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900003OAll CON-14 being excavated in the vicinity of the tank farm. All underground piping within the tank farm was removed and replaced with piping at or near the surface about 4 years ago. Oil is usually obtained from smaller containers (1 and 5 gallon) stored within the equipment maintenance and repair shop. Oil and hydraulic fluids are also obtained from three 55-gallon drums located just outside the shop. The drums sit on concrete and a small trough was constructed beneath them to contain spillage. Waste oils are stored in 55-gallon drums. On the day of the site inspection, 7 waste oil drums were stored on pallets sitting on gravel along the western boundary of the property. The drums are periodically picked up for recycle by a commercial contractor. An additional 9 55- gallon drums were stored in the northwestern corner of the site. These drums contain gasoline and diesel removed from the underground storage tanks during tank closure. The drums are awaiting offsite disposal . A commercial solvent storage and washing tank is located inside the equipment maintenance and repair shop. The solvent is contained within a "closed" system and is periodically picked up for recycle by a commercial contractor. No underground storage tanks are known to exist at the site at this time. Three underground storage tanks, including a 5000-gallon and a 10,000-gallon gasoline tank, and a 10,000-gallon diesel tank, were removed in 1987-1988. Leakage of hydrocarbons was observed at the time of the tank removal . Affected soils were excavated to a depth of approximately 24 feet. Five soil samples were collected for analysis by Twining Labora- tories under the supervision of the San Joaquin Local Health District. The excavation was backfilled with imported fill material and compacted. The excavated soils were allowed to aerate onsite, near the southeastern boundary of the site. The aerated soils were disposed of in 1989. 2-8