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Mr. Theodore I. Wittmayer, Attorney at Law September 2 , 1992 <br /> Stone Brothers and Associates age 2 <br /> compounds. The borings installed under this program were situated in two areas of the site, as <br /> follows: <br /> Area 1) Borings B-7 and B-8, east of the former underground gasoline storage tank. <br /> Area 2) Borings B-9 and B-10 in the vicinity of Fuel Island No. 2 which was previously <br /> located in what is now the parking lot west of the main Auto Service (Center <br /> building. <br /> Please refer to the attached copy of the site map entitled Figure 2 from the EAI report for the <br /> locations of the site features discussed in this letter. <br /> Issues relating to each of these areas are addressed below: <br /> Area 1 Issues <br /> Area 1 is adjacent to the location of two former underground gasoline storage tanks whic were <br /> removed in 1986. Previous investigation phases have collected and analyzed a number of soil <br /> samples from six borings in the vicinity of the former tank location. The previous investi 3,,ations <br /> of the tank area are documented in a 1988 report by A. D. Selditch and Associates, Inc. and in <br /> a 1991 report by EAI. Analyses of these soil samples indicated the presence of hydrocarbons <br /> in two borings (B-3 and B-4) which encountered a concrete slab beneath the former tanks and <br /> in one boring (B-6) located east of the former tank location. Boring B-6 contained elevated <br /> petroleum compound concentrations in samples to a depth of 50 feet below grade, the total depth <br /> of the boring. <br /> Based on the results of these previous investigations, WESTON advised Stone Broth rs that <br /> additional investigation in the tank vicinity should be conducted to establish the lateral and <br /> vertical extent of hydrocarbon presence and advised that the concrete slab beneath the tank site <br /> should be removed (letter to Mr. Wittmayer dated November 22, 1991). <br /> Although it does not appear that EAI planned specifically to fully define the hydrocarbon extent <br /> in this area during the most recent work (they installed only two borings near the tank), the <br /> lateral extent is now reasonably well established by a combination of data from past work phases <br /> and the new B-7 boring. The analyses of soil samples from B-7 and B-8 show no significant <br /> hydrocarbon presence, thus establishing a "clean" boundary on the east side of the tank site <br /> between borings B-6 and B-7. This boundary may be interpreted to extend to the south end of <br /> the tank site, pass between the two sets of borings (those south of the tank and those over the <br /> tank slab) and then continue north along the west side of the former tank site between the tank <br /> site and boring B-5. The only side of the former tank site which has not been characterized by <br /> RMS\KTfMYR=.WP <br />