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Workplan for Underground Storage Tank Upgrade 4 Southland Store No 17334 4501 North Pershing Avenue,Stockton,California August 10, 1998 BTEX and TPH-G by EPA Methods 8015/8020 modified and the oxygenates TBA, MTBE, DIPE, ETBE, and TAME following EPA Method 8260 Groundwater Monitoring Well Abandonment Prior to the tank removal groundwater monitoring wells MW-1 and MW-1A will be destroyed following guidelines set forth in California Department of Water Resources Bulletins 74-81 and 74-90 for well destruction Permits for the well destruction will be applied for from the SJCPHS The casing of each well will be drilled out to total depth of the well borehole to remove all annulus material using truck- mounted drill rig equipped with 8-inch diameter hollow stem augers The resultant boreholes will be grouted with neat cement using a tremie pipe The wells will be destroyed to prevent possible damage which may occur during removal of the USTs and subsequent excavation All well-related materials, including well casings, well boxes, and associated concrete will be segregated from the well annulus material and transported to a local landfill Additional Site Assessment Following completion of the fuel system upgrade at the site, a work plan will be submitted to the SJCDEH for the installation of one dual-nested well near the source area to replace wells MW-1 and MW-1A An additional well may be installed to further characterize the downgradient extent of the dissolved hydrocarbon plume Installation of a downgradient well is proposed to be deferred until after two to three quarters of groundwater monitoring have been completed following underground storage tank upgrades, to evaluate if hydrocarbon source removal (replacement of the underground storage tanks) will stimulate natural attenuation of hydrocarbons downgradient from the source area Possible future well locations will be proposed to the SJCDEH separately • 17334SJC LTR FLUOR DANIEL GTI `A�