1. (a) Surface Water Quality Criteria

   1. (1) Surface Waters shall meet the criteria listed in Table 1 to support the designated uses identified for their particular classification. Table 1 - Surface Water Criteria by ClassificationParameterClass AAClass AClass BClass SAClass SBAestheticsUniformly excellent. Uniformly excellent.Good to excellent.Uniformly excellent.Good to excellent.Dissolved OxygenNot less than 5 mg/l at any time.Not less than 5 mg/l at any time.Not less than 5 mg/l at any time.Acute: Not less than 3.0 mg/l. Chronic: Not less than 4.8 mg/l with cumulative periods of dissolved oxygen in the 3.0 – 4.8 mg/l range as detailed in Note 1 to this table. Acute: Not less than 3.0 mg/l. Chronic: Not less than 4.8 mg/l with cumulative periods of dissolved oxygen in the 3.0 – 4.8 mg/l range as detailed in Note 1 to this table. Sludge deposits-solid refuse-floating solids-oils and grease-scumNone other than of natural origin.None other than of natural origin.None except for small amounts that may result from the discharge from a permitted waste treatment facility and none exceeding levels necessary to protect and maintain all designated uses. None other than of natural origin.None except for small amounts that may result from the discharge from a grease waste treatment facility providing appropriate treatment and none exceeding levels necessary to protect and maintain all designated uses. ColorNone other than of natural originNone other than of natural origin.None which causes visible discoloration of the surface water outside of any designated zone of influence. None other than of natural origin.None resulting in obvious discoloration of the surface water outside of any designated zone of influence. Suspended and settleable solidsNone in concentrations or combinations which would impair designated uses; none aesthetically objectionable; none which would significantly alter the physical or chemical composition of the bottom; none which would adversely impact aquatic organisms living in or on the bottom substrate. None in concentrations or combinations which would impair designated uses; none aesthetically objectionable; none which would significantly alter the physical or chemical composition of the bottom; none which would adversely impact aquatic organisms living in or on the bottom substrate. None in concentrations or combinations which would impair the most sensitive designated use; none aesthetically objectionable; none which would significantly alter the physical or chemical composition of the bottom; and none which would adversely impact aquatic organisms living in or on the bottom sediments; shall not exceed 10 mg/l over ambient concentrations. None other than of natural origin.None in concentrations or combinations which would impair the designated uses; none aesthetically objectionable; none which would significantly alter the physical or chemical composition of bottom sediments; none which would adversely impact organisms living in or on the bottom sediment. Silt or sand depositsNone other than of natural origin except as may result from normal agricultural, road maintenance, construction activity or dredging activity or discharge of dredged or fill materials provided all reasonable controls or Best Management Practices are used in such activities and all designated uses are protected and maintained. None other than of natural origin except as may result from normal agricultural, road maintenance, construction activity, dredging activity or the discharge of dredged or fill materials provided all reasonable controls or Best Management Practices are used in such activities and all designated uses are protected and maintained. None other than of natural origin except as may result from normal agricultural, road maintenance, construction activity, dredging activity or discharge of dredged or fill materials provided all reasonable controls or Best Management Practices are used in such activities and all designated uses are protected and maintained. None other than of natural origin except as may result from normal agricultural, road maintenance, construction activity, dredging activity or the discharge of dredged or fill materials provided all reasonable controls or Best Management Practices are used in such activities and all designated uses are protected and maintained. None other than of natural origin except as may result from normal agricultural, road maintenance, construction activity, dredging activity or discharge of dredged or fill materials provided all reasonable controls or Best Management Practices are used in such activities and all designated uses are protected and maintained. TurbidityShall not exceed 5 NTU over ambient levels and none exceeding levels necessary to protect and maintain all designated uses. All reasonable controls or Best Management Practices are to be used to control turbidity. Shall not exceed 5 NTU over ambient levels and none exceeding levels necessary to protect and maintain all designated uses. All reasonable controls or Best Management Practices are to be used to control turbidity. Shall not exceed 5 NTU over ambient levels and none exceeding levels necessary to protect and maintain all designated uses. All reasonable controls or Best Management Practices are to be used to control turbidity. None other than of natural origin except as may result from normal agricultural, road maintenance, or construction activity, dredging activity or discharge of dredged or fill materials provided all reasonable controls and Best Management Practices are used to control turbidity and none exceeding levels necessary to protect and maintain all designated uses. None other than of natural origin except as may result from normal agricultural, road maintenance, or construction activity, or discharge from a waste treatment facility providing appropriate treatment, dredging activity or discharge of dredged or fill materials provided all reasonable controls and Best Management Practices are used to control turbidity and none exceeding levels necessary to protect and maintain all designated uses. Indicator bacteriaSee Table 2A of this section.See Table 2A of this section.See Table 2A of this section.See Table 2B of this section.See Table 2B of this section.Taste and OdorNone other than of natural origin.None other than of natural origin.None that would impair any uses specifically assigned to this Class.As naturally occurs.As naturally occurs. None that would impair any uses specifically assigned to this Class. pHAs naturally occurs.As naturally occurs.6.5 – 8.06.8 – 8.56.8 – 8.5Allowable Temperature IncreaseThere shall be no changes from natural conditions that would impair any existing or designated uses assigned to this Class and in no case exceed 85^o F, or in any case raise the temperature of surface water more than 4^o F. There shall be no changes from natural conditions that would impair any existing or designated uses assigned to this Class and, in no case exceed 85^o F, or in any case raise the temperature of surface water more than 4^o F. There shall be no changes from natural conditions that would impair any existing or designated uses assigned to this Class and, in no case exceed 85^o F, or in any case raise the temperature of surface water more than 4^o F. There shall be no changes from natural conditions that would impair any existing or designated uses assigned to this Class and, in no case exceed 83^o F, or in any case raise the temperature of the receiving water more than 4 ^o F. During the period including July, August and September, the temperature of the receiving water shall not be raised more than 1.5^o F unless it can be shown that spawning and growth of indigenous organism will not be significantly affected. The allowable temperature increase resulting from discharges in the estuarine segments of the Housatonic, Connecticut and Thames Rivers shall be consistent with the criteria for the non-tidal segments. There shall be no changes from natural conditions that would impair any existing or designated uses assigned to this Class and, in no case exceed 83^o F, or in any case raise the temperature of the receiving water more than 4^o F. During the period including July, August and September, the temperature of the receiving water shall not be raised more than 1.5 ^o F unless it can be shown that spawning and growth of indigenous organisms will not be significantly affected. The allowable temperature increase resulting from discharges in the estuarine segments of the Housatonic, Connecticut and Thames Rivers shall be consistent with the criteria for the non-tidal segments. Chemical constituentsNone in concentrations or combinations which would be harmful to designated uses. Refer to Table 3 of this section and sections 22a-426-4(a)(5); 22a-426-4(a)(9); 22a-426-4(a)(9)(B); 22a-426-4(a)(11); 22a-426-4(l); 22a-426-4(m); 22a-426-9(a)(3); 22a-426-9(a)(4) and 22a-426-9(a)(5) of the Regulations of Connecticut State Agencies. NutrientsThe loading of nutrients, principally phosphorus and nitrogen, to any surface water body shall not exceed that which supports maintenance or attainment of designated uses. The loading of nutrients, principally phosphorus and nitrogen, to any surface water body shall not exceed that which supports maintenance or attainment of designated uses. The loading of nutrients, principally phosphorus and nitrogen, to any surface water body shall not exceed that which supports maintenance or attainment of designated uses. The loading of nutrients, principally phosphorus and nitrogen, to any surface water body shall not exceed that which supports maintenance or attainment of designated uses. The loading of nutrients, principally phosphorus and nitrogen, to any surface water body shall not exceed that which supports maintenance or attainment of designated uses SodiumNot to exceed 20 mg/l.None other than of natural origin.Biological conditionSustainable, diverse biological communities of indigenous taxa shall be present. Moderate changes, from natural conditions, in the structure of the biological communities, and minimal changes in ecosystem function may be evident; however, water quality shall be sufficient to sustain a biological condition within the range of Connecticut Biological Condition Gradient Tiers 1-4 as assessed along a 6 tier stressor gradient of Biological Condition Gradient (See section 22a-426-5 of the Regulations of Connecticut State Agencies). Sustainable, diverse biological communities of indigenous taxa shall be present. Moderate changes, from natural conditions, in the structure of the biological communities, and minimal changes in ecosystem function may be evident; however, water quality shall be sufficient to sustain a biological condition within the range of Connecticut Biological Condition Gradient Tiers 1-4 as assessed along a 6 tier stressor gradient of Biological Condition Gradient (See section 22a-426-5 of the Regulations of Connecticut State Agencies). Sustainable, diverse biological communities of indigenous taxa shall be present. Moderate changes, from natural conditions, in the structure of the biological communities, and minimal changes in ecosystem function may be evident; however, water quality shall be sufficient to sustain a biological condition within the range of Connecticut Biological Condition Gradient Tiers 1-4 as assessed along a 6 tier stressor gradient of Biological Condition Gradient (See section 22a-426-5 of the Regulations of Connecticut State Agencies). Sustainable, diverse biological communities of indigenous taxa shall be present. Moderate changes, from natural conditions, in the structure of the biological communities, and minimal changes in ecosystem function may be evident; however, water quality shall be sufficient to sustain a healthy, diverse biological community Sustainable, diverse biological communities of indigenous taxa shall be present. Moderate changes, from natural conditions, in the structure of the biological communities, and minimal changes in ecosystem function may be evident; however, water quality shall be sufficient to sustain a healthy, diverse biological community Note 1Cumulative Dissolved Oxygen exposure parameters: Dissolved Oxygen conditions in the area affected do not readily lend themselves to a single numeric criterion. Aquatic organisms are harmed based on a combination of minimum oxygen concentration and duration of the low Dissolved Oxygen excursion. The department established exposure allowances based upon EPA research and data, for 0.5 mg/l and 0.3 mg/l increment ranges. (See Table A in this note.) Given the environmental variability, the department has used a minimum Dissolved Oxygen criterion of 3.0 mg/l with an exposure allowance of no more than 2 days. Table A. Dissolved Oxygen Chronic Cumulative Exposure Criteria for incremental ranges (0.5 mg/l and 0.3 mg/l) applicable to Class SA and SB waters. Dissolved Oxygen Range (mg/l)No. of Days Allowed<4.8≥ 4.530<4.5≥ 4.014<4.0≥ 3.57<3.5≥ 3.02Because marine systems are variable, Dissolved Oxygen levels are unlikely to remain within one of the four incremental ranges presented in Table A. Typically, Dissolved Oxygen conditions would fall through a range to a minimum and then begin to rebound depending on weather and stratification conditions. To account for this, the number of days within each incremental Dissolved Oxygen range is pro-rated, as follows: A decimal fraction is calculated for each range, e.g., 10.5 days in the 4.5 - 4.8 mg/l range would produce a decimal fraction of 0.35 (0.35 = 10.5 days/ 30 days). As long as the sum of those fractions calculated for each range is less than 1.0, resource protection goals are maintained for larval recruitment. In cases where data collection yields continuous Dissolved Oxygen readings or more frequent sampling results, the data can be interpreted using a 0.1 mg/l interval range. The number of allowable days is determined using the following method: DOi = 13.0 / (2.80 + 1.84e^-0.10ti ) where:DOi = allowable Dissolved Oxygen concentration (mg/l) t_i = exposure interval duration in days i = exposure intervalHowever, since most sampling programs do not result in frequent readings, a greater interval (presented in Table A) is recommended. Use of a larger interval results in a larger sum of fractions and is subsequently a more conservative measure of consistency with the Connecticut Water Quality Standards.

   2. (2) Indicator bacteria are used to detect the presence of contamination by human or animal wastes. Tables 2A and 2B below provide the criteria for indicator bacteria. Due to the inherent uncertainty involved in sampling and analytically determining bacteria levels, exceedances of water quality criteria for indicator bacteria does not always indicate a water quality problem and therefore should be investigated by means of a sanitary survey or other appropriate means to determine sources of elevated indicator bacteria levels. Table 2A – Indicator Bacteria – FreshwaterDesignated UseIndicatorCriteria by classificationDrinking water supply

      1. (1)Total ColiformAAABSASBMonthly moving average less than 100/100 mlSingle sample maximum 500/100 mlRecreation
      2. (2)(3) – Designated swimming
      3. (4)Escherichia coliGeometric mean less than 126/100 mlSingle sample maximum 235/100 mlRecreation
      4. (2)(3) – Non Designated Swimming
      5. (5)Escherichia coliGeometric mean less than 126/100 mlSingle sample maximum 410/100 mlRecreation
      6. (2)(3) – All other usesEscherichia coliGeometric mean less than 126/100 mlSingle sample maximum 576/100 mlTable 2B – Indicator Bacteria - SaltwaterDesignated UseIndicatorCriteria by classificationAAABSASBShell fishing
      7. (6) – Direct ConsumptionFecal coliformGeometric mean less than 14/100 ml90% of samples less than 31/100 mlShell fishing
      8. (6) – Indirect consumptionFecal coliformGeometric mean less than 88/100 ml90% of samples less than 260/100 mlRecreation - Designated swimming

      9. (4)EnterococciGeometric mean less than 35/100mlSingle sample maximum 104/100 mlRecreation – All other usesEnterococciGeometric mean less than 35/100 mlSingle sample maximum 500/100 mlNotes for Tables 2A and 2B

         1. (1) Criteria applies only at the drinking water supply intake structure.
         2. (2) Criteria for the protection of recreational uses in Class B waters do not apply when disinfection of sewage treatment plant effluents is not required consistent with section 22a-426-4(a)(9)(E) of the Regulations of Connecticut State Agencies.
         3. (3) See section 22a-426-9(a)(2) of the Regulations of Connecticut State Agencies.
         4. (4) Procedures for monitoring and closure of bathing areas by state and local health authorities are specified in: Guidelines for Monitoring Bathing Waters and Closure Protocol, adopted jointly by the Department of Environmental Protection and the Department of Public Health, May 1989, revised April 2003 and updated December 2008.
         5. (5) Includes areas otherwise suitable for swimming but which have not been designated by state or local authorities as bathing areas, waters which support tubing, water skiing, or other recreational activities where full body contact is likely.
         6. (6) Criteria are based on utilizing the mTec method as specified in the U.S. Food and Drug Administration National Shellfish Sanitation Program-Model Ordinance (NSSP-MO) document Guide for the Control of Molluscan Shellfish 2007.
         7. (3) Discharges to surface waters shall meet the criteria listed for chemical constituents in Table 3 of this section to ensure the particular surface waters support the uses identified for their particular classification and to assure that such discharges do not cause acute or chronic toxicity to freshwater and marine aquatic life, impair the biological integrity of freshwater and marine ecosystems, or create an unacceptable risk to human health.

         8. (4) The Commissioner may amend the numeric criteria for the chemical constituents listed in Table 3 of this section in accordance with the provisions of Chapter 54 of the Connecticut General Statutes and the notice procedures specified in section 22a 426 of the Connecticut General Statutes on his or her own initiative, or upon request of any person or municipality that site-specific water quality criteria be adopted or amended, provided such request is supported by sound scientific and technical evidence demonstrating the following:

            1. (A) Conditions at the specific site differ significantly from those used in establishing the statewide criteria;
            2. (B) The proposed site-specific criteria are sufficiently stringent to protect all existing and designated uses of the water body; and (C) The proposed site-specific criteria are derived in a manner consistent with sound scientific and technical principles, giving consideration to all applicable federal guidance.
         9. (5) The Commissioner may adopt or amend criteria for any surface water or class of water, in accordance with the provisions of Chapter 54 of the Connecticut General Statutes and the notice procedures specified in section 22a-426 of the Connecticut General Statutes and in subparagraphs (A), (B), and (C) of subdivision (4) of this subsection, provided such change is supported by sound scientific and technical evidence, and existing and designated uses are fully protected. Table 3 NUMERICAL WATER QUALITY CRITERIA FOR CHEMICAL CONSTITUENTSNumerical Water Quality Criteria for Chemical Constituents (ug/L)¹Aquatic Life Criteria
         10. (2)(3)Human health CriteriaFreshwater:Class AA, A & BSaltwaterClass SA & SBClass B, SA & SB WatersClass AA & A WatersChemical ConstituentsCASRNAcute⁴Chronic⁵Acute⁴Chronic⁵Consumption of FishConsumption of Water & FishHealth Designation⁶Inorganics⁷Antimony74403606405.6TTArsenic (total)744038234015069360.0210.011ABeryllium74404170.130.0077TTCadmium74404391.00.125408.810,7695TTChromium (hex)1854029916111,100502,019100TTChromium (tri)16065831323421,009,615100TTCopper744050814.3 ⁸4.8 ⁹4.83.11,300TTCopper (site-specific) ¹⁰744050825.718.11,300TTCyanide (Total)57125225.2011140140TTLead7439921301.22108.115TTMercury (Total)74399761.40.771.80.940.0510.050TT-HBNickel7440020260.528.9748.24,600610TTSelenium (Total)7782492205290714,20050TTSilver74402241.021.9107,692175TTThallium74402800.470.24TTZinc74406666565908126,0007,400TTVolatilesAcrolein1070283396TTAcrylonitrile1071310.250.051CBenzene71432511.2ABromoform752521404.3CCarbon Tetrachloride562351.60.23CChlorobenzene1089071,600100TTChlorodibromomethane124481130.40CChloroethane750032-Chloroethylvinyl Ether110758Chloroform676634705.7CDichlorobromomethane75274170.55C1,1-Dichloroethane753431,2-Dichloroethane107062370.38C1,1-Dichloroethylene753543.20.057C1,2T-Dichloroethylene15660510,000100TT1,2-Dichloropropane78875150.50TT1,3-Dichloropropylene542756210.34TTEthylbenzene1004142,100530TTMethyl Bromide748391,50047TTMethyl Chloride748734705.7TTMethylene Chloride750925904.6C1,1,2,2-Tetrachloroethane793454.00.17C-HBTetrachloroethylene1271843.30.69TTToluene10888315,0001,000TT1,1,1-Trichloroethane715561,1,2-Trichloroethane79005160.59CTrichloroethlyene79016302.5CVinyl Chloride750142.40.025CGC/MS: Acid Compounds2-Chlorophenol9557815081TT2,4-Dichlorophenol12083229077TT2,4-Dimethylphenol105679850380TT3-Methyl-4-chlorophenol595072-Methyl-4,6-Dinitrophenol53452128013TT2,4-Dinitrophenol512855,30069TT2-Nitrophenol887554-Nitrophenol100027Pentachlorophenol878651915137.93.00.27C-HBPhenol108952860,00010,000TT2,4,6-Trichlorophenol880622.41.4C-HBBase Neutral CompoundsAcenaphthene833296.12.7TT-HBAcenapthylene20896849.24.37C-HBAnthracene1201274.920.44C-HBBenzidene928750.000200.000086ABenzo(a)anthracene565530.0180.0038C-HBBenzo(a)pyrene503280.0180.0038C-HBBenzo(b)fluoranthene2059920.0180.0038C-HBBenzo(ghi)perylene1912424.920.44C-HBBenzo(k)fluoranthene2070890.0180.0038C-HBBis(2-chloroethoxy)Methane111911Bis(2-Chloroethyl)Ether1114440.530.030CBis(2-Chloroisopropyl)Ether10860165,0001,400TTBis(2-Ethylhexyl)Phthalate1178172.21.2C-HB4-Bromophenylether101553Butyl Benzyl Phthalate856871,9001,500TT-HB2-Chloronapthylene915871,6001,000TT-HB4-Chlorophenylphenylether7005723Chrysene2180190.0180.0038C-HBDibenzo(a,h)anthracene537030.0100.0009C-HB1,2-Dichlorobenzene955011,300420TT-HB1,3-Dichlorobenzene541731960320TT-HB1,4-Dichlorobenzene10646719063TT-HB3,3’-Dibenzidenes919410.0280.021C-HBDiethyl Phthalate8466244,00017,000TTDimethyl Phthalate1311131,100,000270,000TTDi-n-butyl Phthlate847424,5002,000TT-HBDi-n-octyl Phthalate ester1178402,4-Dinitrotoluene1211423.40.11C2,6-Dinitrotoluene606202Di-n-ocytyl phthalate1178401,2-Diphenylhydrazine1226670.200.036CFluoranthene2064401.281.01C-HBFluorene8673749.24.37C-HBHexachlorobenzene1187410.000290.00028C-HBHexachlorobutadiene87683180.44C-HBHexachlorocyclopentadiene774741,10040TT-HBHexachloroethane677213.31.4C-HBIndeno (1,2,3-cd) pyrene1933950.0180.0038C-HBIsophorone7859196035TTNapthalene9120320,513677TTNitrobenzene9895369017TTN-Nitrosodimethylamine6275930.00069CN-Nitrosodi-N-propylamine6216470.510.005CN-Nitrosodiphenylamine863066.03.3CPhenanthrene8501849.174.37C-HBPyrene12900049.174.37C-HB1,2,4-Trichlorobenzene1208217035TTPesticidesAldrin3090021.500.650.000050.000049C-HBChlordane577491.200.00430.0450.0040.000810.00080C-HBDDT502930.55¹¹0.001¹¹0.065¹¹0.001¹¹0.000220.00022C-HBDDD725480.000310.00031C-HBDDE725590.000220.00022C-HBDieldrin605710.240.0560.3550.00190.0000540.000052CEndosulfan Alpha9599880.11¹²0.056¹²0.017¹²0.0087¹²8962TTEndosulfan Beta332136590.11¹²0.056¹²0.017¹²0.0087¹²8962TTEndosulfan Sulfate10310788962TTEndrin722080.0860.0360.01850.00230.0600.059TTEndrin Aldehyde74219340.300.29TTHeptachlor764480.260.00380.02650.00360.0000790.000079CHetachlor epoxide10245730.260.00380.02650.00360.0000390.000039CHexachlorocyclohexane alpha3198460.00490.0026C-HBHexachlorocyclohexane beta3198570.0170.0091C-HBHexachlorocyclohexane delta319868Hexachlorocyclohexane gamma (Lindane)588990.950.080.0630.019TT-HBPolychlorinated Biphenyls¹³0.0140.030.0000640.000064C-HB2,3,7,8-TCDD (Dioxin)17460160.00000000510.000000005C-HBToxaphene80013520.730.00020.210.00020.000280.00028C-HBOther SusbstancesAluminum742990575087Ammonia7664417***233 ¹⁵35 ¹⁵Asbestos13322147 Million fibers per literAChlorine77825051911137.5Chloride16887006860,000230,000*See Table Note 14-A**See Table Notes 14B & 14CTable 3 - Notes:1. The minimum data necessary to determine consistency with Connecticut Water Quality Standards shall be subject to the Commissioner's discretion and may not be limited to or include chemical analysis results for all of the constituents listed in Table 3. 2. Aquatic life criteria for freshwater may be used for saltwater if criteria for saltwater is unavailable. 3. For brackish waters, use the more restrictive of the aquatic life criteria for freshwater and for saltwater. 4. Biological integrity is impaired by an exposure of one hour or longer to a concentration which exceeds the acute criteria more frequently than once every three years on average. 5. Biological integrity is impaired when the four-day average concentration exceeds the chronic criteria more frequently than once every three years on average. 6. The commissioner shall consider the following human health designations in allocating zones of influence for discharges: A: Class A carcinogen (known human carcinogen)TT: Threshold Toxicant, not carcinogenicC: Carcinogenic (probable or possible carcinogen)HB: High potential to bioaccumulate or bioconcentrate7. Criteria apply to the dissolved fraction of ambient waters unless otherwise noted.8. Biological integrity is impaired when the ambient concentration exceeds this value on more than 5% of days in any year. 9. Biological integrity is impaired when the ambient concentration exceeds this value on more than 50% of days in any year. 10. Site-specific criteria for copper apply for the following waters: Bantam River Litchfield POTW to confluence with Shepaug RiverBlackberry River Norfolk POTW to confluence with Roaring Brook North Canaan POTW to confluence with Housatonic RiverFactory Brook Salisbury POTW to mouthFive Mile River New Canaan POTW to mouthHockanum River Vernon POTW to confluence with Connecticut RiverMill Brook Plainfield Village POTW to mouthNaugatuck River Torrington POTW to confluence with Housatonic RiverNorwalk River Ridgefield Brook to BranchvillePequabuck River Plymouth POTW to confluence with Farmington RiverPootatuck River Newtown POTW to confluence with the Housatonic RiverQuinnipiac River Southington POTW to Broadway, North HavenStill River Winsted POTW to confluence with Farmington RiverStill River Limekiln Brook to confluence with Housatonic RiverWilliams Brook Ledyard POTW to mouthWillimantic River Stafford Springs POTW to Trout Management Area (Willington) Eagleville Dam to confluence with Shetucket River11. This criterion applies to DDT and its metabolites (i.e. the total concentration of DDT and its metabolites should not exceed this value). 12. This value was derived from data for endosulfan and is most appropriately applied to the sum of alpha endosulfan and beta endosulfan. 13. Criteria are applicable to total PCB’s (e.g. the sum of all congeners or all isomer or homolog or Arochor analyses). 14. Criteria for ammonia, (mg/l as N) vary in response to ambient surface water temperature (T, degrees C) and pH. Biological integrity is considered impaired when: A The one-hour average concentration of total ammonia exceeds: [0.275/(1+10^(7.204-pH))] + [39.0/(1+10^(pH-7.204))] when salmonids are present Or [0.411/(1+10^(7.204-pH))] + [58.4/(1+10^(pH-7.204))] when salmonids are absent B The four-day average concentration of total ammonia exceeds 2.5 times the value obtained from the formula in 14.C. below. C The 30-day average concentration of total ammonia exceeds:[0.0577/(1+10^(7.688-pH))] + [2.487/(1+10^(pH-7.688))] x [MIN(2.85, 1.45 x (10^{(0.028(25-T))})] when early life stages are present; or[0.0577/(1+10^(7.688-pH))] + [2.487/(1+10^(pH-7.688))] x [1.45 x (10^{(0.028(25-MAX(T,7))})] when early life stages are absent.15. Saltwater ammonia criteria are expressed as un-ionized ammonia (NH3). Equivalent total ammonia concentrations are dependent on receiving water temperature, pH, and salinity. Conversion of un-unionized ammonia concentrations to total ammonia (NH3 + NH4+) may be performed using the procedure described in “Ambient Water Quality Criteria for Ammonia (Saltwater) – 1989”, EPA 440/5-88-004.

2. (b) Ground Water Quality Criteria

   1. (1) In areas classified as GAA, GAAs, and GA:

      1. (A) dissolved oxygen, pH, and chemical constituents shall be maintained at levels as naturally occur; and (B) oils and grease, color and turbidity, taste and odor, and coliform bacteria shall not be present unless of natural origin.
   2. (2) In areas classified as GB, no specific ground water quality criteria apply except those that may be promulgated as part of the Site Remediation Regulations adopted pursuant to section 22a-133k of the Connecticut General Statutes.
   3. (3) In areas classified as GC, no quantitative criteria are specifically determined until such time as a person applies to the department under section 22a-430 of the Connecticut General Statutes to discharge leachate to ground water.

(Effective October 10, 2013)