Page 1 of 7 ADEQ Water Div NPDES 2/9/2012 1:05 PM

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1 Page of 7 ADEQ Water Div NPDES 2/9/22 :5 PM CALCULATIONS OF ARKANSAS WATER QUALITY-BASED EFFLUENT LIMITATIONS The spreadsheet logic will function correctly when ALL yellow cells with "?" have data entered. For an Arkansas River/Stream Do not enter data in yellow cells marked "Reserved". White cells marked "Reserved" have comp (Reserved) STEP : INPUT TWO LETTER CODE FOR ECOREGION (Use Code at Right) OM FACILITY Codes & TSS for Ecoregions and Large Rivers Ouachita Mts. Eco (OM) = 2. mg/l Arkansas (Ft. Smith to Dardanelle Dam 2. mg/l tee UMETCO Ozark Highlands Eco (OH) = 2.5 mg/l Arkansas (Dardanelle Dam to Terry L&.5 mg/l NPDES No. AR4895 Boston Mts. Eco (BM) =.3 mg/l Arkansas (Terry L&D to L&D No. 5) 8.3 mg/l Outfall No.(s) Ark River Valley Eco (AV) = 3. mg/l Arkansas (L&D No. 5 to Mouth) 9. mg/l Plant Effluent Flow (MGD) 3.76 Gulf Coastal Eco (GC) = 5.5 mg/l White (Above Beaver Lake) 2.5 mg/l Plant Effluent Flow (cfs) 5.8 Delta Ecoregion (DL) = 8. mg/l White (Below Bull Shoals to Black Riv) 3.3 mg/l White (From Black River to Mouth) 8.5 mg/l RECEIVING STREAM St. Francis River 8. mg/l Ouachita (Above Caddo River) 2. mg/l Is this a large river? (see list at right)(enter "" if yes, "" if no; make entry as a number) Ouachita (Below Caddo River) 5.5 mg/l Name of Receiving Stream: Wilson Creek Red River 33. mg/l Is this a lake or reservoir? (enter '' if yes, ' ' = no; make entry as a number) Total Hardness for: (Reserved) Arkansas River = 25 mg/l Red River = 2 mg/l (Reserved) DO NOT INPUT DATA INTO CELL H22, H23 & H24...LEAVE BLANK=? Ouachita River = 28 mg/l St. Francis River = 3 mg/l (Reserved) White River = 6 mg/l (Reserved) (Reserved) (Reserved) (Reserved) (Reserved) Gulf Coastal = 3 mg/l Ouachita Mount = 3 mg/l (Reserved) (Reserved) Ozark Highlands = 48 mg/l Ark River Valley = 25 mg/l (Reserved) (Reserved) Boston Mount = 25 mg/l Delta = 8 mg/l Ecoregion TSS (mg/l) (For Large River, See List to Right) 2. Large Rivers Ecoregion Hardness (mg/l) 3. Mississippi River, Arkansas River, Red River Enter 7Q (cfs) as the Critical Flow (Reserved) (Reserved) (Reserved White (Below confluence with Black River) Long Term Ave / Harmonic Mean Flow (cfs) (Reserved (Reserved) Ouachita (Below confluence with Little Miss. River) Using Diffusers (Yes/No) no ph (Avg) 7.59 For industrial and federal facility, use the highest monthly average flow Percent (%) of Critical Flow for Chronic Criteria.67 for the past 24 months. For POTWs, use the design flow. Percent (%) of Critical Flow for Acute Criteria.33 Water Effect Ratio (WER). #VALUE! => No violation or Not Applicable Ave Monthly Limit LTA Multiplier (Ref: page 3 TSD for WQ-Based Toxics Control).55. => No EPA/ADEQ Guideline Max Daily Limit LTA Multiplier (Ref: " " " " ) 3.

2 Page 2 of 7 ADEQ Water Div NPDES 2/9/22 :5 PM Max Daily Limit LTA Multiplier for Human Health (Ref: 29 CPP; Section ).64 STEP 2: INPUT AMBIENT AND EFFLUENT DATA CALCULATE IN-STREAM WASTE CONCENTRATIONS DATA INPUT For less than 2 data points enter geometric mean concentration as micro-gram per liter ( or ppb). For 2 or more data points in set enter highest concentration as micro-gram per liter ( or ppb). Effluent value reported as "< detection level" (DL) but the DL is greater than MQL, the /2 DL is used. Effluent value reported as "< detection level" (DL) and the DL is smaller than MQL, "" is used. If a firm value is reported, even less than MQL, the reported value is used. The following formulae is used to calculate the Instream Waste Concentration () (Please refer to CPP for detail) = [(F*Qa*Cb) + (Qe**Ce)] / (F*Qa + Qe) Where: = Instream Waste Concentration F = Fraction of stream allowed for mixing Ce = Reported concentration in effluent Cb = Ambient stream concentration upstream of discharge Qe = Plant effluent flow Qb = Critical low flow of stream at discharge point expressed as the 7Q or harmonic mean flow for human health criteria Upstream Flow (Qb)= (% of 7Q) X 7Q for Chronic and Acute The following formulae convert metals reported in total form to dissolved form if criteria are in dissolved form Kp = Kpo * (TSS**a) C/Ct = / ( + Kp*TSS* ^-6) Total Metal Criteria (Ct) = Cr / (C/Ct) Total Metals Kp = Linear partition coefficient; Kpo and a can be found in table below TSS = Total suspended solids concentration found in receiving stream (or in effluent for intermittent stream) C/Ct = Fraction of metal dissolved; and Cr = Dissolved criteria value *Stream Linear Partition Coefficient (Insert "Dissolved" Conc in Column B to convert to "Total") Lake Linear Partition Coefficient Dissolved Value in Stream Kpo alpha (a) Kp C/Ct Total Value Kpo alpha (a) Kp C/Ct Total Value Cadmium Chromium(3) Copper Lead Mercury Nickel Zinc Silver *Note: Use this section to convert lab concentrations shown as "dissolved" to "total"

3 Page 3 of 7 ADEQ Water Div NPDES 2/9/22 :5 PM Dissolved Total The following formulas are used to calculate water quality criteria based on Regulation No. 2 (Act 472 of Ark 949) WQC () WQC() Cadmium Acute WER X CF X e(.28[ln(hardness)]-3.828).4 CF = [.4838*ln(hardness)] Chronic WER X CF2 X e(.7852[ln(hardness)]-3.49).43 CF2 = [.4838*ln(hardness)] Chromium Tri Acute WER X.36 X e(.89[ln(hardness)] Chronic WER X.86 X e(.89[ln(hardness)] Chromium Hex Acute WER X.982 X Chronic WER X X Copper Acute WER X.96 X e(.9422[ln(hardness)]-.464) 5.64 Chronic WER X.96 X e(.8545[ln(hardness)]-.465) 4.7 Lead Acute WER X e(.273[ln(hardness)]-.46)*cf CF3 = [.4572*ln(hardness)] Chronic WER X e(.273[ln(hardness)]-4.75)*cf3.69 Mercury Acute WER X.85 X Chronic WER X.2. Nickel Acute WER X.998 X e(.846[ln(hardness)]+3.362) Chronic WER X.997 X e(.846[ln(hardness)]+.645) Zinc Acute WER X.978 X e(.8473[ln(hardness)]+.864) Chronic WER X.986 X e(.8473[ln(hardness)]+.764) Silver Acute WER X.85 X e(.72[ln(hardness)]-6.52).46 Cyanide Acute WER X Chronic WER X Selenium Acute WER X 2 2 Chronic WER X 5 5. The following formulas are applicable to the Jet Stream Model for lakes for calculating the Dilution Factor (DF): DF = ((2.8 * D * 3.46^.5) / X) where DF is % of effluent at distance X, D is the diameter of the outfall pipe and X is aquatic life criteria--25 feet for ZID; feet for mixing zone; human health criteria 2 feet for mixing zone. DF = #VALUE! Acute #VALUE! Chronic #VALUE! Bioacc. The following formulas are used to calculate the instream waste concentration () for each pollutant: = [ (Frac X Critical Flow X Cb) + ( X Ce X Qd)] / [Frac X Critical Flow + Qd] where the critical flow is the 7Q except for lakes with the Jet Stream Model. Use EPA Statistical Factor of for less than 2 Ce data points with the Geometric Mean of the Ce's; use for more than 2 data points with the maximum Ce. = (DF X Ce) + Cb for lakes with Jet Stream Model.

4 Page 4 of 7 ADEQ Water Div NPDES 2/9/22 :5 PM 32 POLLUTANTS Arkansas Arkansas Number of EPA Chronic Acute Chronic Arkansas Data points MQL Statistical Bioacc. [Reserved] Bioacc. Factor Background Cb Effluent Ce Domestic Supply Acute METALS AND CYANIDE. Antimony Total 6. ######### 2. Arsenic Total ######### 3. Beryllium Total ######### 4 4. Cadmium Total Chromium (Tri) Chromium (hex) Copper Total Lead Total Mercury Total Nickel Total Selenium Total Silver Total.5.54 ######### 5. Thallium Total ######### 6. Zinc Total Phenols, Total ######### 7. Cyanide Total DIOXIN TCDD.E-6 VOLATILE COMPOUNDS 9. Acrolein 5 2. Acrylonitrile 2 2. Benzene 22. Bromoform 23. Carbon Tetrach Chlorobenzene 25. Chlorodibromomethane 26. Chloroethane Chloroethylvinyl ether 28. Chloroform 29. Dichlorobromomethane 3. --Dichloroethane Dichloroethane Dichlorethylene 33.,2 Dichloropropane 34.,3 Dichloropropylene 35. Ethylbenzene 37. Methyl Chloride Methyl bromide Methylene chloride Tetrachloroethan 4. Tetrachlroethylene 4. Toluene 42.,2-trans-dichloroethylen Trichloroethane Trichloroethane 45. Trichloroethylene 46. Vinyl Chloride

5 Page 5 of 7 ADEQ Water Div NPDES 2/9/22 :5 PM ACID COMPOUNDS Chlorophenol Dichlorphenol Dimethylphenol ,6-Dinitro-o-Cresol ,4-Dinitrophenol Nitrophenols Chloro-3-methylpheno Pentachlorophenol Phenol Trichlorophenol Ambient Background Effluent Domestic Supply Acute Chronic Human Health [Reserved] BASE/NEUTRAL COMPOUNDS Cb Ce 58. Acenaphthene 59. Acenapthylene 6. Anthracene 6. Benzidine Benzo(a) anthracene Benzo(a) pyrene ,4-benzoflouranthene 65. Benzo(g,h,i)perylene Benzo(k) fluoranthene Bis(2-chloroethoxy)meth 68. Bis(2-chloroethly) Ether 69. Bis(2-Chloroisopropyl) e 7. Bis(2-ethylhexyl)phthalat 7. 4-Bromophenyl phenyl e 72. Butylbenzy phthalate chloronapthalene chlorophenyl phenyl et 75. Chrysene Dibenzo(a,h)anthracene Dichlorobenzene(,2-8. 3,3' Dichlorobenzidine 5 8. Diethyl Phthalate 82. Dimethyl phthalate 83. Di-n-Butyl phthalate Dinitrotoluene Dinitrotoluene 86. Di-n-octyl phthalate 87.,2-diphenylhydrazine Fluoranthene 89. Fluorene 9. Hexachlorobenzene 5 9. Hexachlorobutadiene 92. Hexachlorocyclopentadie 93. Hexachloroethane 2 Hexachlorocyclohexane Indeno(,2,3-cd)pyrene Isophorone 96. Naphthalene 97. Nitrobenzene 98. N-nitrosodimethylamine 5 Acute Criteria Chronic Criteria Human Health Criteria

6 Page 6 of 7 ADEQ Water Div NPDES 2/9/22 :5 PM 99. N-nitrosodi-n-propylamin 2. N-nitrosodiphenylamine 2. Phenanthrene 3.,2,4-trichlorobenzene PESTICIDES 4. Aldrin Alpha-BHC.5 6. Beta-BHC.5 7. Gamma-BHC.5 8. Delta-BHC.5 9. Chlordane ,4'-DDT.2.. 4,4'-DDE. 2. 4,4'-DDD. 3. Dieldrin Alpha-endosulfan Beta-endosulfan Endosulfan sulfate. 7. Endrin Endrin aldehyde. 9. Heptachlor Heptachlor epoxide. 2. PCB PCB PCB PCB PCB PCB PCB Toxaphene Chlorpyrifos

7 Page 7 of 7 ADEQ Water Div NPDES 2/9/22 :5 PM STEP 3: APPLICABLE WATER QUALITY-BASED LIMITS Daily Maximum Monthly Average Daily Maximum Monthly Average A D E Q H U M A N H E A L T H C R I T E R I A Daily Monthly Daily Monthly Maximum Average Maximum Average POLLUTANTS Ib/day lb/day Ib/day lb/day Cadmium Total Zinc Total