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ENVIRONMENTAL HEALTH TH DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor Carl BoR.E.H.S. <br /> Director Mike Hugginsins,,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> cy �c• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> F 6 N Laurie A.Cotulla,RE.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> KAREN PETRYNA FEB 2 6 2004 <br /> SHELL OIL PRODUCTS US <br /> 20945 S . WILMINGTON AVE <br /> CARSON CA 90810 <br /> RE: Shell Station SITE CODE: 1223 <br /> 6131 Pacific Ave <br /> Stockton CA 95207 <br /> San Joaquin County Environmental Health Department(SJC/EHD)has reviewed "Interim <br /> Remediation Work Plan Addendum"(Addendum)dated February 12, 2004, that was submitted <br /> on your behalf by Cambria Environmental Technology, Inc. and has the following comments. <br /> Cambria has proposed a dual phase extraction (DPE)event as interim remediation of the soil <br /> contamination remaining at this site. Their proposal is to dewater existing vapor well VEW-2 to a <br /> target depth and extract hydrocarbon vapors from the dewatered soil formation. Their target <br /> elevation for dewatering the well is approximately 45 feet below surface grade(bsg). Cambria <br /> states that they will conduct this interim remediation on VEW-2 for at least three continuous days, <br /> and then will switch to soil vapor extraction of VEW-1 for up to two continuous days, but that the <br /> duration of the tests may be altered depending on the data produced. <br /> As outlined in the Addendum, during the tests Cambria will periodically measure and record <br /> operational data, vapor concentrations, extracted groundwater volume and groundwater <br /> drawdown. Cambria states that vapor samples for laboratory analysis will be collected <br /> periodically, but do not specify exactly how often or how many samples will be sent for analysis. <br /> SJC/EHD approves the use of DPE/SVE for interim remediation of the soil contamination at this <br /> site with the condition that it continue until analysis of extracted vapors indicate that it has been <br /> effective in removing the core of the remaining soil contamination. Elimination of this remaining <br /> soil contamination should help in reduction of the concentration of groundwater contamination, <br /> which is very high in this area. If it does not, however, interim remediation of the groundwater <br /> contamination should be considered. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson,Jr., RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWOCB <br /> Joe Neely, Cambria <br />