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ENVIRONMENTAL HEALTHSEPARTMENT <br /> PgU!N SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Program Coordinators <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman, R.E.H.S. <br /> Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> Assistant Director Telephone: (209)468-3420 Margaret Lagorio, R.E.H.S. <br /> c4�tFondw Robert McClellon, R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco,R.E.H.S. <br /> Website:www.sjgov.org/chd/ Kasey Foley, R.E.H.S. <br /> DENIS BROWN <br /> SHELL OIL PRODUCTS NOV 0 2 2006 <br /> 20945 S WILMINGTON AVE <br /> CARSON CA 90810-1039 <br /> RE: Former Texaco Service Station SITE CODE: 1055 <br /> 440 Charter Way <br /> Stockton CA 95206 <br /> San Joaquin County Environmental Health Department(SJC/EHD) has reviewed Groundwater <br /> Monitoring Report— Third Quarter 2006(Report)dated October 12, 2006 submitted on your <br /> behalf by Cambria Environmental Technology, Inc. (Cambria)and has the following comments. <br /> The Report documents the routine quarterly groundwater monitoring and sampling event <br /> conducted at your site on August 7, 2006. The most recently installed wells at this site, the mid- <br /> level and deep wells of the MW-3 and MWA 0 clusters,were sampled for the fourth time since <br /> installation (except MW-3-119, third time). Analytical results showed consistent or increasing <br /> concentrations of contaminants analyzed for in each of these wells. These wells have never <br /> been analyzed for 1,2-dichloroethane or ethylene dibromide, and only once for fuel oxygenates. <br /> Please include a minimum of two consecutive quarters of analysis of these constituents in these <br /> four wells, using appropriate detection limits. <br /> The only recommendation Cambria makes in the Report is to continue routine quarterly <br /> groundwater monitoring and sampling of the site. Per California Code of Regulations, Title 23, <br /> Chapter 16, Section 2652c, contaminated underground storage tank(UST)site reports are <br /> required to contain proposals for investigating and cleaning up the site, and a time schedule for <br /> implementing the proposed actions. <br /> Per California Code of Regulations, Title 23, Chapter 16, Section 2725, Responsible Parties of <br /> contaminated UST sites are required to complete an investigation to assess the vertical and <br /> lateral extent of the release at their site, and to determine a cost-effective method of cleanup. <br /> Please prepare a work plan to continue the investigation of the vertical and lateral extent of the <br /> contamination at this site and submit it to SJC/EHD no later than December 22, 2006. <br /> Please prepare an updated Site Conceptual Model including revised cross sectional diagrams <br /> and submit it to SJC/EHD no later than December 22, 2006. If you have any questions please <br /> call Lori Duncan at(209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson,Jr., PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, PG, CVRWQCB <br /> Mike Murphy, Cambria <br />