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Zc'( <br /> onceptual Madel <br /> Fae2lity No 6100 <br /> PetroIcuin h October 3, zoo2 <br /> hydrocarbons <br /> dispensers, product appear to hake been <br /> during UST and Piping, and the fo released to <br /> hydrocarbons Product the <br /> re truer UST complex Based the sub <br /> beneath <br /> southeastern were found II7 the placement activities n the anal the Product <br /> and southweste vicinity of the highest co analytical data collected <br /> Product nz walls <br /> dispensers ncentiat�ons of <br /> hydrocarbon <br /> ng were between <br /> of the UST pit These, and in sam petroleum <br /> aibon Prima data ples collected from <br /> at de mass i5 between I0 ' sattrce of the suggest that the the <br /> depths ranging from and 45 feet b release dispenthe bu sers and <br /> 45 to &0 feet b bgs with localized It appears that <br /> Characterization <br /> bgs �'dequate chat call z d high concentrations sok of the <br /> Char of the lateral migrationn has been achieved on entered <br /> plete to the southeast off-site (do site <br /> soil samples collected fro rhe highest concentrOw f of <br /> and I25 m off-site bonn Petroleum hydrocarbons <br /> feet bgs A g$�32/MC�r_ Petroleum hydrocarbons remains <br /> detected in boring inaJ°nty of the I were arbons detected in <br /> dm$/k g 13-32/A4W-I Petroleum hydrae Present between a <br /> Sand g�) and benzene (22 3 High concentrations o fbans TPG, BTEX caproximately 105 <br /> 2 Oust below the sand�s'it conact, ed at 111 TPHG (4,400 mpounds) were <br /> groundwater feet bgs in bonn m1lhgrains per kilo <br /> Further along this contact )a likely reflects g 8-32/MW- gram <br /> to the southeast I , as evidenced b the migration o f h I, at the base of <br /> borings VW-18 throe h ' ow concentrations i y the presence of free Ydrocarbon-irn <br /> I These bonn s g VW-2Q su n samples collected product in Pacted <br /> g were ggest Continued s from 55 well MW-I <br /> Product observed in not advanced dee southeastward mi to 65 feet <br /> well Mw- p enough to evaluate Migration n downbgs in <br /> Very low the lateral e tent of in) in Sand <br /> concentrations (at or pact/free <br /> compounds were detected in Just above laboratory <br /> B-32/1gW-1 some soil samples reportin <br /> Given the very low <br /> tr g limits) of TPf1G <br /> unit, and the proble ansrnissIvities re Collected below I25 and BTEX <br /> low concentrations ms with the dnllin Ported fox soil Samples feet b <br /> are due to g equipment dura Ples fr bgs in boring <br /> concentrations in native soil surrConditions ng well installation am the <br /> at the time , it a Tower silty <br /> ounding the boring of drilling, and do PPears likely these <br /> Soil samples collected not represent <br /> Compounds Prior to Au actual <br /> Of the soil sain gust 2000 were not <br /> was detected in a soil sam Ie les sa anal analyzed for 11�ITB <br /> samples collected P Collected wed' the maxima E or other fuel c <br /> Of from soil bonn s beneath the m MTBE concentration �5 2 Ygenate <br /> ox the dispensers, reSpectivel g 13-36 or B-3 7 Product dispensers in mg/kg) <br /> YgenateS Like Y, did not contain , advanced approxi January 2002 <br /> collected from wise, MTBE or fuel ox detectable co mately 10 feet e Soil <br /> m borings B-34 Ygenates were ncentrations of MTB ast and west <br /> appears to be minimal , B-35, or B_38 not detected in an E or other fuel <br /> The MTBE detected b' restricted to ne Based on these Y Of the soil Samples <br /> beneath the dis ar surface soils in the i observations, MTB <br /> Much Smaller subs Pensers during immediate vicim E impact to soil <br /> activities int urface <br /> fuel release t January 2002 ty of the dis <br /> he early 1990's ban v'as documented likely resulted from epara dispensers <br /> M during the sa a separate, <br /> nipling and assessment <br /> P"P-Arco for t1Rs16 t 001RePOMt 61 Qp SCM doe <br /> page 9 <br /> 1 <br /> Stratus <br />