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.. ~ ~ ~ R~~eiv~d NOM AKE SrrP Z 4 !!!!!!~~~~~~~666666 ?0p' ENVIRONMENTAL. HEALTH. SAFF^'-- {//~/y~-j_ AND GOVERNMENT AFFAIRS III IIIIIIIII IIII'll1 "W~nO /^-F•e,~O~o 999 "O `~ 8 Or~.,~ -++/ September 18, 2001 ®~~~~~ ®4 ~~r~~a~ ~~~ ,= B~~ ~~C';e;~/3y~~~/~~~>>~z1~~ State of Colorado ~/y~~p`p"'~- ~/<7,(~ ~` Division of Minerals and Geology 5 Durango Field Office y ~~rfS 701 Camino Del Rio, Room 125 Durango, CO 81301 (~i~~~'~~9[~~ AI[n: Mr. Steve S. Shuey, Reclamation Specialist RE: Bulldog Mine Reclamation Project SCP ~ 'l 2009 August, 2001 Monthly Monitoring Report Division of Minerals and Geology Dear Mr. Shuey: Pursuant to the Technical Revisions to the Reclamation Permit for the Bulldog Reclamation Project, this is the forty-fifth monthly report pertaining to 11 installation and operation of an infiltration trench to accommodate seepage from the 9360 adit, and 21 closing the valve at the 9360 adit plug. The Division of Minerals and Geology (DMG1, in a letter dated March 8, 1999, issued a conditional approval for Homestake Mining Company IHMCI to close [he valve at the 9360 adit plug. Subsequent to DMG's approval, HMC closed the valve to the adit ploy on April 1, 1999. Since closure of the adit plug valve, no flow has been directed into the infiltration trench. Monitoring of the hydraulic conditions behind the adit plug indicated that as of August 25, 1999, conditions had stabilized fie pressure measurements stabilized). As a result, DMG approved initiation of the planned tracer test (Ref: Letter from WMCI to Mr. Steve Shuey, dated August 27, 1999). The tracer test subsequently began on September 9, 1999. With the initiation of the tracer test, HMC is committed to the monitoring summarized in Table 1 in accordance with the approved Technical Revisions. The revised monitoring program was initiated in September 1999. A summary of the monthly monitoring data is presented in Table 2. Based on the required visual inspection around the adit plug, the plug is impounding water behind it with no signs of seepage and/or develop~Tten[ of seeps around the portal area. A pressure measurement and visual observation was completed of the 9360 adit plug and portal on August 8, 2001 and recorded in Table 3. 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. Water levels in the Creede Formation Well, located upslope of the 9360 Adit, have been recorded continuously since its installation, and data for the last year are presented graphically in Figure 1. Flow data for the WGL Weir has been recorded continuously with an automated datalogger since April 17, 2001. Flow data for the WGL Weir are presented in Figure 2. A water quality sample IWGL Weir) was taken on August 8, 2001. The analytical results for this sample are attached. HOMESTAKE MINING COMPANY P.O BD% 90 • GRANTS, NM B]020-0011