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J. H. KLEINFELDER & ASSOCIAOS <br /> File: 5-1008-.21/12 : 317 <br /> June 26, I -So00- <br /> Page 3 <br /> before drilling the east and west wells. Whichever well (or <br /> wells) on the site becomes the upgradient well must be <br /> placed far enough away from the landfill that it would not <br /> pick up any leachate from the landfill if it were to occur. <br /> Response: <br /> The wells shall be drilled in the order suggested. <br /> Comment: <br /> 3. To ensure that accurate ground water elevations are <br /> determined as ground water is encountered, proposed well <br /> locations must be surveyed before drilling begins, and a <br /> monument should be established near each well site. <br /> Elevations of completed wells must subsequently be <br /> determined to a 0.01 foot accuracy. <br /> Response: <br /> Elevations will be surveyed as suggested. <br /> Comments: <br /> 4. At each quarterly sampling, ground water levels in the wells <br /> must be determined prior to purging or sampling. In <br /> accordance with Section 2556 A. 4 Subchapter 15 , ground water <br /> contours, ground water velocity, and direction of flow must <br /> be plotted on a site map and submitted each quarter to the <br /> Regional Board. <br /> Response: <br /> Ground water levels shall be determined prior to sampling <br /> and purging of the wells as part of the quarterly monitoring <br /> program. Aquifer material will be collected during drilling <br /> so that field values for hydraulic conductivity and porosity <br /> can be determined, for use in determining ground water <br /> velocity. <br />