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r <br /> Mr Paul Supple Project 20805-140 003 <br /> April 30, 1998 <br /> Page 9 <br /> Soil and fill material removed from the gasoline UST complex (SP-1 and SP-3) were <br /> characterized and used to backfill the cavity at depths between 4 and 12 feet below grade <br /> Soil and fill material removed from the former waste oil UST location (SP-1) were <br /> characterized and transported to TPS for treatment and disposal <br /> Soil samples collected in the vicinity of the former dispenser islands and the two sets of <br /> product delivery piping contained detected TPHG concentrations of 13 to 12 mg/kg at <br /> depths of 3 to 4 feet <br /> Excavation backfilling activities were completed on March 3, 1998, and the former UST <br /> complex, dispenser areas, and product delivery piping areas were resurfaced <br /> Additional site assessment activities are proposed, including one additional <br /> dual-completion air sparge/vapor extraction well and two air sparge wells The additional <br /> vapor extraction well will supplement the existing vapor extraction well network and will <br /> provide coverage of the former UST complex Air sparge wells will be used in <br /> groundwater remediation Furthermore, well MW-3 will be properly abandoned due to <br /> eminent domain proceedings associated with the widening of Hammer Lane by the City of <br /> Stockton The well will be abandoned by drilling out the borehole to a depth of <br /> approximately 70 feet bgs A detailed workplan will be prepared and submitted to the <br /> SJCPHS for review and approval prior to conducting drilling activities <br /> DOCUMENT DISTRIBUTION <br /> We recommend copies of this report be distributed to the following <br /> Mike Infuma. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> Pat Carter <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> SAC�N'%PJ"80M051400 3FS-98\pzusmerI � Qg <br />