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COLORADO DEPARTMEM' OF HEALTH, Water Quality Control Division Rationale -Page 6, Permit lYo. CO-0034142 Since the facility does not discharge pollutants limited by inter quality standards, with the exception of pH, to the Yampa River, the low flows of the Yampa River will nor be used to calculate water quality-based effluent limitations at Ou,falir 013, 014, 016, 018, 019, 020, and 021. Additionally, Outfalir 003, 004, 007, 009, 011, 012, 015, and 017, discharger associated with surface rtuwfffrom post mining areas to the Williams Fork River, do ruu contain pollutants limited by rater qualify standards. 77tcrefore, the low fbws of the Williams Fork River will not be used to calculate water quality-based tjjluent limitations ar these outjalis. The acute and chronic !ow flows ojthe Willrams Fork River will be used to calculate rater quality-based effluent (imitations at Outfalls 003, 022, and 024, which discharge mine water, and Outfall 023, which discharges efjlueru from the wastewater treatment stabilization pond. /V. FACILITY DESCRIPTION A. Industry Description 7ht CEC Eagle Mint Complex is an underground coal mining operation. Surface mining conducted in the past is inpost-mining phase. Outfall 002, consisting of mine drainage from the No. 9 Mine, was eliminated from the previous permit in January 1987 (Amendment IJ. Amendment 4 to the permit reactivated old Outfall 002, (utentfled in the new permit as Outfall 024J which discharges mine water from the No. S and No. 6 Mines. Outfall 006, assaciatrd with surface runoff from a reclaimed area sedimentation pond was deleted from the permit (Amendment SJ in Ap~i[ 1990. 1. 7Yoe oflndustrv -CEC operates an underground coal mining operation 2. Sources to the Treatment Plant - On September 27, 1990, CEC requested that the permit be amended ro add to the discharge from Outfall 009 the flow from an oil/water separator. 7ht oil/water separator receives wash down inter from a servlce building. Water from the separator flows to sedimentation pond SA-PI where it is commingled with runoff from reclaimed areas of the sitc. The discharge from Pond SA-PI is Outfall 009. Based on information provided by the pmnittee in the above referenced lener, the porul it designed to handle the additional flow. 3. Chemicals Used - No changes in chemicals used at the facility have occurred since the issuance of the previous permit. 8. Wastewater Treatmeru Description With the exception of the addition of the oil/water separator for the treatment of additional flows to Outfall 009, no changes with the wastewater treatmem systemr hove occurred since the issuance of the previous permit.