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7.4 Disposal of Soil <br /> Soil excavated 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 <br /> 1 <br /> 7.5 Installation of Vault Boxes and Remediation Piping <br /> Vault 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, wr 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 /> ' FMXDc9 Doc #A158WOL1 7 <br />