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

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

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

1. (1) All surface waters, including waters within a mixing zone, 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:

   1. (A) Settle to form putrescent or otherwise objectionable deposits.
   2. (B) Occur in amounts sufficient to be unsightly or deleterious.

   3. (C) Produce:

      1. (i) color;
      2. (ii) visible oil sheen;
      3. (iii) odor; or
      4. (iv) other conditions;
   4. to an extent that creates a nuisance.

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

      1. (i) create a nuisance;
      2. (ii) be unsightly; or
      3. (iii) otherwise impair the designated uses of the surface waters.

   6. (E) Occur in amounts sufficient to be acutely toxic to, or to otherwise severely injure or kill, aquatic life, other animals, plants, or humans. To ensure protection of aquatic life, concentrations of toxic substances 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:

      1. (i) For certain substances, an AAC is specified in:

         1. (AA) subdivision (3), Table 6-1, which incorporates subdivision (5), Table 6-2; and
         2. (BB) subdivision (6).

      2. (ii) An AAC may be calculated by the commissioner using the procedures in section 8.2 of this rule for substances for which an AAC is not specified in:

         1. (AA) subdivision (3), Table 6-1, which incorporates subdivision (5), Table 6-2; or
         2. (BB) subdivision (6).
      3. (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.
   7. (F) Clause (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. (2) All surface waters outside of mixing zones 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. The requirements to ensure protection against the adverse effects identified in this subdivision are as follows:

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

      1. (i) A chronic aquatic criterion (CAC) to protect aquatic life from chronic toxic effects.
      2. (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.
      3. (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.
      4. (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.

   2. (B) For certain substances, one (1) or more of the CCCs identified in clause (A) are specified in:

      1. (i) subdivision (3), Table 6-1, which incorporates subdivision (5), Table 6-2;
      2. (ii) subdivision (4)(A), Table 6-1a;
      3. (iii) subdivision (4)(B), Table 6-1b;
      4. (iv) subdivision (6); and
      5. (v) subdivision (7), Table 6-4.

   3. (C) 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:

      1. (i) subdivision (3), Table 6-1, which incorporates subdivision (5), Table 6-2;
      2. (ii) subdivision (4)(A), Table 6-1a;
      3. (iii) subdivision (4)(B), Table 6-1b;
      4. (iv) subdivision (6); or
      5. (v) subdivision (7), Table 6-4.
   4. (D) A CCC determined under clause (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.
   5. (E) The CAC and TLSC for a substance apply in all surface waters outside of a mixing zone for a discharge of that substance.
   6. (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 apply to all surface waters outside of the mixing zone for a discharge of that substance.
   7. (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 apply at the point of the public water system intake.

3. (3) Surface water quality criteria for the protection of aquatic life for specific substances are as follows: 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    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 (Q_30,10) 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:

WQC_int is the water column intermittent element.

WQC_30-day is the water column monthly element for either lentic or lotic waters.

C_bkgrnd is the average background selenium concentration.

f_int is the fraction of any 30-day period during which elevated selenium concentrations occur, with f_int assigned a value >0.033 (corresponding to one (1) day).

^[7]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    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 (Q_30,10) 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:

WQC_int is the water column intermittent element.

WQC_30-day is the water column monthly element for either lentic or lotic waters.

C_bkgrnd is the average background selenium concentration.

f_int is the fraction of any 30-day period during which elevated selenium concentrations occur, with f_int assigned a value >0.033 (corresponding to one (1) day).

^[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.

(5) The dissolved AAC and CAC for certain metals at selected hardness values calculated from the equations and conversion factors in subdivision (3), Table 6-1, with a value of one (1) used for the WER are as follows: Table 6-2  Metals Concentrations in Micrograms Per Liter; Hardness in Milligrams Per Liter CaCO₃₁    Arsenic  Cadmium  Chromium (III)  Chromium (VI)  Copper  Hardness  AAC  CAC  AAC  CAC  AAC  CAC  AAC  CAC  AAC  CAC  50  340  150  0.94  0.43  320  42  16  11  8.9  6.3  100  340  150  1.8  0.72  570  74  16  11  17  11  150  340  150  2.6  0.97  790  100  16  11  25  16  200  340  150  3.4  1.2  1,000  130  16  11  33  21  250  340  150  4.2  1.4  1200  160  16  11  40  25  300  340  150  5.0  1.6  1,400  180  16  11  48  29  350  340  150  5.8  1.8  1,600  210  16  11  55  33  400  340  150  6.5  2.0  1,800  230  16  11  63  37                                                                      Lead  Nickel  Silver  Zinc      Hardness  AAC  CAC  AAC  CAC  AAC  CAC  AAC  CAC      50  30  1.2  260  29  0.49  –  65  66      100  65  2.5  470  52  1.6  –  120  120      150  100  3.9  660  73  3.2  –  170  170      200  140  5.3  840  93  5.3  –  210  210      250  170  6.7  1,000  110  7.8  –  250  260      300  210  8.1  1,200  130  11  –  300  300      350  240  9.5  1,400  150  14  –  340  340      400  280  11  1,500  170  17  –  380  380                                                  ^[1] The dissolved metals criteria in this table have been rounded to two (2) significant digits in accordance with subdivision (3), Table 6-1. The equations and conversion factors in subdivision (3), Table 6-1 must be used instead of the criteria in this table when these criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(6) Surface water quality criteria for chloride for protection of aquatic life are as follows: (A) 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 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) 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 (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 (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 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 AAC for chloride in mg/l at selected concentrations of hardness (in mg/l as CaCO₃) and sulfate 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 CAC for chloride in mg/l at selected concentrations of hardness (in mg/l as CaCO₃) and sulfate 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.

(8) Surface water quality criteria for sulfate that must not be exceeded in surface waters outside of a mixing zone are as follows: (A) The 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 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) 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 (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 (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) 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 surface water quality criteria for sulfate in mg/l at selected concentrations of hardness (in mg/l as CaCO₃) and chloride are 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  5  500  515  703  891  1080  1268  1456  1644  1832  2020  2020  10  500  691  879  1067  1256  1444  1632  1820  2008  2196  2196  15  500  867  1055  1243  1432  1620  1808  1996  2184  2372  2372  20  500  1043  1231  1419  1608  1796  1984  2172  2360  2549  2549  25  500  1164  1343  1522  1701  1880  2059  2238  2417  2596  2596  50  500  1141  1320  1499  1678  1857  2036  2215  2394  2573  2573  100  500  1093  1272  1451  1630  1809  1988  2167  2346  2525  2525  150  500  1046  1225  1404  1583  1762  1941  2120  2299  2478  2478  200  500  998  1177  1356  1535  1715  1894  2073  2252  2431  2431  250  500  951  1130  1309  1488  1667  1846  2025  2204  2383  2383  ^[1]The equations in clause (A) must be used instead of the criteria in this 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) In addition to subsection (a), the following minimum conditions are applicable in the surface waters outside of a mixing zone to ensure conditions necessary for the maintenance of a well-balanced aquatic community:

1. (1) There must be no substance that:

   1. (A) imparts unpalatable flavor to food fish; or
   2. (B) results in offensive odors in the vicinity of the water.

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

   1. (A) exceed pH nine (9.0); and
   2. (B) are correlated with photosynthetic activity.

3. (3) Concentrations of dissolved oxygen must:

   1. (A) average at least five (5.0) milligrams per liter per calendar day; and
   2. (B) not be less than four (4.0) milligrams per liter at any time.

4. (4) Conditions for temperature are as follows:

   1. (A) Abnormal temperature changes that may adversely affect aquatic life are prohibited unless caused by natural conditions.
   2. (B) The normal daily and seasonal temperature fluctuations that existed before the addition of heat due to other than natural causes must be maintained.

   3. (C) The maximum temperature rise at any time or place above natural temperatures must not exceed:

      1. (i) five (5) degrees Fahrenheit (two and eight-tenths (2.8) degrees Celsius) in streams; and
      2. (ii) three (3) degrees Fahrenheit (one and seven-tenths (1.7) degrees Celsius) in lakes and reservoirs.

   4. (D) Water temperatures must not exceed the maximum limits in the following table:

      1. (i) during more than one percent (1%) of the hours in the twelve (12) month period ending with any month; and

      2. (ii) by more than three (3) degrees Fahrenheit (one and seven-tenths (1.7) degrees Celsius):

         		Table 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. (5) The following criteria must be used to regulate ammonia:

   1. (A) Except for waters covered in clause (B), surface waters outside of mixing zones 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:

      1. (i) humans;
      2. (ii) animals;
      3. (iii) aquatic life; or
      4. (iv) plants.

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

      Table 6-7
      Maximum Ammonia Concentrations (Unionized Ammonia as N)***
      (mg/l) Temperature (°C)
      pH	0	5	10	15	20	25	30
      6.5	0.0075	0.0106	0.0150	0.0211	0.0299	0.0299	0.0299
      6.6	0.0092	0.0130	0.0183	0.0259	0.0365	0.0365	0.0365
      6.7	0.0112	0.0158	0.0223	0.0315	0.0444	0.0444	0.0444
      6.8	0.0135	0.0190	0.0269	0.0380	0.0536	0.0536	0.0536
      6.9	0.0161	0.0228	0.0322	0.0454	0.0642	0.0642	0.0642
      7.0	0.0191	0.0270	0.0381	0.0539	0.0761	0.0761	0.0761
      7.1	0.0244	0.0316	0.0447	0.0631	0.0892	0.0892	0.0892
      7.2	0.0260	0.0367	0.0518	0.0732	0.1034	0.1034	0.1034
      7.3	0.0297	0.0420	0.0593	0.0837	0.1183	0.1183	0.1183
      7.4	0.0336	0.0474	0.0669	0.0946	0.1336	0.1336	0.1336
      7.5	0.0374	0.0528	0.0746	0.1054	0.1489	0.1489	0.1489
      7.6	0.0411	0.0581	0.0821	0.1160	0.1638	0.1638	0.1638
      7.7	0.0447	0.0631	0.0892	0.1260	0.1780	0.1780	0.1780
      7.8	0.0480	0.0678	0.0958	0.1353	0.1911	0.1911	0.1911
      7.9	0.0510	0.0720	0.1017	0.1437	0.2030	0.2030	0.2030
      8.0	0.0536	0.0758	0.1070	0.1512	0.2135	0.2135	0.2135
      8.1	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      8.2	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      8.3	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      8.4	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      8.5	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      8.6	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      8.7	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      8.8	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      8.9	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      9.0	0.0537	0.0758	0.1071	0.1513	0.2137	0.2137	0.2137
      ***To calculate total ammonia, divide the number in 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
      	T	=	°C

      Table 6-8
      24-Hour Average Ammonia Concentrations (Unionized Ammonia as N)***
      (mg/l) Temperature (°C)
      pH	0	5	10	15	20	25	30
      6.5	0.0005	0.0008	0.0011	0.0015	0.0015	0.0015	0.0015
      6.6	0.0007	0.0010	0.0014	0.0019	0.0019	0.0019	0.0019
      6.7	0.0009	0.0012	0.0017	0.0024	0.0024	0.0024	0.0024
      6.8	0.0011	0.0015	0.0022	0.0031	0.0031	0.0031	0.0031
      6.9	0.0014	0.0019	0.0027	0.0038	0.0038	0.0038	0.0038
      7.0	0.0017	0.0024	0.0034	0.0048	0.0048	0.0048	0.0048
      7.1	0.0022	0.0031	0.0043	0.0061	0.0061	0.0061	0.0061
      7.2	0.0027	0.0038	0.0054	0.0077	0.0077	0.0077	0.0077
      7.3	0.0034	0.0048	0.0068	0.0097	0.0097	0.0097	0.0097
      7.4	0.0043	0.0061	0.0086	0.0122	0.0122	0.0122	0.0122
      7.5	0.0054	0.0077	0.0108	0.0153	0.0153	0.0153	0.0153
      7.6	0.0068	0.0097	0.0136	0.0193	0.0193	0.0193	0.0193
      7.7	0.0086	0.0122	0.0172	0.0242	0.0242	0.0242	0.0242
      7.8	0.0092	0.0130	0.0184	0.0260	0.0260	0.0260	0.0260
      7.9	0.0098	0.0138	0.0196	0.0276	0.0276	0.0276	0.0276
      8.0	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      8.1	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      8.2	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      8.3	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      8.4	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      8.5	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      8.6	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      8.7	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      8.8	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      8.9	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      9.0	0.0103	0.0146	0.0206	0.0294	0.0294	0.0294	0.0294
      ***To calculate total ammonia, divide the number in 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
      	T	=	°C

(c) 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 applicable outside of 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. (1) Dissolved oxygen concentrations must not be less than:

   1. (A) six (6.0) milligrams per liter at any time; and
   2. (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.

2. (2) The maximum temperature rise above natural 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 must not exceed the following:

   1. (A) Seventy (70) degrees Fahrenheit (twenty-one and one-tenth (21.1) degrees Celsius) at any time.
   2. (B) Sixty-five (65) degrees Fahrenheit (eighteen and three-tenths (18.3) degrees Celsius) during spawning and imprinting periods.

(d) Bacteriological quality for recreational uses during the recreational season is as follows:

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

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

   1. (A) Evaluate waters for full body contact recreational uses.
   2. (B) Establish wastewater treatment requirements.
   3. (C) Establish effluent limits during the recreational season.

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

   1. (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.

   2. (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:

      1. (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
      2. (ii) criterion in clause (A) is met.
   3. However, a single sample is used for making beach notification and closure decisions.
4. 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.

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

   1. (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.
   2. (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 must be limited to the lowest whole number result.

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

   1. (A) The concentration of E. coli in the undiluted discharge 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.
   2. (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 must be limited to the lowest whole number result.

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

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

   1. (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).
   2. (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.
   3. (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. (2) Taste and odor producing substances, other than naturally occurring, must not interfere with the production of a finished water by conventional treatment consisting of the following:

   1. (A) Coagulation.
   2. (B) Sedimentation.
   3. (C) Filtration.
   4. (D) Disinfection.
3. (3) The concentrations of either chloride or sulfate must not exceed two hundred fifty (250) milligrams per liter unless due to naturally occurring sources.
4. (4) The concentration of dissolved solids 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. (5) Surface waters 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. (6) The:

   1. (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
   2. (B) concentration of nitrite-N must not exceed one (1) milligram per liter as a thirty (30) day average value.
7. (7) Chemical constituents in the waters must not be present at levels that prevent, after conventional treatment, meeting the drinking water standards contained in 327 IAC 8-2, due to other than natural causes.

(f) In addition to subsection (a), dissolved solids 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) The criteria to ensure surface water quality conditions necessary for agricultural use are the same as those in subsection (a).

(h) The quality of surface waters designated for limited uses under section 11(a) of this rule must, at a minimum, meet the criteria contained in subsections (a), (d), and where applicable, (f), and be aerobic at all times. However, the water must meet the criteria that are applicable to the higher use water at the point where a limited use water:

1. (1) becomes physically or chemically capable of supporting a higher use; or
2. (2) interfaces with a higher use water segment.

*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; readopted filed Oct 18, 2024, 1:57 p.m.: 20241113-IR-327230810RFA)