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gasoline, while Samples 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 /> remaining chromatograms where volatiles were detected show small <br /> scattered Beaks, typical in magnitude to "background" levels at <br /> service siations. <br /> The xylene=. are less volatile and less soluble than the other <br /> analytes and adsorb more readily to soil particles. As a result, <br /> the xylenes are usually good indicators of source locations. The <br /> xylene patterns suggest that gasoline 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 <br /> relatively recent and appears to extend to the site boundary, . <br /> further investigation of the site may be warranted. <br /> s - <br /> 1X,,_ <br /> 8 <br /> �c <br />