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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 275 <br />Denver, Colorado 80103 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8706 <br />August 31, 2004 <br />Peter Wayland <br />WSI Weiland, Inc. <br />10395 Colfax Ave., Suite 350 <br />Lakewood, CO 80215 <br />RE: Bonser Pit -Technical Revision No. 1, Adequacy Concerns, Permit M-2000-156 <br />Class: Revision Type-Seq.: TR-1 <br />Dear Mr. Wayland: <br />COLORADO <br />DIVISION O F <br />MINESRALS <br />GEOLOGY <br />¢ECLANATION•NININC <br />SAiETY•SCIENCE <br />Bill Owens <br />Govemar <br />Russell George <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />The Division is currently reviewing your request for a technical revision for the Bonser Pit to allow for <br />bonding in two (2) phases. Following is a list of adequacy concerns that will need to be resolved on or <br />before September 10, 2004. Please provide the following items: a) an itemized cost for complete liner <br />keyway construction for each phase, b) an itemized cost per phase for backfilling 275 linear feet of <br />0.5/1 pit slopes to a 3:1 configuration with 10,000 cubic yards of overburden, and c) please describe the <br />secondary containment measures that will be employed for containment of asphalt, diesel fuel, or other <br />petroleum products. Attached is a copy of the Division's standard spill containment stipulation that will <br />need to be incorporated into your permit via this revision request.. Also, the Division is revising the initial <br />de-watering cost for each phase based on a 22' high water column during maximum disturbance. <br />Also, it is the Division's understanding that 1) there will be no berm 10 feet in height above ground <br />surface, comprised of overburden, 2) a total of 749,000 cubic yazds of overburden will be removed <br />throughout the life of the operation and that a maximum of 10,000 cubic yazds of overburden will be <br />stored at any one time during each phase of the operation, 3) the average pit depth will be 28 feet and pit <br />slopes will approximate 0.5/1 during mining, 4) there will be a maximum of 275 lineaz feet of exposed pit <br />slope (north, east, or west pit slope) in each phase that will require backfilling with overburden to achieve <br />a 3:1 configuration, 5) southern pit slopes will be pushed and re-graded to a 3:1 slope, and 6) the average <br />depth to groundwater is 6 feet below ground surface. These terms will become a part of the mining plan <br />as a result of this revision request. Please respond if any of the terms noted aze not correct. <br />Please call me at (303) 866-3567 if you have any questions or pease advise if you need additional time to <br />provide the information requested on or before September 10, 2004. <br />Sincerely, <br />. G'~~2zL <br />Thomas A. Schreiner <br />Environmental Protection Specialist <br />Attachment <br />Office of Office of Colorado <br />nniow7 l and RPrlxmarinn AIYIVP ]p!I IORfM1VP MInPG Geoloeical Survev <br />