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ROVt't, HOS+I,~KE • <br />~~ <br />ALAN D. COX <br />CORPORATE MANAGER, ENVIRONMENTAL AFFAIRS <br />iii iiiiiiiiiiiuiii ~ <br />State of Colorado <br />`j ~: Division of Minerals and Geology <br />Durango Field Office <br />484 Turner Drive, Suite F101 <br />RECEIVED <br />S E P 1 6 1998 <br />Re~~ <br />SS~f998~/ <br />q//~ !`~~ <br />ofMlnerall~gGl o <br />o9Y <br />Durango, CO 81301-7910 <br />DIV. OF MINERALS u~N~ ~ OFFICE <br />Attn: Mr. Steve S. Shuey, Reclamation Sp & GEOLOGY + v <br />RE: Bulldog Mine Reclamation Project F'~E~ M-, ~ COp r <br />17oc. T(ar-Le. S1TE.(~u~ ~ / <br />Infiltration Trench Monitoring /fi~~ <br />August, 1998 Monthly Report <br />Dear Mr. Shuey: <br />Pursuant to the Technical Revision to the Reclamation Permit for the Bulldog Reclamation Project <br />pertaining to installation and operation of an infiltration trench to accommodate seepage from the 9360 <br />adi[, attached is a copy of the monthly monitoring data and associated water quality analyses. This is <br />the tenth monthly report as required under the approved TR. <br />We continue to control and manage seepage water emanating from the adit. Seepage flows were <br />directed into the infiltration trench at all times except fora 2-'/: day period. During this period the adit <br />plug valve was shut to allow for plumbing and pump reconfiguration and maintenance on the <br />evaporative spray system. Flow rates directed to the infiltration trench were below the 30 gpm <br />threshold, except for a short period after the adit plug valve was re-opened. Trench performance <br />continues to meet or exceed expectations. The two 121 vadose zone piezometers adjacent to the <br />infiltration trench were monitored per the Technical Revision conditions. Vadose zone water was not <br />detected in the piezometers nor was there evidence of surface water in the vicinity of [he trench. <br />Vadose zone piezometer monitoring data is attached with other monitoring data for the trench and adit <br />flows. One water quality sample 198-8 Trench Inlet) was taken during the report period on August 4, <br />1998. Analytical data are attached. <br />In addition, as part of this monthly report and in accordance with the 9360 Level Adit Closure <br />Monitoring Plan, dated April 1998, Windy Gulch monitoring was continued during this period. One <br />water quality sample 198-8 WGWB) was taken on August 4, 1998. Analytical data are attached. Flow <br />at the time of sampling was estimated to be about 5 gpm through the existing weir. <br />Thank you for your time and attention on this matter. If you havt: any questions, please contact me in <br />the San Francisco office. <br />Very Truly Yours, <br />cc: R. Cellan, Grants / _ <br />F. Martinez, Alamosa BLM <br />D. Holmer, Colorado WOCD, Denver <br />J. Rowe / S. Randall, WMCI, Denver <br />HOMESTAKE MINING COMPANY <br />650 CALIFORNIA STREET • SAN FRANCISCO • CA 9A106-2)68 (A151961 8150 <br />