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Jerry Moore <br /> 5491 F Street <br /> Page 2 oft <br /> I <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 shouldhelp 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 19.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 <br /> 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 surfacerade and 80 feet bs that should be <br /> 9 9 <br /> sampled and then monitored if appropriate. You may find cone penetration <br /> testing (CPT) a useful tool for acquiring this information. <br /> Questions or comments may be directed to Nuel Henderson at (209) 468-3436.. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Ie-e4 <br /> / <br /> Nuel C. Henderson, Jr., R.G. MargareLagorio. R.E.H.S. <br /> Unit Ill - Site.Mitigation Supervisor, Unit IV <br /> C: James L.L. Barton — CVRWQCB <br /> Rich Johnson — APEX Envirotech, Inc. <br /> 1 <br />