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Underground Storage Tank Removal Report and Wait Plan for Additional Site Investigation 3 Southland Store#14117 2725 CountEy Club Boulevard Stockton CallfomEa September 29 1 ggg modified and the oxygenates TBA, MTBE, DIPE, ETBE, and TAME by EPA method 8260 In addition, one sample (1W-W)was analyzed for total lead by EPA method 6010 3.2 Results of the Soil and Groundwater Sample Analysts Laboratory analytical results of soil and groundwater samples collected July 17, 1998 are summarized in Table 1, and copies of the analytical data are included in Appendix C ' The highest benzene and TPH-G concentrations in the soil were detected in sample TC-2-14' p , ' collected beneath the south end of the center UST, at 63 milligrams per kilogram (mg/kg) and 7,200 mg/kg, respectively The highest MTBE concentration in sod by EPA 8260 were detected in sample TW-2-14', collected beneath the south end of the western UST, at 40 mg/kg TAME was detected in sample TW-2.14' ata concentration of 2 mg/kg TBA, DIPE, ETBE, and total lead were not detected in the samples analyzed The highest dissolved benzene and TPH-G concentrations in groundwater were detected in sample TW-W collected beneath the western UST at 5,000 micrograms per liter (pg/L) and 140,000 jug/L, respectively The highest MTBE, TBA, and TAME concentrations in groundwater were detected in sample TW-W at 68,000 pg/L, 23,000 pg/t., and 1,200 pg/L, respectively Total lead was also detected in sample TW-W at a concentration of 0 82 milligrams per liter(mg/L) DIPE and ETBE were not detected in the three analyzed groundwater samples 4 0 TANK PIT EXCAVATIONIBACKFILLING!DEWATERING 1 4 1 Tank Pit Excavation and Backfilling ' Following removal for the three 10,000-gallon USTs the tank it w p as excavated to a depth of 14 feet BGS generating approximately 40 cubic yards of soil The soil was stockpiled on site pending characterization and disposal The additional 40 cubic yards of soil was removed from the floor of the tank pit excavation for compaction purposes and to allow for the placement of coarse gravel fill ' material The tank pit excavation was backfilled with gravel from 14 feet BGS to 9 feet BGS and with sod from the new tank pit excavation from 9 feet to 2 feet BGS 14117usi rpt FLUOR DANIEL GTI