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same <br /> area as the TCE plume. South of AP 62 Lot 241, the PCE plume appears to become <br /> but the exact width cannot be determined due t an insufficient number of <br /> wid b } <br /> measurements in this area. (AE1 I996a, ASI 1996b, AEI 1996c, ASI 19964,ASI I9 6e, <br /> A.uat 1996) <br /> x <br /> The estimated shapesf the plumes shown in Figures I �2 are consistent with the <br /> determination by Award Environmental Inc. (AEI)that the groundwater in the area flows <br /> from the industrial area toward the south-southeast (AE1 1996a,ASI 1996b). Al.though <br /> the boundaries,es o the lumes shown on `figures 1 and 2 are estimates, it is until ely that <br /> theselumen are substantially voider north of AP 62 Lot 241 because TCE and PCE have <br /> not been detected in samples from multiple wells on either side of the estimated <br /> _ <br /> boundaries of the plume. <br /> In addition to the observed areal variation in the concentrations, the WE and PCE <br /> concentrations in the lues will vary with rnth depth below the surface. Both CE andPCE <br /> are denser than water ATSDR 1995a, 1995b). Consequently, if there are no barriers to <br /> V <br /> groundwater flow t depth,these plumes will tend to become deeper the further they are <br /> source, However,ver the de the o mese two plumes cannot be determined with <br /> from p <br /> cert of the water samples have been collected from wells which <br /> aim because the majofi� <br /> collect groundwater from a thick (15 feet) stratum of the soil. <br /> 5 <br />