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. " <br /> i , <br /> ! <br /> 14.September 1998 <br /> AGE-NC Project No:98-0440 1 r' <br /> _Page 7 of 9 <br /> t t <br /> boring's-B'hthrough_B4B6,.and MW"I'through MW 3_between l O�arid 17 feet bsg, Furthermore, ; <br /> organic.yap or was a#ected (using..a.RID)in=soil_sample duplicates at concentrations as high as;493' <br /> :.parts per-million (pprn)-�. -- .. „ <br /> Slight petroleum hydrocarbon odor was noted in sample duplicates collected'from soil borings B2, <br /> B3,MW-2'and MW-3 between 10 and-15 feet bsg: Additionally; organic vapor was detected in these'.- <br />' samples,at concentrations up to 54 ppm. Faint organic vapor was-detected from MW­I.at 20 feet bsg,,. <br /> at 2 ppm. <br />' x ,Neither petroleum hydrocarbon odor, organic vapor nor discolora#ion were observed'in.soil sample . <br /> duplicates'collected from 135'and MW=4. <br />' Faint petroleum hydrocarbon odor.was detected in quarterly,ground water samples collected from' <br /> wells MW-Ian d MW-2. r <br /> 4.3.. QUARTERLY GROUNDVATER ELEVATION AND GRADIENT, <br /> 1 On I5 July 1998, the depths_to-ground water in-wells MW-1 through MW-4 ranged between 8.54' <br /> and 9.36 feet below the tops of well'casings. Ground water elevations,as measured on 15 July 1997, <br />' r are depicted'in Fit�r�-Qt In'July'1998, the gene ` titer gradient at the site was calculated <br /> to be approximately 0.013.ft/ft r'approximatel 69 feet per mil�didirected towards the north. Due <br /> to the'low:gradien lte, slight variations rn groun ••water measurements 'or changes`.of, _ <br /> .`recharge/discharge of the local'ground water couid;greatly modify ground water direction. , <br /> 4 4 ANA,LYTICAL•RESULTS OF SOIL'SA.MPLES <br /> . } .' <br /> A�total of twenty-three-soil samples were;'subiniited to a state certified•laboratoryfor analysis of _ <br />,. .. <br /> TPH-g; TPH-d,BTE&X,and fuel oxygenates:'Utilizing EPA. Method 8015M, TPH=g was detected <br /> in soil'sari pies collected from soil borings:BI .through B6 and'MW-2r at concentrations ranging <br /> between'1'ppm'(iriilligr*s pe.r�kilogram ppm),and 580 parts per million(B4 at 10 feet bsg). TPH-d !' <br /> was detected in soil samples,collected from soil'borings B 1, B2', B4,B5,•B6, <br /> MW-2 and MW-3 at <br /> g .. <br /> concentrations ranging between 1.2.ppm•(MW-2•at 10-feet bsg);and- 420'ppm (B4 at 10-feet bsg). <br /> 1 <br /> Utilizing EPA Method 8020, BTEX constituents,were detected in soil samples�coliected from-soil <br /> borings-.13 1 through B4;B6; MW-1' and MW-2 at concentrations ranging between,0:005'ppm and <br />' '32 pprri. The highest concentration of benzene was reported in the 15-foot sample.from MW-2'at 3.9 <br /> ppm. MTBE was not detected above`�laboratory reporting limits for any of the analyzed.samples. <br /> r Advanced deoEnvi�onmegtal,Inc. . <br />