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ifOM A K E <br /> <br />ALAN D. COX <br />CORPORATE MANAGER, ENVIRONMENTAL AFFAIRS <br />Received <br />Sf P 2 2 i9g9 <br />13 September, 1999 pN. DO~~ F. <br />State of Colorado <br />Division of Minerals and Geology <br />Durango Field Office <br />464 Turner Drive, Suite F101 <br />Durango, CO 81301-7910 <br />Attn: Mr. Steve S. Shuey, Reclamation Specialist <br />D c_~ 01 i~ rsrort of A.flne~a~ 8~eo1 <br />~/U~CVI~ C ~ ~® E`~~~FivFO ~ <br />RE: Bulldog Mine Reclamation Proiect August, 1999 Monthly Monitoring Report <br />Dear Mr. Shuey: <br />Pursuant to the Technical Revisions to the Reclamation Permit for the Bulldog Reclamation Project, this is the <br />twenty-first monthly report pertaining to 1) installation and operation of an infiltration trench to accommodate <br />seepage from the 9360 adit, and 2) closing the valve at the 9360 adit plug. The Division of Minerals and <br />Geology IDMGI, in a letter dated March 8, 1999, issued a conditional approval for Homestake Mining <br />Company IHMCI to close the valve at the 9360 adit plug. Subsequent to DMG's approval, HMC closed the <br />valve to the adit plug on April 1, 1999. By closing the valve at the adit plug, HMC is committed to the <br />monthly monitoring summarized below in accordance with the approved Technical Revisions. <br />Since closure of the adit plug valve on April 1, 1999, no flow has or is being directed into the infiltration <br />trench. Therefore, as noted in Table 1, the infiltration trench and vadose zone monitoring have been <br />discontinued. <br />The revised monitoring program was initiated in April 1999. Summaries of the monthly monitoring data are <br />presented in Tables 1 and 2, and Figure 1 attached. Based on the required visual inspection around the adit <br />plug, the plug is impounding water behind it with no signs of seepage and/or development of seeps around <br />the portal area. No flow was observed in DT-1 and DT-2 during the monthly sampling activities. <br />As part of this monthly report and in accordance with the 9360 Level Adit Closure Monitoring Plan, dated <br />April 1998, Windy Gulch monitoring was continued during this period. Flow was observed through the WGL <br />Weir during this period and a water quality sample (WGL Weir) taken on August 4, 1999. Analytical data for <br />this sample are attached. The estimated flow through the weir at the time of sampling was approximately 20 <br />gpm. Continuous flow monitoring at the WGL Weir was initiated in April 1999. Figure 2 summarizes the <br />flow through the weir to date. <br />Thank you for your time and attention on this matter. If you have any questions, please contact me in the <br />San Francisco office. <br />Very Truly Yours, / <br />(`~ <br />cc: R. Cellan, Grants <br />F. Martinez, Alamosa BLM <br />D. Holmer, Colorado WQCD, Denver <br />J. Rowe / S. Randall, WMCI, Denver <br />HOMESTAKE MINING COMPANY <br />850 CALIFORNIA STREET • SAN FRANCISCO • LA 9410&2]89 1415) 9Bt~Bt50 <br />