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i <br /> Enclosure, Sharpe RI Report <br /> -4- 8 March 1991 <br /> Sharpe Site <br /> • Obtain the electrical records for the supply wells (SHAD supply and <br /> agricultural supply wells) to estimate the pumpage. These estimates can be <br /> used for the flow model and pumpage should support the findings from the <br /> hydrographs and the ground water contour maps. <br /> • If recovery data is available on the aquifer tests, these data should be <br /> analyzed to come up with additional aquifer parameters for the different <br /> differenceshbetweenrtheeata"zones" wil�fbegablertoabemeters, the more readily <br /> determined, <br /> • Use of a 3-Dimensional flow model is strongly recommended. The three <br /> layer, non-interactive 2-Dimensional flow model which has been used seems <br /> burdensome and inaccurate for projecting cleanup scenarios. If the system <br /> is really not a three layer system (that is, the A, B and C zones) as <br /> defined in the Report, the reliability of the model is significantly <br /> reduced because it is not accurately modeling the hydraulic interactions of <br /> the system. Thus, the reliability of the capture zone analysis is <br /> questionable and which in turn may cause the cleanup system to be less <br /> effective and may increase and pumping monitoring costs over the long-term. <br /> CKW:cw <br />