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gasoline, while Sanples 6 and 7 (in the landscape bed and entrance <br /> driveway, respectively) have chromatogram signatures characteristic <br /> of slightly weathered gasoline. More extensive weathering is often <br /> observed in areas of lower total hydrocarbon concentration. The <br /> remaiiiing chromatograms where volatiles were detected show small " <br /> scattered peaks, typical in magnitude to '!background's levels at <br /> service atations. <br /> The xylenes are less volatile and less soluble than the other <br /> f analytes and adsorb more readily to soil. particles. As a result, <br /> V ' <br /> - _ _ the xylenes are usually good indicators of source locations. The <br /> xylene patterns suggest that gasolina entered the subsurface south- <br /> east of the pump island and subsequently migrated in a northeast- <br /> ' erly direction toward Pershing Avenue. <br /> Because the gasoline contamination near the pump islands is c <br /> relatively recent and appears to extend to the site boundary, <br /> further investigation of the site may be warranted. <br /> F Lj <br /> r, <br /> g <br /> i <br /> : <br />