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Workplan for Underground Storage Tank Upgrade 3 <br /> Southland Store No 20632,4627 DaV1nci Drive Stockton,California August 10, 1998 <br /> observation of the San Joaquin County Public Health Services Environmental Health Division <br /> (SJCEHD) Samples will be analyzed for BTEX and TPH-G by EPA methods 801518020, the <br /> oxygenates TBA, MTBE, DIPS, ETRE, TAME by EPA method 8260, and total lead by EPA Method <br /> 6010 <br /> Following removal of the existing USTs at the site, construction activity will begin to install the new USTs <br /> and dispenser island at the site The existing tank pit will extend slightly to the west to accomodate the <br /> two new tanks The dispensers will be placed slightly to the southwest of the existing fuel dispensers <br /> An additional approximately 150 cubic yards of soil will be generated during the excavation of the new <br /> tank pit The soil will be stockpiled on site and sampled for proper characterization The stockpiled sod <br /> will either be transported from the site by a licensed waste hauler to an appropriate disposal facility or <br /> used as backfill material <br /> Future Activities at the Site <br /> A well search will be conducted to locate all water supply wells within a 2,000-foot radius of the site <br /> . Information will be reviewed at the Department of Water Resources In Sacramento, California and the <br /> local municipal water supply company A door-to-door well search maybe conducted if deemed <br /> necessary One well will be installed near the existing tank pit to replace well MW-4 <br /> The replacement of the existing tanks and associated fuel dispensers will effectively remove the source <br /> of hydrocarbons at the site It is proposed that the current monitoring well system be used to monitor <br /> dissolved hydrocarbons beneath the site If, after two quarters of monitoring and sampling following <br /> removal of the existing USTs, hydrocarbon and oxygenate concentrations decrease in the off-site and <br /> on-site monitoring wells and if no water supply wells are found to be in hydraulic communication with <br /> the existing monitoring wells, site closure will be proposed If hydrocarbon and MTBE concentrations <br /> do not decrease, further plume delineation and active remediation may be required <br /> 20632EXE LTR <br /> FLUOR DANIEL GTI <br /> C•1 <br />