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<br /> <br /> Normal dewatering of Sedimen tation Ponds MB #1 and MB #2 occur via underdrain <br />' systems in the bottom of the ponds. The underdrains flow into the outlet <br /> control tower of each pond. All discharges from MB #1 occurred through the <br /> <br /> normal dewatering outlet at discharge point 002 and for MB #2, through the <br />' normal dewatering outlet at discharge point 004. Analyses, as required under <br /> NPDES Permit CO-0038776, show monitoring results from discharges from <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />~I <br /> <br /> <br />Sedimentation Ponds MB #1 and #2 at Outfalls 002 and 004 respectively and are <br />presented below. No exceedences of the NPDES effluent limitations occurred <br />during this quarter from these outfalls. <br />OUTFACE 0021 <br />Parameter <br />Flow <br />Total Suspended Solids <br />Total Iron <br />pH <br />Oil & Grease <br />Conductivity <br />OUTFACE 0042 <br />Frequency Minimum Average Maximum <br />Weekly 0.045 MGD --- 0.054 MGD <br />Monthly --- --- 34.8 MG/L <br />Monthly --- --- 0.10 MG/L <br />Weekly --- --- 3.6 SU <br />Weekly ---- No visible sheen ---- <br />Monthly --- --- 1120 umhos/cm <br />Parameter Frequency Minimum Average Maximum <br />Flow Weekly 0.80 MGD --- 1.3 MGD <br />Total Suspended Solids Quarterly --- --- 5.5 MG/L <br />Total Iron Quarterly --- --- 0.00 MG/L <br />pH Quarterly --- --- 8.0 SU <br />Oil & Grease Quarterly ---- No visible sheen ---- <br />Conductivity Quarterly --- --- 570 umhos/cm <br />1There was only one week during the quarter during which Sedimentation Pond MB <br />#1 discharged. Therefore, only one measurement of total suspended solids, <br />total iron, pH and oil and grease were made. <br />2There was only one week during the quarter during which Sedimentation Pond MB <br />#2 discharged. Therefore only one measurement for total suspended solids, <br />total iron, pH and oil and grease was made. <br />A-2 <br />