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lFeriffianc <br /> 2.0 SITE BACKGROUND <br /> The area surrounding the site has been a mix of airport and agricultural usage for over <br /> 40 years The site has been in existence since the early 1950's as an airplane fueling station <br /> and was expanded to its present size of approximately 25 acres in 1974 The fuel storage for <br /> the site was originally located in three 5,000-gallon steel USTs which were installed in the <br /> early 1950s These USTs were removed in 1990 These three USTs are shown as dashed <br /> outlines in Figure 2 The USTs were oriented east-west and rested on a six-inch thick <br /> concrete slab The slab still remains m-place.at a depth estimated to be 11 feet bgs The fuel <br /> idispensers were originally located on the north side of the USTs During the 1974 <br /> expansion/modernization, the dispensers were relocated 30 feet to the east Aviation gasoline <br /> was reportedly stored in the former USTs until the early 1960s when turbine powered aircraft <br /> began replacing older piston powered planes From approximately 1962 until 1989, JP-4 was <br /> stored in the former USTs <br /> lieNo fuel loss from the former USTs was identified during inventory monitoring <br /> Inventory monitoring was accomplished by weekly sticking There is no record of any <br /> precision leak test having been performed on any of the three USTs There is no record of <br /> any repairs of the former USTs, however, as described previously, the dispensers were <br /> relocated 30 feet to the east during the 1974 expansion <br /> 2.1 Undeiground Storage Tank Removal <br /> The three 5,000 gallons former USTs were taken out of operation in 1989 and <br /> 1 were <br /> removed in January 1990 The former USTs reportedly appeared intact and not leaking at the <br /> time of removal Five soil samples (1 through 5) were collected from beneath the tanks at <br />' the time of removal by Blaine Tech Services, Inc The sample locations are shown m <br /> Figure 3 Samples 1 through 4 were collected along the edge of the concrete slab and sample <br /> was collected beneath the slab followun conn a hole throu the slab's All samples were <br /> reportedly collected from 2 75 feet below the concrete slab, approximately 13 to 14 feet bgs <br /> Analytical results reported no detectable concentrations of fuel constituents from samples 2, 3, <br /> 4 <br />