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Updated Corrective Action Plan—Tosco(76)Service Station No 11192, Stockton, Cahfomia <br /> June 26,2002 <br /> 4. The potential effects of residual contamination on nearby surface water, wetlands, and <br /> groundwater: <br /> In April of 2001, GR conducted a well search and SRS in the vicinity of the subject site The well <br /> search was conducted within a '/2-mile radius around the site Based on the available data supplied by <br /> the DWR, three municipal wells were identified within the '/2-mile radius of the study area, the closest <br /> well is located approximately 1,000 feet north-northwest of the site The depths of all three municipal <br /> wells were reported to exceed 550 feet bgs and contain screened intervals beginning at a minim-urn of <br /> 350 feet bgs The SRS was conducted within a 500-foot radius centered around the subject site The <br /> SRS involved distributing questionnaires to all residences and businesses within the study area, <br /> requesting information about potential groundwater receptors GR distributed 141 questionnaires via <br /> the U S Post Office and a total of 49 questionnaires (35%)were returned to GR None of the returned <br /> questionnaires identified the presence of a well within the SRS study area <br /> Based on the information presented in subsections 2 and 3 above, the potential effects of residual <br /> contamination on nearby surface water and wetlands is considered to be minimal However, based on <br /> the analytical results of the groundwater samples collected from the monitoring wells to date, the first <br /> aquifer beneath the site has been impacted by petroleum hydrocarbons Although GR has identified <br /> municipal wells that are potentially located downgradient from the site, the distance to the nearest <br /> municipal well (1,000 feet) and the screened interval depth (350 to X550 feet) make it unlikely that <br /> groundwater from beneath the site will reach the municipal well <br /> 14024508 8 <br />