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Antonia K.J. Vorster 2 8 December 1989 <br /> Senior Enginee <br /> effectiveness of the proposed ground water extraction scheme to intercept <br /> contaminated ground water. Sampling existing monitoring wells may be sufficient, <br /> however, if this is proposed it must be demonstrated that the existing wells are <br /> appropriately located and screened to act as performance monitoring wells. <br /> 5) One objective of the extraction/injection system performance monitoring program <br /> is to gauge changes to existing contaminant plume migration patterns. Ensotech's <br /> performance monitoring strategy should include the wells (existing and/or new) <br /> that will be sampled to meet this objective. <br /> 6) A brief letter report by Ensotech was submitted to this office on 6 December <br /> 1989. This report contained analyses of existing hydraulic data, and proposed <br /> that the two westernmost extraction wells (EW3 and EW4) be replaced by EW7 and <br /> EW8. Since this is a change from ERC's proposed locations for the extraction <br /> wells, Ensotech should provide us with the contaminant plume concentration maps <br /> alluded to in their 6 December report (page 2, 'CONTAMINANT PLUMES') with the <br /> ERC and the Ensotech extraction well networks superimposed. Once we review these <br /> maps we will decide if the proposed change is merited. <br /> 7) All correspondence regarding the interim ground water system must also be sent <br /> to Mr. Jim Pinasco, Department of Health Services, Sacramento. <br />