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yImr WOI <br /> _ J. H. K.LEINFELDER&ASSOCIATES <br /> File: W-2006-1 <br /> March 18, 1986 <br /> Page 9 <br /> r limits in the soil. Hydrocarbons are present in the soil borings <br /> f ten feet to the west (B-?) and southwest (5-8) of the excavation <br /> area, but not in the sail samples from the borings twenty feet to <br /> B-9 <br /> - west of the excavation area. In the <br /> the west (B• 5) and south ( ) <br /> € previous investigation hydrocarbons were detected in the soil <br /> samples collected at sixteen and twenty six feet in Boring B-1 <br /> 1 <br /> (2,300 ppm and 3,300 ppm) and the soil sample collected from <br /> twenty one feet from Boring B-3 (35 ppm). High PID readings <br /> .r (calibrated to 50 ppm pentane) were recorded from the soil saLples <br /> F <br /> %;ollected from Borings B-1, B-3, and B-4. <br /> I <br /> In the soil borings drilled during this and previous <br /> investigations, hydrocarbons have not been encountered until <br /> F ; approxim _ely sixteen feet below the ground surface. The <br /> hydrocarbons are present in the soil from sixteen feet down to the <br /> water table; but are limited to a lateral distance of <br /> approximately ten feet from the tank excavation area. Although <br /> hydrocarbons are likely to be present in the soil to the south and <br /> southwest of the tank excavation, the extent of hydrocarbon <br /> migration has not been addressed in this or previous <br /> _ investigations. The extent of known lateral hydrocarbon migration <br /> in the unsaturated zone is shown on Plate No. 2-1. Two cross-- <br /> sections (A-A', B-B') of the tank excavation area are shown on <br /> _. Plate Nos. 2-2 and 2-3. <br /> • �% The analytical results and PID readings of the soil samples <br /> r T. collected from Borings B-5 and B-6 suggest hydrocarbonf from the <br /> E <br /> f <br />