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ATC Associates Inc. <br /> VATC 1117 Lone Palm Avenue, Suite 201 <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> fax:209-579-2225 <br /> ASSOCIATES INC . <br /> December G°�E�C ED <br /> 54.62605.000 011 l� ll�l EK <br /> DEC 1 0 2007 r <br /> Ms. Vicky McCartney ENVIRONMENT HEALTH11- <br /> San Joaquin County PERMIT/SERVICES <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202-3029 <br /> Subject: Workplan for Soil Vapor Study at Former Thiemann's Service Station, 106 West <br /> Second Street, Ripon, California, Site 1479 <br /> Dear Ms. McCartney: <br /> ATC Associates Inc. (ATC) has prepared this workplan to conduct a soil vapor survey at the <br /> above referenced site. The purpose of the soil vapor survey is to evaluate the potential for vapor <br /> intrusion hazards from subsurface soil and/or groundwater beneath the site between the source <br /> area and nearby structures. This work was directed by the San Joaquin County Environmental <br /> Health Department (SJCEHD) through correspondence dated October 11, 2007. <br /> The scope of work includes installing six temporary soil vapor probes; analyses of soil vapor <br /> samples; comparing soil vapor analytical results to Environmental Screening Levels (ESLs) as <br /> provided by the Regional Water Quality Control Board (RWQCB) San Francisco Bay Region, <br /> and preparing an investigation report detailing site activities. The scope of work is described in <br /> detail in the following paragraphs. <br /> SITE LOCATION <br /> The site is located west of Stockton Street and south of West Second Street in Ripon, California, <br /> as shown on Figure 1. The location is a mixed commercial and residential area. The site is <br /> currently occupied by Leo's Auto Service. <br /> BACKGROUND <br /> In March 1991, three underground storage tanks (USTs) were removed from the site. Analyses <br /> of soil samples collected from the excavation indicated high concentrations of petroleum <br /> hydrocarbons were present in soil beneath the tanks. Groundwater was not encountered in the — <br /> excavation. The location of the former USTs are shown on Figure 2. <br /> In July 1993, a subsurface investigation was conducted at the site to determine the extent of <br /> petroleum hydrocarbons present in soil and to determine if groundwater had been impacted. The <br /> S:Environmental\62605\Reports\2007 November.doc I <br />