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PUBLIC HhALTH SERVICES PIN Co <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer F1 E COPY <br /> 9tik0RCN <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95 2 <br /> 209/468-3420 MM 17 <br /> RICHARD OAKDEN ALFONSO OCAMPO <br /> 1052 W PORTER AVE 3210 MUNFORD AVE <br /> STOCKTON CA 95207 STOCKTON CA 95205 <br /> Re: Electro Delta Site Code:2241 <br /> 821 S. Wilson Way <br /> Stockton,CA 95205 <br /> San Joaquin County Public Health Services Environmental Health Division(PHS/EHD)has reviewed the <br /> Site Contamination Work Plan dated February 19, 1999 prepared by Upgradient Environmental <br /> Consultants. The Work Plan is incomplete and further information is required. <br /> The following components should be included in the Work Plan addendum: <br /> 1) A well survey of domestic,municipal,agricultural, industrial and any other wells within a 2,000 foot <br /> radius of the site. Contact the Department of Water Resources,municipal water suppliers and nearby <br /> industries for well information. Perform a physical search of the area to identify any wells. Show the <br /> locations of all wells, submit any known construction details of the wells. Identify all sources of <br /> information in the well survey report and clearly depict each well location as they relate to the above <br /> referenced site. Discuss conclusions regarding public and environmental health risks as they relate to <br /> the pumping influence of these identified wells and the migration and potential impact of the <br /> contaminant plume. <br /> 2) Drain holes have been identified at the site. Provide information on the drain/sump areas and describe <br /> the systems construction and discharge location. Show cross sections and aerial view of drain system <br /> as it relates to the previous Underground Storage Tank(UST) location. <br /> 3) San Joaquin County Flood Control maps for 1978 show that ground water was 90 feet below surface <br /> grade in the area at that time. The current ground water level is at approximately 55 feet below surface <br /> grade. Submit a statement that the investigation will continue vertically as deep as necessary to <br /> confirm two consecutive five foot interval non detect samples. <br /> 4) Monitoring Wells(MWs)should be placed closer to the old UST location,within 20 feet. Submit a <br /> modified map showing MW locations in proximity to the old UST area. <br /> Submit a Work Plan addendum to PHS/EHD by April 19. 1999. Contact Carol Oz,Senior REHS if you <br /> have questions regarding this letter. <br /> Donna Heran, Director <br /> Environmental health Division agorio, <br /> Carol oz Senior REHS Margazet REHS <br /> Site Mitigation UnitlV Supervisor <br /> cc: Mark List-CVRWQCB <br /> A Division of San Joaquin County Health Care Services <br />