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' 15 June 1999 <br /> AGE-NC Project No 98-0450 <br /> ' Page 3 of 27 <br /> Soil samples were collected from each boring at five-foot intervals,beginning at various depths bsg <br /> ' At the request of the PHS-EHD, a grab ground water sample was collected from boring SB2 to <br /> determine if hydrocarbon contamination was present After drilling, ground water was allowed to <br /> ' enter the auger at a depth of approximately 45 feet bsg <br /> ' 2 4 1 Soil And Water Sample Analysis <br /> Selected soil samples and the grab ground water sample were analyzed for total petroleum <br /> ' hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) in accordance with EPA <br /> Method 8015 Modified, volatile aromatic compounds (benzene, toluene, ethyl-benzene and total <br /> xylenes, BTEX) in accordance with EPA Method 8020 , Fuel oxygenates including methyl tertiary <br /> ' butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPS), ethyl tertiary butyl <br /> ether (ETBE), tertiary amyl methyl ether (TAME) including ethanol in accordance with EPA <br /> ' Method 8260 Modified <br /> Three soil samples were transported to an independent microbiologist, Mr A Keith Kaufmann of <br /> Culver City, California, and were analyzed for physicochemical properties and microbiological <br /> enumeration Data obtained from the microbiological and physicochemical analysis will be used to <br /> determine possible effectiveness of bio-remediation as a remediation alternative <br /> One soil sample from the site was submitted for geotechnical analysis The sample was transported <br /> to Copper Testing Laboratory (CTL) of Mountain View, California and was analyzed for specific <br />' gravity, porosity/permeability and organic content, in accordance with ASTM Methods D854, <br /> D5084 and D2974, respectively <br /> 2 4 2 Hydrocaibon Impacted Soil <br />' Laboratory results of soil samples analyzed are summarized in Tables 1 and 2 <br />' • TPH-g and BTEX were detected at high concentrations below the former USTs TPH-g and <br /> BTEX compounds in soil are delineated toward the southwest and south by analytical data <br /> from soil samples collected from soil borings BMW-5 and SB7 <br /> • The vertical extent of the soil Impacted by petroleum-hydrocarbons was delineated to depths - <br /> above 60 feet in the former UST area and above 40 feet bsg in the former dispenser island <br />' area However, fuel additives were not limited to depths of less than 40 feet bsg, based on <br /> soil analysis from the western end of the former northern dispenser island (SB5) <br /> '• • Benzene was detected in the greatest concentrations below in soil the former UST area <br /> 1 <br /> Adinnced CeoEmiron mental,Inc <br /> u <br />