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GLIV Petroleum Tanker Spill Response,S,._-xcavation,and Confirmation Soil Sampling Result Re,_c � � Williams Tank Lines Fuel Tanker Spill,22934 E.Mariposa Road,Escalon,California 413 f3 Page 4 L WIRONMENTAL WMAITH DEPARTMENT Analysis Abbreviation Designation USEPA Method No. Total Petroleum TPHgGas-Range Hydrocarbons as Gasoline Hydrocarbons Benzene Toluene Aromatic Eth (benzene BTEX Volatile Xylenes (Total) Organics 82606 Tertiary Butyl Alcohol TBA Methyl Tertiary Butyl Ether MTBE Five Fuel Di-isopropyl Ether DIPE Oxygenates Ethyl Tertiary Butyl Ether ETBE Tertiary Amyl Methyl Ether TAME All excavated soil was temporarily stockpiled on-site pending characterization for disposal purposes. Copies of the laboratory analytical reports and COCs forms are included as Appendix B. SOIL EXCAVATION SAMPLING RESULTS According to laboratory analytical results, TPHg was reported in the samples collected from the south wall at EXS-1 and EXS-3 at concentrations of 1.2 and 1.9 milligram per kilogram (mg/kg), respectively. TPHg was also reported in the samples collected from the bottom of the excavation pit at EXB-1 and EXB-2 at concentrations of 1.0 and 280 mg/kg, respectively. All other soil samples collected were reported below laboratory detection limits for TPHg. Soil analytical data is presented on Table 1. Apex created an isoconcentration map depicting TPHg remaining in the soil following the excavation to determine the mass remaining in the soil. An isoconcentration map was drawn using excavation samples collected from the sidewalls and bottom of the excavation pit. Based on the soil data from the subject site (Table 2) and the TPHg in Soil Isoconcentration Map (Figure 3), the extent of soil contamination remaining at the site is estimated at 1.7 gallons. SOIL STOCKPILE DISPOSAL Stockpiled soil was transported to Forward Landfill in Manteca, California for disposal by GCU Trucking on September 24, 2013. No soil remains stockpiled at the site. Copies of the non-hazardous waste manifests and disposal receipts are included as Appendix C. BACKFILLING ACTIVITIES Under the direction and supervision of Apex the entire excavation was backfilled. The soil used to backfill the excavation was purchased from Munn and Perkins, Inc. of Escalon, California.