REMOVAL_1994 - Laserfiche WebLink

Home Browse Search

2.0 UNDERGROUND STORAGE TANK REMOVAL On November 16, 1994, Brandon Construction coordinated the removal of the concrete pad above the UST, the UST piping, and the backfill material overlying the UST. This material was stockpiled in an area north of the excavation until composite samples were taken confirming contaminant concentration in the pile. The pile was then relocated to the north comer of the parking lot and placed on and covered with plastic sheeting. The removal was conducted under a permit issued by the San Joaquin County Department of Environmental Health (SJCDEH). The UST was removed by Brandon Construction on November 16, 1994. Regulatory oversight was provided by the SJCDEH representative Ms. L.T. Briggs. Upon removal of the overlying material from the tank, dry ice was introduced into the tank. The UST was removed when the Lower Explosive Limit (LEL) and Percent Oxygen met SJCDEH requirements, and the UST was deemed safe for removal. Upon removal, the UST and all associated piping was inspected for pits, holes, and cracks. No sign of degradation was seen in the UST and associated piping. The UST and all associated piping was transported by Erickson, Inc. to their facility in Richmond, California under Hazardous Waste Manifest No. 93231286 (Appendix A). Triple rinsing of the UST was not necessary because it contained diesel fuel and it was shipped as hazardous. 2.1 Soil Sample Collection from Excavation �- Approximately 20 cubic yards of soil and pea gravel overburden were removed prior to the UST removal. Once the tank had been removed from the excavation, an additional 21 cubic yards of soil was removed from the excavation. Versar collected two discrete soil samples, one from each end of the previous tank location, from the excavation following the removal of the reenforced concrete pad at the bottom of the excavation. Two composited soil samples were collected for analysis from the stockpiled soil excavated during the tank removal. All samples were collected in accordance with SJCDEH Regulations and the "Tri-Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of �. 2