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DISCO PROPERTY,STOCKTON,CALIFORNIA Table 1 Summary of 1997 Workplan for Disco Property and Addendum Modifications and Additions 1997 Workplan Activities 1998 Addendum Modifications/Additions • Develop and sample new wells. All new wells to be surveyed after completion of additional investigation, ; Laboratory Analysis: • Soil from distinct lithologic units in SB97-3 sampled and tested for May add undisturbed density and specific gravity for porosity permeability,dry bulk density,moisture,and TOC. determination. • 3 to 4 soil samples per boring submitted to certified laboratory for Additional analyses for gasoline additives MTBE,TAME,DIPE,ETBE, testing for TPH&BTEX. TBA. Reporting • Letter report summarizing findings of Activity I including boring logs, Deleted from Activity I;one report to be submitted discussing all tabulated laboratory results,and recommendations for Activities II and workplan and addendum activities at the completion of activity III. III Activity II-Downgradient of Former Disco Tanks Prefield Activities: Delete well survey update—already complete. • Update well survey • Clear utilities • Obtain drilling permits • Obtain encroachment permit from Caltrans Field Activities: • Exact locations and depths of borings to be determined after CPT& • Two to three or more shallow borings located south of Disco groundwater screening. property continuously logged to a depth of 10 feet below • Soil samples to be collected based on highest PID readings, groundwater table. One or two borings converted into shallow preferably in clayey or silty strata. monitoring wells. • One to two deep borings continuously logged in the vicinity of • One or more of these borings may be continuously cored,if the CPT shallow wells.One or both completed as monitoring wells screened is unable to advance to 150 feet bgs. same depth as MW-11D • Soil samples for analysis should be collected from historic high and low ground water elevation equivalents and the top of the current groundwater table,preferably in clayey or silty strata and where field screening indicates elevated constituents may be present. 5