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• Mr Paul Supple Project 20805-140 003 <br /> April 30, 1998 <br /> Page 8 <br /> Stockpile sample SP-3-A contained TPHG, benzene, and MTBE concentrations of <br /> 29, 0 01, and 0 0067 mg/kg, respectively, and sample SP-3-B contained TPHG and <br /> benzene concentrations of 96 and 0 60, respectively MTBE was below method reporting <br /> limits for sample SP-3-B Oxygenates did not exceed method reporting Units in any of <br /> the stockpile samples <br /> Stockpile soil sample analytical results are presented on Table 2 The appendix contains <br /> copies of certified analytical reports and chain-of-custody documents <br /> EXCAVATION BACKFILL PROCEDURES <br /> Henderson backfilled the UST excavations on February 11 and 12, 1998 Native soils <br /> and backfill material excavated from the former gasoline UST complex and product line <br /> trenches were used to backfill the gasoline UST complex to within approximately 4 feet <br /> of surface grade Clean, imported soil was used to backfill the former waste oil UST <br /> excavation <br /> Additional soil unported to replace the UST volume was placed as backfill on <br /> March 3, 1998 The imported soils were placed to within 1 foot of grade, and A/B was <br /> imported and placed for the asphalt base After backfilling activities concluded, <br /> Henderson placed an asphalt cap over the area <br /> Soil Disposal <br /> Approximately 11 cubic yards of soil excavated from the former waste oil UST location <br /> was removed from the site Dillard Trucking transported the soil to TPS, located in <br /> Richmond, California, for treatment and disposal <br /> CONCLUSIONS <br /> Petroleum hydrocarbon impacts are present along the base of the former gasoline UST <br /> complex (16 feet bgs) Confirmation soil samples indicate the impacts are located 1n the <br /> northeastern and central southern part of the former gasoline UST complex (T-2-N, <br /> T-3-S, T-3-N, and T-4-N) Detected TPHG concentrations range from 750 to <br /> 8,200 mg/kg Soil samples collected from the northwestern, southwestern, and <br /> southeastern corners of the former gasoline UST complex did not contain TPHG at <br /> concentrations exceeding method reporting limits (T-1-N, T-1-S, T-2-S, and T-4-S) <br /> SACW\PJM805\08051400 3FS-Wpzusmer 1 �Cctct�lC� <br />