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PUBLIC HEALTH SERVICESp�� N <br /> SAN JOAQUIN COUNTY r y <br /> JOGI KHANNA M.D.,M.P H. y < <br /> i <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avatue) • Stockton, California 95201 �, c0�f FOR�'Ar <br /> (209) 468-3400 1 <br /> tl <br /> CLINT ROGERS <br /> i <br /> CHEVRON USA INC <br /> P RA ,i. OCT 2 2 1992 <br /> SAN N RAMON ON CA 94583 - 0804 � ;� <br /> RE:, Chevron Service Station #9-1918Site;code: 1138 <br /> 45 East Harding Way' <br /> Stockton CA 95204 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> has completed review of your correspondence dated August 7, 1992 which included the <br /> Environmental Assessment Report" dated July 22, 1992 and was prepared by <br /> Groundwater Technology, Inc. PHS/EHD has the following comments for your <br /> consideration. <br /> ,y til <br /> Thank you for providing a more accurate site map locating the newly installedvapor .q <br /> extraction well and monitoring wells to scale. ;! t <br /> The report included the results of the second quarter groundwater monitoring"event. <br /> The groundwater gradient continued to be in the northeast direction. The results of <br /> groundwater sample analysis indicated that all wells, MW9, MW10, and MW11, which`i,� <br /> have'sufficient water to sample, contained detectible concentrations of petroleum <br /> hydrocarbons. The downgradient well, MW11, revealed the highest concentration of j <br /> benzene, 1500 ppb. Additional groundwater investigation to define the boundaries of ?� <br /> groundwater contamination, both on site and off site, will be necessary. <br /> The request for two additional quarters of monitoring prior to the submittal of the work <br /> plan,to further investigate groundwater contamination, is granted. PHS/EHD I,was on i{ <br /> site to witness the third quarter monitoring event, July 24, 1992, but has not yet receiv id <br /> e <br /> the third quarter monitoring report. The fourth quarter monitoring vent should be <br /> scheduled by October 23, 1992, with the subsequent monitoring report due within 45 days <br /> of the date of sampling. Please submit the work plan for additional soil and groundwater <br /> investigation with the fourth quarter monitoring report due December 30, 1992. 1 <br /> PHS/EHD has evaluated your request to remove the VETS system from this site, for the <br /> purpose of relocation to another Chevron site which has a greater need for the r� <br /> equipment. PHS/EHD does not have sufficient evidence at this time',to indicate that this <br /> site has been largely remediated. <br /> A Division of San Joaquin County Hrelth Care Sernca � 'f <br />