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- SPU VF9 <br /> C a <br /> � D <br /> 0 N <br /> lgpe <br /> I • <br /> of the areas exhibited soil impact below approximately 15 feet. The cause of this attenuation is <br /> not clear,but is likely related to soil properties. <br /> Areas 1 tbrough12 have been delineated in soil and groundwater to low to non-detectable <br /> concentrations of hydrocarbons, and further have been defined as contained to within 25 feet of <br /> the pipeline. Thus,the lateral extent of impact from the areas is relatively small. <br /> Hydrocarbon impact exhibited some differences in Neighborhood B relative to Neighborhoods <br /> C,D, and E(the locations.of these Neighborhoods is shown in Figure 2). In eight of the thirteen <br /> I areas identified in Neighborhood B, neither hydrocarbon staining nor hydrocarbon odor was <br /> lnoted in the soil cores, yet significant concentrations of petroleum hydrocarbons were detected <br /> 1 , <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> 9 <br /> I4'%HMPROJECTSUN3037"Shell Mountain HouscWcighb,c,Mcighb8\14eigh B Rcyon\Bsuuu=rympon.doc <br />