REMOVAL 2002 CLOSURE IN PLACE - Laserfiche WebLink

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r SKF 21 August 2002 Dennis H. Catanyag San Joaquin County ' Environmental Health Department Page 3 1 and 2). The turbine is the primary piece of process equipment at the facility responsible ' for converting steam energy to electricity. POSDEF personnel are reluctant to attempt excavating the tank because digging near the support column may result in differential settlement that could cause the turbine to vibrate or become misalign. In-place closure of the tank is proposed to avoid these potential situations that would be disastrous to POSDEF's operations. INABILITY TO PERFORM FURTHER SAMPLING To allow in-place closure of an underground storage tank, EHD typically requires that soil samples beneath each end of a tank be collected from slant borings. As shown on ' Figure 4, the 1,000-gallon used oil underground storage tank at the POSDEF facility is located with a berm that is congested with aboveground piping. Available space is insufficient to maneuver drilling equipment near the tank. Further, the existence of pea ' gravel around the tank suggests it is not feasible to complete slant borings with a hand auger into native soil beneath the tank because the gravel will likely cause the borings to collapse. The inability to keep the boring open is probably the reason why Wright was only able to collect samples of pea gravel for laboratory analysis. Although POSDEF agrees it would be desirable to obtain samples of native soil beneath ' the tank, collection of such samples is not imperative to demonstrate the tank has not leaked. The evaluation of tank integrity and characterization of environmental conditions completed in 1998 when the tank was last used confirm that a significant release of oil ' from the tank did not occur. ' PROPOSED ACTIONS TO COMPLETE IN-PLACE CLOSURE OF TANK Upon receiving EHD concurrence that the 1,000-gallon used oil underground storage ' tank can be closed in-place without further sampling, POSDEF will submit the necessary paperwork to secure official permission to close the tank in-place. Such paperwork will include EHD's standard application forms entitled Closure In Place and Application for Permit to Close Underground Storage Tanks Storing Hazardous Materials. After the applications have been approved, POSDEF will retain a contractor to fill the tank with a solid, inert material that meets with the approval of EHD. POSDEF will submit required I documentation to EHD pertaining to the actual in-place closure of the tank. This documentation will include the underground storage tank tracking record sheet, tank closure certification form, and hazardous waste manifests, as appropriate.