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ARCADIS GERAGHTY&MILLER <br /> of 20, 30, 40, 50, 60, 70, and 80 feet bgs Soil samples taken at four deeper intervals (at <br /> depths of 100, 110, and 119 ft bgs)were nondetect for TPHg BTEX was detected in the same <br /> depth intervals in which TPHg was detected In addition, low levels of BTEX were detected at <br />' the 110 ft depth interval The sample taken in the 119 ft bgs interval was nondetect for TPHg <br /> and BTEX <br /> The NP-1 boring data indicate that the vertical extent of soul impacts has been <br />' delineated and that the impacts are comprised of an approximate 90 foot thickness between <br /> 20ft and 119 ft bgs <br /> Low levels of TPHg and BTEX were detected m the soil samples taken from the 60 <br />' and 70 foot bgs intervals in the NP-2 boring The NP-2 boring data indicate that the vertical <br /> extent of soul impacts have been delineated, are minimal, and confined to a thickness between <br /> the 60 and 70 foot bgs depth intervals <br />' 6.4.2 Groundwater Impacts <br /> Tables 5-1 and 5-3 summarize the vertical extent of impacts of TPHg and benzene as <br /> indicated by the samples collected with the SimulprobeTm in borings NP-1 and NP-2, <br /> respectively Table 1 of Appendix D summarize the findings of the groundwater monitoring <br />' results conducted in the well nests NP-1 and NP-2 on February 5, 1999 Figure 6-3 illustrates, <br /> and provides a cross-sectional interpretation of, the summarized data of the quarterly <br />' monitoring results and the Simulprob6m groundwater results for benzene at depths were no <br /> wells are screened <br /> 1 <br /> The TPHg and benzene groundwater analytic data collected from NP-1 using the <br />' Sunulprobe technique, near to the source area, indicate that the depth of maximum impact is in <br /> the 60 to 70 foot bgs depth interval Concentrations of benzene significantly attenuate with <br />' 38 <br />