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OC''-99 THU 12 ~ 39 PM <br />t~~ <br />RQV R. CELLAN <br />GOrrGMfE MPNLGFP <br />RECLAMATION <br />?.0 October, 1999 <br />DMG DURANGO FIELD OFFICE <br />,.., <br />State of Colorado <br />Division of Minerals and Geology <br />Durango Field Office <br />701 Camino Dcl Rio, Room 125 <br />Durango, CO 81301 <br />Attn: Mr. Steve S. Shuey, Reclamation Specialist <br />FAX N0, 970+247+5104 P, 02 <br />M-~9-2tS <br />~q~~/~. <br />~~~~ <br />ENVIRONMEMAL NEALTH. SAFEIr <br />PNO GCYERNMENT nEMinS <br />Received <br />fl~T 2 2 1ay3 <br />U~~o MoBrat~gG~olo9Y <br />RE: Bulldo~t Mine Reclamation Proiect September, 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-second monthly report pertaining to 11 installation and operation of an infiltration trench to <br />accommodate seepage from the 9360 adit, and 2I closing the valve at the 936D adit plug. The Division of <br />Minerals and Geology IDMG), in a letter dated March 8, 1999, issued a conditional approval far Homestake <br />Mining Company (HMC) to close the valve at the 9360 adit plug. Subsequent to DMG's approval, HMC <br />closed [he valve to tho adit plug on April 1, 1999. Since closure of the adit plug valve, no flow was directed <br />into the infiltration trench. Monitoring of the hydraulic conditions behind the adit plug indicated that as of <br />August 7.5, 1999, conditions had stabilized lie pressure measurements stabilizedi. Asa result, DMG <br />approved initiation of tho planned tracer test (Ref: Letter from WMCI to Mr. Steve Shuey, dated August 27, <br />19991. The tracer test subsequently began on September 9, 1999. With the initiation of the tracer test, <br />HMC is committed to the monthly monitoring summarized in Table 1 in accordance whit the approved <br />Technical Revisions. <br />The revised monitoring program was initiated in September 1999. Summaries of the monthly monitoring data <br />arc presented in Tables 2 and 3, and Figure 1 attached, Based on the required visualinspectiort around the <br />adit plug, the plug is impounding water behind it with no signs of seepage and/or development of seeps <br />around the portal area. No flow was observed in pT-1 during the monthly sampling activities. Minimal flow <br />was observed in OT-2 and samples taken as shown in Table 2. Completed analyses of the charcoal and <br />water samples taken during this period as pan of the tracer test, indicate that no fluorescein dye was <br />defected in any of the samples (see attached Ozark Underground Lab analytical resultsl. <br />As part of this monthly report and in accordance with the 9360 Level Adit Closuro 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 September 9, 1999. Analytical data <br />for this sample are attached. The estimated flow through the weir at the time of sampling was approximately <br />150 gpm. Continuous flow monitoring at tha WGL Weir was initiated in April 1999. Figure 2 summarizes <br />the flow through the weir to date. <br />Thank you for your time and attention on this matter <br />San Francisco o 'ce. <br />Very ruly r , <br />cc: A. Cox, HMC San Francisco <br />F. Martinez, Alamosa BLM <br />D. Holrner, Colorado WOCD, Denver <br />J. Rowe) S. Randall, WMCI, Denver <br />If you have any questions, plcaso contact me in the <br />HOMESTAKE MINING COMPANY <br />ro. Sox ;+• cxnNTy. NM avazo~aat I <br />