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N <br /> page 2 <br /> 640 EI Dorado <br /> It is the recommendation of Ground Zero that additional borings be advanced to the <br /> southeast and north of the former tank pit area, and that a minimum of three <br /> groundwater monitoring wells be installed. <br /> It is the recommendation of PHS/EHD that additional borings be advanced in all <br /> directions from the former tank pit area to completely define the vertical and lateral <br /> extent of contamination to soil and water. It is further recommended that the additional <br /> borings be advanced using geoprobe continuous core methodology or cone <br /> penetrometer testing (CPT) to more fully understand the subsurface Iithology. <br /> Monitoring wells will need to be installed. <br /> Please submit to PHS/EHD by August 20, 1999 a work plan to continue the investigation <br /> of the contamination evidenced at this site. Include in the work plan the PHS/EHD <br /> recommendations discussed above. If you have any questions please call Lori Duncan <br /> at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> (.ave a '7Vlt <br /> Lori Duncan, REHS Margare Lagoria, REHS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> John Lane, Ground Zero <br />