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HON'AKE • <br />ALAN D. COX <br />CORPORATE MANAGER. ENVIRONMENTAL AFFAIRS <br />State of Colorado <br />Division of Minerals and Geology <br />Durango Field Office <br />484 Turner Drive, Suite F101 <br />Durango, CO 81301-7910 <br />RE~E~~~~ <br />FE6 22 ~g99 <br />r_ <br />p~ns~a~ctM~~~s <br />Attn: Mr. Steve S. Shuey, Reclamation Specialist <br />Receryed <br />fEB 1 8 1999 <br />Divlaion of M ^er~ 8 Geology <br />®~e~ <br />~p I <br />Hy~~° <br />J <br />RE: Bulldog Mine Reclamation Project <br />Infikrauon Trench Monitoring <br />January, 1999 Monthly Report <br />Dear Mr. Shuey: <br />V~~°/~ u <br />®~ 9 <br />frl^ <br />~ ~~~ <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 fifteenth 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 during this report period. Flow rates directed to the <br />infiltration trench were below the 30 gpm threshold, as noted in the attached summary table. Trench <br />performance continues to meet or exceed expectations. The two (2) vadose zone piezometers adjacent <br />to the infiltration trench were monitored per the Technical Revision conditions. Vadose zone water was <br />not detected in the piezometers nor was there evidence of surface water in the vicinity of the trench. <br />Vadose zone piezometer monitoring data is attached with other monitoring data for the trench and adit <br />flows. One water quality sample (1-99 Trench Inlet) was taken during the report period on January 7, <br />1999. 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 January 7, 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 Yours, <br />cc: R. Cellan, Grants <br />D. Holmer, Colorado WOCD, Denver <br />F. Martinez, Alamosa BLM <br />J. Rowe / S. Randall, WMCI, Denver <br />A. Sorenson, Colorado DMG, Denver <br />iii iiiiiiiiiiiu iii <br />999 <br />February 4, 1999 <br />HOMESTAKE MINING COMPANY <br />650 CALIFORNIA STREET • SAN FRANCISCO • CA 9a10&2]68 (4t51981~8150 <br />