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COLORADO DEPARTMEl1I' OF IiEAL7H, Water Quality Contra[ Division Rationale -Page 12, Permit .No. CO-0034142 Table VI-2 - Efjlueat Limitations (Ort(~alls 003, 022, and 01A) n : : :::::::::.:::::.:: :.:::Rationale ..:::: . . Flow, MGD 4.06 Design Capacity for all three outfalLs 7SS, mg/l 3S'/70" BPT Oil and Grease, mgR !0° State Effluent Regulations pN, s. u. 6.5 - 9.0` Water Quality Standards '', TDS, mg/l Monitor Only Salinity Regulations WET, Chronic (Outfall 003 Only) Untr112/31/96 Report State Permit Regulations As of 01/01/97 Statistical Difference or Stare Permit Regulations WET, Acute (Outfalls 022, 024J Until 12/31/96 Report State Permit Regulations As of O!/01 /97 LC 50 > 100% State Permit Regulations Iron (PDJ, mg/l 0.3" Water Quality Standards Zinc (IR), mg/I 0.23'/0.4 Previous Permit Limits ° 30day average ° Daily Maximum ` Minimum-Maximum ° Unacceptable levels of acute tonicity at Outfalis 003, 022, and 024 are discussed in Section VI.A.3.f ojthis rationale. ` For Outfall 024, the pH linut of 6. S s. u. - 9.0 s. u. is based on inter quality (6.5 s. u.J and federal standards (9.0 s. u. J. Table VI-3 - Ejfluetu Limit~rtions (Ou1jaU 023) l?ammeter :. ' ..::. :...: Limitdtion::.: Rationale . Flaw, MGD 0.012 Design Capacity TSS, mg/! (!bs/day) 75 (7. S)/ State Effluent Regulations 110 (11.0]° Oil and Grease, mg/1 !0" State Effluent Regulations pN, s. u. 6.5 - 9.0` Water Quality Standards/,SPT Total Residual Chlorine, mg/1 0.5" State Effluent Regulations Fecal Colifornu, H//OOmI 2000' Water Quality Standards TDS, mg/l Manitar Only Sa/miry Regulations BODS, mg/1 (lbs/dayJ 30 (3.OJ State EQluent Regulations as (4.5J' ° 30-day average/7-day average " Daily Maximum ` Minimum-Maximum "- Unacceptable leveir of acute toxicity at Outfall 023 is discussed in Section VI.A.3.jojthis rationale.