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r.n . <br /> PUBLIC WEALTH SER�CES <br /> SAN JOAQUIN COUNTY <br /> �.•�cry <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor a P. O. Box 388 • Stockton, C <br /> 209/468-3420 <br /> BRETT HUNTER rT <br /> ENVIRONMENTAL ENGINEER. NOV <br /> CHEVRON USA 3 0 MS <br /> P 0 BOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Petrig Seed/Former Signal Oil #221-5 SITE CODE: 1039 <br /> 5431 Grant Line Road <br /> Tracy, CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the^"Itequest for Site Closure" dated September 22, 1995 and prepared <br /> by Groundwater Technology. PHS/EHD has prepared the following comments for your <br /> consideration <br /> The closure report included a brief site history indicating that the former underground storage <br /> tanks had been removed in 1978. Subsequently, numerous phases of investigation have <br /> ensued; including the drilling of seven soil borings, three of which were converted into <br /> monitoring wells. The extent of soil contamination is very Iimited. However, Groundwater <br /> Technology failed to estimate the volume and mass of residual soil contamination, which is <br /> necessary to recommend the site for closure. Groundwater contamination has not been <br /> confirmed after seven periodic sampling events. <br /> Please submit in addendum an estimate of the residual soil contamination and a corrected <br /> Table 2 summarizing all groundwater analytical results including the August 1995 sampling <br /> event, all trip blanks, and bailer blanks. The addendum should also include a work plan to <br /> destroy the monitoring wells. <br /> PHS/EHD looks forward to certification of this site for closure. If you have any questions, <br /> please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> wu6>— <br /> Mary Meays, Senior REHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> MM15431 GRAN <br /> cc: Elizabeth Thayer, CVRWQCB cc: Doug Enos, Burns Seed Company <br /> cc: Jason Fedota, GTI <br /> A Division of San Joaquin County Health Care Services <br />