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1 <br /> 74 Petroleum Hydrocarbons in Water in the Tank Cavity Excavation <br /> ' Laboratory analyses of the water sample collected from the tank cavity excavation indicated <br /> TPH-G at a concentration of 9,900 µg/L (ppb), and BTEX at concentrations of 1,1-60, 560; 79, <br /> ' and 1,400 µg/L, respectively The laboratory analytical report for the water sample is included <br /> in Appendix B <br /> 75 Disposal of Soil and Water <br /> ' Soil generated during tank replacement activities was stockpiled on-site and sampled. Soil <br /> ' stockpiles containing less than 100 mg/kg TPH-G were transported to the BFI Class III landfill <br /> in Livermore, California (BFI) for disposal Soil stockpiles containing concentrations greater <br /> ' than 100 mg/kg TPH-G were aerated on-site and re-sampled Once the concentrations of TPH-G <br /> were reduced to less than 100 mg/kg the aerated soil stockpiles were transported to BFI for <br /> disposal. Water pumped from the tank cavity excavations was transported to the Gibson Oil <br /> Facility in Redwood City, California, for disposal <br /> ' 7.6 Installation of Vault Boxes and Remediation Piping <br /> tVault boxes and horizontal piping associated with the future remediation system for this Site <br /> were installed concurrently with the installation of the new product tanks and piping Ground <br /> ' water extraction, air sparging, and vapor extraction piping was installed in subsurface trenches <br /> from existing and proposed well locations to the proposed remediation compound (Figure 4). <br /> 1 <br /> 1 <br /> i <br /> ' 10 Doc #Ar59w01 17 <br />