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PUBLIC HEALTH SEVICES <br /> r G <br /> r' SAN JOAQUIN COUNTY { <br /> IOGI KHANNA A1.1)„M111 <br /> Health Officer P <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) 0 Stockton, California 9520I <br /> (209) 468-3400 <br /> Q <br /> STEPHEN POA <br /> MOBIL OIL CORPORATION A <br /> 3800 W ALAMEDA AVE AN 0.8 1991 <br /> SUITE 2000 <br /> BURBANK CA 91505-4331 <br /> RE: Mobil Bulk Plant IN REPLY REFER TO SITE CODE: 1968 <br /> 500 East Grant Line Rd. <br /> Tracy, CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division has completed review of the Problem Assessment Report <br /> (PAR) dated September 30, 1991 prepared by Alton Geoscience. The <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) has <br /> also reviewed documents including the PHS/EHD letter dated <br /> September 5, 1991, though excluding the recently submitted PAR. <br /> The CVRWQCB comment letter dated September 17, 1991 is enclosed for <br /> your information. A copy of the CVRWQCB comments was faxed to <br /> Alton Geoscience September 30, 1991. <br /> PHS/EHD comments are as follow: <br /> In July 1990 approximately 5, 080 cubic yards were excavated from <br /> Sections A,B,C,D, and F as referenced in Figure 4 included in the <br /> Soil Excavation and Preliminary Groundwater Investigation Report <br /> dated December 14, 1990, prepared by Alton Geoscience. Soil <br /> samples from these sections were used to determine the disposition <br /> of the excavated soil. <br /> Significant soil contamination was noted at the 5-10 foot level. <br /> The excavation stopped at 10 feet due to water intrusion. It is <br /> PHS/EHD understandings that no subsequent sampling of the <br /> excavation occurred. Therefore sidewall or bottom samples which <br /> were requested by the CVRWQCB letter dated September 17, 1991 cannot <br /> be provided. The significant soil contamination noted in the <br /> northern part of the site may not have been contained within the <br /> confines of the excavation. <br /> A Division or San Joaquin Count} Hcahh Care Services �� <br />