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URS �F1�11ECE[�����D <br /> t 2Dos <br /> EN"I/IiuNAAENT HEALTH <br /> PERIA'TISERVICES <br /> February 16, 2006 <br /> Mr Mike Infurna, Senior REHS 06020 <br /> San Joaquin County Environmental Health Department 06 a3 <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202-2708 <br /> Re: Site Closure Report <br /> ARCO Service Station 6020 <br /> 1711 East Yosemite Avenue,Manteca, California <br /> Dear Mr Infurna <br /> URS Corporation Americas (URS), on behalf of Atlantic Richfield Company (ARCO — a BP-affiliated <br /> company), has prepared this site closure report for the ARCO Service Station No 6020 located at 1711 <br /> East Yoserrnte Avenue, Manteca, California (site) <br /> This closure report has been prepared in response to a telephone conversation with you on January 25, <br /> lie 2006 The following pages present the site background with assessment activities and findings, remedial <br /> action summary, contaminant mass remaining and distribution, sensitive receptors, and conclusions and <br /> recommendations <br /> SITE BACKGROUND <br /> The site is located at 1711 East Yosemite Avenue in Manteca, California (Figure 1) The site is <br /> currently operating as a gasoline station with AM/PM mini mart Site structures include three double- <br /> walled fiberglass underground storage tanks (USTs), one 12,000-gallon UST and two 15, 000-gallon <br /> USTs, with associated piping and two dispenser islands (Figure 2) <br /> Previous Investigations <br /> In 1996, ARCO was granted case closure at this site by SJCEHD and subsequently destroyed four on- <br /> site groundwater monitoring wells (MW-1 through MW-4) <br /> Three gasoline USTs and associated product lines and dispensers were removed from the site in April of <br /> 1999 Petroleum hydrocarbon impacts to soil were documented in the UST pit, dispenser, and piping <br />` samples (Attachment A) The highest concentrations of gasoline-related compounds were reported in <br />!r soil samples collected beneath the dispenser islands Soils were over-excavated to a maximum depth of <br /> 7 feet below ground surface (bgs) beneath the dispenser islands and 17 feet bgs beneath the former <br /> USTs Total petroleum hydrocarbons as gasoline (TPHg) and methyl tert-butyl ether (MtBE) were <br /> SURS Corporation <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive, Suite 150 <br /> Sacramento CA 95833 <br /> Tel 916 679 2600 <br /> Fax 916 679 2900 K 1WprocessV5 SP ARCO\060201Closure RptslText 2_l6_06 doc <br />