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- z s - <br /> <br />CJ <br />• <br />7.3 INSTALLATION OI' MONITORING WELLS <br />If the mine management decides to follow our recommen- <br />dations and to relocate the proposed waste disposal pile to <br />some of the locations discussed earlier, we would drill and <br />install two monitoring wells at the proposed location. One <br />of them would be located between the toe of the crushing and <br />screening level fill, and the second one would be located <br />below the proposed toe of the waste disposal pile. Both wells <br />would be drilled either to the ground water level or to the <br />depth of at least 50 feet. The depth required may be more if <br />the thickness of the colluvial soils exceeds some 40 feet. <br />The wells would be equipped wi <br />40, 3" diameter, with 5 to 10 feet of <br />2 feet into the water bearing stratum <br />tween the soil cover and the bedrock. <br />would be enveloped with a gravel pack <br />nite pellets above the perforations. <br />th PVC casing, Schedule <br />perforations installed <br />or on the contact be- <br />The perforated part <br />and sealed with bento- <br />As it is necessary to evaluate the permeability of the <br />soils or rocks below the proposed pile, we propose to per- <br />form two sets of testing; field permeability tests using <br />the falling head method, would be performed in the installed <br />wells. At the same time, undisturbed samples of the soils or <br />rocks would be obtained and laboratory permeability testing <br />would be conducted. <br />If a reasonable amount of water can be collected from <br />the monitoring wells after their installation, water quality <br />samples would be taken. Temperature, pH, and electric con- <br />ductivity would be measured in the field. The samples would <br />be delivered within 12 hours to the laboratory where they <br />would be tested according to the requirements of the Colorado <br />ccoHVOao cowaixa. ~wc. <br />