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DISCO PROPERTY,STOCKTON,CALIFORNIA <br /> Table 1 Summary of 1997 Workplan for Disco Property and Addendum Modifications and Additions <br /> 1997 Workplan Activities 1998 Addendum Modifications/Additions <br /> Conduct CPT logging at ten locations on approximately 100 foot centers <br /> to depths of up to 150 feet. <br /> Conduct expedited groundwater screening at three locations using a <br /> Hydropunch or similar sampling method to delineate depth and <br /> upgradient and downgradient lateral extent of groundwater <br /> contamination prior to drilling borings and installing additional wells. <br /> Prepare a report summarizing results of CPT and groundwater f <br /> screening and recommending modifications,as needed,to the 1997 l <br /> Workplan with respect to the proposed locations and depths of <br /> additional borings and monitoring wells. <br /> Activity I—Pump Island Area <br /> Prefield Activities: <br /> • Regrade pump island area to minimize surface water ponding <br /> • Obtain necessary permits <br /> • Clear utilities <br /> Field Activities: Exact locations and depths of borings to be determined after CPT& <br /> • Two shallow borings SB97-1 and SB97-2 continuously logged to a groundwater screening. <br /> depth of 10 feet below groundwater table.One of these converted <br /> into shallow monitoring well MW-11S. <br /> • One deep boring SB97-3 continuously logged to a depth Depth to be determined by groundwater screening described in <br /> immediately below the vertical extent of contamination. Convert workplan addendum. This boring may be continuously cored,if the <br /> boring into deep monitoring well MW-111). CPT is unable to advance to 150 feet bgs. <br /> • Soils from all three borings screened with a PID and field tested for Soil samples for analysis should be collected from historic high and low <br /> TPH-gas.3 to 4 soil samples from separate lithologic units in each ground water elevation equivalents and the top of the current <br /> boring selected for laboratory analysis. Samples selected based on groundwater table,preferably in clayey or silty strata and where field <br /> field screening data. screening indicates elevated constituents may be present. <br /> • Grab groundwater sampling from SB97-3 to determine depth of Deleted from Activity I and included in addendum for groundwater <br /> contamination. screening. <br /> 4 <br />