REMOVAL_2001 - Laserfiche WebLink

Home Browse Search

2.0 UST Removal Field Activities 2.1 Tank Removal On January 4, 2001, Fuller began excavation activities by removing the concrete pad that covered the tank. The fuel conveyance piping was then disconnected from the UST and the building. The piping was observed to be in good condition without any holes or cracks. Fill material around the tank was excavated and placed on plastic adjacent to the tank excavation. No soil discoloration or petroleum hydrocarbon odors were observed during piping removal, nor was groundwater encountered. On January 5, 2001, the UST was triple rinsed by Ecology Control Industries (ECI) personnel using a fresh water/detergent mixture and a hot water pressure washer. Visual inspection of the tank did not indicate any residual sludge or liquid on the visible portions of the interior of the tank. Approximately 300 gallons of rinsate was removed from the tank using a vacuum truck. The rinsate was drummed and then transported for disposal, under manifest number 99552073, to Crosby and Overton in Long Beach, California. A copy of the manifest for the rinsate is included in Appendix B. The internal atmosphere of the tank was inerted with approximately 150 pounds of dry ice. Time was allowed for the dry ice to displace residual vapors within the tank before measuring the percent of the lower explosive limit and percent oxygen within the tank. Under the authorization of Mr. A.W. Sandman of the SJFD, the tank was removed from the excavation and prepared for off-site disposal. The tank was scraped of exterior soil and inspected for signs of deterioration, holes, or leakage. Holes, cracks, or other indications of leakage were not observed on the tank. The tank was loaded onto a flat-bed truck and transported for disposal by ECI to their facility in Richmond, California. The tank was transported as hazardous waste under Manifest No. 98383803. A copy of the manifest for transport and disposal of the tank is presented in Appendix C. 2.2 Sampling Activities On January 5, 2001, soil samples were collected from the tank excavation and from the pipeline trench, under the direction and supervision of Ms. Letitia Briggs of the SJCPHS-EHD. Soil samples PBTP-1 and PBTP-2 were collected from the west and east ends of the base of the tank excavation, respectively, at a depth of approximately 10.5 feet below grade, two feet below the CNCD\02-21-01\O:SHARE\US'IAO1-0012.doc 2