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Mr. Ken Gillies <br /> Gillies Trucking <br /> 3931 Newton Road, Stockton <br /> Page 2 of 3 <br /> Well designs for the on-site domestic well (G-1), the Bardot well on the <br /> adjacent parcel, and other water wells in the immediate vicinity that may <br /> exert a pumping influence on the plume of impacted ground water; <br /> A characterization of the pumping influences of the G-1 and Bardot wells <br /> on the plume of impacted ground water; or <br /> Delineation and characterization of the channel identified by UEC. <br /> It should be noted that while the EHD review of the data in the files was fairly <br /> extensive, it was not exhaustive, and some of the information may have already <br /> been developed and presented. <br /> The information detailed above combined with the currently known data should <br /> allow construction of the hydrogeological model of the site, provide insight on the <br /> size and strength of the plume of impacted ground water, and allow prediction of <br /> the potential for plume migration under the natural gradient and the various <br /> nearby pumping influences. Visualizations from such a model should provide a <br /> qualitative evaluation of the risk posed by the release to the local ground water <br /> supplies. <br /> To move toward completion of the site characterization, EHD recommends that <br /> you: <br /> Characterize the pumping influence of G-1 and the Bardot wells on the <br /> plume by utilizing leveloggers in appropriate site monitoring wells during <br /> pumping from each water well. That G-1 is a pumping influence on the <br /> plume is demonstrated by occurrences of diesel-range hydrocarbons in <br /> the ground water samples collected from the well; the recommended test <br /> may help evaluate the magnitude of the influence. <br /> Conduct a video survey of and replace G-1 as previously directed to <br /> minimize its influence on the dissolved phase plume. <br /> Conduct pumping tests from each of the three monitored screened <br /> intervals to characterize the hydrologic properties of each interval to <br /> determine ground water seepage velocities to ascertain the maximum <br /> rate that impacted ground water could encounter nearby water wells; <br /> Conduct a Cone Penetrometer Testing (CPT) investigation to identify and <br /> correlate potentially high permeability hydrologic units and to obtain grab <br /> ground water samples from such units to delineate and/or characterize <br /> the plume of impacted ground water. If CPT is not appropriate for the <br /> area, another <br /> icient information to <br /> achieve the goals tofdcapable collecting <br /> theinvestigationn shou d be selected. Information <br /> obtained from such a study may demonstrate the need, or lack of need, <br /> for additional ground water monitoring wells and aid selection of <br />