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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 4. Permit No. CO-0027154 <br />IV. FACILITY DESCRIPTION <br />A. Industry Description (continued) <br />Table IV-2 -- Description of Treatment Facilities <br />Outfall <br />No. Area Served <br />Source Design <br />Capacity 10-Yr, 24-Hr <br />Equiv. Vol. <br />001 Post Mining Areas SR, Spoils Spring 44.3 MG 17.0 MG <br />002 Active Mining Areas SR 1.2 MG 1.12 MG <br />003 Tipple (crusher, stockpile) SR 4.55 MG 0.27 MG <br />004 Tipple (crusher, loadout) SR 0.61 MG 0.35 MG <br />005 Stockpile, Fuel Area, etc SR, Spoils, Hine Dng 9.8 MG 2.2 MG <br />006 Stockpile, Warehouse, Shop SR, Wash Rack 0.92 MC 0.27 MG* <br />007 Truck Wash, Fuel Spillage SR, Spoils, Wash Bay 2.97 MC 0.76 MG <br />008 Active Mining Areas SR 10.35 MG 7.1 MG <br />009 Post Mining Areas SR 5.6 MG 3.87 MG <br />010 Post Mining Areas SR 8.06 MG 3.4 MG <br />016 Post Mining Areas SR 1.82 MG 1.36 MG <br />017 Post Mining Areas SR 0.24 MG 0.22 MG <br />SR means "surface runoff" <br />* 25-year, 24-hour equiv. vol. <br />V. PERFORMANCE HISTORY <br />A. Monitoring Data <br />1. pischarge Monitorine Reports: Discharge monitoring reports (DMR) were <br />reviewed for outfalls 001, 005, 007. The period covered for each summary <br />is noted with each table. <br />Table V-1 -- Self-Monitoring Results For Outfall 001 (1/90 - 3/92) <br />Parameter Reported Previous No. of <br />(all 30-day avg. Concentrations_ Permit Violations <br />unless noted) Avg/Min/Max Limit <br />Flow, MGD 0.87/0.114/2.82 none - <br />pH, s.u. (minimum - maximum) -/7.4/8.7 6.5-9.0 0 <br />TSS, mg/1 7.4/2/16 35 0 <br />Conductivity, umho/cm 2780/1058/3810 6485 0 <br />TR Iron, mg/1 0.13/0.007/0.47 1.0 0 <br />TR Manganese, mg/1 0.398/0.018/2.109 Report* 0 <br />K means "less than" <br />* Reporting was required for calculation of the limitation that applied at <br />outfall 019 - equal to the flow-weighted mean of the results from outfalls <br />001, 005 and 007. <br />