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1 <br /> gasoline, while Sa:,p1Ps 6 and 7 (in the landscape bed and entrance <br /> driveway, respectively) have chromatograrisignatures characteristic <br /> Of slightly weathered gasoline. More extensive weathering is often, <br /> observed in areas <br /> Of lower total hydrocarbon concentration,, The - J <br /> remaining chromatograms where volatiles were detected show snail <br /> M1J scattered peaks, typical in magnitude to ."hackground'l levels .'at <br /> service stations. i <br /> The xylenes are less volatile and less soluble than the other <br /> analytes and adsorb more 1 readily soto il.t� <br /> particles. As a .result, <br /> the xylenes are usually good indicators of source Jocatians. The <br /> xylene patterns suggest that <br /> gasoline entered the subsurface south- ! <br /> east of the pump island ana subsequently migrated in a northeast- <br /> r ;. <br /> erly: direction toward Pershing Avenue. <br /> Because the gasoline contamination near the pump islands is <br /> relatively recent; and appears .to extend to the site boundary, <br /> r. <br /> further inv��stiaatian of the site may be warranted. <br /> F.e s. <br /> 1 <br /> i i — <br />