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II I I II I II_I II IIII III � <br /> 999 <br /> V) 'L t O <br /> n >=! , <br /> COLORADO DEPARTMENT OF HEALTH <br /> Richard D. Lamm �� Thomas M. Vernon, M.D. <br /> Governor 8 6 Executive Director <br /> /February 18, 1986 <br /> Mr. Gary G. Van Riper, Ph.D. / <br /> AMAX Minerals and Energy, f/ <br /> Exploration and Technical Service <br /> 1707 Cole Boulevard <br /> Golden, Colo. 80401-3293 <br /> RE: AMAX Climax Facility Groundwater Mo r m <br /> ermit Requirements; Permit Number CO-0000248 <br /> Dear Mr. Van Riper: <br /> The division has reviewed the previous reports which AMAX has submitted <br /> regarding groundwater monitoring, including "Groundwater Study Design <br /> Report, Climax Colorado" (December 3, 1984) and "Reply to Comments on <br /> Tenmile Groundwater Study" (June 20, 1985) . Also, the division has <br /> previously inspected the site (August 23, 1985) to evaluate comments <br /> regarding groundwater monitoring at the facility. <br /> Based upon the above information as well as other considerations, the <br /> division has determined that AMAX is still required to install <br /> groundwater monitoring wells near the tailings pond, and that surface <br /> water monitoring in Ten Mile Creek is not in itself adequate to evaluate <br /> groundwater quality. Groundwater monitoring from wells near the tailings <br /> pond is necessary to obtain a timely indication of water quality and a <br /> more immediate indication of any problems which would require <br />` correction. With the presence of 40 to 60 feet of alluvium below the <br /> tailings pond drains as well as previous occurrences of underdrain pH <br /> values of 2-3 s.u. , there is a significant potential of poor quality <br /> water impacting groundwater. Thus, the groundwater quality in the <br /> immediate area must be assessed from well samples. <br /> As indicated on pages 7, 8, and 9 of the permit, Climax is required to <br /> 9 submit its complete design report, and is directed to install a <br /> groundwater monitoring program to establish a data base on groundwater <br /> quality and quantity and to ensure that groundwater degradation is not <br /> occurring and will not occur at the site. <br /> 4210 EAST 11TH AVENUE DENVER, COLORADO 80220 PHONE (303) 320-8333 <br />