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' Workplan for Additional Offsite Assessment, Fate and Transport Evaluation Addendum, g <br /> Sensitive Receptor Survey,and Fourth Quarter 2002 Monitoring And Sampling <br /> 7-Eleven Store No 14117,2725 Country Club Blvd, Stockton,CA January 30 2003 <br /> Regional dissolved plume delineation for MTBE north and east of the 7-Eleven site Is generally <br /> determined by data from Exxon well MW-7 and other wells on/near the Exxon site An additional <br /> monitoring well and soil boring are proposed for installation to 50 feet bg In the eastern part of the site to <br /> ' amplify vertical plume delineation and resolution of the eastern plume margin Data from the adjacent <br /> Exxon site do not suggest a high degree of plume commingling between the two sites, and modeling <br /> 1 results indicate that the general distribution of the 7-Eleven groundwater plume Is stable and likely to <br /> remain restricted to the Immediate source area A 2,000-foot door-to-door sensitive receptor survey <br /> Implemented for the adjacent Exxon site places known private wells outside the extent of the northern and <br /> ' western 7-Eleven plume edge as currently delineated <br /> Additional assessment Is proposed to commence concurrent with SJCPHS review and approval of this <br /> document Remediation at the site Is recommended to commence within 30 to 60 days of SJCPHS <br /> concurrence with the proposed CAP <br /> 1 <br /> 1 <br /> i <br /> 1 <br /> 1 <br /> 14117Q24 SAR doc <br />