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Mr. Carl Navarra Report of Tank Removal January 16, 1999 Page Two been emptied of product by the leasee except for a heel in the bottom of each tank. These tanks were located in the north east corner of the site. The asphalt covering the tanks was removed and stockpiled. The soil above the tanks was excavated and temporarily stockpiled. Once the tanks had been exposed and the connecting piping removed the tanks were slightly elevated on one end to allow the remaining product to be removed. The product was removed and manifested by a hazardous waste hauler for disposal. The gasoline tanks were triple rinsed and the rinsate manifested. At this time the scum floating on the top of the water which appeared to be biodegraded fuel was also skimmed from the surface of the groundwater and sent with the rinse water for disposal as non RCRA hazardous liquid waste. On the day the tanks were to be removed, the gasoline tanks were inerted with 30 pounds of dry ice per 1000 gallon capacity and the diesel tanks were inerted with 15 pounds of dry ice per 1000 gallon capacity. The lower explosive limit of the vapors within each tank was measured in the presence of the Tracy Rural Fire Department with an O2/Lower Explosive Limit Meter. The lower explosive limit and oxygen readings are as follows: Oxygen Lower Explosive Limit �. Tank #39-1392-01 5.1% 1% Tank #39-1392-02 .2% 6% Tank#39-1392-03 2.3% 5% Tank#39-1392-04 1.5% 0% The tanks were physically removed from the excavation using a 30 ton mobile crane and loaded on trucks for shipment to the tank disposal contractor. The tanks were manifested, numbered and shipped off site. All the tanks were intact with no visible signs of leakage. Each of the tanks had passed leak detection tests while previously in service. Since the tanks were situated below the water table, samples were taken as directed by the San Joaquin County inspector, at the interface between the soil and the water. Chain of Custody was prepared and the samples were taken to Chromalab a State licensed laboratory. Samples were taken by an independent sampling firm as required by San Joaquin County policy. The laboratory analysis were performed as required by San Joaquin County. The soil and water samples were also taken using the excavator bucket. Analysis for all samples included total petroleum hydrocarbon as gasoline and diesel, benzene, toluene, ethyl benzene and total xylenes, total lead and EPA 8260 which is the analysis for fuel oxygenates. On December 21, 1998 the pipeline trench between the pump island and the tanks and the area beneath the pump islands which had been over excavated due to the obvious leakage w 4 Q h 2 -- —