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i <br /> 25' 6' ; ethylbenzene, toluene, & TPH as gasoline were below <br /> detection limits. The sample at 31' measured . 008 mg/kg of <br /> benzene, 020 mg/kg of ethylbenzene, and 048 mg/kg of xylene; <br /> toluene & TPHG were below detection limits. Soil samples at 36' <br /> & 40 ' 6" were below detection limits for all tested substances. A <br /> comparison between soil boring B--5 & Location "A" is given below <br /> BENZENE E.BENZENE TOLUENE XYLENE TPHG <br /> B-5 25' . 068 . 011 _037 ND ND <br /> B-5 30' ND ND ND ND ND <br /> LOC A 25' 6" . 008 ND ND ND ND <br /> LOC A 31 ' .008 .020 ND _048 ND <br /> LOC A 36' ND ND ND ND ND <br /> LOC A 40 ' 6" ND ND ND ND ND <br /> Using the LUFT manual Environmental Fate Worksheets, {table 2-4 , } <br /> for location "A" , benzene is the only substance which exceeds the <br /> allowable limits for leaving in place_ As shown above, the <br /> amount of benzene remaining after 3 1/2 years has decreased by <br /> over 80%. Although minor amounts of ethybenzene & xylene were <br /> detected in samples from location "A" , they are far below the <br /> allowable limits for leaving in place. The samples at 36' and <br /> 40' 6" were below detection limits for BETX & TPH-G. Refer to <br /> EXHIBIT E for copies of those worksheets. <br /> LOCATION "B" - This soil boring was placed close to the edge of <br /> the former excavation which had contained the UST, refer to PLATE <br /> B for details. A sidewall sample, #SW-2W, was taken at 13' from <br /> the side of that excavation, & revealed significant levels of <br /> toluene, ethylbenzene, xylene, and TPH as gasoline; refer to <br /> TABLE TI for details. Laboratory results of the soil samples <br /> taken in auger hole location "B" are summarized on TABLE VIII <br /> Copies of the laboratory reports are included as EXHIBIT D _ W <br /> PLATES E & F show the relationship of auger hole "B" and the <br /> samples taken from the excavation As can be seen from an <br /> examination of those two plates, the levels of ethylbenzene, <br /> toluene, xylene, & TPH as gasoline have decreased dramatically <br /> between the two sampling dates. Benzene was not detected in the <br /> sox] collected from the side of the excavation, but was measured <br /> in the cores taken from location "B" . This is not totally <br /> unexpected, since the excavation remained open for several hours <br /> prior to taking the soil sample, and benzene is the most volatile <br /> of the components measured. <br /> Utilizing the LUFT manual Environmental Fate Worksheets, only <br /> 5 <br />