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HON~'AlGE • O ALAN D. COX CORPORATE MANAGER, ENVIRONMENTAL AFFAIRS State of Colorado Division of Minerals and Geology Durango Field Office 484 Turner Drive, Suite F101 Durango, CO 81301-7910 Attn: Mr. Steve S. Shuey, Reclamation Specialist a~~E`~~~ 4 ~g99 t'1A'~ 2 &~eoW9'I ptvtstppO~Mt~ta~ ~~ ~ ~~~ ~~ ~~~/(j~ . J ?~ ~j~ ~~ S /- ~ III IIIIIIIIIIIII III neceived MAY 2 p 1999 14 May, 1999 DiNabrt~~9oFleldpryfce ~~~ of Mlner~ g neology ~~ RE: Bulldog Mine Reclamation Proiect April, 1999 Monthly Monitoring Report Dear Mr. Shuey: Pursuant to the Technical Revisions to the Reclamation Permit for the Bulldog Reclamation Project, this is the seventeenth monthly report pertaining to 11 installation and operation of an infiltration trench to accommodate seepage from the 9360 adit, and 21 closing the valve a[ the 9360 adit plug. The Division of Minerals and Geology (DMGI, in a letter dated March 8, 1999, issued a conditional approval for Homestake Mining Company (HMCI to close the valve at the 9360 adit plug. Subsequent to DMG's approval, HMC closed the valve to the adit plug on April 1, 1999. By closing the valve at the adit plug, HMC is committed to the monthly monitoring shown in Table 1, in accordance with the approved Technical Revisions. Since closure of the adit plug valve on April 1, 1999, no flow has or is being directed i;tto the infiltration trench. Therefore, as noted in Table 1, the infiltration trench and vadose zone monitoring have been discontinued. Immediately prior to closing the valve, the adit seepage flow to the infiltration trench was measured at 25 gpm and one last water quality sample was taken from the trench inlet 14-99 Trench Intetl. Analytical data for that sample are attached. The revised monitoring program was initiated during the report period at [he adit plug, downstream seeps, and the Creede Formation Well as outlined in Table 1. Summaries of the monthly monitoring data are presented in Tables 2 and 3, and Figure 1 attached. Based on the required visual inspection around the adit plug, the plug is impounding water behind it witl-~ no signs of seepage and/or development of seeps around the portal area. As part of this monthly report and in accordance with the 9360 Level Adit Closure Monitoring Plan, dated April 1998, Windy Gulch monitoring was continued during this period. Flow was observed through the WGL Weir on April 1, 1999, 170 gpm -Table 2) and a water quality sample (WGL Weir) taken; associated analytical data are enclosed. Thank you for your time and attention on this matter. If you have any questions, please contact me in the San Francisco office. Very Truly Yours, cc: R. Cellan, Grants F. Martinez, Alamosa BLM D. Holmer, Colorado WQCD, Denver J. Rowe / S. Randall, WMCI, Denver HOMESTAKE MINING COMPANY 650 CALIFORNIA STREET • SAN FRANCISCO • CA 9a10&2]6B p15) 98,~6~50