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Tank ID# Size {Gal ) Contents #39-2441-01 2,000 Unleaded Gasoline #39-2441-02 10,000 Diesel #39-2441-03 1.0,000 Diesel The tanks were used for fuel service for the trucking company In 1985, after the purchase of the facwtzes from Yandell, DPC decommissioned the USTs The USTs were emptied at that time On January 16, 1990, the Jim Thorpe Oil Company, a Iicensed tank removal company, removed the three tanks from the rear yard of the Tracy Facility of DPC The contractor was assisted by FGL Laboratory personnel in obtaining soil and seepwater samples The UST field consisted of two 10,000 gallon diesel tanks lying along side each other in the large excavation The 2,000 gallon gasoline tank was located in a separate but adjacent excavation located directly to the north The orientation of the USTs is shown on Figure 3 At the time of UST removal, the USTs were noted to be in fair to good condition as recorded on San Joaquin County inspection documentation During the course of the UST removal, hydrocarbon odor was encountered in the south end of the large UST excavation. The contractor partially refilled the tank excavations with soils from the north end of the excavation and ceased all additional remediation. Soils from the south end of the excavation were stock piled on-site and covered with plastic The three USTs were removed from the site and disposed of properly (See Appendix A for UST removal documentation ) At the fame of tank removal six soil samples and one seepwater sample were taken in .apparent accordance to LUFT guidelines Four samples were taken froul the diesel UST excavation and two samples were taken from the gasoline UST excavation at a location at each end of the USTs The soil samples from the excavation of the UST containing gasoline were analyzed for Total Petroleum Hydrocarbons (TPH) as gasoline, Ethyl Dabromide (EDB), organic lead, and Benzene, Toluene, Ethyl Benzene, and Xylene (BTEX) The soil samples from the large excavation were analyzed for TPH as diesel and BTEX The water table at this location facilitated groundwater seepage into the large excavation to a depth of 12 feet The seepwater -nmple was analyzed for TPH as diesel and BTEX It is not known at what depth the soil samples were taken from in either excavation or if the excavation proceeded beyond the point where the sample was taken 2.2 Existing Soil and Water Analytical Results Sampling at the time of UST removal indicated the presence of hydrocarbons in one soil sample and the seepwater as summarized in Table I The analysis of soil sample taken from the south end of the excavation reported concentrations of hydrocarbons of 53,000 mg/kg as diesel as well as BTEX concentrations between 11 2 BRUNSING ASSOCIATES, INC 4V\%N