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PUBLIC HEALTH SERVICES, oPp��N <br /> ).•cam .OG <br /> SAN JOAQUIN COL'NTY <br /> JOG] KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 S FOR <br /> (209) 468-3400 <br /> BRETT HUNTER \ I r <br /> ENVIRONMENTAL ENGINEER C i <br /> CHEVRON USA PRODUCTS COMPANY <br /> P O BOX 5004 VAR Q 799-^ <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Station #9-6171 SITE CODE: 1784 <br /> 6633 Pacific Avenue <br /> Stockton, CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> review of the "Quarterly Groundwater Sampling Report" dated January 15, 1993 and prepared by Sierra <br /> Environmental Services. PHS/EHD has the following comments for your consideration. <br /> Groundwater contamination was evidenced by samples collected from monitoring wells, MW2, MW3, <br /> MW4, MW5 and MW6 on December 17, 1992, with the highest levels detected in MW2. Additional <br /> groundwater investigation commenced on July 30, 1992 with the installation of MW6 to replace MW1 <br /> which had gone dry and was destroyed on July 31, 1992. <br /> Additional groundwater investigation will be necessary to define the plume of groundwater contamination. <br /> Please submit a work plan to continue the soil and groundwater contamination investigation by <br /> May 14, 1993. <br /> Once groundwater contamination has been defined a problem assessment report should be prepared <br /> exploring remedial alternatives. <br /> If you have any questions, comments or wish to schedule a site inspection, please contact <br /> Mary Meays, REHS, of my staff at (209) 468-0337. <br /> Jogi Khanna, M.D. :,P.H. <br /> Health Officer <br /> i <br /> Laurie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Wilbur H. Smith, Lincoln Properties, 374 Lincoln Center, Stockton CA 95207 <br /> c: Chris Bramer, Sierra Environmental <br /> A Division of San Joaquin Counnl Health rare tictvlCCS �� <br />