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��Ll rill N� fuel dispensers were originally located on the north side of the USTs During the 1974 expansion/modernization, the dispensers were relocated 30 feet to the east Aviation gasoline was reportedly stored in the USTs until the early 1960s, when turbine powered aircraft began replacing older piston powered planes From approximately 1962 until 1989, JP-4 was stored in the USTs Fuel loss from the USTs was not identified during inventory monitoring Inventory monitoring was accomplished by weekly sticking There is no record of a precision leak test having been performed on the three USTs There is no record of repairs of the USTs, however, Ias described previously, the dispensers were relocated 30 feet to the east during the 1974 expansion 2.1 Underground Storage Tank Removal The three 5,000-gallon USTs formerly on site as shown in Figure 2 were taken out of roperation in 1989 and removed in January 1990 The former USTs reportedly appeared intact and not leaking at the time of removal Five soil samples (1 through 5) were collected from the soil beneath the tanks at the time of removal by Blame Tech Services, Inc Samples 1 through 4 were collected along the edge of the concrete slab and sample 5 was collected beneath the slab after a hole was cored through the slab Analytical results from sample 1 indicated 1,500 milligrams per kilogram (mg/kg)total petroleum hydrocarbons as diesel (TPH-D) and 1,600 mg/kg TPH as het fuel, sample 4 contained 3,500 mg/kg TPH-D and 5,100 mg/kg TPH as het fuel TPH-D, TPH as het fuel, and BTEX were not reported at or above laboratory detection 1 limits in any of the other samples Records related to the former UST piping were not available, but due to the close proximity of the dispensers to the former USTs, the amount of piping was most likely minimal As soil adjacent to the USTs was impacted with petroleum hydrocarbons, an Unauthorized Release Form (No 90-Ul 1) was completed and submitted to the PHS/EHD on January 31, 1990 Proposition 65 notification (No 90-022) was also submitted at this time Sample locations and analytical results as presented by previous consultants for the soil samples tcollected during the UST removal, and subsequent investigations were detailed in Versar's Site Investigation Workplan, dated August 2, 1995 2.2 Delta Environmental Investigation On October 24, 1990, Delta Environmental collected three soil samples (HB-1, HB-2, and iHB-3) from the UST excavation by advancing a hand auger to a depth of 5 5 feet below the concrete slab along its northern edge Analytical results identified no detectable concentrations of TPH-D, TPH as jet fuel, or BTEX from samples HB-1 and HB-2 Analytical results from sample HB-3 identified 11 mg/kg TPH-D, 14 mg/kg TPH as het fuel and no detectable concentrations of BTEX above laboratory detection limits H1PROJECTSIDSAISTOCKTONI3RDIREPORT FL 3