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<br />1 <br />J <br />Patricia Nelson <br />July 28, 1993 <br />Page 2 <br />maintain a sufficiently low water level in the pond to prevent <br />leaking so that the structural integrity of the embankment was <br />preserved. The dewatering activities caused relatively high <br />discharge velocities to occur, which in turn caused higher than <br />normal suspended sediment levels to occur. PWCC plans to repair <br />the outlet pipe in the near future. <br />At Outfall 006, the April TSS average was 37 mg/1, which exceeds <br />the monthly average limit of 35 mg/1. This noncompliance <br />average TSS value is due to a 52 mg/1 TSS measurement made on <br />4/13/93. A subsequent TSS measurement made at this site on <br />4/15/93 was only 22 mg/1, indicating that high TSS levels were <br />present at this site for only a short period of time. The TSS <br />value of 52 mg/1 was due to snowmelt runoff, since Pond 006 had <br />not received mine pit pumpage (i.e., mine drainage) in the <br />recent past, and no spoil springs or truck wash facilities exist <br />in the basin upstream of Pond 006. PWCC has unsuccessfully <br />requested that, during periods of stormwater runoff, this site ~-,- <br />be exempt from TSS limits, and that emits be applicable per " '' <br />Federal NPDES guidelines. A settleable solids measurement of <br /><0.4 ml/1 was measured at this site on 4/13/93, which meets <br />standard stormwater runoff limits. <br />Please contact Brad Dingee of my staff if you have any questions <br />or require additional information. <br />Sincerely, <br />~~ <br />Gary W. Wendt <br />Manager <br />Environmental Affairs <br />bd <br />Enclosure <br />c: Brad Dingee <br />Dennis Jones <br />L <br />