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Clayton <br /> FWRO.ME%TdE <br /> (O�SI(TANIS <br /> Clayton discussed these soil samples with Ms. Hinson on the telephone on March 28, 1991. <br /> " The conversation was confirmed in a letter to 4SH from the SJC/EhD At Ms Hiiison's <br /> 'z <br /> ential of the <br /> request, we reanalyzed the sample from 4 feet bgs to determine the leaching pot <br /> zy a° constituents. The sample was reanalyzed by the following methods• <br /> • Envirosimental Protection Agency (EPA) Method 801513550, for diesel fuel a <br /> • Standard Method 5520F, for hydrocarbons <br /> r .� • Standard Method 5520E, for total oil and grease1 <br /> pp <br /> f These analyses revealed the following fractions of hydrocarbons m the soil: 3 m these! fuel, <br /> W� ��' 280 ppm of hydrocarbons, and 660 ppm of oil and grease. <br /> Clayton recommended, and the SJC/EHD concurred, that five boreholes be installed around <br /> MW-3B'to determine the extent of hydrocarbons in the surrounding soils. Sod samples were t <br /> � T collei7ed:from 4`feet and 9 feet below grade and analyzed,for hydrocarbons by EPA Method i <br /> , 55200: 'Hydrocarbons were not detected in any of the samples. <br /> Althdfigb�rearialysis of,the-MW-3B sail sample revealed oil and grease, diesel, and <br /> `h ilrocaiboits at 4l ecbel6 gr'ouna surface, analysis of the-sod'sample,collected from 9 feet <br /> NA <br /> 'bgt'resrealcd-ss` f 6nLlydlower��acentrauons o€petroldum constituents. Also,we did not <br /> � <br /> detect,these,cdnstituents B in,thb sail samples takers,iron any of the five surrounding <br /> Ffly, y^air? e+i '� Y f z <br /> �4 ioretibles.,'T�ie constitiierits &not leach easilyArom softs, and'analysis of g roundwater <br /> ' m les fr" i1MW.2- 'if ii&,i`eveal detectable,doncentrations Because the analysis of soil <br /> r <br /> a� sam leanfrom they adjacent,boreholes demonstrated`.the=iuiuted extent of the petroleum <br /> i ;coiistituehts>iri thersurrnuridiiig soils, Clayton recommended no further soil remediation at the <br /> `y �ub}ect site. <br /> �z <br /> ` k y <br /> Arg• i <br /> �'TraF'�r�'9 fvd <br /> ,r <br /> F fF <br /> F� s <br /> � t <br /> S' t - _ ,<. •-._„,,, ••,• •a'o+au+tss+n.a..3+,,..r..•.wcc.v r .r..,.., <br />