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PUBLIC HEALTH SERVICES * gip <br /> SAN JOAQUIN COUNTY W ,sa <br /> JOG[KHANNA M.D.,M.P.H. <br /> Health Officer ., (* <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,Califamia 95201 �cioae� <br /> (209)468-3400 <br /> STEPHEN POA (C(0 [py <br /> MOBIL OIL CORPORATION <br /> 3800 WEST ALAMEDA AVE SUITE 2000 QAN2 8 1993 <br /> BURBANK CA 91.505-4331 <br /> Re: Former Mobil Bulk Plant SITE CODE: 1968 <br /> 500 East Grant Line Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has completed review of the Sequoia Analytical letter dated January 8, 1993 and has the <br /> following comments for your consideration. <br /> Additional evaluation of the isolated peaks identified in chromatograms of samples <br /> collected November 26, 1991 and October 21, 1992 indicated that the peaks were not <br /> characteristic of common fuel patterns. <br /> In order to further characterize the peaks identified, please consider analyzing future <br /> samples using EPA method 8270 (semi-volatiles) in lieu of 8015M (TPH-diesel). <br /> PHS/EHD has been informed by Sequoia Analytical that 8270 separates the same <br /> components as 8015M; however, 8270 can identify the individual components unlike <br /> 8015M, because 8270 utilizes GC/MS for identification. <br /> If you have any questions, comments or wish to schedule a sampling inspection, please <br /> contact Mary Meays, REHS, of my staff at (209) 468-0337. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Offic <br /> urie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> LAC/MM/500EGL <br /> c: Elizabeth Thayer, CVRWQCB c: Jeff Scharff, Scharff and Greben <br /> c: Greg Schubert, Tracy Venture/Mark III c: Stephan Rosen, Alton Geoscience <br /> A Division of San Joaquin Counry Health rare Services �� <br />