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URS October 11, 2004 OCT 1 5 2004 Ms g Rervisin orio Margaret La , Su EHS ENVIRONMI EIS I HEALTH 00760 g g Supervising Site Mitigation Unit PERMIT/SERVICES 06 a4 San Joaquin County Environmental Health Department 304 E Weber Avenue, Third Floor Stockton, CA 95202-2708 Re: Site Assessment Report and Workplan for Additional Assessment Former ARCO Service Station No. 760 225 S. Cherokee Lane Lodi, California �I ' Dear Ms Lagorio ' URS Corporation Americas (URS), on behalf of Atlantic Richfield Company (ARCO—a BP affiliated company),has prepared this report to document site assessment activities conducted in March 2004 and to present the workplan for additional assessment at former ARCO Service Station No 760, located at 225 S Cherokee Lane, Lodi, California(Figure 1) The assessment was conducted in response to a letter from the San Joaquin County Environmental Health Department (SJCEHD)dated November 17, 2003, which requests evaluation of the lateral and vertical extent of 1,2-dichloroethane (1,2-DCA) in the groundwater beneath the site Assessment activities were conducted in accordance with the soil and grab groundwater sampling scope of work described in the Workplan for Soil and Groundwater Assessment, submitted by URS on January 13, 2004, to the SJCEHD The workplan was approved on January 20, 2004, and a workplan addendum was i approved on February 24, 2004, which allowed for three sot] borings to be advanced instead of the four described in the original workplan Soil boring permits, correspondence from SJCEHD, and encroachment perrruts from the City of Lodi are included in Attachment A The following pages present t the site background, subsurface conditions, assessment activities and findings, and the workplan for additional assessment SITE BACKGROUND The site, located at 225 S Cherokee Lane in Lodi, California (Figure 1), was formerly operated as an ARCO gasoline station with an AM/PM mum-mart The site is bounded by an alley to the north, Lodi Avenue to the south, residential property to the west, and S Cherokee Lane to the east (Figure 2) As part of divestment activities, all USTs, dispensers, and associated piping were removed in August 2002 under URS supervision The site is currently operated as a used car dealership Analytical results of groundwater samples collected from three on-site monitoring wells between October 2002 and third quarter 2004 identified the presence of 1,2-DCA at the site The City operates municipal well #1R, which is 812 feet east of the site Total depth of well#1R is 395 feet below ground surface (bgs) and is screened from 150 to 395 feet bgs The well has an open bottom, is currently active, is operated continuously during the summer and approximately three days a week during the winter, and has a pumping rate of 1,100 gallons per minute ✓ URS Corporation Crown Corporate center 2870 Gateway Oaks Drive, Suite 300 Sacramento,CA 95833 Tel 916 679 2000 Fax 916 679 2900 K 1Wprocess\J5 BP ARCO\0076012004 Assessment1760 site assessment report with workplan V2 04 doc