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West Elk Mine 2014 Annual Hydrology Report 40 <br />4.4.2 NE Panels Sealed Sump <br />There was no discharge from the MWPF to Sylvester Gulch in WY 2014 (Figure 10) <br />(MCC, 2015). <br />4.5 Colorado Department of Public Health and Environment, Colorado <br />Discharge Permit System (CDPS) Summary <br />4.5.1 CDPS Permit CO -0038776 <br />MCC's CDPS Permit CO -0038776 was amended in WY 2009 and changes became <br />effective on May 1, 2009. This permit is currently under administrative extension while <br />the renewed permit is being prepared and issued. <br />4.5.1.1 Outfall 007A Amendments <br />In 2009, the Water Quality Control Division (WQCD) adjusted applicable TSS <br />limitations for Outfall 007A to 75 and 110 mg/L (30 -day and 7 -day averages, <br />respectively) (Part I.A.l.e.iv). Additionally, the WQCD established mass based, 30 -day <br />average not -to -exceed limitations for biochemical oxygen demand (BOD) and TSS, to <br />replace the percent removal requirements of the permit of 5 lbs./day for BOD and 12 <br />lbs./day for TSS. These limitations are based on a design flow of 0.02 million gallons per <br />day (mgd) and the concentration based on 30 -day average limits of 30 mg/L and 75 mg/L <br />for BOD and TSS, respectively (Part I.A.l.e.iii; CDPHE, 2009a and b). The current <br />CDPHE limits for Outfall 007A are summarized in Table 10. <br />Table 10. Summary of CDPHE Limits for Outfall 007A <br />Source: CDPHE (2009a and b) <br />BOD — biochemical oxygen demand <br />n.a. — not applicable <br />June 2015 HydroGeo, Inc. <br />Discharge Limitations <br />Discharge Limitations <br />Parameter <br />Maximum Concentrations <br />Maximum Concentrations <br />through April 30, 2009 <br />Effective May 1, 2009 <br />30 -Day 7 -Day Avg. or <br />30 -Day 7 -Day Avg. or <br />Avg. Daily Max <br />Avg. Daily Max <br />Total Suspended Solids <br />35 70 <br />75 110 <br />(mg/L) <br />Total Suspended Solids, <br />n.a. >85% <br />-- -- <br />Percent Removal <br />Total Suspended Solids, <br />-- <br />12 n.a. <br />lbs./day (mass loading) <br />BOD mg/L, Percent Removal <br />n.a. >85% <br />-- <br />BOD lbs./day (mass loading) <br />-- -- <br />5 n.a. <br />Source: CDPHE (2009a and b) <br />BOD — biochemical oxygen demand <br />n.a. — not applicable <br />June 2015 HydroGeo, Inc. <br />