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ENVIRONMENTAL HEALTH`bEPARTMENT <br /> °P "'N pyo SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> aar: < Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> ._. i. Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> P Program Manager Telephone: (209)468-3420 Douglas W.Wilson,R.E.H.S. <br /> q�iFORr'� Margaret Lagorio,R.E.H.S. <br /> Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> CHARLES MILLER PALISADES GAS FB 8 1 20M <br /> USA PETROLEUM CORPORATION <br /> 30101 AGOURA COURT STE 200 <br /> AGOURA HILLS CA 91301-4311 <br /> RE: USA GAS.#835 Site Code: 1072. <br /> 2705 Country Club Blvd ROM 1504 <br /> Stockton, CA. 95204 <br /> San.Joaquin County Environmental Health Department (EHD) has reviewed Site <br /> Conceptual Model(SCM) and Subsurface Investigation Report dated January 9, <br /> 2006 and has the following comments. <br /> The SCM.was required by EHD in correspondence dated July 12, 2005 as a <br /> condition of the work plan.approval.for the placement of the seven Cone <br /> Penetrometer Test (CPT)soil borings to define the lateral and vertical extents of the <br /> petroleum hydrocarbon contaminated ground water plume. <br /> The SCM included soil and.ground water data from the initial 1991 investigation.to <br /> the third quarter-2005 ground water monitoring. report. Two subsurface cross <br /> sections,tabulated soil and.ground.water data, site maps, discussions, and <br /> recommendations were included in the SCM. <br /> Based on historical data and recent ground.water data, EHD concurs with <br /> recommendations included in the SCM that further investigation. is required to <br /> delineate the ground water contaminated plume. <br /> A work plan for the continued investigation should be submitted to EHD within sixty <br /> (60) days of this letter. <br /> In future updates of the. SCM please include soil and ground water data for <br /> constituents of concern in the cross sections. Additionally, isoconcentration (iso- <br /> cons) maps for constituents of concern should be included in the. SCM. Multiple <br /> maps and iso-cons should be generated as needed to clearly illustrate the <br /> subsurface information. <br /> A work plan to gather soil and ground water data will be required in areas and at <br /> depths where data is not available to support delineation conclusions. <br />