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SEWICESPUBL�� HEALTH Pou,M <br /> SAN JOAQliIN COUNTY <br /> JOGI KHANNA NAD..1NIT.E4. <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hazelton Avenue) • Stockton, California 95201 F o <br /> (209)468-3400 <br /> SEP 0 5 1991 Q <br /> STEPHEN POA <br /> MOBIL OIL CORPORATION <br /> 3800 W ALAMEDA AVE STE 2000 <br /> BURBANK CA 91505-4331 <br /> RE: Mobil Bulk Plant IN REPLY REFER TO SITE CODE: 1968 <br /> 500 E. Grant Line Rd. <br /> Tracy, CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed review of the report entitled <br /> "Supplement Site Investigation" dated July 9, 1991, prepared by <br /> Alton Geoscience. We have the following comments which are to be <br /> addressed in your next quarterly report. <br /> 1. On July 9, 1990, soil excavation was initiated and <br /> approximately 5, 080 cubic yards of soil was excavated and <br /> disposed of at the Durham Road Landfill and the Liquid <br /> Waste Management Facility. Please submit verification <br /> that the soil was received by these facilities. <br /> 2. Analytical results from the qualitative shallow <br /> groundwater survey completed April 30 and May 1, 1991, <br /> were also tabulated, but the lab reports and chain of <br /> custodies were not included. Please submit these <br /> documents to PHS/EHD. <br /> 3 . Analytical results from soil samples B-2, B-3, B-4 and B- <br /> 9 were also tabulated, but the lab reports and chain of <br /> custodies were not included. Please submit these <br /> documents to PHS/EHD. <br /> 4 . Soil contamination is noted off-site. Analysis of boring <br /> B-2 , converted to monitoring well AW-6, indicated that <br /> total petroleum hydrocarbon (TPH) contamination at 6. 0 <br /> feet to 6.5 feet was 180 parts per million (ppm) and at <br /> 11. 0 feet to 11.5 feet was 5.4 ppm. Definition of the <br /> off-site soil contamination is not adequate. <br /> A DMsion of San Joaquin Counn-Health Care Services <br />