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i <br /> 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 /> • Soils from all three borings screened with a PID. <br /> • Grab groundwater sampling from shallow borings to determine • Deleted from activity II,groundwater screening in this area <br /> lateral extent of contamination. included in workplan addendum. <br /> • Develop and sample new wells. <br /> Laboratory Analysis: <br /> • Grab groundwater samples submitted to a certified lab for analysis • Grab samples deleted (screening completed earlier in addendum <br /> for TPH,BTEX,and MTBE. Analyzed in a 24-hour TAT. activities) <br /> • Groundwater samples from completed wells also tested for TAME, <br /> RIPE,TBA,and ETBE. <br /> 3 to 4 soil samples per boring submitted to certified laboratory for <br /> testing for TPH&BTEX,MTBE,TAME,DIPE,TBA,and ETBE. <br /> Reporting <br /> Reporting combined with Activity III. Deleted from Activities II;one report to be submitted discussing all <br /> workplan and addendum activities at the completion of Activity III. <br /> Activity III—Upgradient Monitoring Well,if deemed necessary <br /> Prefield Activities: <br /> • Included in Activity I and II prefield activities. <br /> Field Activities: • Exact locations and depths of borings to be determined after CPT& <br /> • One shallow boring located north of former Disco tanks groundwater screening.A deep well may be added in this area,if <br /> continuously logged to a depth of 10 feet below groundwater table indicated by CPT and groundwater screening described in <br /> and converted into a shallow monitoring well. addendum. <br /> • Soils from boring screened with a PID. Soil samples to be collected, • Soil samples for analysis should be collected from historic high and <br /> if field monitoring indicates potential for contamination low ground water elevation equivalents and the top of the current <br /> groundwater table,preferably in clayey or silty strata and where <br /> field screening indicates elevated constituents may be present.. <br /> • Develop and sample new well. <br /> • Survey locations of all new monitoring wells after Activity III.. <br /> 6 <br />