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~~o~,,, HON7`;~AKE <br />iii iiiiiiiiiiiuiii <br />ALAN D. COX <br />CORROMTE MANAGER, ENVIRONMENTAL AFFAIRS <br />State of Colorado <br />~ (~' Division of Minerals and Geology <br />Durango Field Office <br />484 Turner Drive, Suite F101 <br />Durango, CO 81301-7910 <br /> <br />~~El:EiVED <br />AUG 1 9 1998 <br />Rece-~ <br />ws s 7 iss~ <br />arhs°b`n'o'M sa~°"ep~ <br />DIVg GEO OGY LS PV L'C H O~~'v~ <br />Attn: Mr. Steve S. Shuey, Reclamation Specialist <br />~F+~~cE: pM Fj j C~P1~ <br />RE: Bulldog Mine Reclamation Project ~ `~ v'T c• ouL~ /(7~ne <br />Infiltration Trench Monitoring <br />July, 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 ninth monthly report as required under the approved TR. <br />During the reporting period construction continued on the installation of an adit seal in the 9360 adit. <br />We continue to control and manage seepage water emanating from the adit. Seepage flows were <br />directed into the infiltration trench and/or the spray evaporation system. Flow rates directed to the <br />infiltration trench were below the 30 gpm threshold, except for a couple of short periods during adit <br />seal construction as noted in the attached summary table. Trench performance continues to meet or <br />exceed expectations. The two 121 vadose zone piezometers adjacent to the infiltration trench were <br />monitored per the Technical Revision conditions. No problems with vadose zone water next to the <br />trench were observed. Vadose zone piezometer monitoring data is attached with other monitoring data <br />for the trench and adit flows. One water quality sample (98-7 Trench Inlet) was taken during the report <br />period on July 1, 1998. Analytical data are attached. <br />In addition, as part of this monthly report and in accordance with the 9360 Level Adit Closure <br />Monitoring Plan, dated April 1998, Windy Gulch monitoring was continued during this period. One <br />water quality sample 198-7 WGWB) was taken on July 1, 1998. Analytical data are attached. Flow at <br />the time of sampling was estimated to be about 40 gpm through the existing weir. <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 />cc: R. Cellan, Gra tr1 s <br />F. Martinez, Alamosa BLM <br />D. Holmer, Colorado WOCD, Denver <br />J. Rowe / S. Randall, WMCI, Denver <br />HOMESTAKE MINING COMPANY <br />650 CALIFORNIA STREET • SAN FRANCISCO • CA 9n0&Y]BB (n5) 9abBt59 <br />