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PUBLIC flEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DMSION ` <br /> Karen Furst, M.D., M.P.H., Health Officer ,�''' <br /> 304 East Weber Avenue, Third Floor• Stockton, CA 95202 <br /> 209/468-3420 F I L C "J "'Y <br /> MIKE KARVELOT <br /> QUIK STOP MARKETS INC JAN <br /> 4567 ENTERPROSE ST <br /> FREMONT CA 94538-7605 <br /> RE: Quik Stop Market #121 SITE CODE: 1430 <br /> 1196 W. Louise Ave. <br /> Manteca CA 95336 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the"Soil and Groundwater Investigation Report" dated <br /> November 1998 that was prepared by Compliance & Closure, Inc. (CCI) for the above <br /> referenced site, and has the following comments for your consideration. <br /> The report details field activities that took place on October 19 and 20, 1998. On those dates <br /> CCI oversaw the advancement of five direct-push soil borings for the purpose of collecting soil <br /> and grab ground water samples to begin the investigation of the vertical and lateral extent of <br /> hydrocarbon contamination at this site. Twenty-one soil samples and five water samples were <br /> collected. All samples were analyzed for total petroleum hydrocarbon as gas, (TPH-g); <br /> benzene, toluene, ethyl benzene, and xylene; and oxygenates, including methyl tertiary butyl <br /> ether, MTBE. Laboratory analysis results were non-detect for all constituents except: 5 parts <br /> per billion (ppb) toluene in soil sample GP-5-28'; 800 ppb TPHg, 8-ppb benzene and 73-ppb <br /> MTBE in water sample GP-IW; and 7-ppb MTBE in sample GP-2W. Please note that tabulated <br /> analytical results also show 5-ppb benzene in sample GP-3-16', though this is not substantiated <br /> by the analytical data from the lab. <br /> The report recommends the installation of three monitoring wells on site to determine the <br /> groundwater flow direction and to be able to initiate quarterly groundwater monitoring. <br /> PHS/EHD agrees with this recommendation. <br /> Please prepare a work plan for the installation of three groundwater monitoring wells at this site <br /> and submit it to PHS/EHD by March 8, 1999. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> L.cl;. Cl( <br /> Lori Duncan, REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> George Yamashita, c/o Jeffrey Widman <br /> Gary Mulkey, CCI <br /> A Division of San Joaquin County Health Care Services <br />