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Irk?, IF r (~ UNDERGROUND FUEL STORAC�TANK REMOVAL REPORT WIGGINS AND ASSOCIATES . 4555 PERSHING AVENUE STOCKTON, CALIFORNIA 1 0 INTRODUCTION On January 8, 1992, Jim Thorpe Oil Company (Thorpe), in conjunction with TreaTek Inc (TreaTek), closed by removal, three 12,000 gallon underground fuel storage tanks from the site located at 4555 Pershing Avenue in Stockton, California (Figure 1) The tanks, consisting of one diesel, one unleaded gasoline and one leaded gasoline, were removed in order to abandon the fuel service operations at the site This report presents a discussion of the activities involved with the removal of the tanks, the collection of soil samples to evaluate the amount of fuel residues from both the excavation bottom and the excavated stockpiles and the analytical results of the soil samples 2.0 TANK REMOVAL ACTIVITIES On January 6, 1992, preparations began for the removal of the three underground fuel storage tanks at the site The preparation activities consisted of the removal of the service island, piping, concrete and the removal of the asphalt area covering Once the area coverings (concrete and asphalt) were removed, the soils above the tanks were removed and stockpiled onsite The excavated soils were stockpiled in the area shown on Figure 2 This figure also provides a depiction of the in-place tank layout Following the uncovering of the top of the tanks, the tanks were cleaned and the ansate from the cleaning process were drummed for disposal A copy of the ansate disposal documents, along with a copy of the tank tracking sheets are enclosed in Appendix A On January 8, 1992, each of the tanks were readied for removal Three hundred pounds of dry ice were placed in each tank to purge any volatileiflammable vapors and to render the tank inert The dry ice was allowed to sit within the tanks for a minimum of forty minutes prior to the collection of Oxygen (OZ) and Lower Explosive Limit (LEL) levels It was required that both levels be below 10% prior to the tank removal The first tank removed was the 12,000 gallon diesel storage tank An onsite crane was used to lift -- the tank out of the excavation and place it on an awaiting flat bed truck Prior to the placement on the truck, the tank was visually inspected for any visible signs of leakage None were observed for the diesel tank Once secured on the truck, the tank was transported to the Thorpe facility in Lodi : — to await final disposal The second tank removed was the 12,000 gallon leaded gasoline tank Again this tank was visually inspected with no visible signs of leakage f=inally, the unleaded gasoline storage tank was removed and inspected No visible signs of leakage were observed for this tank While the tanks were being transported, the tank excavation bottom soils and the stockpiled excavation overburden soil piles were sampled The following section provides a discussion of the -- sample collection procedures and methodologies FIGURE 1 1