-IR- Database Guide
-IR- Database: Indiana Register

TITLE 327 WATER POLLUTION CONTROL DIVISION

Final Rule
LSA Document #14-58

DIGEST

Amends 327 IAC 2-1-6 and 327 IAC 2-1.5-8 concerning revisions to Indiana's aquatic life and human health surface water quality criteria (WQC) for select metals to reflect updates based on current science and National Recommended Water Quality Criteria (NRWQC) at Section 304(a) of the Clean Water Act (CWA). Effective 30 days after filing with the Publisher.


HISTORY
First Notice of Comment Period: March 5, 2014, Indiana Register (DIN: 20140305-IR-327140058FNA).
Second Notice of Comment Period: November 15, 2017, Indiana Register (DIN: 20171115-IR-327140058SNA).
Notice of Public Hearing: November 15, 2017, Indiana Register (DIN: 20171115-IR-327140058PHA).
Continuation of Second Notice of Comment Period: December 20, 2017, Indiana Register (DIN: 20171220-IR-327140058SCA).
Change in Notice of Public Hearing: January 8, 2020, Indiana Register (DIN: 20200108-IR-327140058CHA).
Change in Notice of Public Hearing: January 22, 2020, Indiana Register (DIN: 20200122-IR-327140058CHA).
Change in Notice of Public Hearing: April 8, 2020, Indiana Register (DIN: 20200408-IR-327140058CHA).
Change in Notice of Public Hearing: September 23, 2020, Indiana Register (DIN: 20200923-IR-327140058CHA).
Date of First Hearing: November 18, 2020.
Proposed Rule: April 21, 2021, Indiana Register (DIN: 20210421-IR-327140058PRA).
Notice of Second Hearing: April 21, 2021, Indiana Register (DIN: 20210421-IR-327140058PHA).
Third Comment Period: April 21, 2021, Indiana Register (DIN: 20210421-IR-327140058PRA).
Change in Notice of Public Hearing: June 30, 2021, Indiana Register (DIN: 20210630-IR-327140058CHA).
Date of Second Hearing: August 11, 2021.


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

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

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

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.
(C) Produce:
(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, which incorporates subdivision (3), (5), Table 6-2; which table incorporates subdivision (4), Table 6-3; and
(BB) subdivision (5). (6).
(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, which incorporates subdivision (5), Table 6-2; or
(BB) subdivision (6).
(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, which incorporates subdivision (5), Table 6-2;
(ii) subdivision (3), Table 6-2 (which table incorporates subdivision (4), (4)(A), Table 6-3), and subdivision (5). 6-1a;
(iii) subdivision (4)(B), Table 6-1b;
(iv) subdivision (6); and
(v) subdivision (7), Table 6-4.
(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 a CCC identified in clause (A) is not specified in:
(i) subdivision (3), Table 6-1, which incorporates subdivision (5), Table 6-2;
(ii) subdivision (4)(A), Table 6-1a;
(iii) subdivision (4)(B), Table 6-1b;
(iv) subdivision (6); or
(v) subdivision (7), Table 6-4.
(D) A CCC determined under clause (B) (B)(i), (B)(iv), (B)(v), 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 the protection of aquatic life 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 
Aquatic Life (CAC) (4-Day Average)  Human Health (30-Day Average)  Human Health (30-Day Average) 
Metals (μg/l)         
(Total recoverable)         
Antimony      45,000 (T)  146 (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  #  #     
Lead  #  #    50 (D) 
Mercury$  2.4  0.012  0.15 (T)  0.14 (T) 
Nickel  #  #  100 (T)  13.4 (T) 
Selenium  130*  35 ##    10 (D) 
Silver  #      50 (D) 
Thallium      48 (T)  13 (T) 
Zinc  #  #     
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     
Chlorinea (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 not exceed two (2.0) mg/l in all surface waters outside of the mixing zone except the Ohio River and Interstate Wabash River where it shall not exceed one (1.0) mg/l outside of the mixing zone. 
Sulfate shall not exceed the criteria established in subdivision (6) in all surface waters outside of the mixing zone. 
#The AAC and CAC for this substance are established in Table 6-2.
*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 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 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 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.
Table 6-2
Surface Water Quality Criteria for Specific Substances
Substances  AAC (Maximum) (μg/l)  AAC Conversion Factors  CAC (4-Day Average) (μg/l)  CAC Conversion Factors 
Metals (dissolved)[1] Arsenic (III)  WER[2](360)  1.000  WER[2](190)  1.000 
Cadmium  WER[2](e(1.128 [ln(hardness)]-3.828))  1.136672-[(ln hardness) (0.041838)]  WER[2](e(0.7852 [ln(hardness)]-3.490))  1.101672-[(ln hardness) (0.041838)] 
Chromium (III)  WER[2](e(0.819 [ln(hardness)]+3.688))  0.316  WER[2](e(0.8190 [ln(hardness)]+1.561))  0.860 
Chromium (VI)  WER[2](16)  0.982  WER[2](11)  0.962 
Copper  WER[2](e(0.9422 [ln(hardness)]-1.464))  0.960  WER[2](e(0.8545 [ln(hardness)]-1.465))  0.960 
Lead  WER[2](e(1.273 [ln(hardness)]-1.460))  1.46203-[(ln hardness) (0.145712)]  WER[2](e(1.273 [ln(hardness)]-4.705))  1.46203-[(ln hardness) (0.145712)] 
Nickel  WER[2](e(0.8460 [ln(hardness)]+3.3612))  0.998  WER[2](e(0.8460 [ln(hardness)]+1.1645))  0.997 
Silver  WER[2](e(1.72 [ln(hardness)]-6.52)/2[3])  0.85     
Zinc  WER[2](e(0.8473 [ln(hardness)]+0.8604))  0.978  WER[2](e(0.8473 [ln(hardness)]+0.7614))  0.986 
[1]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 shall 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]A value of one (1) shall 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.

Table 6-1
Surface Water Quality Criteria for the Protection of Aquatic Life
CAS Number  Substances  Acute Aquatic Criteria (AAC) (Maximum) (μg/l)  AAC Conversion Factors (CF)  Chronic Aquatic Criteria (CAC) (4-Day Average) (μg/l)  CAC Conversion Factors (CF) 
  Metals 
7440382    Arsenic[1]  WER(340)(CF)  1.000  WER(150)(CF)  1.000 
7440439    Cadmium[1][2]  WER (e(0.9789[lnH] - 3.866)) (CF)  1.136672- [lnH]0.041838  WER (e(0.7977[lnH]-3.909)) (CF)  1.101672- [lnH]0.041838 
16065831    Chromium (III)[1][2]

 
WER (e(0.819[lnH]+3.7256))(CF)  0.316  WER (e(0.819[lnH]+0.6848))(CF)  0.860 
18540299    Chromium (VI)[1]  WER(16)(CF)  0.982  WER(11)(CF)  0.962 
7440508    Copper[1][2]  WER (e(0.9422[lnH]-1.464))(CF)  0.960  WER (e(0.8545[lnH]-1.465)) (CF)  0.960 
7439921    Lead[1][2]  WER (e(1.273[lnH]-1.460))(CF)  1.46203- [lnH]0.145712  WER (e(1.273[lnH]-4.705)) (CF)  1.46203- [lnH]0.145712 
7439976    Mercury[3][4]  2.4  NA  0.012  NA 
7440020    Nickel[1][2]  WER (e(0.846[lnH]+2.255))(CF)  0.998  WER (e(0.846[lnH]+0.0584))(CF)  0.997 
7440224    Silver[1][2][5]  WER (e(1.72[lnH]-6.59)/2)(CF)  0.85     
7440666    Zinc[1][2]  WER (e(0.8473[lnH]+0.884))(CF)  0.978  WER (e(0.8473[lnH]+0.884)) (CF)  0.986 
  Organics 
309002    Aldrin[4][5]  1.5  NA    NA 
57749    Chlordane[4][5]  1.2  NA  0.0043  NA 
2921882    Chlorpyrifos  0.083  NA  0.041  NA 
50293    DDT[4][5]  0.55  NA  0.0010  NA 
60571    Dieldrin[4][5]  1.3  NA  0.0019  NA 
    Endosulfan[5]  0.11  NA  0.056  NA 
72208    Endrin[4][5]  0.09  NA  0.0023  NA 
76448    Heptachlor[4][5]  0.26  NA  0.0038  NA 
58899    Gamma HCH (Lindane)[4][5]  1.0  NA  0.080  NA 
56382    Parathion  0.065  NA  0.013  NA 
87865    Pentachlorophenol  e(1.005[pH]-4.830)  NA  e(1.005[pH]-5.290)  NA 
    Polychlorinated Biphenyls (PCBs)[4]    NA  0.014  NA 
8001352    Toxaphene[4]  0.73  NA  0.0002  NA 
  Other Substances 
7782505    Chlorine (Total Residual)  19  NA  11  NA 
7782505    Chlorine (intermittent, total residual)[6]      200  NA 
57125    Cyanide (free)  22  NA  5.2  NA 
Selenium CAC are specified in subdivision (4). 
Chloride AAC and CAC are specified in subdivision (6). 
[1]Aquatic life criteria for these metals are expressed as a dissolved concentration and are calculated using the water-effect ratio (WER) and the specified conversion factor (CF). The AAC and CAC for a dissolved metal are calculated by multiplying the WER by the criterion value or formula, and then by the appropriate CF. A value of one (1) must be used for the WER unless an alternate value is established under section 8.9 of this rule. The dissolved AAC and 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 water quality-based effluent limitations (WQBELs).
[2]The hardness values used in the equations for these criteria must not be greater than 400 mg/l as calcium carbonate (CaCO3), and the criteria at a hardness of 400 mg/l as CaCO3 are used for a water hardness above 400 mg/l as CaCO3. The term "lnH" is the natural log of hardness.
[3]Aquatic life criteria for this metal are expressed as a total recoverable concentration.
[4]These substances are bioaccumulative chemicals of concern.
[5]The AAC for these substances is 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 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.
[6]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 these time periods must be separated by at least five (5) hours.
(4) Surface water quality criterion for selenium must meet the following:
(A) The surface water quality criterion for selenium, except for waters where the department has made, and U.S. EPA has approved, a site-specific determination that the criterion in Table 6-1b are applicable, is as follows:
Table 6-1a
Surface Water Quality Aquatic Life Criterion for Selenium (CAS # 7782492)
Chronic Aquatic Criterion (CAC) 
Media Type  Fish Tissue[1]  Water Column[5][7] 
Criterion Element  Egg/Ovary[2]  Fish Whole-Body or Muscle[3]  Monthly Average Exposure  Intermittent Exposure[6] 
Magnitude  15.1 mg/kg dw  8.5 mg/kg dw whole-body or 11.3 mg/kg dw muscle (skinless, boneless filet)  1.5 μg/l in lentic aquatic systems  327140058FRA01.jpg

 
3.1 μg/l in lotic aquatic systems 
Duration  Instantaneous measurement[4]  Instantaneous measurement[4]  Thirty (30) days  Number of days per month with an elevated concentration 
Frequency  Not to be exceeded  Not to be exceeded  Not more than once in three (3) years on average  Not more than once in three (3) years on average 
[1]Fish tissue elements are expressed as steady-state; the aquatic system should not be experiencing new or increasing inputs of selenium.
[2]Egg or ovary supersedes any whole-body, muscle, or water column element when fish egg or ovary concentrations are measured. Any proposal to sample egg or ovary fish tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative egg or ovary fish tissue data to determine compliance with this criterion element.
[3]Fish whole-body or muscle tissue supersedes the water column element when both fish tissue and water concentrations are measured. Any proposal to sample fish whole-body or muscle tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative fish whole-body or muscle tissue data to determine compliance with this criterion element.
[4]Fish tissue data provide instantaneous point measurements that reflect integrative accumulation of selenium over time and space in fish populations at a given site.
[5]Water column values are the applicable criterion element in the absence of steady-state condition fish tissue data and for fishless waters. Water column values are based on dissolved total selenium in water and are derived from fish tissue values via bioaccumulation modeling. Instead of the requirements in 327 IAC 5-2-11.1(b)(2), the allowable mixing zone dilution will be determined by applying the guideline in 327 IAC 2-1-4 to the thirty (30) day, ten (10) year (Q30,10) low flow of the receiving stream for the chronic aquatic criterion (CAC) water column criterion element applicable to lotic aquatic systems, in the absence of site-specific mixing zone data.
[6]Intermittent Exposure Equation variables mean the following:
WQCint is the water column intermittent element.
WQC30-day is the water column monthly element for either lentic or lotic waters.
Cbkgrnd is the average background selenium concentration.
fint is the fraction of any 30-day period during which elevated selenium concentrations occur, with fint assigned a value >0.033 (corresponding to one (1) day).
[7]The water column criterion element may be modified on a site-specific basis in accordance with clause (C).
(B) The surface water quality criterion for selenium, where the department has made, and U.S. EPA has approved, a site-specific determination that fishes in the Order Acipenseriformes (Order includes sturgeon and paddlefish) do not occur at the site, is as follows:
Table 6-1b
Site-specific Surface Water Quality Aquatic Life Criterion for Selenium (CAS # 7782492)
in Non-Acipenseriformes (No Sturgeon or Paddlefish) Waters[1]
Chronic Aquatic Criterion (CAC) 
Media Type  Fish Tissue[2]  Water Column[6][8] 
Criterion Element  Egg/Ovary[3]  Fish Whole-Body or Muscle[4]  Monthly Average Exposure  Intermittent Exposure[7] 
Magnitude  19.0 mg/kg dw  9.5 mg/kg dw whole-body or 13.1 mg/kg dw muscle (skinless, boneless filet)  2.7 μg/l in lentic aquatic systems  327140058FRA02.jpg 
5.5 μg/l in lotic aquatic systems 
Duration  Instantaneous measurement[5]  Instantaneous measurement[5]  Thirty (30) days  Number of days per month with an elevated concentration 
Frequency  Not to be exceeded  Not to be exceeded  Not more than once in three (3) years on average  Not more than once in three (3) years on average 
[1]This criterion is applicable to surface waters for which the department has made, and U.S. EPA has approved, a site-specific determination that fishes in the Order Acipenseriformes do not occur at the site. In making this determination, the department must comply with the procedures in clause (D).
[2]Fish tissue elements are expressed as steady-state; the aquatic system should not be experiencing new or increasing inputs of selenium.
[3]Egg or ovary supersedes any whole-body, muscle, or water column element when fish egg or ovary concentrations are measured. Any proposal to sample egg or ovary fish tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative egg or ovary fish tissue data to determine compliance with this criterion element.
[4]Fish whole-body or muscle tissue supersedes the water column element when both fish tissue and water concentrations are measured. Any proposal to sample fish whole-body or muscle tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative fish whole-body or muscle tissue data to determine compliance with this criterion element.
[5]Fish tissue data provide instantaneous point measurements that reflect integrative accumulation of selenium over time and space in fish populations at a given site.
[6]Water column values are the applicable criterion element in the absence of steady-state condition fish tissue data and for fishless waters. Water column values are based on dissolved total selenium in water and are derived from fish tissue values via bioaccumulation modeling. Instead of the requirements in 327 IAC 5-2-11.1(b)(2), the allowable mixing zone dilution will be determined by applying the guideline in 327 IAC 2-1-4 to the thirty (30) day, ten (10) year (Q30,10) low flow of the receiving stream for the chronic aquatic criterion (CAC) water column criterion element applicable to lotic aquatic systems, in the absence of site-specific mixing zone data.
[7]Intermittent Exposure Equation variables mean the following:
WQCint is the water column intermittent element.
WQC30-day is the water column monthly element for either lentic or lotic waters.
Cbkgrnd is the average background selenium concentration.
fint is the fraction of any 30-day period during which elevated selenium concentrations occur, with fint assigned a value >0.033 (corresponding to one (1) day).
[8]The water column criterion element may be modified on a site-specific basis in accordance with clause (C).
(C) Modification of the selenium water column criterion element must be achieved according to the following:
(i) Site-specific water column criterion elements must be derived using either the empirical bioaccumulation factor (BAF) or mechanistic modeling method provided in Aquatic Life Ambient Water Quality Criterion for Selenium – Freshwater, EPA-822-R-16-006, Appendix K: Translation of a Selenium Fish Tissue Criterion Element to a Site-Specific Water Column Value (June 2016)*.
(ii) Any proposal to derive a site-specific water column criterion element must be submitted to the department for review and approval of the methodology and sampling plan prior to initiation of sampling. The department shall evaluate and approve the applicability of and use of all representative data used to derive a site-specific water column criterion element.
(iii) Any proposal to derive a site-specific water column criterion element must be protective of downstream designated uses for aquatic life and human health.
(iv) Upon receipt of an application for a site-specific water column criterion element, the department shall do the following:
(AA) Publish on the department's website all pertinent information about the proposed site-specific modification.
(BB) Provide notice and request comment on the application.
(v) Upon approval of a site-specific water column criterion element, the department shall do the following:
(AA) Publish a notice in the Indiana Register.
(BB) Place on the department's website all pertinent information about the approved site-specific modification.
(CC) Submit the site-specific modification to U.S. EPA for approval.
(DD) If approved by U.S. EPA, incorporate the site-specific modification into the water quality standards during the next revision of the water quality standards.
(vi) Site-specific modifications of this criterion must not be incorporated into a final NPDES permit or used for other Clean Water Act purposes until approved by U.S. EPA.
(D) Upon receipt of an application for a site-specific determination that fishes in the Order Acipenseriformes (Order includes sturgeon and paddlefish) do not occur at the site, the department shall do the following:
(i) Review available species occurrence and distribution information and do one (1) of the following:
(AA) Make a tentative determination that fishes in the Order Acipenseriformes do not occur at the site.
(BB) Make a determination that fishes in the Order Acipenseriformes occur at the site and deny the application.
(ii) Upon a tentative determination that fishes in the Order Acipenseriformes do not occur at the site, the department shall do the following:
(AA) Publish on the department's website all pertinent information about the proposed site-specific determination.
(BB) Provide notice and request comment on the tentative decision.
(iii) Upon a final determination that fishes in the Order Acipenseriformes do not occur at the site, the department shall do the following:
(AA) Publish a notice in the Indiana Register.
(BB) Place on the department's website all pertinent information about the approved site-specific modification.
(CC) Submit the site-specific modification to U.S. EPA for approval.
(DD) If approved by U.S. EPA, incorporate the site-specific modification into the water quality standards during the next revision of the water quality standards.
(iv) Site-specific modifications of this criterion must not be incorporated into a final NPDES permit or used for other Clean Water Act purposes until approved by U.S. EPA.
(4) (5) 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 6-1, with a value of one (1) used for the WER are as follows:
Table 6-3 6-2 
Metals Concentrations in Micrograms Per Liter; Hardness in Milligrams Per Liter CaCO31 
  Arsenic (III)  Cadmium  Chromium (III)  Chromium (VI)  Copper 
Hardness  AAC  CAC  AAC  CAC  AAC  CAC  AAC  CAC  AAC  CAC 
50  360 340  190 150  1.7 0.94  0.62 0.43  310 320  100 42  16  11  8.9  6.3 
100  360 340  190 150  3.7 1.8  1.0 0.72  550 570  180 74  16  11  17  11 
150  360 340  190 150  5.7 2.6  1.4 0.97  760 790  250 100  16  11  25  16 
200  360 340  190 150  7.8 3.4  1.7 1.2  970 1,000  310 130  16  11  33  21 
250  360 340  190 150  10 4.2  2.0 1.4  1200  380 160  16  11  40  25 
300  360 340  190 150  12 5.0  2.3 1.6  1300 1,400  440 180  16  11  48  29 
350  360 340  190 150  14 5.8  2.6 1.8  1500 1,600  500 210  16  11  55  33 
400  360 340  190 150  17 6.5  2.9 2.0  1700 1,800  550 230  16  11  63  37 
450  360  190  19  3.1  1900  610  16  11  70  41 
500  360  190  21  3.4  2100  670  16  11  78  45 
                     
  Lead  Nickel  Silver  Zinc     
Hardness  AAC  CAC  AAC  CAC  AAC  CAC  AAC  CAC     
50  30  1.2  790 260  87 29  0.52 0.49  –  64 65  58 66     
100  65  2.5  1400 470  160 52  1.7 1.6  –  110 120  100 120     
150  100  3.9  2000 660  220 73  3.5 3.2  –  160 170  150 170     
200  140  5.3  2500 840  280 93  5.7 5.3  –  210  190 210     
250  170  6.7  3100 1,000  340 110  8.3 7.8  –  250  230 260     
300  210  8.1  3600 1,200  400 130  11  –  290 300  270 300     
350  240  9.5  4100 1,400  450 150  15 14  –  330 340  300 340     
400  280  11  4600 1,500  510 170  19 17  –  370 380  340 380     
450  320  12  5100  560  23  –  410  370     
500  350  14  5500  610  27  –  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. Table 6-1. The equations and conversion factors in subdivision (3), Table 6-2 shall Table 6-1 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 (6) 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), (8), 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 (in mg/l as CaCO3) 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 as follows:
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 table 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 (in mg/l as CaCO3) 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 as follows:
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 table when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs. 
(7) Surface water quality criteria for protection of human health for specific substances are as follows:
 
Table 6-4 
Surface Water Quality Criteria for Protection of Human Health[1] 
CAS Number  Substances  Continuous Criterion Concentrations 
Outside of Mixing Zone (μg/l)  Point of Water Intake (μg/l) 
  Metals (total recoverable) 
7440360    Antimony  640 (T)  5.6 (T) 
    Arsenic III  0.175 (C)  0.022 (C) 
7440393    Barium    1,000 (D) 
7440508    Copper    1,300 (D) 
7439976    Mercury[2]  0.15 (T)  0.14 (T) 
7440020    Nickel  4,600 (T)  610 (T) 
7782492    Selenium  4,200 (T)  170 (T) 
7440280    Thallium  48 (T)  13 (T) 
7440666    Zinc  26,000 (T)  7,400 (T) 
  Organics 
107028    Acrolein  780 (T)  320 (T) 
107131    Acrylonitrile  6.5 (C)  0.58 (C) 
309002    Aldrin[2]  0.00079 (C)  0.00074 (C) 
71432    Benzene  400 (C)  6.6 (C) 
92875    Benzidine  0.0053 (C)  0.0012 (C) 
56235    Carbon Tetrachloride  69.4 (C)  4.0 (C) 
57749    Chlordane[2]  0.0048 (C)  0.0046 (C) 
  Chlorinated Benzenes 
108907    Monochlorobenzene    488 (T) 
95943    1,2,4,5-Tetrachlorobenzene[2]  48 (T)  38 (T) 
608935    Pentachlorobenzene[2]  85 (T)  74 (T) 
118741    Hexachlorobenzene[2]  0.0074 (C)  0.0072 (C) 
  Chlorinated Ethanes 
107062    1,2-dichloroethane  2,430 (C)  9.4 (C) 
71556    1,1,1-trichloroethane  1,030,000 (T)  18,400 (T) 
79005    1,1,2-trichloroethane  418 (C)  6.0 (C) 
79345    1,1,2,2-tetrachloroethane  107 (C)  1.7 (C) 
67721    Hexachloroethane  87.4 (C)  19 (C) 
  Chlorinated Phenols 
95954    2,4,5-trichlorophenol    2,600 (T) 
88062    2,4,6-trichlorophenol  36 (C)  12 (C) 
  Chloroalkyl Ethers 
    bis(2-chloroisopropyl) ether  4,360 (T)  34.7 (T) 
542881    bis(chloromethyl) ether  0.018 (C)  0.000038 (C) 
111444    bis(2-chloroethyl) ether  13.6 (C)  0.3 (C) 
67663    Chloroform  157 (C)  1.9 (C) 
50293    DDT[2]  0.00024 (C)  0.00024 (C) 
    Dichlorobenzenes  2,600 (T)  400 (T) 
    Dichlorobenzidine  0.2 (C)  0.1 (C) 
75354    1,1-dichloroethylene  18.5 (C)  0.33 (C) 
120832    2,4-dichlorophenol    3,090 (T) 
    Dichloropropenes  14,100 (T)  87 (T) 
60571    Dieldrin[2]  0.00076 (C)  0.00071 (C) 
121142    2,4-dinitrotoluene  91 (C)  1.1 (C) 
1746016    Dioxin (2,3,7,8-TCDD)[2]  0.0000001 (C)  0.0000001 (C) 
122667   1,2-diphenylhydrazine  5.6 (C)  0.422 (C) 
    Endosulfan  159 (T)  74 (T) 
72208    Endrin[2]    1.0 (D) 
100414    Ethylbenzene  3,280 (T)  1,400 (T) 
206440    Fluoranthene  54 (T)  42 (T) 
    Halomethanes  157 (C)  1.9 (C) 
76448    Heptachlor[2]  0.0028 (C)  0.0028 (C) 
87683    Hexachlorobutadiene[2]  500 (C)  4.47 (C) 
    Hexachlorocyclohexane (HCH)     
319846    alpha HCH[2]  0.31 (C)  0.09 (C) 
319857    beta HCH[2]  0.55 (C)  0.16 (C) 
58899    gamma HCH (Lindane)[2]  0.63 (C)  0.19 (C) 
608731    Technical HCH[2]  0.41 (C)  0.12 (C) 
77474    Hexachlorocyclopentadiene    206 (T) 
78591    Isophorone  520,000 (T)  5,200 (T) 
98953    Nitrobenzene    19,800 (T) 
  Nitrophenols 
534521    4,6-dinitro-o-cresol  765 (T)  13.4 (T) 
25550587    Dinitrophenol  14,300 (T)  70 (T) 
  Nitrosamines 
55185    N-nitrosodiethylamine  12.4 (C)  0.008 (C) 
62759    N-nitrosodimethylamine  160 (C)  0.014 (C) 
924163    N-nitrosodibutylamine  5.9 (C)  0.064 (C) 
86306    N-nitrosodiphenylamine  161 (C)  49 (C) 
930552    N-nitrosopyrrolidine  919 (C)  0.16 (C) 
87865    Pentachlorophenol    1,000 (T) 
108952    Phenol    3,500 (T) 
  Phthalate Esters 
131113    Dimethyl phthalate  2,900,000 (T)  313,000 (T) 
84662    Diethyl phthalate  1,800,000 (T)  350,000 (T) 
84742    Dibutyl phthalate  154,000 (T)  34,000 (T) 
117817    Di-2-ethylhexyl phthalate  50,000 (T)  15,000 (T) 
    Polychlorinated Biphenyls (PCBs)[2]  0.00079 (C)  0.00079 (C) 
    Carcinogenic Polynuclear Aromatic Hydrocarbons (PAHs)  0.31 (C)  0.028 (C) 
127184    Tetrachloroethylene  88.5 (C)  8 (C) 
108883    Toluene  424,000 (T)  14,300 (T) 
8001352    Toxaphene[2]  0.0073 (C)  0.0071 (C) 
79016    Trichloroethylene  807 (C)  27 (C) 
75014    Vinyl Chloride  5,246 (C)  20 (C) 
  Other Substances 
1332214    Asbestos (fibers/liter)    300,000 (C) 
57125    Cyanide (Total)    200 (D) 
[1]The human health criteria are thirty (30) day average criteria. 
T-derived from threshold toxicity 
C-derived from nonthreshold cancer risk 
D-derived from drinking water standards, equal to or less than threshold toxicity 
[2]This substance is a bioaccumulative chemical of concern. 
(6) The following establishes (8) Surface water quality criteria for sulfate that shall must not be exceeded in all surface waters 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) (6) 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 (in mg/l as CaCO3) 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: as follows:
                       
Table 6-5[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 
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 table when sulfate criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs. 
(9) Fluoride must not exceed two (2.0) mg/l in surface waters outside of a mixing zone except in the Ohio River and Interstate Wabash River where it must not exceed one (1.0) mg/l outside of a mixing zone.

(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.
(C) The maximum temperature rise at any time or place above natural temperatures shall must not exceed:
(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:
(i) 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 locations exceed the maximum limits in the following table and
(ii) by more than three (3) degrees Fahrenheit (one and seven-tenths (1.7) degrees Celsius):
         
    Table 6-4 6-6   
    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 6-7 
Maximum Ammonia Concentrations (Unionized Ammonia as N)*** 
(mg/l) Temperature (°C) 
pH  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 this table by the value determined by: 1/(10pK a -pH + 1). 
Where:  pKa  0.09018 + (2729.92/(T + 273.2)) 
  pH  pH of water 
  °C 
               
Table 6-8 
24-Hour Average Ammonia Concentrations (Unionized Ammonia as N)*** 
(mg/l) Temperature (°C) 
pH  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 this table by the value determined by: 1/(10pK a -pH + 1). 
Where:  pKa  0.09018 + (2729.92/(T + 273.2)) 
  pH  pH of water 
  °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 waters outside of the a mixing zone in the surface waters designated as salmonid waters 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.
(C) Establish effluent limits during the recreational season.
(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.
(C) Filtration.
(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 as a thirty (30) day average value; and
(B) concentration of nitrite-N must not exceed one (1) milligram per liter as a thirty (30) day average value.
(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 (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.

*This document is incorporated by reference. Copies may be obtained from the U.S. EPA National Service Center for Environmental Publications (www.epa.gov/nscep), or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, Thirteenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.
(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; filed Nov 5, 2021, 12:56 p.m.: 20211201-IR-327140058FRA)


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

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.
(C) Produce:
(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, the surface waters shall must meet the following requirements:
(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, subdivision (4), Table 8-2, 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) TUa 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) TUa is not exceeded outside the applicable alternate mixing zone. 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 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, which is determined 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, subdivision (3), Table 8-1a, subdivision (4), Table 8-2, 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) (i)(AA), (i)(CC), 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) TUc 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, which is 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, which is determined 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, which is determined 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] 
CAS Number  Substances  CMC (Maximum) (μg/l)  CMC Conversion Factors  CCC (4-Day Average) (μg/l)  CCC Conversion Factors 
  Metals (dissolved)[2] 
7440382    Arsenic (III)  WER[3](339.8)

 
1.000  WER[3](147.9)  1.000 
7440439    Cadmium  WER[3](e(1.128 [ln(hardness)]-3.6867))  1.136672-[(ln hardness) (0.041838)]  WER[3](e(0.7852 [ln(hardness)]-2.715))  1.101672-[(ln hardness) (0.041838)] 
7440473    Chromium (III)  WER[3](e(0.819 [ln(hardness)] + 3.7256))  0.316  WER[3](e(0.819 [ln(hardness)] + 0.6848))  0.860 
7440473    Chromium (VI)  WER[3](16.02)  0.982  WER[3](10.98)  0.962 
7440508    Copper  WER[3](e(0.9422 [ln(hardness)]-1.700))  0.960  WER[3](e(0.8545 [ln(hardness)]-1.702))  0.960 
7439976    Mercury  WER[3](1.694)  0.85  WER[3](0.9081)  0.85 
7440020    Nickel  WER[3](e(0.846 [ln(hardness)] + 2.255))  0.998  WER[3](e(0.846 [ln(hardness)] + 0.0584))  0.997 
7782492    Selenium      5  0.922 
7440666    Zinc  WER[3](e(0.8473 [ln(hardness)] + 0.884))  0.978  WER[3](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]  NA  [6]  NA 
    Chlorine (total residual)  19  NA  11  NA 
    Chlorine (intermittent, total residual)[5]  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]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 shall 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]A value of one (1) shall be used for the WER unless an alternate value is established under section 16 of this rule. 
[4]A CMC and CCC calculated for pentachlorophenol using the equation in this table shall 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]The CMC and CCC for this substance are established in subdivision (5). 
(A) The surface water quality criteria for the protection of aquatic life for specific substances are as follows:
Table 8-1 
Surface Water Quality Criteria for Protection of Aquatic Life 
CAS Number  Substances  Criterion Maximum Concentration (CMC) (Maximum) (μg/L)[1]  CMC Conversion Factors (CF)  Criterion Continuous Concentration (CCC) (4-Day Average) (μg/L)[1]  CCC Conversion Factors (CF) 
Metals (dissolved)[2][3] 
7440382  Arsenic  WER(340)(CF)  1.000  WER(150)(CF)  1.000 
7440439  Cadmium  WER (e(0.9789 [lnH] - 3.866))(CF)  1.136672 - [lnH] 0.041838  WER (e(0.7977[lnH] - 3.909))(CF)  1.101672 - [ln H]0.041838 
7440473  Chromium (III)  WER (e(0.819 [lnH] + 3.7256))(CF)  0.316  WER (e(0.819 [lnH] + 0.6848))(CF)  0.860 
7440473  Chromium (VI)  WER(16)(CF)  0.982  WER(11)(CF)  0.962 
7440508  Copper  WER (e(0.9422[lnH] - 1.700))(CF)  0.960  WER (e(0.8545[lnH] - 1.702))(CF)  0.960 
7439921  Lead  WER (e(1.273[lnH] - 1.460))(CF)  1.46203 - [lnH]0.145712  WER (e(1.273[lnH] - 4.705))(CF)  1.46203 - [lnH]0.145712 
7439976  Mercury  WER(1.694)(CF)  0.85  WER(0.9081)(CF)  0.85 
7440020  Nickel  WER (e(0.846 [lnH] + 2.255))(CF)  0.998  WER (e(0.846 [lnH] + 0.0584))(CF)  0.997 
7440666  Zinc  WER (e(0.8473 [lnH] + 0.884))(CF)  0.978  WER (e(0.8473 [lnH] + 0.884))(CF)  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]  e(1.005[pH] - 4.869)  NA  e(1.005[pH] - 5.134)  NA 
Other Substances 
  Chlorine (total residual)  19  NA  11  NA 
  Chlorine (intermittent, total residual)[5]  200  NA    NA 
57125  Cyanide (free)  22  NA  5.2  NA 
Selenium CCC are specified in clause (B) 
Chloride CMC and CCC are specified in subdivision (5)[1] 
[1]Aquatic organisms should not be affected unacceptably if the four (4) day average concentration specified in this table for a substance 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]Aquatic life criteria for these metals are expressed as a dissolved concentration and are calculated using the water-effect ratio (WER) and the specified conversion factor (CF). The CMC and CCC for a dissolved metal are calculated by multiplying the WER by the criterion value or formula and then by the appropriate CF. A value of one (1) must be used for the WER unless an alternate value is established under section 16 of this rule. The dissolved CMC and 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 water quality-based effluent limitations (WQBELs). 
[3]The hardness values used in the equations for these criteria must not be greater than 400 mg/l as calcium carbonate (CaCO3), and the criteria at a hardness of 400 mg/l as CaCO3 are used for a water hardness above 400 mg/l as CaCO3. The term "lnH" is the natural log of hardness. 
[4]A CMC and CCC calculated for pentachlorophenol using the equation in this table 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 must not be detected in the discharge for a period of more than forty (40) minutes in duration, and these time periods must be separated by at least five (5) hours. 
(B) The surface water quality criterion for the protection of aquatic life for selenium is as follows:
Table 8-1a 
Surface Water Quality Aquatic Life Criterion for Selenium (CAS # 7782492) 
Criterion Continuous Concentration (CCC) 
Media Type  Fish Tissue[1]  Water Column[5][7] 
Criterion Element  Egg/Ovary[2]  Fish Whole-Body or Muscle[3]  Monthly Average Exposure  Intermittent Exposure[6] 
Magnitude  15.1 mg/kg dw  8.5 mg/kg dw whole-body or 11.3 mg/kg dw muscle (skinless, boneless filet)  1.5 μg/l in lentic aquatic systems

3.1 μg/l in lotic aquatic systems 
327140058FRA03.jpg

 
Duration  Instantaneous measurement[4]  Instantaneous measurement[4]  Thirty (30) days  Number of days per month with an elevated concentration 
Frequency  Not to be exceeded  Not to be exceeded  Not more than once in three (3) years on average  Not more than once in three (3) years on average 
[1]Fish tissue elements are expressed as steady-state; the aquatic system should not be experiencing new or increasing inputs of selenium.
[2]Egg or ovary supersedes any whole-body, muscle, or water column element when fish egg or ovary concentrations are measured. Any proposal to sample egg or ovary fish tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative egg or ovary fish tissue data to determine compliance with this criterion element.
[3]Fish whole-body or muscle tissue supersedes the water column element when both fish tissue and water concentrations are measured. Any proposal to sample fish whole-body or muscle tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative fish whole-body or muscle tissue data to determine compliance with this criterion element.
[4]Fish tissue data provide instantaneous point measurements that reflect integrative accumulation of selenium over time and space in fish populations at a given site.
[5]Water column values are the applicable criterion element in the absence of steady-state condition fish tissue data and for fishless waters. Water column values are based on dissolved total selenium in water and are derived from fish tissue values via bioaccumulation modeling. Instead of the requirement in 327 IAC 5-2-11.4(b)(3)(A)(i)(CC), the thirty (30) day, ten (10) year stream design flow (Q30,10) must be used for deriving total maximum daily loads (TMDLs), waste load allocations (WLAs) in the absence of TMDLs, and preliminary WLAs for tributaries of the Great Lakes system that exhibit appreciable flows relative to their volumes for the CCC water column criterion element applicable to lotic aquatic systems unless data exist to demonstrate that an alternate stream design flow is appropriate for stream-specific and pollutant-specific conditions.
[6]Intermittent Exposure Equation variables mean the following:
WQCint is the water column intermittent element.
WQC30-day is the water column monthly element for either lentic or lotic waters.
Cbkgrnd is the average background selenium concentration.
fint is the fraction of any 30-day period during which elevated selenium concentrations occur, with fint assigned a value >0.033 (corresponding to one (1) day).
[7]The water column criterion element may be modified on a site-specific basis in accordance with clause (C).
(C) Modification of the selenium water column criterion element must be achieved according to the following:
(i) Site-specific water column criterion elements must be derived using either the empirical bioaccumulation factor (BAF) or mechanistic modeling method provided in Aquatic Life Ambient Water Quality Criterion for Selenium – Freshwater, EPA-822-R-16-006, Appendix K: Translation of a Selenium Fish Tissue Criterion Element to a Site-Specific Water Column Value (June 2016)*.
(ii) Any proposal to derive a site-specific water column criterion element must be submitted to the department for review and approval of the methodology and sampling plan prior to initiation of sampling. The department shall evaluate and approve the applicability of and use of all representative data used to derive a site-specific water column criterion element.
(iii) Any proposal to derive a site-specific water column criterion element must be protective of downstream designated uses for aquatic life and human health.
(iv) Upon receipt of an application for a site-specific water column criterion element, the department shall do the following:
(AA) Publish on the department's website all pertinent information about the proposed site-specific modification.
(BB) Provide notice and request comment on the application.
(v) Upon approval of a site-specific water column criterion element, the department shall do the following:
(AA) Publish a notice in the Indiana Register.
(BB) Place on the department's website all pertinent information about the approved site-specific modification.
(CC) Submit the site-specific modification to U.S. EPA for approval.
(DD) If approved by U.S. EPA, incorporate the site-specific modification into the water quality standards during the next revision of the water quality standards.
(vi) Site-specific modifications of this criterion must not be incorporated into a final NPDES permit or used for other Clean Water Act purposes until approved by U.S. EPA.
(4) The following establishes dissolved CMCs CMC and CCCs CCC for certain metals at selected hardness values calculated from the equations and conversion factors in subdivision (3), Table 8-1 and using with a value of one (1) used for the WER where applicable, are as follows:
                     
Table 8-2 
Metals Concentrations in Micrograms Per Liter; Hardness in Milligrams Per Liter CaCO3[1] 
  Arsenic (III)  Cadmium  Chromium (III)  Chromium (VI)  Copper 
Hardness  CMC  CCC  CMC  CCC  CMC  CCC  CMC  CCC  CMC  CCC 
50  340  150  2.0 0.94  1.3 0.43  320  42  16  11  7.0  5.0 
100  340  150  4.3 1.8  2.2 0.72  570  74  16  11  13  9.0 
150  340  150  6.6 2.6  3.0 0.97  790  100  16  11  20  13 
200  340  150  9.0 3.4  3.7 1.2  1,000  130  16  11  26  16 
250  340  150  12 4.2  4.4 1.4  1,200  160  16  11  32  20 
300  340  150  14 5.0  5.0 1.6  1,400  180  16  11  38  23 
350  340  150  17 5.8  5.6 1.8  1,600  210  16  11  44  26 
400  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  Mercury  Nickel  Selenium  Zinc 
Hardness  CMC  CCC  CMC  CCC  CMC  CCC  CMC  CCC  CMC  CCC 
50  30  1.2  1.4  0.77  260  29    4.6  65  66 
100  65  2.5  1.4  0.77  470  52    4.6  120  120 
150  100  3.9  1.4  0.77  660  73    4.6  170  170 
200  140  5.3  1.4  0.77  840  93    4.6  210  210 
250  170  6.7  1.4  0.77  1,000  110    4.6  250  260 
300  210  8.1  1.4  0.77  1,200  130    4.6  300  300 
350  240  9.5  1.4  0.77  1,400  150    4.6  340  340 
400  280  11  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 (in mg/l as CaCO3) 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 as follows:
                     
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 table 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 (in mg/l as CaCO3) 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 as follows:
                     
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 table 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  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:
(i) 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 locations exceed the maximum limits in the following table and
(ii) 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 (Btu) 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 Btu 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 Btu 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:
327140058FRA04.jpg
           
Where:  FT  100.03(20-T) 
  FPH  1; when: 8 < pH < 9; or 
      1 + 10(7.4 - pH)  ; when: 6.5 < pH <
      1.25 
  pKa  0.09018 +  2729   
  T + 273.2   
  Temperature in °C 
(B) The CCC of total ammonia (as N) is determined using the following equation:
327140058FRA05.jpg
           
Where:  FT  100.03(20-T)     
  FPH  1; when: 8 < pH < 9; or   
      1 + 10(7.4 - pH)  ; when: 6.5 < pH <
      1.25 
  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) 
  pKa  0.09018 +  2729   
  T + 273.2   
  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  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  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 designated by the Indiana department of natural resources for put-and-take trout fishing and 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 waters outside of the applicable a mixing zone, as determined in accordance with section 7 of this rule, in the surface waters designated as salmonid waters 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.
(C) Establish effluent limits during the recreational season.
(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) 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:
(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.

(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.
(C) Filtration.
(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 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 (WQBEL) 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   
*This document is incorporated by reference. Copies may be obtained from the U.S. EPA National Service Center for Environmental Publications (www.epa.gov/nscep), or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, Thirteenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.
(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; filed Nov 5, 2021, 12:56 p.m.: 20211201-IR-327140058FRA)



LSA Document #14-58(F)
Proposed Rule: 20210421-IR-327140058PRA
Hearing Held: August 11, 2021
Approved by Attorney General: October 26, 2021
Approved by Governor: November 2, 2021
Filed with Publisher: November 5, 2021, 12:56 p.m.
Documents Incorporated by Reference: Aquatic Life Ambient Water Quality Criterion for Selenium – Freshwater, EPA-822-R-16-006, Appendix K: Translation of a Selenium Fish Tissue Criterion Element to a Site-Specific Water Column Value (June 2016)
Small Business Regulatory Coordinator: Angela Taylor, IDEM Small Business Regulatory Coordinator/CTAP Small Business Liaison, IGCN 1316, 100 North Senate Avenue, Indianapolis, IN 46204-2251, (317) 233-0572 or (800) 988-7901, ctap@idem.in.gov
Small Business Assistance Program Ombudsman: Erin Moorhous, IDEM Small Business Assistance Program Ombudsman/Business, Agricultural, and Legislative Liaison, IGCN 1301, 100 North Senate Avenue, Indianapolis, IN 46204-2251, (317) 232-8921 or (800) 451-6027, emoorhous@idem.in.gov

Posted: 12/01/2021 by Legislative Services Agency

DIN: 20211201-IR-327140058FRA
Composed: Nov 27,2022 5:00:24AM EST
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