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a <br /> PUBL 'C HEALTH SEkVICES oP4��N <br /> SAN JOAQUIN COUNTY a <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) •Stockton, California 95201 o4c�FOR��P <br /> (209) 468-3400 <br /> •CC)BILL KELLERFy <br /> GENSTAR WESTERN STONE PRODUCTS <br /> P O BOX 3171 DEC 0 9 1992 <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 reviewed the <br /> "Quarterly Monitoring/Source Removal Excavation Report" dated November 24, 1992 and prepared by <br /> RESNA. PHS/EHD has the following comments for your information. <br /> Excavation of contaminated soil associated with the former leaking underground storage diesel tank was <br /> initiated on October 7, 1992 and continued through October 9, 1992. Residual soil contamination is <br /> documented on the western wall up to 50 ppb benzene, 340 ppb toluene, 1,300 ppb ethylbenzene, 890 <br /> ppb xylene, and 64 ppm TPH-diesel. The extent of residual soil contamination, which poses a threat to <br /> groundwater quality, has not been characterized. Please be aware that PHS/EHD will not consider the <br /> site for closure until the extent of the residual soil contamination has been determined. <br /> Approximately 400 cubic yards of soil was removed during the excavation. Four stockpiles of <br /> contaminated soil resulted and are awaiting a disposal plan. The contaminated water which was <br /> removed during excavation activities is stored in a baker tank and has been proposed to be <br /> bioremediated. Please submit information regarding the treatment process and additives. Please submit <br /> a work plan to define the boundaries and extent of residual soil contamination and a soil disposal plan <br /> with the next quarterly report due February 8, 1993. <br /> If you have any questions or wish to schedule a site inspection, please contact <br /> Mary Meays, RENS, of my staff at (209) 468-0337. <br /> Jogi Khanna, P.H. <br /> Health OfFc <br /> tie A. Co�HS, Program Manager <br /> nvironmental Health Division <br /> I <br /> -LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB c: Greg Stahl, RESNA <br /> A Division of San Joaquin Counry Health fare Scmces <br />