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CLIMAX MOLYBDENUM COMPANY <br /> ClimaxA unit of AMAX Inc. <br /> August 31, 1993 <br /> Certified Mail No. P397 830 109 <br /> Mr. Bruce Humphries <br /> Supervisor - Minerals Program <br /> Division of Minerals and Geology <br /> 1313 Sherman Street - Room 215 <br /> Denver, Colorado 80203 <br /> RE: CLIMAX MINE AND MILL PRELIMINARY GROUNDWATER MONITORING <br /> PLAN Permit No. M 77-493 <br /> Dear Mr. Humphries: <br /> Thank you and your staff for the time spent at our August 5, 1993 meeting <br /> reviewing and providing input to the CLIMAX Mine and Mill preliminary groundwater <br /> monitoring plan. The purpose of this letter is to document the results of our meeting, <br /> provide requested information and establish a schedule for the agreed upon action <br /> items. It remains our goal to strictly comply with the terms of the Act and to minimize <br /> the environmental impacts of our operations. <br /> As the CLIMAX Mine has potential impact to three drainages, I will review the <br /> results of our discussions concerning each drainage separately. <br /> TENMILE DRAINAGE <br /> CLIMAX personnel reviewed the history of groundwater investigations in the <br /> Tenmile drainage and the geologic-hydrologic assumptions and conclusions drawn <br /> from studies completed in 1984 under the direction of the Colorado Department of <br /> Health. The 1984 work resulted in the installation of two groundwater monitoring wells <br /> that have been monitored since 1987. Monitoring has shown no impact to the <br /> groundwater in the Tenmile drainage basin. The Division agreed that historical <br /> monitoring of this drainage was adequate and asked to review groundwater and <br /> surface water monitoring results. Those results are attached. <br /> EAGLE RIVER DRAINAGE <br /> CLIMAX personnel summarized the geology/hydrology of the drainage basin, <br /> noting the #4 dam project. Division staff agreed that groundwater is not present <br /> below #4 dam due to the extremely shallow soil cover and the concrete cutoff wall at <br />