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III 'II'IIIII"IIIII <br /> 999 STATE. Off- COLORADO <br /> COLORADO DEPARTMENT OF HEALTH IF coo <br /> 4210 East 11 th Avenue <br /> Denver. Colorado 80220 <br /> Phone (303) 320-8333 <br /> Roy Romer <br /> Governor <br /> February 10, 1987 Thomas M.Vernon, M.D. <br /> Executive Director <br /> Gary G. Van Riper, Ph.D. <br /> AMAX Minerals and Energy <br /> Exploration and Technical Service <br /> 1707 Cole Boulevard <br /> Golden, Colo. 80401-3293 <br /> RE: AMAX Climax Facility Groundwater Monitoring Program Proposal <br /> Permit No. : CO-0000248 <br /> Lake County <br /> Dear Mr. Van Riper: <br /> The Water Quality Control Division has reviewed the Climax Groundwater <br /> Monitoring Program, dated November 24, 1986, and we have the following <br /> comments related to the construction of the wells: <br /> 1. The length of surface casing should probably not exceed 10 feet, <br /> in light of the possibility that only 20 feet of alluvium exists <br /> at the site. <br /> 2. The screened interval for the well should not exceed 15 feet. The <br /> selection of the screened interval should be made during <br /> drilling. The interval with the coarsest, most permeable <br /> material, should be the interval screened. <br /> 3. A concrete cap should be constructed at the surface and a <br /> bentonite seal should also be placed above the screened interval <br /> to assure uncontaminated samples. <br /> 4. More detail is'needed for the construction of the wells. Please <br /> submit a general schematic showing the well construction, <br /> including the types of materials to be used. Attachment 1 is an <br /> example of such a schematic. <br />