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u <br />• <br />o After final grading of the pile surface. <br />o After final covering in preparation for revegetation. <br />We consider the potential for ground water contamination <br />at the site to be very Low due to the depth to ground water, <br />~ the generally low permeability of the soils underlying the <br />proposed pile locations, and the limited dimensions of the <br />pile. However, we recommend the installation of an appro- <br />priate ground water monitoring system once the final location <br />of the pile is selected. This should be installed in conjunc- <br />tion with a limited geotechnical investigation program which <br />i <br />should be undertaken to confirm the presence of the types of <br />soils assumed during this evaluation directly below the waste <br />rock Wile site. As a result of this installation, reliable <br />j data on ground water would be obtained; our assumptions on <br />I~ ground water should be monitored during the life-time of the <br />it <br />'; project; samples of ground water (if any) should be obtained. <br />i <br />In addition, confirming date on geotechnical conditions <br />i (depth to bedrock, physical properties) would be obtained. <br />I <br />I <br />[de propose the installation of two monitoring wells, one <br />installed above and one below the proposed waste pile. Both <br />II wells should be drilled 10 feet into bedrock or to 50 feet <br />(whichever is shallower). Borings B-5 and B-6, in which <br />permeability tests have already been performed, should be <br />suitable monitoring installations if the eastern waste rock <br />~ dispnsa] site is used. <br />In addition we recommend considering the installation <br />of one or two monitoring caells in the bedrock to be able to <br />' monitor ground water conditions in the first bedrock aquifer. <br />i Idater levels should be measured on a monthly basis and <br />water quality samples should be collected and analyzed accord- <br />. ing to the regulatory agencies' requiremel~ts. <br />- 33 - <br />GEO-NVDRO CONSUl11NG. INC <br />