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/911� <br /> GEOMATRIX <br /> soil samples collected from borings SB-2 and SB-3 (acenaphthene; benzo(a)pyrene; <br /> benzo(b)fluoranthene; benzo(g,h,i)perylene; chrysene; dibenzo(a,h)anthracene; fluorene; <br /> phenanthrene; and pyrene). The soil sample collected from well TW-1 did not contain <br /> detectable concentrations of PAHs (Table 3). <br /> The grab groundwater sample from SB-2 did not contain detectable concentrations of BTEX or <br /> TPPH as gasoline (Table 4). TEPH as diesel was reported in the water sample at 60 <br /> micrograms per liter(µg/1), slightly above the reporting limit of 50 µg/l. Low concentrations of <br /> certain PAHs were detected in the water sample (acenaphthylene; benzo(a)pyrene; <br /> benzo(b)fluoranthene; benzo(g,h,i)perylene; chrysene; dibenzo(a,h)anthracene; fluoranthene; <br /> fluorene; phenanthrene; and 1-methylnaphathene [Table 4]); most of these PAHs were also <br /> detected in the soil samples collected from borings SB-2 and SB-3. <br /> Groundwater samples collected in June and July 1997 from temporary well TW-1 did not <br /> contain detectable concentrations of BTEX, TEPH as gasoline, TEPH as diesel, or PAHs <br /> (Table 4). <br /> 5.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Data collected by Geomatrix and others indicate that the Hanson Property subsurface has not <br /> been impacted by the former pipeline operations. Our experience with sites where soil has been <br /> affected by residual petroleum associated with the former pipeline shows that, without <br /> exception, such soil contains elevated concentrations of TEPH (along with obvious soil <br /> discoloration), little or no BTEX, and low concentrations of various PAHs. BTEX and TEPH <br /> were not detected in soil samples collected by Geomatrix at the site, and organic material <br /> quantified as TOG or TRPH in soil samples from previous investigations appears to be <br /> primarily non-petroleum in nature. <br /> Low concentrations of PAHs were detected in two of the three soil samples. PAHs are <br /> petroleum hydrocarbon constituents,but also occur naturally in soil or from non-petroleum <br /> combustion sources. Although the PAHs detected in soil samples are not associated with <br /> 1:\WPD0CS\4097\ADDL1NVB.DOC 8 <br />