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COLORADO DEPARTMENT OF HEALTH, Water Qua[iry Control Division <br />Rationale -Page I5, Permit No. CO-0043648 <br />Table V/-l cont'd <br />Limits for Point: <br />OOIA -Discharge From the Sediment Pond Located Befow the Valley Leach Facility to Arequa Gulch <br />Discharge Limitations <br />Effluent Parameter 30-Day Avg Daily Max. Rationale <br />Limits Based Upon Underlying Standards for Parnme[ers With Temporan~ Modi icarinns - Effective Beginning 1!1/98 <br />pH, su (mininrwn-mnxin:unq <br />Cyanide, WAD, mg/1 <br />Alutninunr, Potentially Diss, mg/l <br />Cadmium, Potentially Dissolved, mg/[ <br />/ton. Total Recoverable, rng/1 <br />Manganese, Potentially Diss, mg/l <br />Zinc, Potentially Dissolved, mg/l <br />Table VI-2 <br />N/A 6.5 - 9.0 Water Quality Standards <br />N/A 0.005 Water Qrta[iry Standards <br />0.087 0.750 Water Qunliry Standards <br />0.0034 0.019 Water Quality Standards <br />1.0 Report Water Quality Standards <br />1.0 Report Water Quality Standards <br />0.343 0.379 Water Quality Standards <br />Limits for Point: <br />002A -Discharge from the Sediment Pond Located at the Crusher Area into t/te Leach Facility Diversion Canal, Which is <br />Tributary to Arequa Gulch <br />Discharge Limitations <br />Effluent Parameter. 30.Day Avg Daily Max.. Rationale <br />Flow, MGD Report Report Discharge Assessntenr <br />pH, su (minimum-maximum) N/A 6.0 - 9.0 Federal Ejjltrent Limit Guidelines <br />TSS, mg/l <br />Oil and Grease, mg/l <br />Cadmium, Potentially Dissolved, mg/! <br />Copper, Potentially Dissolved, mg/1 <br />Lead, Potentially Dissolved, mg/l <br />Mercury, Total, mg/[ <br />Zinc, Total, mg/1 <br />20 30 Federal E,(i'luent Limit Guidelines <br />N/A 10 State Effluent Regulations <br />0.05 0.10 Federat Effluent Limit Guidelines <br />0.15 0.30 Federal Effluent Limit Guidelines <br />0.3 0.6 Federal Effluent Limit Guidelines <br />0.001 0.002 Federal Effluent Limit Guidelines <br />0.75 1.5 Federal Effluent Limit Guidelines <br />