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<br />COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 11. Permit No. CO-0021146 <br />VI. TERMS AND CONDITIONS OF PERMIT <br />A. Effluent Limitations (continued) <br />1. A_Dfllicable Federal Effluent Guidelines and Standards: There are <br />federal guidelines applicable to all outfall. The applicable <br />limitations fallow. <br />Table VI-3 -- Federal Standards <br />Parameter <br />30 Day Average Daily Maximum <br />Goncentracion Concentration <br />pH, s.u. (minimum - maximum) 6.0 - 9.0 N/A <br />To cal Suspended Solids, mg/1 35 70 <br />Total Iron, mg/1 3.5 7.0 <br />Settleable Solids, ml/1 N/A 0.5 <br />Total Suspended Sol_ds L'_mications - EPA promulgated BAT <br />regulations on November 26, 1982, but ECT (Best Convenrational <br />Pollutant Control Technology) has been reserved pending <br />finalization of EPA's BCT host methodology. Therefore, BPT <br />shall apply. The State Effluent Standard-based limitations are <br />not applicable pursuant to Section 10.1.?(3) of the Scace <br />Regulations for Effluent Limitations, which stacas chat wher. EPA <br />effluent guide Lines exist for the industry, the federal <br />limicacions shall cake precedence. <br />The following discussions anoly co outfalls 005 throush 014: <br />To cal Iron Limitation - 'he Colorado Mined Land Reclamation <br />Division and the State Engineer's Office require ponds co be <br />dewacered within 36 co /~ hours after a precipitation even[. On <br />this basis, the division 'oelieves chat discharges will occur <br />when scream flow is well above the 7-day, 10-year low flow. <br />Thus, cecl:nology based limitations for runoff ponds will <br />adequacel;~ protect instream water quality standards. <br />Settleable Solids Limicac'_on - This limitation may apply co <br />discharges resulting from precipitation less than or equal co <br />the 10-year, 24-hour event for the Facility. See the next <br />section for an explanaticn of the exemption procedure. <br />Alternate Limitation Buren of Proof Reouirements - In <br />conformance with 40 CFR-34.63, the permictee has the burden o£ <br />proof when requesting relief from co cal suspended solids (TSS), <br />to cal iron and/or settleable solids limicacions. Relief shall <br />be granted only when necessary and shall not be granted when the <br />permictee has control over the discharge. The permictee should <br />endeavor co meet the primary limicacions whenever possible. <br />