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J, H. KLEINFELDER &ASSOCIATES <br /> File: W-2006-1 <br /> March 18, 1986 <br /> Page S <br /> reading of 21 ppmv _ -vncentratIons of gasoline related <br /> constituents and total hydrocarbons were below detectable limits. <br /> Soil samples with PID readings of 190 ppmv, 180 ppmv, and 120 <br /> ppmv were collected from Boring B-8 at depth of twenty one, twenty <br /> six, and thirty one feet, respectively. The soil sample collected <br /> from a depth of twenty Pix feet in Boring B-7 had a PID reading of <br /> 50 ppmv. Although these four samples were not chemically <br /> analyzed, it is expected that gasoline related constituents and <br /> total hydrocarbons would have been detected. The PID data and <br /> sandy soil suggest that the lower PID readings are related to the <br /> volatile fractions of the gasoline migrating through the <br /> Interstices of the soil. The direct source of the vapors are not <br /> known but speculation is that it is from gasoline present in the <br /> surrounding soils or trapped in the capillary fringe. <br /> Yb <br /> Based on the analytical results and PID readings of the soil <br /> samples collected during this and previous sails investigations, <br /> the extent of hydrocarbon migration in the soil has been <br /> -- reasonably ascertained. Soil borings were placed along five <br /> radial lines from the tank excavation area. The first borings <br /> along each radial line were placed approximately ter feet away <br /> from the tank excavation area. Along the radial lines to the <br /> northwest (8-11 and B-12) , northeast (B-13 and B-14) , and east <br /> (B--15 and B-16) of the tank excavation area, analytical results <br /> and PTD readings indicate that hydrocarbons are below detectable <br />