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HON •1IGE • ~.. ~:_~. <br />O <br />~ III IIIIIIIIIIIIIIII <br />' CE :~i_._~ I <br />ALAN D. COX JAN 2 8 1998 ~-g-q`~ ~~ePorl" <br />CORPORATE MANAGER, ENVIRONMENT,~:GFFA(P$ji ,,,,,,~.~ ~ ,,, <br />Division o(Minerals 8 Geology <br />__January 14, 1999 <br />State of Colorado <br />Division of Minerals and Geology ,,,~,- ~ 2~ ~~9 <br />Durango Field Office i~ <br />484 Turner Drive, Suite F101 <br />dN ~~~~ o F <br />u~~ G•O.G-~S , <br />®ENVER OFFICE <br />PUBLIC FILE COpy <br />FILE: ,Nj_~~~zls <br />SITE: ~aL ~f,. <br />H~~, <br />~~ /1ePor~Cs <br />Durango, CO 81301-7910 ~~ <br />CERTIFIED MAIL - RE P 120 595 710 <br />Attn: Mr. Steve S. Shuey, Reclamation Specialist <br />RE: <br />Bulldog Mine Reclamation Praiect <br />Infiltration Trench Monitoring <br />December, 1998 Monthly Report <br />Dear Mr. Shuey: <br />Pursuant to the Technical Revision to the Reclamation Permit for the Bulldog Reclamation Project <br />pertaining to installation and operation of an infiltration trench to accommodate seepage from the 9360 <br />adit, attached is a copy of the monthly monitoring data and associated water quality analyses. This is <br />the fourteenth monthly report as required under the approved TR. <br />We continue to control and manage seepage water emanating from the adit. Seepage flows were <br />directed into the infiltration trench at all times. Flow rates directed to the infiltration trench were below <br />the 30 gpm threshold, as noted in the attached summary table. Trench performance continues to meet <br />or exceed expectations. The two 121 vadose zone piezometers adjacent to the infiltration trench were <br />monitored per the Technical Revision conditions. Vadose zone water was not detected in the <br />piezometers nor was there evidence of surface water in the vicinity of the trench. Vadose zone <br />piezometer monitoring data is attached with other monitoring data for the trench and adit flows. One <br />water quality sample 112-98 Trench Inlet) was taken during the report period on December 4, 1998. <br />Analytical data are attached. <br />In addition, as part of this monthly report and in accordance with the 9360 Level Adit Closure Monitoring <br />Plan, dated April 1998, Windy Gulch monitoring was continued during this period. One water quality <br />sample (12-98 WGL Weir) was taken on December 4, 1998. Analytical data are attached. Minimal flow <br />was observed due to frozen conditions at the weir at the time of sampling. A visual estimate of less than <br />5 gpm through the existing weir was made at this time. <br />Thank you for your time and attention on this matter. If you have any questions, please contact me in <br />the San Francisco office. <br />Very Truly Yours, / <br />~° <br />cc: R. Cellan, Grants <br />F. Martinez, Alamosa BLM <br />Holmer, Colorado WOCD, Denver <br />J. Rowe / S. Randall, WMCI, Denver <br />HOMESTAKE MINING COMPANY <br />650 CALIFORNIA STREET ~ SAN FRANCISCO • CA 94t06~2]66 (4~6~ 981-6150 <br />