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Jerry Moore <br /> 5491 F Street <br /> } Page 2 oft <br /> It is noted in the WPSSI that its purpose is to delineate the vertical and lateral <br /> extent of impacted ground water as was directed by EHD, but then only proposes <br /> to install five shallow ground water monitoring wells around the periphery of the <br /> known plume. The proposed wells should help delineate the lateral extent of <br /> impacted ground water, but will not address the vertical extent. On this basis, the <br />{ proposed scope of work is not adequate to address the EHD 18 November 2003 <br /> directive, and work proposed in the WPSSI is not approved. Please submit a <br /> revised work plan or work plan addendum so that both elements of the directive lr <br /> j are addressed by 01 June 2004. EHD recommends that the proposed monitoring <br /> well MW-17 be moved further toward the east or northeast to more tightly <br /> delineate the plume of impacted ground water. EHD also recommends that the <br /> vertical extent of impacted ground water be investigated near the suspected <br /> source area, in the down-gradient direction, and near MW-12 to be sure the <br /> plume is not 'diving' and to obtain design criteria for a sentinel well for the Marty <br /> well. Please note that the driller's log for the Marty well suggests four sand <br /> intervals of interest between surface grade and 80 feef bsg that should be <br /> sampled and then monitored if appropriate. You may find cone penetration s <br /> testing (CPT) a useful tool for acquiring this information. t <br /> Questions or comments may be directed to Nuel Henderson at (209) 468-3436. <br /> r <br /> Donna Heran, RENS, Director <br /> Environmental Health Division ; <br /> Nuel C. Henderson, Jr., R.G. Margare Lagorio. R.E.H.S. <br /> Unit IV - Site Mitigation Supervisor, Unit IV <br /> C: James L.L. Barton — CVRWQCB <br /> Rich Johnson —APEX Envirotech, Inc. <br /> f ' <br />