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16 REPORT ON ADDITIONAL SITE ASSESSMENT AND RECOMMENDATIONS 7 <br /> 7-Eleven Store No 14117,2725 Country Club Blvd,Stockton, CA December 12,2001 <br /> Additional monitoring well installation is not recommended at this time, but may be Indicated by future <br /> data as plume delineation (or possible comingling with other plumes) east and northeast of the <br /> underground storage tanks at the site has not been determined However, a vadose-zone well may <br /> need to be installed to about 12 feet below grade in the former underground storage tank pit area to <br /> facilitate vapor extraction from the current and former tank pits,which overlap and are both backfilled <br /> with permeable soils (in contrast with low-permeability native soil types) <br /> 1 <br /> I 1 <br />