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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> �o.ti !•.e G Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Bor an,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor <br /> Director <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S, <br /> ZrFbw Laurie A.Cotulla,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClelloo,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> PAUL VERMA MAY <br /> i <br /> CITY OF TRACY 2003 <br /> 520 TRACY BLVD <br /> TRACY CA 95376 <br /> RE: Boyd Service Center SITE CODE: 1421 <br /> 560 Tracy Blvd. <br /> Tracy CA 95376 <br /> San Joaquin County Environmental Health Department(SJC/EHD) has reviewed"Soil and <br /> Groundwater Initial Site Assessment", dated April 7, 2003, submitted on your behalf by Wright <br /> Environmental Services, Inc. and has the following comments. <br /> The report documents site fieldwork that took place in February 2003. Six direct push soil borings <br /> were advanced onsite; soil and grab groundwater samples were collected for analysis. Petroleum <br /> hydrocarbon contamination was observed in the borings near the former tank pit, including what <br /> appeared to be free product motor oil. Laboratory analytical results reported bunker oil <br /> contamination in all six water samples, as well as total petroleum hydrocarbons and fuel <br /> oxygenates in the water samples collected near and down gradient to the former tank pit and <br /> dispenser island areas. <br /> The report recommends the installation of additional exploratory soil borings to define the extent of <br /> the dissolved plume, and the installation of groundwater monitoring wells to begin routine <br /> groundwater monitoring. SJC/EHD agrees with these recommendations. You are directed to <br /> submit a work plan to continue the investigation of the vertical and lateral extent, in both soil and <br /> groundwater, of the documented contamination at this site, and to install groundwater monitoring <br /> wells. The work plan must include an assessment and mitigation pian for addressing the free <br /> product motor oil observed during the initial investigation. The work plan is due by June 30, 2003. <br /> A sensitive receptor/well survey must be completed that documents all municipal, domestic, <br /> agricultural, industrial and other wells located within 2000 feet of the site. Wright has identified a <br /> municipal water supply well located approximately 1000 feet north of the site. Construction details <br /> of this well, and all other wells identified, if available, must be included in the survey. The water <br /> produced by the municipal supply well must be sampled and analyzed for petroleum hydrocarbon <br /> constituents. The well survey is due June 30, 2003. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> r <br /> c.VIA <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James L.L. Barton, CVRWQCB <br /> John Lynch,Wright Environmental <br />