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• III IIIIIIIIIIIII III i <br />~rCD~; HOMARiE <br />ALAN D. COX <br />CORPORATE MANAGER. ENVIRONMENTAL AFFAIq$ <br />State of Colorado <br />~(+j; Department of Natural Resources <br />Division of Minerals and Geology <br />1313 Sherman St., Room 215 <br />Denver. CO 80203 <br />April 7, 1998 <br />RECEIVE© <br />APR 13 1998 <br />Division of Minerals & Geology <br />Attrl: Mr. Allen Sorenson, Reclamation Specialist <br />RE: Bulldog Mine Reclamation Proiect <br />DmG. ~A.,,wC <br />Infiltration Trench Monitoring <br />March, 1998 Monthly Report <br />Dear Mr. Sorensen: <br />Pursuant to The Technical Revision to the Reclamation Permit for the Bulldog Reclamation Project pertaining <br />to installation and operation of an infiltration trench to accommodate seepage from the 9360 adit, attached is <br />a copy of the monthly monitoring data and associated water quality analyses. This is the fifth monthly report <br />as required under the approved TR. <br />During The reporting period preparations were made to install an adit seal in the 9360 adit and continuation of <br />discussions regarding approval of the related Technical Revision to the project DMG Reclamation Permit. <br />We continue to control and managemenT seepage water emanating from the adit. All seepage flows were <br />directed into the infiltration trench with flow rates well below the 30 gpm threshold. Trench Flerforinance <br />continues to meet or exceed expectations. Two (2) vadose zone piezometers adjacent to the infiltration <br />trench were installed in late February and monitoring of the two sites were initiated per the Technical Revision <br />approval conditions. No problems with vadose zone water next to the trench were observed; monitoring data <br />is attached with other monitoring data for the trench and adit flows. <br />We will be preparing a response to your remaining comments on the Technical Revision covering instal:ation <br />and performance monitoring of the plug. <br />One water quality sample was taken during the report period on March 3. Analytical data are attached. <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 />cc: R. Cellan, Grants <br />F. Martinez, Alamosa BLM <br />D. Holmer, Colorado WQCD, Denver <br />J. Rowe / S. Randall, W MCI, Denver <br />S. Shuey, Colorado DMG, Durango <br />HOMESTAKE MINING COMPANY <br />650 CALIFORNIA STREET • SAN FRANCISCO • CA 94106 2]66 (415) 9fit-fit 50 <br />