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PUBLY HEALTH SEWICES �Op'�u'N•.CD <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA 141.D.,bt.P.H. <br /> Health Officer <br /> oq <br /> P.O. Box 2009 0 (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 468-3400 <br /> CUNT ROGERS <br /> CHEVRON USA <br /> P O sox 5004 ( <br /> , ,,' J U L 1 7 1991 <br /> SAN RAMON CA 94583-0804 'y <br /> Re: Ron's Chevron #9-0557 SITE CODE 1039 <br /> 139 South Center <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> review of the "Quarterly Monitoring Report" dated May 14, 1992 and prepared by Groundwater <br /> Technology. PHS/EHD also reviewed historic documents pertaining to this site, conducted a site <br /> inspection July 7, 1992 and has the following comments for your consideration. <br /> Four underground storage tanks were removed April 5, 1990. Subsequently, a limited re-excavation was <br /> attempted to removed contaminated soil. Residual soil contamination remains as a source of <br /> contamination to groundwater and should be addressed in the problem assessment report prepared at the <br /> conclusion of the investigation defining the extent of groundwater contamination. A number of stockpiles <br /> resulted from the re-excavation attempt,some of which were contaminated. PHS/EHD never received a <br /> report documenting the re-excavation or soil disposal. Please submit stockpile disposal documentation <br /> within the next quarterly report. <br /> PHS/EHD agrees that additional monitoring wells are necessary to define the extent of groundwater <br /> contamination. PHS/EHD conducted a site inspection to consider the proposed placement of MW5 <br /> downgradient of MW2. The proposed location of MW5 appeared adequate. Also, PHS/EHD recommends <br /> evaluation of an additional monitoring well, downgradient of MWI. PHS/EHD has contacted the <br /> City of Stockton and determined that such a monitoring well could be installed in Washington Street. <br /> Negotiations with Cal Trans and the COS to obtain encroachment permits should be initiated for the <br /> installation of MW5. Please submit a work plan and a PHS/EHD permit application for further <br /> investigation of groundwater contamination by August 24, 1992. <br /> If you have any questions or to schedule a site inspection, please contact Mary Meays, REHS, of my staff <br /> at (209)468-0337. <br /> Jogi Khanna,>M.,M.P.H. <br /> Health O <br /> rie A. Cotulla, , Program anager <br /> i <br /> Environmental Health Division <br /> LACftv[M:lb <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Van Hartnitt, Greyhound Lines,901 Main Street, Suite 2400, Dallas TX 75202 <br /> c: Jim Grasty, GTI <br /> A Division of San Joaquin County Health rare Services 10 <br />