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ENVIRONMENTAL.HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> CIO Unit 5upervtsors <br /> a z DK Heran,R E H S <br /> 304 East Weber Avenue, Third Floor Carl Borgman,R <br /> Donna <br /> Director Mike Huggins,R E H S,R D I <br /> Al Olsen,R E N S Stockton, California 95202-2708 Douglas W Wilson R E H S <br /> • oR a�P • Program Manager Telephone (209) 468-3420 Margaret Lagono,R E H S <br /> L i o R Laurie A Cotulla,R E N SRobert McClellon R E H S <br /> Program Manager Fax (209) 464-0138 Mark Barcellos,R E H S <br /> MICHAEL SOUZA OCT 0 2003 <br /> SOUZA II LLC Q C f - 1 n03 <br /> 105 E TENTH STREET <br /> TRACY CA 95376 <br /> Fn Souzza H LTC SITE CODE 1283 <br /> 612 West Eleventh Street RO 1283 <br /> Tracy, CA 95367 <br /> On 02 October 2003,representatives of the San Joaquin County Environmental Health <br /> Department (EHD)met with John Lane of Ground Zero Analysis, Inc and Patrick Riddle, <br /> Attorney At Law, at the EHD office to review the status of the site at 612 West Eleventh Street, <br /> Tracy, California, for closure consideration <br /> The EHD presented its view of the current state of the site assessment and requested completion <br /> of the following before EHD continues evaluation the site for closure <br /> • Delineation of the vertical extent of soil and groundwater contamination by advancing a <br /> boring twenty-five to thirty feet in depth,terminating at the clay layer beneath the former <br /> Tank 4 location, and collecting continuous soil samples and a grab groundwater sample at <br /> total depth, <br /> • Recalculation of the hydrocarbon mass with inclusion of the total petroleum hydrocarbon <br /> as gasoline result of 1700 milligram per kilogram from soil sample TS2 T4-13E, as well as <br /> data collected from advancing the proposed bonngs, <br /> • Analysis of groundwaLel sai:iples for 1,2-dichloroethare and report results at a detection <br /> limit of 0 5 micrograms per liter, the maximum contaminant level for drinking water <br /> adopted by the California Department of Health Services, <br /> • Modeling of the transport of submerged hydrocarbon mass,with estimated parameters of <br /> sorption, desorption, seepage rate, dispersion,diffusion, and natural attenuation, and <br /> • Testing the transport model by advancing a boring down gradient to the impacted plume <br /> if access to a suitable location can be reasonably obtained <br /> At the 02 October 2003 meeting, Ground Zero Analysis, Inc indicated agreement with the <br /> • concerns and recommendations of EHD to delineate the vertical extent of soil and <br /> groundwater contamination at this site Please submit a work plan to conduct the necessary <br /> additional site characterization <br />