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COLORADO DEPARTMENT OF HEALTH, Water Qunliry Control Division <br />Rationale -Page 8, Permit No. CO-0032638 <br />Table VI-3 -- EjJluent Limitations jot Outjall 006 <br />Parameter Lirriilatida Rationale . . <br />Flow, MGD 2.45 Design Capacity <br />TSS, mg/P 35/70 b/ Federal BAT <br />Total /non, mg/P <br />August -February 3.5/7.0 b/ Federal BAT <br />Torn! Recoverable Iran, mg/P <br />March -July 1.7 a/ Wafer Quality Starufardt <br />Tonal Recoverable Manganese, mg/P <br />August -February <br />through February 28, 1995 Report Interim Monitoring <br />begimring March 1, 7995 5.6 a/ Water Quality Staruiards <br />March -July <br />through Februnry 28, 7995 Report Interim Monitoring <br />beginning Mnrch 1, 1995 1.7 a/ Water Quality Standards <br />Poretttinlly Dissolved Manganese, mg/P <br />August -Februnry <br />through Februnry 28, 1995 Report luterim Monitoring <br />beginning March 1, 1995 0.3 n/ Water Quality Standards <br />Mnrch -July <br />through Februnry 28, 1995 Report Interim Monitoring <br />beginning Mnrch 1, 1995 0.08 a/ Water Qunliry Standards <br />Torn! Recovernble Mercury, rng/P <br />August -Februnry <br />through Februnry 28, 1995 Report Interim Monitoring <br />beginning Mnrch 1, 1995 0.00006 a/ Water Quality Standards <br />Mnrch -July <br />d~rough Februnry 28, 1995 Report Interim Monitoring <br />beginning March 1, 1995 0.00002 a/ Water Quality Stnndnrds <br />Suljnle, mg/P <br />August -Februnry <br />through February 28, 1995 Report Interim Monitoring <br />beginning Mnrch 1, 1995 1404 n/ Water Qunliry Stnndnrels <br />Mnrch -July <br />through February 28, /995 Report Iruerim Monitoring <br />beginning March 1, 1995 422 n/ Water Qunliry Srnndnrds <br />Oil and Greose, mg/f 10 c/ Smte E-Qluent Regulations <br />pH, s. rr. 6.5-9.0 d/ Water Qunliry Stnrulnrds <br />TDS, mg/P Report Snlinity Regulations <br />IVET, Chronic Lethnliry Store Permit Regulations <br />through 12/3//96 Report <br />begiruriug 01/01/97 StntisticalDifference c/ <br />a/ 3arlay average <br />L/ 30-dny nverngdrimly nmrirmun <br />_d Onily A1m'imnni <br />rt/ Afininuon Alnomum <br />2. Cnlculntion a(Wnter Ounliry-Bated ERluent Limitations: Amass balance eguntiou war used to determine the <br />effluent concentrations thnt x~ould not vio[nte the allownbfe in-stream concentrations defined by the wnler qunliry <br />srmrdnrds (except in d7e ease ojpH, where the [units are set directly from stream stnndnrds or effluent regulnrions <br />without using n moss balance npprondtJ. The mass balance equation follows. <br />tilt = AItQs - MtQt <br />Qz <br />