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Mr. Edward L. Bischoff
<br />Page 3
<br />July 16, 1987
<br />material, and it will be 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 j~,~yr
<br />strength, will be more puncture resistant and less prone to environmental
<br />stress cracking than a liner composed of polyvinyl chloride. The ~~ '~
<br />geomembrane liner was manufactured by Poly-America, Inc., of Grand
<br />Prairie, Texas, and installed under the direction and supervision of a /
<br />field representative from Con-Tee Lining, Inc., of Bakersfield, ~./
<br />California. '-"
<br />2. Two monitoring wells were drilled downgradient from the tailings
<br />pond by Ground Water Systems, Inc., of Boulder, Colorado. Accompanying
<br />this letter are 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 60 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 milling activities has been
<br />accomplished. On \1arch 25, 1987, Gold Hill Ventures' staff obtained
<br />water samples from the four 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 HiH Ventures obtained of the water level,
<br />pH, and temperature for the four monitoring wells are noted on each
<br />Report of Analysis.
<br />Operational monitoring will be conducted during the life 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 tailings impoundment area. Two samples of the mill tailings will
<br />be enalyzed and the results will be submitted to the Mined Land Recla-
<br />mation Division during the first year of milling operations. If the type of
<br />flotation reagents are changed during the life of the project, additional
<br />mill tailings samples will be 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, electroconductivity 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. Bureau 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 be stored in the Hazel
<br />A, edit. The preoperational ~.vater sample obtained on March 25, 1987,
<br />
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