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~~~ Mr. Bdwnrd i!Bischoft <br />Page 3 <br />July 18, 1987 <br />..-.. <br />material, and 1t will De less susceptible to deterioration due to prolonged <br />_ exposure to sunlight and weathering. it also possesses good chemical <br />resistance to acids and heavy metals and, because of Its high tensile <br />strength, will be more puncture resistant and less prone to environmental <br />stress cracking than a liner composed of polyvinyl chloride, The <br />geomembrene 1-ner was manufactured by Poly-America, Ina., of Grand <br />Prairie, Texas, and installed under the direction end supervision of a <br />field representative from Con-Ter Lining, inc., of Bakersfield, <br />California. <br />2. Two monitoring wells were drilled downgrad[ent from the tailings <br />pond by Ground Water Systems, ]ne., of Boulder, Colorado. Accompanying <br />this letter ere copies of the Colorado Division of Water Resources' <br />Permits for those two monitoring wells. These two wells were spaced 135 <br />feet apart and were drilled to a depth of 80 feet, with the upper 20 feet <br />encased in steel pipe to prevent surface water migration from contami- <br />nating the wells. The location of these two monitoring wells will be <br />plotted and submitted on the revised Millsite and Tailings Pond Recla- <br />mation Plan Map. <br />Preoperational monitoring to establish the baseline ground water <br />conditions which existed prior to the onset of miUing activities has been <br />accomplished. On March 25, 1987, Gold Hill Ventures' staff obtained <br />water samples from the Your wells that will be used to monitor the <br />amount and quality of the ground water in this part of the permit area. <br />The attached Reports of Analysis from Hazen Research, Inc., of Golden, <br />Colorado, Includes total dissolved solids, and laboratory parameters of <br />sulfate, iron, copper, lead, zinc, silver, mercury, arsenic, and cadmium. <br />The field parameters that Gold Hill Ventures obtained of the water level, <br />pH, and temperature for the four monitoring veils are noted on each <br />Report of Analys[s. <br />Operational monitoring will be conducted during the 11[e of the <br />milling project on a quarterly basis, unless it can be demonstrated that <br />potential ground water contaminants are not migrating downgradient <br />from the tatlfngs impoundment area. Two samples of the miA tailings will <br />be analyzed and the results will be submitted to the Mined Land Recla- <br />mation Division during the first year of milling operations. 1t the type of <br />flotation reagents are changed during the life of the project, additional <br />mill tailings samples will De analyzed and the results forwarded to the <br />Mined Land Reclamation Division for comparison with the water samples <br />from the monitoring wells. Gold Hill Ventures will sample the mill tail- <br />ings water for the following parameters: field parameters of pH, <br />temperature, electroconductlvlty or total dissolved solids; and laboratory <br />parameters of sulfate, iron, copper, lead, zinc, silver, mercury, arsenic, <br />cadmium, xanthate concentrations, and any other mill chemicals used in <br />our processing facility. <br />The U.S. 8uresu of Mines test well located closest to the Cash <br />,- -. mine access road was selected for the purpose of monitoring the ground <br />water level and chemistry of the water that will De stored in the Hazel <br />A. edit. The preoperational water sample obtained on March 25, 1987, <br />