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COLORADO DEPARTMENT OF PUBL/C HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale-Page 5, Permit No. CO-0032638 <br />Flow, Effluent, MGD <br />TSS, mg/[ <br />pH, s. u. <br />Oil and Grease, mg/1 <br />TDS, mg/[ <br />2.6/Report a <br />30/45 b <br />6.5-9.0 b <br />/Oc <br />Report/Report d <br />Design Capacity <br />Stale Effluent Regulations <br />Water Quality Standards <br />State Effluent Regulations <br />Salinity Regulations <br />WET, Chronic <br />Statistical Difference and <br />IC25>IWC c <br />State Permit Regulations <br />Iron, TR, ug/I 960/Report d Non-Impact Limitation <br />Manganese, PD, ugR Report/Report d Non-Impact Limitation <br />Settleable Solids, ml/l * Report/0. S d Federal Effluent Limitations Guidelines <br />n 30-day rtverage /daily maximum <br />b Minimuno-Macimum <br />c Deily Maximum <br />d 30-dny nvernge/dnily mrtximum <br />This pnrrtmeler is n primrtry limimtion and may be exempted under certain conditions. See Part LA.2. of the permit, Burden of Proof Requirements <br />- Effluent Limitations for OutfaH MON2 <br />Arsenic, Total, ugR ReporUReport d Water Quality Standards <br />Cadmium, PD, ug/l Report/Report d Water Quality Standards <br />Chromium, Tri, Dis, ugR Report/Report d Water Quality Standards <br />Chromium, Hex, Dis, ug/1 Report/Report d Water Quality Standards <br />Copper, PD, ug/l Report/Report d Water Quality Standards <br />Lead, PD, ugR Report/Report d Water Quality Standards <br />Mercury, Total, ug/1 Report/Report d Water Quality Standards <br />Nickel, PD, ug/1 Report/Report d Water Quality Standards <br />Selenium, PD, ug/1 Report/Report d Water Quality Standards <br />Silver, PD, ug/l Report/Repart d Water Quality Standards <br />Zinc, PQ ug/I Report/Report d Water Quality Standards <br />d 30-dny averrtge/dnily maximum <br />2. Discussion of Effluent Limitations <br />a. ~licable Federal Effluent Guidelines and Standards: The federal guidelines dhat apply to this type ofjacilit}+are <br />found under 40 CFR 434, titled Coal Mining Point Source Category, Subparts E and H. The limitations that apply <br />are: <br />• This parameter subject to Burden ojProojReguirements <br />Alternate Limitation Burden of Proof Requirements: In conformance with 40 CFR 434.63, the permittee has the <br />burden ofproofwhen requesting relieffrom settleable solids limitations, as appropriate. Relief shall be granted <br />pH, s. u. (minimum -maximum) 6.0 - 9.0 <br />Settleable Solids, ml/1* N/A 0.5 <br />