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- 21 - <br /> 5.0 FUTURE STUDIES REQUIRED <br /> <br /> 5.1 GROUND WATER MONITORING SYSTEM <br /> <br /> The potential of ground water contamination at the <br /> site of the proposed waste pile is very low for the following <br /> reasons: <br /> <br /> 1. No aquifers are present within 50 feet of the topo- <br />' graphic surface of the lower bench, <br /> 2. Impermeable soils (permeabilities on the order of <br />' 10-~ to 10-9 cm/sec) are present immediately below the <br /> waste pile. <br /> <br /> 3. The dimensions of the waste pile are very limited. <br />' Despite these favorable conditions, -installation of an <br /> appropriate ground water monitoring system is recommended. <br /> As a result of this installation, reliable data on ground <br /> water will be obtained; our assumptions on ground water will <br />' be monitored during the life-time of the project; samples <br />f <br />d <br />if <br />b <br />b <br />d <br />I <br />d <br /> groun <br />o <br />water ( <br />any) can <br />taine <br />. <br />n a <br />dition, <br />e o <br /> missing data on geotechnical conditions (depth to bedrock, <br /> physical properties) will be obtained. <br />' We propose to install two monitoring wells, one in- <br /> stalled above and one below the proposed waste pile. Both <br /> wells will be drilled to the bedrock surface or to 50 feet <br /> (whichever is shallower). <br />' <br /> Field permeability tests using the falling head <br />' method will be performed during drilling to evaluate the <br />f <br />h <br />t <br />l <br />B <br />i <br />ll <br />bili <br />f <br />d <br />i <br />i <br />h <br />i <br /> permea <br />ty o <br />on ma <br />er <br />a <br />. <br />ot <br />mon <br />tor <br />ng we <br />e <br />oun <br />at <br />s <br />t <br /> will be installed with PVC casing. <br />1 <br /> iNC <br /> . <br />~o«roQOCO~.w~mw. <br />