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9.0 CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the findings of this investigation, the following conclusions and recommendations have <br /> been developed. <br /> The results of this assessment indicate the presence of low levels of diesel fuel TRPHs in shallow, <br /> near surface, (less than five feet bgs) soils at the site. Peak diesel and TRPHs concentrations in <br /> soil were reported at 21 mg/kg and 53 mg/kg, respectively. Impact to soil at the site by these <br /> compounds was identified at three locations. This shallow impact appears to be associated with <br /> historic site use as a temporary semi-truck and trailer parking area. <br /> Diesel fuel impact to groundwater was identified at the locations of three of the four monitoring <br /> wells installed at the site (MW-1, MW-3 and MW4). Peak reported diesel concentrations were <br /> 2.0 mg/L. Due to the lithologic conditions at the site, identified groundwater impact appears to be <br /> from off-site sources. Likely sources include the Grant Line Gas and Food at 2420 Grant Line <br /> Road and the Chevron pipeline along Grant Line Road. Curtiss Pontiac-Cadillac-GMC at 2450 <br /> Toste Road is another possible source. <br /> Based on historic site use, near surface soil impact should be anticipated in some areas during <br /> grading operations. It is SECOR's opinion that existing soil and groundwater conditions at the <br /> site; however, do not pose a significant environmental liability to ARCO should they choose to <br /> purchase the property. <br /> It is recommended that the installed four groundwater monitoring wells be maintained and the <br /> groundwater be sampled for at least two consecutive episodes in order to confirm the findings of <br /> this investigation. It is further recommended that the groundwater elevations be surveyed at the <br /> time of sampling to detect potential variation in the groundwater flow direction. <br /> JN 40W7-088-01 <br /> I hgViu w\97-06j wi\arcot mc.doc <br /> 9-1 <br />