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COLORADO DEPARTMENT OF PUB!/C HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale -Page 3, Permit No. CO-0032638 <br />Table V-1-- <br />004A <br />mgd <br />Flow 57 0.17/0.003/1.67 0.27/0.003/2.24 Report 0 <br />, <br />pH (su) 23 7.7/ti.9//8.54 8.2/7.32/9.16 6.5-9.0 0 <br />Tot fug/I) <br />Hg 57 <0.2/<0.2/<0.2 <0.2/<0.2/<0.2 0.04/NA 0 <br />, <br />Oil and Grease (mg/1) 57 NV/NV/NV NA//0 0 <br />TDS (mg/1) !8 4595/3670/5350 Report 0 <br />Settleable Solids (mlA) 56 0.0018/0/0.1 NA/0.5 0 <br />TDS (ton/day) NA NA/NA/NA 3.26 1 ton/day Exceeds <br />WET, Chronic <br />Ceriodaphnia, Lethality, IC25 <br />14 <br />100/L00/100 <br />Report <br />NA <br />Ceriodaphnia, Lethality, Stat dill 14 /00/100/100 28.60% NA <br />Ceriodaphnia, Toxicity, IC25 14 67.!/6.4/!00 Report NA <br />Ceriodaphnia, Toxicity, Stat diJf !4 81.3/0.1/100 Report NA <br />Lethality, IC25 <br />Fathead Minnows I4 80.//10.1/100 Report NA <br />, <br />Lethalit, Stat diff <br />Fathead Minnows l4 80.4//2.5/[00 28.60% 2 <br />, <br />Toxicity, /C25 <br />Fathead Minnows /4 92.8/42.5/100 Report NA <br />, <br />Fathead Minnows Toxicity Stat diff l4 96.4/50/100 Report NA <br />Tabte V-2 -Summa o ~DMR Uata or vut au vviy <br />`Na. of Reported Average' Reported Maximum Previous' Number i <br />Parameter Reporting Concentrations Concentrations Avg/Max. Limet <br />' ~ Pet'iods Avg/Mirt/Max _ ; Avg/M[n%Max : Permtt Lrmrt <br />.. ~ Excursrons,,,_ <br />Flow <br />mgd 68 0.47/0.027/4.634 0.82/0.027/7.286 Report 0 <br />, <br />pH(su) 27 7.8/7.34/8.26 8.1/7.73/8.71 6.5-9.0 0 <br />Tot fug/1) <br />Hg 68 <0.2/<0.2/<0.2 <0.2/<0.2/<0.2 0.04/NA 0 <br />, <br />Oil and Grease (mg/!) 68 NV/NV/NV NA/10 0 <br />TDS (mg/]) 2/ 3601/2470/4400 Report 0 <br />Settleable Solids (ml/l) 23 0.0!7/0/0.2 NA/0.5 0 <br />TDS (ton/day) NA 7.05 1 ton/day Exceeds <br />WET, Chronic <br />Ceriodaphnia, Lethality, IC25 <br />!4 <br />96.9/68.8/100 <br />Report <br />NA <br />Ceriodaphnia, Lethality, Stnt dill 14 /00/100/100 28.60% 0 <br />Ceriodaphnia, Toxicity, IC25 14 63/5.7/!00 Report NA <br />Ceriodaphnia, Toxicity, Stat diff 14 78.8/!2.5/100 Report NA <br />Lethality, 1C25 <br />Fathead Minnows 14 86.1/11.4/!00 Report NA <br />, <br />Lethalit, Stat diff <br />Fathead Minnows /4 90.2/12.5/100 28.60% / <br />, <br />Toxicity, /C25 <br />Fathead Minnows I4 91.3/4/.5/100 Report NA <br />, <br />Fathead Minnows Toxicity Stat dtfj 14 100/!00/100 Report NA <br />2. State Samoline: There are no state sampling results available for this facility. <br />B. Compliance With Terms and Conditions of Previous Permit <br />I. Effluent Limitafions: The facility has had exceedances of the WET Limitations at both outfalls, all of which occurred in <br />2004. Documentation was submitted showing [hat the WET failures were due to TDS. As shown in Tables V-1 and V-2, <br />the facility is also in exceedance of the allowed tons per day discharge of total dissolved solids. The total amount of TDS <br />discharged between the hvo outfalls is over 10 tons per day. The "Colorado River Salinity Standards ", Regulation No. <br />39, sets the amount of TDS discharge at 1 ton per day or 365 tons per year, or 500 mg/1. However, in 1996 treatment for <br />TDS was determined to be economically unfeasible <br />