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i <br /> page 2 <br /> 1196 W. Louise Ave. <br /> The analysis results discussed above indicate that an investigation to determine <br /> the extent of hydrocarbon contamination to soil and groundwater is necessary. <br /> PHS/EHD recommends that a series of Geoprobe continuous-core bore holes or <br /> CPT (Cone Penetrometer Testing) be done prior to the installation of <br /> groundwater monitoring wells. The lithological and contaminant plume data that <br /> can be obtained from either of these two methodologies will direct the most <br /> effective placement of the monitoring wells. Borings should be placed such that <br /> they surround the former tank pit and dispenser island area, with one being <br /> placed within five feet of the area where sample S-5 was taken. Borings should <br /> be extended to such a depth that the discrete soil samples obtained will define <br /> the vertical migration at this site. <br /> Please prepare an addendum to the Work Plan which includes the work <br /> described above to begin the investigation of lateral and vertical extent of <br /> hydrocarbon contamination, and submit it to PHS/EHD by September 11, 1998. <br /> If you have any questions or comments please call Lori Duncan at (209) 468- <br /> 0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Lori Duncan, REHS Margare Lagorio, REHS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> George Yamashita, c/o Jeffrey Widman <br /> Gary Mulkey, CCI <br />