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TRAPPER MINING INC. iii iiiiiiiiiiiu m 999 October 27, 2000 CERTIFIED #Z 7099 3220 0003 0831 3389 RECE~ ;,'ED NOV 1 3 Z~?0 Ms. Carla L.enkey Colorado Department of Public Health and Environment WQCD-PE-B2 4300 Cherry Creek Dr. South Denver, CO 80222-1530 Division of Minerals and Geology Subject: Third Quarter 2000 Cobrado Wastewater 1Mschat~e Monitorlug Report,, ~ •. ;~ ~ '- ~ Permit No. CO-0032115 _ ,_.. , . .,.,_ Deaz Ms. L.enkey: Enclosed are Trapper Mine's Third Quarter 2000 Colorado Wastewater Discharge Monitoring Reports for the period 07/1/00-09/30/00. During this quarter, four NPDES outfalls were active. Outfall 002 discharged routinely throughout the quarter. Outfall 001 discharged in July and again in September in response to precipitation events. And outfalls 01 1 and 017 discharged in September in response to precipitation. Outfalls 003, 005, 006, 008, 009, 010, 012, 013, 014, OIS, 016, 019, and 020 did not discharge during the quarter. Outfall 018 is associated with a sediment pond that has not yet been constructed. No discharge is reported for this outfall. Values reported on the enclosed DMRs represent the maximum (or minimum as applicable) monthly/daily values generated at each outfall during the quarter. Also enclosed are monthly NOAA weather summaries for the reporting period, seep volume data for site Ol I, and WET test report forms as applicable. Two outfalls were sampled for WET analyses during the quarter. Two species acute tests were completed at outfalls 001 and Ol 1 during the reporting period. No exceedences of WET test limitations were observed at any tested outfalls. Four exceedences of primary effluent limitations occurred during the quarter, however, in all instances, altemate limitations are applicable as the exceedences were attributable to runoff stemming from a precipitation event and the sediment ponds contributing to the outfalls were being properly maintained and operated. At outfalls OOI, OI 1, and 017, the primary thirty-day average limitations for TSS were exceeded by samples collected 09/22/00 (57 mg/I, 54 mg/I and 68 mg/I respectively). At outfa11017, the primary thirty-day average limitations for total iron was exceeded as well (3.6 mg/1). In all instances, the alternate daily maximum limitations for pH and oil and grease, applicable in the event of discharge caused by precipitation (or snowmelt) greater than or equal to the 10-year, 24-hour precipitation event were met. The alternative daily maximum limitations for settleable solids, applicable in the event of discharge caused by precipitation (or snowmelt) less than or equal to the 10-year, 24-hour precipitation event, were met though these limits were not applicable given the magnitude of the precipitation event causing the discharges. P.0. Box 187 Craig, Colorado 81626 (970) 824-4401