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Roger Liston Page 2 <br /> PHS/EHD recommends that contaminated groundwater beneath the Darpetro site be put under hydrostatic <br /> control . There is no workplan for a groundwater hydrostatic control system, such as an extraction well, for <br /> this site at this time. PHS/EHD recommends that the plume at this site be put under some type of hydrostatic <br /> control to reduce potential contamination levels of neighboring sites. <br /> At this time PHS/EHD recommends that you install the vapor extraction wells at the pre designated locations <br /> under permit from this agency by August 30, 1995. A workplan for additional subsurface investigation of the <br /> groundwater plume on APN 147-343-11 shall be submitted by August 30, 1995 . The next quarterly report <br /> should discuss the newly installed vapor extraction system, the status of the subsurface investigation of the <br /> upgradient portion of the plume and plans for hydrostatic control of the plume. The report should include <br /> a fence diagram showing lithology, groundwater elevations and vertical contamination contours of the known <br /> extent of the plume. A groundwater remediation system should be installed subsequent to definition of the <br /> lateral extent of the groundwater plume. <br /> For further information please contact Steven Sasson at (209) 46&3459. <br /> Donna Heran, REHS, Director <br /> yirEnvnmental Health Division <br /> Sass , Seio� I Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> cc: Elizabeth Thayer, CVRWQCB <br /> Annabelle Mackey, SWRCB <br /> John Cussen, California Geophysical Group <br /> Richard Merriam, California Geophysical Group <br /> I <br /> I <br /> i <br /> i <br /> I <br /> i <br /> i <br />