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PUBLIO-HEALTH SERVICES <br /> SAN fOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201- 4crao ` <br /> 209/468-3420 ` <br /> BRETT HUNTER SEP 2 5 1936 <br /> CHEVRON USA INC <br /> P O BOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Service Station #9-1918 SITE CODE: 1138 <br /> 45 East Harding Way <br /> Stockton CA 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed review of the 'Request of Site Closure" dated September <br /> 18, 1996 and prepared by Pacific Environmental Group. PHS/EHD has the following <br /> comments for your consideration. <br /> A number of deficiencies were encountered during the review of the closure report, <br /> including: <br /> 1. The table of off site wells should include all wells which were mentioned <br /> in the report. A map showing the relation of the nearby wells to the site <br /> should also have been included. <br /> 2. The report failed to include all soil sample results from beneath all of the <br /> tanks which were removed from the site. Also, the table summarizing <br /> the soil sample results contained numerous errors. Errors which were <br /> noted were with the reporting limits and concentrations detected. <br /> 3. The report failed to clearly indicate the methodology used to estimate <br /> the volume of the remaining soil contamination. <br /> 4. The report failed to clearly indicate the methodology used to calculate <br /> the average concentration of the remaining soil contamination. <br /> 5. The report failed to demonstrate why "background" levels of soil and <br /> groundwater contamination were unattainable. <br /> 6. The report failed to include a rational why conditions remaining at the <br /> site will not adversely impact water quality. <br /> 7. The report referenced a fate and transport model prepared in October <br /> 1993. PHS/EHD has not received nor reviewed the referenced model. <br /> A Division of San Joaquin County Health Cam Services <br />