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CAMBRIA <br /> Approximately 3,486 gallons of groundwater were extracted from well VEW-2 over 4,125 minutes <br /> of operation, which equates to an average extraction rate of 0 84 gpm. The estimated mass <br /> removal of dissolved-phase TPHg, benzene, and MTBE is 3 49, 0 12, and 0 002 pounds, <br /> respectively(Table 3) <br /> RECOMMENDATIONS <br /> Because DPE appears to be an ettective interim remedial strategy for this site, Cambria <br /> recommends conducting additional DPE with the objective of reducing vapor influent <br /> concentrations over the course of the event We propose conducting the additional DPE during the <br /> third quarter 2005, when groundwater elevations are typically at their lowest in extraction well <br /> VEW-2 Based on the results of this subsequent DPE, Cambria will prepare a corrective action <br /> plan and risk-based correction action analysis, to evaluate the appropriate remedial options for this <br /> site We will also continue groundwater monitoring to evaluate whether the DPE activities affect <br /> groundwater concentrations It SJCEHD concurs with this recommendation, Cambria will submit <br /> a work plan detailing these activities <br /> CLOSING <br /> It you have any questions regarding the contents of this document, please call Aubrey Cool at <br /> (510) 420-3336 <br /> Sincerely, <br /> Cambria Environmental Technology, Inc <br /> Dan Lescure <br /> Senior Project Engineer <br /> D GI- <br /> N 0 <br /> Aubrey K Co , RG < �' <br /> Project Geologist <br /> RG 7659 HO 7659 <br /> 9�or CAoF <br /> 0854 10 <br />