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III IIIIIIIIIIIIIIII <br />TRAPPER MINlNCINC. <br />RECEIVEQ <br />March 24, 1995 MAR 2 7 1995 <br />Mr. Jon Kubic division of ~~unerais 8 Geology <br />Colorado D ent of Health <br />Water aliry Control Division <br />4 Cherry Creek Drive South <br />Glendale, CO 80222-1530 <br />Subject: Colorado Wastewater Discharge, Permit CO-0032115, Trapper Mining Inc. <br />Dear Jon: <br />in January 1995, Trapper filed a request to modify our NPDES Permit, CO-0032115. Part of the <br />modification request included discontinuing the collection of the seep volume flow data from NPDES <br />Site 005. As per your request, I've enclosed the scep volume flow data collected since the 4th quarter of <br />1991. <br />As shown by the flow data, there is little fluctuation in the seep flow. Due to the general consistency of <br />the seep flow, we feel this weekly flow measurement can now be discontinued. <br />The Parshall flume for site 005 is located about 50 feet downstream of the Coyote Dam discharge point <br />with sceps between the pond and flume. Therefore, a flow is measured ai the flume while no discharge is <br />occurring form the pond. The orJy way for Coyote Dam to discharge is if the headgate is opened. Due <br />to the consistent flow data from the seeps, if Trapper were to discharge form Coyote Dam, accurate Flow <br />data could be obtained. <br />Finally, Coyote Dam has held less than 5% of the 40 acre-feet available water storage the past four <br />years. We fcel this is primarily due to the reclamation efforts within the Coyote Drainage. Mining is <br />complete within the drainage area, with grading and topsoil replacement on mine spoils complete. <br />Reseeding of the area is also finished. [t is doubtful if Coyote Dam will have any future discharges. <br />I hope this information helps you in the evaluation of discontinuation of weekly flow data collection from <br />NPDES Site 005. Please call if you have any questions. <br />Sincerely, ~~ d <br />Larry'Henderson <br />Sr. Environmental Engineer <br />LWH,~m&~CDFr0724 <br />me <br />c FV lake <br />AfW Wehmaxn <br />''/Joe Dudasl4 CDMG <br />File 109.2.7.2 <br />P.O. Box 187 Craig, Colorado 81626 (303) 824-4401 <br />