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• • limit (LEL). The piping will then be transported to Erickson's facility in Richmond, California, where it will be cleaned and cut up for scrap. C3.4 Task 4 - Removal and Disposal of Tank and Contents The UST will be inspected for the presence of residual diesel fuel that was once stored in the tank. If present, a sample of the tank contents may be collected from the tank to provide information for proper handling and disposal of the liquid. A vacuum truck will be used to pump liquid and residues from the UST. The vacuum truck electrical ground will be bonded to the tank as well as to a ground-rod. Procedures associated with content removal are provided in the QC Program of the GMP under Sections B4.3.3 (Exposing Tank And Piping, Gravity Draining Piping), B4.3.4 (Sampling, Removal, and Disposal of Tank Contents), and 84.3.5 (Gravity Draining Tanks). The San Joaquin County Department of Public Health will be given 48 hours notice before pulling the tank. Following removal of the tank contents, all appurtenances will be removed and capped, except those necessary to purge the tank. The tank will be inerted by using at least 10 pounds of dry ice per 500 gallons of tank volume. Following introduction of the dry ice, the total area of all openings will be limited to 100 square inches. Remote venting of tank vapors, monitoring of tank atmosphere and other procedures associated with inerting of UST are provided in the QC Program of the GMP under Sections B4.3.6 (Tank Inerting Procedures). The UST will be excavated using a track-mounted excavator or a wheeled backhoe. The perimeter of the tank will be excavated in a manner that minimizes the area of excavation and limits the amount of potentially contaminated soil that may be mixed with uncontaminated soil. Soil from above, below and around the tank will be field screened and stored in separate uncontaminated and contaminated stockpiles. Field screening will include visual inspection and use of a photoionization detector (PID) for volatile organic compounds (VOCs). During excavation, soil that has a strong organic or chemical odor, is visibly stained, or displays a high reading (greater than 10 ppm) on the PID will be stockpiled separately. Final determination of contamination will be based on sample analysis. Additional details on tank excavation procedures are provided in the QC Program of the GMP. The UST will be removed using a backhoe and placed on the ground. All loose dirt will be removed so that it will not be inadvertently lost during transport and to allow close inspection. The tank will be visually inspected for excessive corrosion or holes that would indicate a possible leak. If a leak is discovered, the COR will be immediately notified. After inspection, the tank will be loaded onto the truck for disposal. The UST and contents will be hauled by Erickson to Erickson's facility in Richmond for • scrap, and the tank contents to Gibson Environmental in Redwood City for disposal. Wastes will be transported under manifests in accordance with federal, State, and local C-5