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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) Stockton,California 95201 <br /> c4�iFpa��P <br /> (209)468-3400 <br /> BILL KELLER <br /> GENSTAR WESTERN STONE PRODUCTS `� . <br /> P O BOX 3171 ; �i APR 2 21993 <br /> MODESTO CA 95353 <br /> RE: Genstar/Western Stone Products SITE CODE: 1393 <br /> 8181 West Eleventh Street <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services,Environmental Health Division (PHS/EHD)has <br /> reviewed the "First Quarter 1993 Monitoring Report" dated March 12, 1993 and prepared <br /> by RESNA. PHS/EHD has the following comments for your information. <br /> PHS/EHD requested in correspondence dated December 9, 1992 that a work plan be <br /> submitted to define the extent of residual contamination. Residual soil contamination of up <br /> to 50 ppb benzene, 340 ppb toluene, 1,300 ppb ethylbenzene, 890 ppb xylene and 64 ppm <br /> TPH-diesel was detected in the sample collected on October 8, 1992 from the western wall <br /> of the excavation. PHS/EHD does not agree with the conclusion in the above mentioned <br /> report that no further investigation is necessary. Please be informed that the site will not <br /> be considered for closure until the extent of residual contamination is physically defined <br /> and/or remediated. Please submit a work plan to investigate the extent of residual <br /> contamination by June 15, 1993. <br /> Please contact the Central Valley Regional Water Quality Control Board for approval of the <br /> proposed groundwater and stockpiled soil disposal options. <br /> If you have any questions or wish to schedule a site inspection to witness groundwater <br /> sampling, please contact Mary Meays, Senior REHS, of my staff at (209) 468-0337. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Officer <br /> a le A. Cotulla, REHS, Program Manager <br /> E vironmental Health Division <br /> LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB c: Greg Stahl, RESNA <br /> A Division of San Joaquin County Health['are Services 101 <br />