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ARCADIS GERAGHTY&MILLER <br /> information related to the soil and groundwater conditions beneath this former service <br />' station were not obtained during the ESA <br />' To further assess on-site and off-site subsurface conditions, GSI installed three <br /> additional on-site groundwater monitoring wells (U-4 through U-6) and two off-site <br /> groundwater monitoring wells (U-7 and U-8), drilled two additional on-site exploratory <br /> soil borings (U-N and U-O), and installed one on-site vapor extraction well (UV-1) in <br /> August 1995 TPHg or benzene were not detected in soil samples collected from bonngs <br /> U-5 through U-7 or U-O TPHg was detected in the soil sample collected from boring U- <br /> N at 25 feet bgs (1 7 mg/kg) TPHg and benzene were detected in the soil sample <br />' collected from well boring U-4 at 10 feet bgs (41 and 0 011 mg/kg, respectively) TPHg <br /> was detected in the three soil samples collected from well boring UV-1 at 25, 35, and 40 <br /> feet bgs at concentrations ranging from 3,400 to 20,000 mg/kg Benzene was detected in <br /> the soil samples collected at 35 feet (99 mg/kg) and 40 feet bgs (15 mg/kg) in boring UV- <br />' 1 Drilling and well mstallation data are presented in GSI's Well Installation And Soil <br /> Boring Report(No 4827 04-3), dated October 9, 1995 <br /> B subsurface Based n h o the subsu ace data gathered to date, a Soil Remediation Feasibility <br />' Study Work Plan (GSI Report No 4827 05-1, April 30, 1996) was prepared that <br /> proposed a vapor extraction test (VET) to evaluate whether soil vapor extraction was a <br />' possible remedial alternative at this site This Work Plan has not been implemented due to <br /> rising groundwater winch submerged the impacted soil targeted for inclusion in the <br /> Feasibility Study <br /> In May 1997, GSI conducted a search of Department of Water Resources files in <br /> Sacramento, California for domestic and municipal supply wells located within a 0 5-mile <br /> radius of the subject site GSI identified twelve sites with wells within the area searched <br /> Six sites were identified as domestic water supply wells, four sites as municipal water <br /> 7 <br />