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Inon SM02 Associates <br /> ' 1433 North Market Boulevard •Sacramento California 95834-1943 + (916)928-3300• Fox(916)928-3341 <br /> D <br /> ~ September 14, 1994 <br /> 1 <br /> ' Ms Diane M Hinson <br /> San Joaquin County Public Health Services <br /> ' Environmental Health Division <br /> 445 North San Joaquin Street <br /> P O Box 388 <br /> ' Stockton, CA 95201 <br /> Subject ARCO Service Station No 760, located at 225 South Cherokee Lane, Lodi <br /> ' and ARCO Service Station No 548, located at 1612 Hammer Lane, <br /> Stockton, California <br /> ' Ms Hinson <br /> At the request of ARCO Products Company (ARCO), EMCON Associates (EMCON) has <br /> evaluated information/data gathered during site investigations conducted at ARCO service <br /> station No 760 (Lodi site) and No 548 (Stockton site) in an effort to prioritize which site <br /> warrants the next available San Joaquin County designated ARCO vapor extraction <br />' treatment unit The evaluation was requested by San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS/EHD) in the meeting held on August 9, <br />' 1994 at the office of PHS/EHD, and confirmed in PHS/EHD's letter dated August 29, <br /> 1994, stating further evaluation is necessary at each site to determine the site's <br /> prioritization to obtain the vapor extraction treatment unit The vapor extraction treatment <br />' unit has been purchased by ARCO and has been designated for remediation at ARCO <br /> sites located in San Joaquin County The treatment unit is currently being assembled and <br /> should be ready for delivery in the fourth quarter of 1994 <br />' The evaluation included calculating the total estimated hydrocarbon mass in soil, <br /> reviewing groundwater gradient and flow directions, estimating the permeability of <br />' subsurface materials containing hydrocarbons, and identifying water supply wells in the <br /> area Data used for the evaluation of the two ARCO sites consisted of boring logs, soil <br /> and groundwater laboratory results, cross sections, isoconcentration and flow direction <br />' maps, and a well survey This information was gathered from reports generated for <br /> ARCO, which have been previously submitted to PHS/EHD The results of the evaluation <br /> are presented below <br /> 1 <br /> 1 <br />