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E <br /> 3555 Hammer Lane <br /> Page 2 of 2 <br /> A Work Plan proposing interim mitigation measures further contaminant plume f <br /> definition, and feasibility studies for this site should be submitted to PHS/EHD by March <br /> 31, 2000, <br /> Feasibility studies will necessitate obtaining soil data regarding permeability,hulk <br /> density, moisture, porosity, and organic carbon content in order to evaluate the rate of <br /> contaminant migration through preferred lithological or other pathways. Provide <br /> PHS/EHD with cross sections showing lithology and boring locations in relation to <br /> contaminant concentrations. Preferred pathways for contaminant migration should be <br /> identified. Pre and Post treatment goals should be identified for the proposed remediation <br /> and/or treatment methods. Refer to EPA 510-B-003 guidelines dated October 1994 <br /> regarding the evaluation of alternative cleanup technologies for underground storage tank <br /> sites. <br /> Continue quarterly monitoring of all monitoring wells for TPHg, BTEX, and .Oxygenates <br /> until otherwise directed by this office. Analyze groundwater samples for 1,2 DCA, <br /> ethanol and methanol during the next sampling event. Depending on the analytical <br /> results for these potential contaminants, their addition to the quarterly monitoring regime <br /> at the site may be necessary. <br /> Contact Carol Oz, Senior REHS at (209)468-3440 if you have further questions regarding <br /> this letter. <br /> Donna Heran,REHS, Director <br /> Environmental�Health <br /> �Division <br /> Carol Oz, Senior REHS Margaret agorio, REHS <br /> Site Mitigation Unit IV Supervisor <br /> cc: Marty Hartzell-CVRWQCB <br /> Al Martinez-ATC <br /> f <br /> i <br />