REV13684 - Laserfiche WebLink

Home Browse Search

09/20;99 t10Y 15.20 FA3 315 09~ 5018 ~~o~~.~~;1-~~E ~ ALAN D. cox CORPOiUT! MANAGlR. lNYIpCNM6NTAL AFFAI W' HO)<EST.~ l1IVI!`G 13 September, 1999 r . 4. .. '~l~ f~9a2 Division op p d State of Colorado merab 6 ~~~~~~ d~F~CE Geo! 00Y Received ~0- Division of Minerals and Geology Durango Field O ice ~LI~~- ~~ [- s [~ s~,P~ ~/ f-~r~G= t/aJ~ 11 , / 484 Turner Oriva, Suite F101 . I• r •, ~~~~ ~ ~ -77-Z ~S ~ ~ ~ U'-~ ~ D •i'i. i~ V Durango, CO 81301-7910 - --• ' ~,~ IT.: c, ado i1 ~ Durarce rielrl Of!ice Attn: Mr. Steve S. Shuey, Reclamation Speci st Givision or ~iireral , g G 17oc. NaMe: . 9olo 9: RE: Bulldog Mine Reclamation Proiect I August, 1999 Monthly N onitoring Report ~ Dear Mr, Shuey: Pursuant to the Technical Revislons to the Reclamation Permit for the iulldog Reclamation Project, this Is the twenty-first monthly report pertaining to 1) installation and operation o' an infiltration trench to accommodate seepage from the 9360 ad1t, and 2) closing the valve at the 9360 ac it plug. The Division of Minerals and Geology IDMG), in a letter dated March 8, 1999, issued a Condit anal approval for Homastake Mining Company iHMCI to close the valve at the 9380 edit plug. Subsequer t to DMG's approval, HMC closed the valve to the edit plug on April 1, 1999. By closing the valve et the edit plus. HMC Is committed to the monthly monitoring summarized below in accordance with the epprove~ Technical Revislons. Since closure of the edit plug valve on April 1, 7999, no flow has a is being directed Into the infiltration trench. ThereTore, as noted In Table 1, the infiltration trench ant vadose zone monitoring have been discontinued. The revised monitoring program was initiated in April 1999. Summari rs of the monthly monitoring data are presented in Tables 1 end 2, and Figure 1 attached. Based on the rat wired visual inspection around the edit plug, the plug is Impounding water behind it with no signs of seepag~ and/or development of seeps around the portal area. No flow was observed in DT-1 and DT-2 during the mt nthly sampling activities. As part of this monthly report and In accordance with the 9360 Lew I Adit Closure Monitoring Plan, dated April 1998, Windy Gulch monitoring was continued during this period. Flow was observed through the WGL Weir during this period end a water quality sample (WGL Weir) taken o i August 4, 1999. Analytical data for this sample are attached. Tha estimated Clow through the weir at the t me of sampling was approximately 20 gpm. Continuous flow monitoring at the WGL Weir was initiated In tpril 1999. Figure 2 summarizes the flow through the weir to date. Thank you for your time and attention on this matter. If you have ar /questions, please contact me In the San Francisco office. Very Trutt' Yours, / • (~ cc: R. Callan, Grants F. Martinez, Alamosa 8LM D. Holmar, Colorado WDCD, Denver J. Rowe / S. Randall, WMCI, Denver HOMESTAKE MINING COMPANY OSU CAl1rORNIA STREET • SAN PMANCISGO • G 910&~rBE ~<151 Y91~i150