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s *, <br /> ;in 6 aid 7 the'la: <br /> gasoline, whi .e Samples dscape bed and.entrance <br /> driveway, respectively) have chromatogram signatures characteristic <br /> ! <br /> 17. <br /> ! of slightly weathered gasoline. Fiore extensive weathering is often <br /> observed Iin areas of lower total hydrocarbon concentration. The <br /> ! remaining chromatograms. where volatiles were detected show small <br /> scattered peaks, typical ih magnitud'a to .",background'.' levels" at <br /> ti service stations. <br /> .h ^� <br /> The xylenes are less volatile and less soluble than the other <br /> rticles. As a result, <br /> analytes and adsorb more readily to soil..pa <br /> ;. the xylenes are usually good indicators of source 1'�cations. The <br /> xylene patterns suggest that gasoline entered the subsurface south- <br /> xylene <br /> east" of the pump ':,land and aubsegtaentl.y migrated in a northeastLj <br /> direction toward Pershing Avenue. <br /> BecLuse the gasoline. contanination. near. the pump islands is <br /> relatively recent and ' appears to extend to the site boundary, <br /> furtheinvestigation of the site may be warranted. <br /> l r <br /> �p <br /> +� 4 ••' ~•t wl <br /> i <br /> rF <br /> x <br /> n; <br />