of any 30-day period during which elevated selenium concentrations occur, with f_int assigned a value > 0.033 (corresponding to one (1) day).
^[7]Duration: Number of days per month with an elevated concentration.

(4) ~~The following establishes dissolved~~ The CMCs and CCCs for certain metals at selected hardness values calculated from the equations and conversion factors in subdivision (3), Table 8-1 and using a value of one (1) for the WER, where applicable, are as follows:



Table 8-2
Metals Concentrations in Micrograms Per Liter; Hardness in Milligrams Per Liter CaCO₃^[1]
	Aluminum (Total)		Arsenic ~~(III)~~ (Dissolved)		Cadmium (Dissolved)		Chromium (III) (Dissolved)		Chromium (VI) (Dissolved)		Copper (Dissolved)
Hardness	CMC	CCC	CMC	CCC	CMC	CCC	CMC	CCC	CMC	CCC	CMC	CCC
50	1,300	530	340	150	~~2.0~~ 0.94	~~1.3~~ 0.43	320	42	16	11	7.0	5.0
100	3,400	1,400	340	150	~~4.3~~ 1.8	~~2.2~~ 0.72	570	74	16	11	13	9.0
150	6,000	2,400	340	150	~~6.6~~ 2.6	~~3.0~~ 0.97	790	100	16	11	20	13
200	8,800	3,500	340	150	~~9.0~~ 3.4	~~3.7~~ 1.2	1,000	130	16	11	26	16
250	10,000	4,000	340	150	12 4.2	~~4.4~~ 1.4	1,200	160	16	11	32	20
300	10,000	4,000	340	150	14 5.0	~~5.0~~ 1.6	1,400	180	16	11	38	23
350	10,000	4,000	340	150	17 5.8	~~5.6~~ 1.8	1,600	210	16	11	44	26
400	10,000	4,000	340	150	19 6.5	~~6.2~~ 2.0	1,800	230	16	11	50	29
~~450~~			~~340~~	~~150~~	22	~~6.8~~	~~2,000~~	~~250~~	16	11	55	32
~~500~~			~~340~~	~~150~~	24	~~7.3~~	~~2,100~~	~~280~~	16	11	61	35

	Lead (Dissolved)		Mercury (Dissolved)		Nickel (Dissolved)		~~Selenium~~		Zinc (Dissolved)
Hardness	CMC	CCC	CMC	CCC	CMC	CCC	~~CMC~~	~~CCC~~	CMC	CCC
50	45	3.7	1.4	0.77	260	29	–	~~4.6~~	65	66
100	97	7.9	1.4	0.77	470	52	–	~~4.6~~	120	120
150	150	12	1.4	0.77	660	73	–	~~4.6~~	170	170
200	200	17	1.4	0.77	840	93	–	~~4.6~~	210	210
250	260	21	1.4	0.77	1,000	110	–	~~4.6~~	250	260
300	310	26	1.4	0.77	1,200	130	–	~~4.6~~	300	300
350	370	30	1.4	0.77	1,400	150	–	~~4.6~~	340	340
400	420	34	1.4	0.77	1,500	170	–	~~4.6~~	380	380
~~450~~			~~1.4~~	~~0.77~~	~~1,700~~	~~190~~	–	~~4.6~~	~~420~~	~~420~~
~~500~~			~~1.4~~	~~0.77~~	~~1,800~~	~~200~~	–	~~4.6~~	~~460~~	~~460~~
^[1] The ~~dissolved metals~~ criteria in this table have been rounded to two (2) significant digits in accordance with subdivision (3), Table 8-1. The equations and conversion factors in subdivision (3), Table 8-1 ~~shall~~ must be used instead of the criteria in this table when ~~dissolved metals~~ these criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(5) ~~The following establishes~~ Surface water quality criteria for chloride for protection of aquatic life are as follows:

(A) The ~~following provides the~~ CMC for chloride as a function of hardness (in mg/l as CaCO₃) and sulfate (in mg/l) in surface waters is calculated using the following formula:

C = 287.8 (hardness)^0.205797 (sulfate)^-0.07452

Where: C = chloride CMC (maximum) in mg/l.

(B) The ~~following provides the~~ CCC for chloride as a function of hardness (in mg/l as CaCO₃) and sulfate (in mg/l) in surface waters is calculated using the following formula:

C = 177.87 (hardness)^0.205797 (sulfate)^-0.07452

Where: C = chloride CCC (4-Day Average) in mg/l.

(C) The CMC and CCC for chloride calculated from the equations in this subdivision ~~shall~~ must be rounded to the nearest whole numbers, except when the criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(D) The ~~following establishes the~~ CMC for chloride in mg/l at selected concentrations of hardness and sulfate with the understanding that the equation in clause (A) shall be used instead of the criteria in this clause when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs: is shown in the following table:



Table 8-2a^[1]
Hardness (mg/l)
Sulfate (mg/l)	50	100	150	200	250	300	350	400	450	500
15	526	607	660	700	733	761	785	807	827	845
20	515	594	646	685	717	745	769	790	809	827
25	506	584	635	674	705	732	756	777	796	813
50	481	555	603	640	670	695	718	738	756	773
100	457	527	573	608	636	660	682	701	718	734
150	443	511	556	589	617	641	661	680	697	712
200	434	500	544	577	604	627	647	665	682	697
250	427	492	535	567	594	617	637	654	671	685
300	421	485	528	560	586	609	628	646	661	676
350	416	480	522	553	579	602	621	638	654	668
400	412	475	516	548	574	596	615	632	647	662
450	408	471	512	543	569	590	609	626	642	656
500	405	467	508	539	564	586	605	622	637	651
^[1] The equation in clause (A) must be used instead of the criteria in this clause when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(E) The ~~following establishes the~~ CCC for chloride in mg/l at selected concentrations of hardness and sulfate with the understanding that the equation in clause (B) shall be used instead of the criteria in this clause when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs: is shown in the following table:



Table 8-2b ^[1]
Hardness (mg/l)
Sulfate (mg/l)	50	100	150	200	250	300	350	400	450	500
15	325	375	408	433	453	470	485	499	511	522
20	318	367	399	423	443	460	475	488	500	511
25	313	361	392	416	436	453	467	480	492	503
50	297	343	373	395	414	430	444	456	467	477
100	282	326	354	375	393	408	421	433	444	453
150	274	316	343	364	381	396	409	420	430	440
200	268	309	336	357	373	388	400	411	421	431
250	264	304	331	351	367	381	394	404	414	423
300	260	300	326	346	362	376	388	399	409	418
350	257	297	322	342	358	372	384	394	404	413
400	255	294	319	339	355	368	380	391	400	409
450	252	291	316	336	351	365	377	387	397	405
500	250	289	314	333	349	362	374	384	394	402
^[1] The equation in clause (B) must be used instead of the criteria in this clause when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(6) ~~The following establishes~~ Surface water quality criteria for protection of human health are as follows:



Table 8-3
Surface Water Quality Criteria for Protection of Human Health^[1]
			Human Noncancer Criteria (HNC)		Human Cancer Criteria (HCC)
CAS Number	Substances		Drinking Water (μg/l)	Nondrinking Water (μg/l)	Drinking Water (μg/l)	Nondrinking Water (μg/l)
	Metals (total recoverable)
7439976		Mercury (including methylmercury)	0.0018	0.0018
	Organics (total)
71432		Benzene	19	510	12	310
57749		Chlordane	0.0014	0.0014	0.00025	0.00025
108907		Chlorobenzene	470	3,200
50293		DDT	0.002	0.002	0.00015	0.00015
60571		Dieldrin	0.00041	0.00041	6.5 × 10^-6	6.5 × 10^-6
105679		2,4-dimethylphenol	450	8,700
51285		2,4-dinitrophenol	55	2,800
118741		Hexachlorobenzene	0.046	0.046	0.00045	0.00045
67721		Hexachloroethane	6	7.6	5.3	6.7
58899		Lindane	0.47	0.5
75092		Methylene chloride	1,600	90,000	47	2600
1336363		PCBs (class)			6.8 × 10^-6	6.8 × 10^-6
1746016		2,3,7,8-TCDD (dioxin)	6.7 × 10^-8	6.7 × 10^-8	8.6 × 10^-9	8.6 × 10^-9
108883		Toluene	5,600	51,000
8001352		Toxaphene			6.8 × 10^-5	6.8 × 10^-5
79016		Trichloroethylene			29	370
	Other Substances
57125		Cyanide (total)	600	48,000
^[1]The HNC and HCC are thirty (30) day average criteria.

(7) ~~The following establishes~~ Surface water quality criteria for protection of wildlife are as follows:



Table 8-4
Surface Water Quality Criteria for Protection of Wildlife^[1]
CAS Number	Substances		Wildlife Criteria (μg/l)
	Metals (total recoverable)
7439976		Mercury (including methylmercury)	0.0013
	Organics (total)
50293		DDT and metabolites	1.1 × 10^-5
1336363		PCBs (class)	1.2 × 10^-4
1746016		2, 3, 7, 8-TCDD (dioxin)	3.1 × 10^-9
^[1]The WC are thirty (30) day average criteria.

(c) ~~This subsection establishes minimum surface water quality criteria for aquatic life.~~ In addition to ~~the criteria in~~ subsection (b), ~~this subsection ensures~~ the following minimum conditions ~~necessary for the maintenance of a well-balanced aquatic community. The following conditions~~ are applicable ~~at any point~~ in the surface waters outside of the applicable mixing zone, as determined in accordance with section 7 of this rule, to ensure conditions necessary for the maintenance of a well-balanced aquatic community:

(1) There ~~shall~~ must be no ~~substances~~ substance that:

(A) ~~impart~~ imparts unpalatable flavor to food fish; or

(B) ~~result~~ results in offensive odors in the vicinity of the water.

(2) No pH values below six (6.0) or above nine (9.0) are permitted except daily fluctuations that:

(A) exceed pH nine (9.0); and

(B) are correlated with photosynthetic activity.

~~shall be permitted.~~

(3) Concentrations of dissolved oxygen ~~shall:~~ must:

(A) average at least five (5.0) milligrams per liter per calendar day; and

(B) not be less than four (4.0) milligrams per liter at any time.

(4) ~~The following are~~ Conditions for temperature are as follows:

(A) ~~There shall be no~~ Abnormal temperature changes that may adversely affect aquatic life are prohibited unless caused by natural conditions.

(B) The normal daily and seasonal temperature fluctuations that existed before the addition of heat due to other than natural causes ~~shall~~ must be maintained.

(C) Water temperatures ~~shall~~ must not exceed the maximum limits in ~~the following~~ Table 8-5 during more than one percent (1%) of the hours in the twelve (12) month period ending with any month. ~~At no time shall~~ The water temperature at ~~such~~ the locations must not exceed the maximum limits in the following table by more than three (3) degrees Fahrenheit (one and seven-tenths (1.7) degrees Celsius):



Table 8-5
Maximum Instream Water Temperatures
Month	St. Joseph River Tributary to Lake Michigan Upstream of the Twin Branch Dam °F(°C)	All Other Indiana Streams in the Great Lakes System °F(°C)
January	50 (10)	50 (10)
February	50 (10)	50 (10)
March	55 (12.8)	60 (15.6)
April	65 (18.3)	70 (21.1)
May	75 (23.9)	80 (26.7)
June	85 (29.4)	90 (32.2)
July	85 (29.4)	90 (32.2)
August	85 (29.4)	90 (32.2)
September	84 (29.4)	90 (32.2)
October	70 (21.1)	78 (25.5)
November	60 (15.6)	70 (21.1)
December	50 (10)	57 (14.0)

(D) The following temperature criteria ~~shall~~ apply to Lake Michigan:

(i) In all receiving waters, the points of measurement normally ~~shall~~ must be in the first meter below the surface at ~~such~~ depths necessary to avoid thin layer surface warming due to extreme ambient air temperatures, but, where required to determine the true distribution of heated wastes and natural variations in water temperatures, measurements ~~shall~~ must be at a greater depth and at several depths as a thermal profile.

(ii) ~~There shall be no~~ Abnormal temperature changes ~~so as to be~~ injurious to fish, wildlife, or other aquatic life, or the growth or propagation thereof are prohibited. In addition, plume interaction with the bottom ~~shall:~~ must:

(AA) be minimized; and

(BB) not injuriously affect fish, shellfish, and wildlife spawning or nursery areas.

(iii) The normal daily and seasonal temperature fluctuations that existed before the addition of heat ~~shall~~ must be maintained.

(iv) At any time and at a maximum distance of a one thousand (1,000) foot arc inscribed from a fixed point adjacent to the discharge or as agreed upon by the commissioner and federal regulatory agencies, the following ~~shall~~ apply:

(AA) The receiving water temperature ~~shall~~ must not be more than three (3) degrees Fahrenheit (one and seven-tenths (1.7) degrees Celsius) above the existing natural water temperature.

(BB) Thermal discharges to Lake Michigan ~~shall~~ must comply with the following maximum temperature requirements:

(aa) Thermal discharges to Lake Michigan ~~shall~~ must not raise the maximum temperature in the receiving water above those listed in the following table, except to the extent the permittee adequately demonstrates that the exceedance is caused by the water temperature of the intake water:



Table 8-6
Maximum Water Temperatures
Month	°F(°C)
January	45 (7)
February	45 (7)
March	45 (7)
April	55 (13)
May	60 (16)
June	70 (21)
July	80 (27)
August	80 (27)
September	80 (27)
October	65 (18)
November	60 (16)
December	50 (10)

(bb) If the permittee demonstrates that the intake water temperature is within three (3) degrees Fahrenheit below an applicable maximum temperature under subitem (aa), Table 8-6, then not more than a three (3) degree Fahrenheit exceedance of the maximum water temperature ~~shall be~~ is permitted.

(v) The following facilities ~~described as follows~~ that discharge into the open waters of Lake Michigan ~~shall be~~ are limited to the amount essential for blowdown in the operation of a closed cycle cooling facility:

(AA) All facilities that have new waste heat discharges exceeding a daily average of five-tenths (0.5) billion British thermal units per hour. As used in this item, "new waste heat discharge" means a any discharge that had not begun operations as of February 11, 1972.

(BB) All facilities with existing waste heat discharges that increase the quantity of waste heat discharged by more than a daily average of five-tenths (0.5) billion British thermal units per hour.

(vi) Water intakes ~~shall~~ must be designed and located to minimize entrainment and damage to desirable organisms. Requirements may vary depending upon local conditions, but, in general, intakes ~~shall:~~ must:

(AA) have minimum water velocity; and

(BB) not be located in spawning or nursery areas of important fishes.

Water velocity at screens and other exclusion devices ~~shall also~~ must be at a minimum.

(vii) Discharges other than those ~~now~~ in existence ~~shall be such that the~~ on or before February 11, 1972, must not have thermal plumes ~~do not~~ that overlap or intersect.

(viii) Facilities discharging more than a daily average of five-tenths (0.5) billion British thermal units of waste heat ~~shall:~~ must:

(AA) continuously record intake and discharge temperature and flow; and

(BB) make those records available to the public or regulatory agencies upon request.

(5) The following criteria ~~shall~~ must be used to regulate ammonia:

(A) Concentrations of total ammonia (as N) ~~shall~~ must not exceed the CMC outside the zone of initial dilution or the final acute value (FAV = 2 (CMC)) in the undiluted discharge unless, for a discharge to a receiving stream or Lake Michigan, an alternate mixing zone demonstration is conducted and approved in accordance with 327 IAC 5-2-11.4(b)(4), in which case, the CMC ~~shall~~ must be met outside the applicable alternate mixing zone. The CMC of total ammonia (as N) is determined using the following equation:



Where:	FT	=	10^0.03(20-T)
	FPH	=	1; when: 8 < pH < 9; or
			1 + 10^{(7.4 - pH)}	; when: 6.5 < pH < 8
			1.25	; when: 6.5 < pH < 8
	pK_a	=	0.09018 +	2729
	pK_a	=	0.09018 +	T + 273.2
	T	=	Temperature in °C

(B) The CCC of total ammonia (as N) is determined using the following equation:



Where:	FT	=	10^0.03(20-T)
	FPH	=	1; when: 8 < pH < 9; or
			1 + 10^{(7.4 - pH)}	; when: 6.5 < pH < 8
			1.25	; when: 6.5 < pH < 8
	RATIO	=	13.5; when: 7.7 < pH < 9; or
			(20)(10^{(7.7 - pH)})	; when: 6.5 < pH < 7.7
			1 + 10^{(7.4 - pH)}	; when: 6.5 < pH < 7.7
	pK_a	=	0.09018 +	2729
	pK_a	=	0.09018 +	T + 273.2
	T	=	Temperature in °C

(C) The use of the equations in clause (A) results in the following CMCs for total ammonia (as N) at different temperatures and pHs:



Table 8-7
Criterion Maximum Concentrations for Total Ammonia (as N) Temperature (°C)
pH	0	5	10	15	20	25	30
6.5	28.48	26.61	25.23	24.26	23.64	23.32	23.29
6.6	27.68	25.87	24.53	23.59	22.98	22.68	22.65
6.7	26.74	24.99	23.69	22.78	22.20	21.92	21.90
6.8	25.64	23.96	22.72	21.85	21.30	21.03	21.01
6.9	24.37	22.78	21.60	20.78	20.26	20.01	20.00
7.0	22.95	21.45	20.35	19.58	19.09	18.86	18.86
7.1	21.38	19.98	18.96	18.24	17.80	17.59	17.60
7.2	19.68	18.40	17.46	16.81	16.40	16.22	16.24
7.3	17.90	16.73	15.88	15.29	14.93	14.78	14.81
7.4	16.06	15.02	14.26	13.74	13.42	13.30	13.35
7.5	14.23	13.31	12.64	12.19	11.92	11.81	11.88
7.6	12.44	11.65	11.07	10.67	10.45	10.37	10.45
7.7	10.75	10.06	9.569	9.238	9.052	9.003	9.088
7.8	9.177	8.597	8.181	7.907	7.760	7.734	7.830
7.9	7.753	7.268	6.924	6.701	6.589	6.584	6.689
8.0	6.496	6.095	5.813	5.636	5.555	5.569	5.683
8.1	5.171	4.857	4.639	4.508	4.457	4.486	4.602
8.2	4.119	3.873	3.707	3.612	3.584	3.625	3.743
8.3	3.283	3.092	2.967	2.900	2.891	2.942	3.061
8.4	2.618	2.472	2.379	2.335	2.340	2.399	2.519
8.5	2.091	1.979	1.911	1.886	1.903	1.968	2.089
8.6	1.672	1.588	1.540	1.529	1.555	1.625	1.747
8.7	1.339	1.277	1.246	1.246	1.279	1.353	1.475
8.8	1.075	1.030	1.011	1.021	1.060	1.137	1.260
8.9	0.8647	0.8336	0.8254	0.8418	0.8862	0.9650	1.088
9.0	0.6979	0.6777	0.6777	0.6998	0.7479	0.8286	0.9521

(D) The use of the equations in clause (B) results in the following CCCs for total ammonia (as N) at different temperatures and pHs:



Table 8-8
Criterion Continuous Concentrations for Total Ammonia (as N) Temperature (°C)
pH	0	5	10	15	20	25	30
6.5	2.473	2.310	2.191	2.106	2.052	2.025	2.022
6.6	2.473	2.311	2.191	2.107	2.053	2.026	2.023
6.7	2.473	2.311	2.191	2.107	2.054	2.027	2.025
6.8	2.473	2.311	2.192	2.108	2.055	2.028	2.027
6.9	2.474	2.312	2.193	2.109	2.056	2.030	2.030
7.0	2.474	2.312	2.193	2.110	2.058	2.033	2.033
7.1	2.475	2.313	2.195	2.112	2.060	2.036	2.037
7.2	2.475	2.314	2.196	2.114	2.063	2.040	2.043
7.3	2.476	2.315	2.198	2.116	2.066	2.044	2.050
7.4	2.477	2.317	2.200	2.119	2.070	2.050	2.058
7.5	2.478	2.319	2.202	2.123	2.075	2.058	2.069
7.6	2.480	2.321	2.206	2.128	2.082	2.067	2.082
7.7	2.450	2.294	2.181	2.106	2.063	2.052	2.071
7.8	2.092	1.959	1.865	1.802	1.769	1.763	1.785
7.9	1.767	1.657	1.578	1.527	1.502	1.501	1.525
8.0	1.481	1.389	1.325	1.285	1.266	1.269	1.295
8.1	1.179	1.107	1.057	1.027	1.016	1.022	1.049
8.2	0.9387	0.8828	0.8450	0.8232	0.8169	0.8263	0.8531
8.3	0.7481	0.7048	0.6762	0.6610	0.6589	0.6705	0.6976
8.4	0.5968	0.5634	0.5421	0.5321	0.5334	0.5468	0.5741
8.5	0.4766	0.4511	0.4357	0.4298	0.4337	0.4485	0.4760
8.6	0.3811	0.3619	0.3511	0.3485	0.3545	0.3704	0.3981
8.7	0.3052	0.2910	0.2839	0.2839	0.2916	0.3083	0.3362
8.8	0.2450	0.2347	0.2305	0.2326	0.2417	0.2591	0.2871
8.9	0.1971	0.1900	0.1881	0.1919	0.2020	0.2199	0.2480
9.0	0.1591	0.1545	0.1545	0.1595	0.1705	0.1889	0.2170

(d) ~~This subsection establishes surface water quality for cold-water fish.~~ The waters listed in section 5(a)(3) of this rule are designated as salmonid waters and ~~shall~~ must be protected for cold-water fish. In addition to subsections (b) and (c), the following criteria are ~~established to ensure conditions necessary for the maintenance of a well-balanced, cold-water fish community and are~~ applicable ~~at any point~~ in the surface waters outside of the applicable mixing zone, as determined in accordance with section 7 of this rule, to ensure conditions necessary for the maintenance of a well-balanced, cold-water fish community:

(1) Dissolved oxygen concentrations ~~shall~~ must not be less than:

(A) six (6.0) milligrams per liter at any time; and

(B) seven (7.0) milligrams per liter in areas where spawning occurs during the spawning season and in areas used for imprinting during the time salmonids are being imprinted.

Dissolved oxygen concentrations in the open waters of Lake Michigan ~~shall~~ must not be less than seven (7.0) milligrams per liter at any time.

(2) The maximum temperature rise above natural ~~shall~~ must not exceed two (2) degrees Fahrenheit (one and one-tenth (1.1) degrees Celsius) at any time or place and, unless due to natural causes, the temperature ~~shall~~ must not exceed the following:

(A) Seventy (70) degrees Fahrenheit (twenty-one and one-tenth (21.1) degrees Celsius) at any time.

(B) Sixty-five (65) degrees Fahrenheit (eighteen and three-tenths (18.3) degrees Celsius) during spawning or imprinting periods.

(e) ~~This subsection establishes~~ Bacteriological quality for recreational uses during the recreational season is as follows:

(1) The recreational season is defined as the months of April through October, inclusive.

(2) In addition to subsection (b), the criteria in this subsection ~~shall~~ are to be used to do the following:

(A) Evaluate waters for full body contact recreational uses.

(B) Establish wastewater treatment requirements.

(3) For full body contact recreational uses, E. coli bacteria ~~shall~~ must not exceed the following:

(i) ~~the~~ E. coli exceedances are incidental and attributable solely to E. coli resulting from the discharge of treated wastewater from a wastewater treatment plant as defined at IC 13-11-2-258; and

(ii) ~~the~~ criterion in clause (A) is met.

However, a single sample ~~shall be~~ is used for making beach notification and closure decisions.

If a geometric mean cannot be calculated because five (5) equally spaced samples are not available, then the criterion stated in clause (B) must be met.

(4) For demonstrating compliance with wastewater treatment requirements, sanitary wastewater dischargers shall ensure the following:

(f) ~~This subsection establishes surface water quality for public water supply.~~ In addition to subsection (b), the ~~following~~ criteria ~~are established~~ to protect the surface water quality at the point at which water is withdrawn for treatment for public water supply are as follows:

(1) The coliform bacteria group ~~shall~~ must not exceed the following:

(A) Five thousand (5,000) cfu or MPN per one hundred (100) milliliters as a monthly average value (either MPN or membrane filter (MF) count).

(B) Five thousand (5,000) cfu or MPN per one hundred (100) milliliters in more than twenty percent (20%) of the samples examined during any month.

(C) Twenty thousand (20,000) cfu or MPN per one hundred (100) milliliters in more than five percent (5%) of the samples examined during any month.

(2) Taste and odor producing substances, other than those naturally occurring, ~~shall~~ must not interfere with the production of a finished water by conventional treatment consisting of the following:

(A) Coagulation.

(B) Sedimentation.

(D) Disinfection.

(3) The concentrations of either chloride or sulfate ~~shall~~ must not exceed two hundred fifty (250) milligrams per liter unless due to naturally occurring sources.

(6) The:

(A) combined concentration of nitrate-N and nitrite-N ~~shall~~ must not exceed ten (10) milligrams per liter; and

(B) concentration of nitrite-N ~~shall~~ must not exceed one (1) milligram per liter.

(7) Chemical constituents in the waters ~~shall~~ must not be present ~~in such~~ at levels ~~as to~~ that prevent, after conventional treatment, meeting the drinking water standards contained in 327 IAC 8-2, due to other than natural causes.

(g) ~~This subsection establishes surface water quality for industrial water supply.~~ In addition to subsection (b), the criterion to ensure protection of water quality at the point at which water is withdrawn for use (either with or without treatment) for industrial cooling and processing is that, other than from naturally occurring sources, the dissolved solids ~~shall~~ must not exceed seven hundred fifty (750) milligrams per liter at any time other than from naturally occurring sources to ensure protection of water quality at the point at which surface water is withdrawn for use, either with or without treatment, for industrial cooling and processing. A specific conductance of one thousand two hundred (1,200) micromhos per centimeter (at twenty-five (25) degrees Celsius) may be considered equivalent to a dissolved solids concentration of seven hundred fifty (750) milligrams per liter.

(h) ~~This subsection establishes surface water quality for agricultural uses.~~ The criteria to ensure surface water quality conditions necessary for agricultural use are the same as those in subsection (b).

(i) ~~This subsection establishes surface water quality for limited uses.~~ The quality of surface waters designated for limited uses under section 19(a) of this rule ~~shall,~~ must, at a minimum, meet the ~~following~~ criteria ~~(1) The criteria~~ contained in ~~subsection~~ subsections (b), ~~(2) The criteria contained in subsection~~ (e), ~~(3) The criteria contained in subsection~~ and (g), ~~(4) The waters must~~ and be aerobic at all times. ~~(5) Notwithstanding subdivisions (1) through (4), the quality of a limited use stream~~ However, the water must meet the criteria that are applicable to the higher use water at the point where it a limited use water:

(1) becomes physically or chemically capable of supporting a higher use; or ~~at its interface~~

(2) interfaces with a higher use water segment. ~~shall meet the criteria that are applicable to the higher use water.~~

(j) Additional requirements for the open waters of Lake Michigan are as follows:

(1) In addition to complying with all other applicable subsections, open waters in Lake Michigan ~~shall~~ must meet the following criteria:



Table 8-9
Additional Criteria for Lake Michigan
Parameters	Criteria
Dissolved oxygen	Dissolved oxygen concentrations ~~shall~~ must not be less than seven (7.0) milligrams per liter ~~at any time at all places~~ outside the applicable mixing zone.
pH	No pH values below six (6.0) or above nine (9.0) are permitted except daily fluctuations that exceed pH 9.0 and are correlated with photosynthetic activity. ~~shall be permitted.~~
Chloride	250 mg/l^[1]
Phenols	~~See~~ The criteria in subsection (c)(1)
Sulfate	250 mg/l^[1]
Total phosphorus	~~See~~ The requirements in 327 IAC 5-10-2
Total dissolved solids	750 mg/l^[1]
Fluoride	1.0 mg/l^[1]
Dissolved iron	300 μg/l^[1]
^[1] This criterion ~~is established to minimize or prevent~~ minimizes or prevents increased levels of this substance in Lake Michigan. For the purposes of establishing water quality-based effluent limitations based on this criterion, it ~~shall~~ must be treated as a four (4) day average criterion.

(2) During each triennial review of the water quality standards, prior to preliminary adoption of revised rules, the following must occur:

(A) The department shall prepare a report for the ~~water pollution control~~ board on the monitoring data for the ~~constituents~~ parameters in ~~the following table~~ Table 8-10, as measured at the drinking water intakes in Lake Michigan.

(B) If ~~these~~ the monitoring data in clause (A) indicate that the levels of the ~~constituents~~ parameters are either increasing or exceed the levels in ~~the~~ Table 8-10, the report ~~shall~~ for the board must provide available information on the known and potential causes of the increased levels of these parameters, the known and potential impacts on aquatic life, wildlife, and human health, and any recommended revisions of the criteria.



Table 8-10
Parameters		Levels
pH		7.5-8.5 s.u.
Chloride
	Monthly average	15 mg/l
	Daily maximum	20 mg/l
Sulfate
	Monthly average	26 mg/l
	Daily maximum	50 mg/l
Total phosphorus
	Monthly average	0.03 mg/l
	Daily maximum	0.04 mg/l
Total dissolved solids
	Monthly average	172 mg/l
	Daily maximum	200 mg/l

(Water Pollution Control Division; 327 IAC 2-1.5-8; filed Jan 14, 1997, 12:00 p.m.: 20 IR 1370; errata filed Aug 11, 1997, 4:15 p.m.: 20 IR 3376; filed Feb 14, 2005, 10:05 a.m.: 28 IR 2074; errata filed Apr 6, 2006, 2:48 p.m.: 29 IR 2546; filed Mar 18, 2008, 2:26 p.m.: 20080416-IR-327060573FRA; filed Jul 9, 2012, 2:54 p.m.: 20120808-IR-327110320FRA)

Notice of Public Hearing

Posted: 11/15/2017 by Legislative Services Agency

DIN: 20171115-IR-327140058SNA

Composed: Apr 19,2024 10:50:03AM EDT

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