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Y <br /> IIS Ripon Farm Service <br /> Page 2 <br /> PHS/EHD concurs with the recommendation to continue the soil and groundwater <br /> investigw`ation and understands that problems have been encountered when attempting to <br /> gain access to the neighboring property. Based on the information which is currently <br /> available, an estimate of the extent of soil and groundwater contamination associated with <br /> the former underground storage tanks should be possible. <br /> Also, evaluation of remedial alternatives should be initiated. Since it is likely that feasibility <br /> analysis will require the installation of testing wells, PHS/EHD suggests that a work plan be <br /> prepared. In fact, it is likely that the installation of depth discrete monitoring wells will be <br /> necessary to evaluate the potential for vertical migrations. PHS/EHD understands the <br /> difficulties associated with designing a remediation system without full site <br /> characterization; however, the concentrations which have been evidenced will require <br /> active remediation. <br /> If you have any questions, please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM/22871 HWY <br /> cc: Elizabeth Thayer, CVRWQC8 <br /> cc: James DeMera, PO Box 560 Lodi CA 95241 <br /> cc: Bob Marty, 1803 March Lane Ste. A Stockton CA 95207 <br /> cc: George, Firenze, Olympian Oil, 260 Michele Court, South San Francisco CA 94080 <br /> cc: John Trump, 2280 Union St. San Francisco CA 94123 <br />