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<br />O <br />ALAN D. COX <br />CORPORATE MANAGER, ENVIRONMENTAL <br />~~CEIVED <br />fWAR 17 1999 <br />DENlfER ®FFICE <br />1'U~LIC FILE C®Py <br />FILL:: -~~-Z~s <br />ra.4s <br />Mah <br />~~ ~:rstatfx~~l~s~~~y <br />Division of Minerals and Geology <br />Durango Field Office <br />484 Turner Drive, Suite F101 <br />Durango, CO 81301-7910 <br />March 9, 1999 <br />III IIIIIIIIIIIII III <br />Rece~v~ <br />MAR g ~ 14g9 <br />D <br />Oivisro~ o ~ e~ 8 Gep o9Y <br />R~ej~~ <br />MAR 15 ~~g9 <br />Attn: Mr. Steve S. Shuey, Reclamation Specialist <br />RE: Bulldog Mine Reclamation Project <br />~8a "~~9b <br />a~ ~ ~~y~e <br />ep/p~' <br />Infiltration Trench Monitoring <br />February. 1999 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 />adit, attached is a copy of the monthly monitoring data and associated water quality analyses. This is <br />the sixteenth 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. Flow rates directed to the infiltration trench were below <br />the 30 gpm threshold, as noted in the attached summary table. Trench performance continues to meet <br />or exceed expectations. The two 12) vadose zone piezometers adjacent to the infiltration trench were <br />monitored per the Technical Revision conditions. Vadose zone water was not detected in the <br />piezometers nor was there evidence of surface water in the vicinity of the trench. Vadose zone <br />piezometer monitoring data is attached with other monitoring data for the trench and adit flows. One <br />water quality sample (2-99 Trench Inletl was taken during the report period on February 9, 1999. <br />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. No flow <br />was observed due to frozen conditions at the WGL weir on February 9, 1999, and therefore a water <br />quality sample was not taken. <br />Thank you. for your time and attention on this matter. If you have any questions, please contact me in <br />the San Francisco office. <br />Very Truly Your~~ ~~ <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 />660 CALIFORNIA STREET • SAN FRANCISCO • CA 96108-2188 (4i6~ 981-6160 <br />