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Addrttonal Site Assessment Report and Work Plan for Adddlonal Subsurface Investigatwn 7 <br /> The Southland Corporation,Store#19976,1399 N Main St,Manteca,Caldomia June 5,1998 <br />' unlikely that benzene and TPH-G have migrated vertically beneath the existing water table to depths <br /> Indicated In soil analytical results <br /> The presence of MTBE was detected by EPA method 8020 In soil borings GP-1, GP-2, GP-3 to a depth of <br /> 25 feet,40 feet,45 feet, respectively,however,MTBE was not detected by EPA method 8260 In the 3 <br /> geoprobe sod samples analyzed <br /> The extent of dissolved hydrocarbons beneath the site has not been defined,therefore, it Is proposed that <br /> three groundwater monitoring wells be Installed at the site to verify the vertical and lateral extent of <br /> dissolved hydrocarbons at the site In addition, a well search will be conducted to locate all water supply <br /> wells within 2,000 feet of the subject site Information for the well search will be collected at the <br /> Department of Water Resources and from the local municipal water supplier An attempt will be made to <br />' verify historical water table elevations beneath the site <br /> If,following three quarters of groundwater monitoring and sampling of the proposed wells, additional data <br /> Indicate that the plume is limited In extent, nearby(utilized)groundwater resources are likely not at risk, <br /> and/or site conditions are favorable for plume reduction by Intrinsic biodegradabon/natural attenuation,no <br /> further action or closure after a quantitative risk evaluation will be requested If additional data Indicates <br /> active remediation Is needed,a schedule for evaluation and Implementation will be forwarded to the <br /> SJCPHS The wells are scheduled to be Installed during the third quarter 1998 <br /> I <br /> 1 I, <br /> 19976nr rpt <br />' FLUOR DANIEL GTI <br />