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999 <br />TRAPPER ~RtNiNG zNC. <br />July 14, 1999 <br />CERTIFIED NZ 404 219 664 RECEIVED <br />JUL 191999 <br />Division of Minerals 8 Geobijy <br />Ms. Carla Lenkey <br />Colorado Department of Public Health and Environment <br />WQCD-PE-B2 <br />4300 Cherry Creek Dr. South <br />Denver, CO 80222-1530 <br />Subject: Second Quarter 1999 Colorado Wastewater.Discliarge Monitoring Reports, <br />Permit No. CO-0032115 <br />Dear Ms. lenkey: <br />Enclosed are Trapper Mine's Second Quarter 1999 Colorado Wastewater Discharge <br />Monitoring Reports for the period 4/1199-6/30/99. During this quarter, five NPDES outfalls <br />were active. Outfalls 001, 002, and 011, discharged routinely throughout the quarter. <br />Outfalls 013 and 017 discharged during the last week in April in response to snowmelt and <br />precipitation events. Outfalls 003, 005, 006, 008, 009, 010, 012, 014, 015, 016, 019 and 020 <br />did not dischazge during the quarter. Values reported on the enclosed DMR's represent the <br />maximum (or minimum as applicable) monthly values generated at each outfall during the <br />quarter. <br />Also enclosed are monthly NOAA weather summaries for the reporting period, seep volume <br />data for site 011, and WET test report forms as applicable. Three outfalls were sampled for <br />WET analyses during the reporting period. Two species tests were completed at outfalls 001 <br />and 011 while a single species test (P. promelas) was completed at outfall 002. No <br />exceedences of WET test limitations were observed at any of the outfalls. <br />Two exceedences of primary effluent limitations aze noted as follows, however, in both <br />instances, alternate limitations are applicable as runoff was attributable to either snowmelt <br />and/or precipitation. At outfall 013, the primary 30-day average limitation for TSS was <br />exceeded by a sample collected 4/27/99 (56 mg/1). At outfall 017, the primary 30-day average <br />limitation for TSS was also exceeded by a sample collected 4/27/99 (40 mg/I). However, in <br />both instances, the alternate daily maximum limitation for settleable solids applicable in the <br />event of discharge caused by precipitation less than or equal to the 10-year, 24-how <br />precipitation event, was met. As noted on the enclosed monthly NOAA weather summary for <br />P.O. Box 187 Craig, Colorado 81626 (970) 824-4401 <br />