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27 March 2000 <br /> AGTF-NC Project No. 98-0450 <br /> Page 4of' 19 <br /> Soil samples were collected from each boring at five-foot intervals, heginning at various depths. At <br /> the request of the PIIS-I-=HD. a grab ground water sample was collected from boring S132 to <br /> determine if hydrocarbon contamination was present. After drilling, ground water was allowed to <br /> enter the auger at a depth ol'approximately 45 feet bsg. <br /> 2.6.1. Sod] And Water Sample :Analysis <br /> Selected soil samples and the grab ground water sample were analyzed for total petrolcr1111 <br /> hydrocarbon~ quantified as gasoline and as diesel (TPM-g and TPId-d) in accordance yvith EPA <br /> Method 8015 Modified; volatile aromatic compounds (benzene, toluene, ethylbenzene and total <br /> xylenes; BT X) in accordance with EPA Method 8020. fuel oxygenates including methyl tertiary <br /> butyl ether(MTBE).tertiary butyl alcohol (TBA). di-isopropyl ether(DIP E),ethyl tertiary butyl ether <br /> (ETBE). tertiary amyl methyl ether ('FAME) and ethanol in accordance with EPA Method 8260 <br /> Modified. <br /> `I,lnree soil samples were transported to an independent microbiologist, Mr. A. Kcith Kaufmann of' <br /> Culver ON. California, and were analyzed for physicochemical properties and microbiological <br /> enumeration. Data obtained from the microbiological and physicochemical analysis was used to <br /> evaluate potential effectiveness of bio-rennediation 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 (C'11) of Mountain View, California and was analyzed fur specific <br /> oravity, porosityipermeability and organic content_in accordance with ASTM Methods 17854. D5084 <br /> and D2974. respectively. <br /> 2.6.2. Hydrocarbon Impacted Soil <br /> Laboratory results of the soil samples analyzed are summarized in Tables I and 2. <br /> • 'HE'H-g and BTEX were detected at high concentrations below the former USI-s. and <br /> 13'1'1:X compounds in soil are delineated toward the southwest and south by analytical data <br /> from soil samples collected from soil borings BMW-5 and 5137. <br /> • -1-he vertical extent of the soil impacted by petrolcunn-hydrocarbons vas delineated to depths <br /> above 60 feet in the former US"C 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 analvsis from the western end of the former northern dispenser island (SB5). <br /> • Ben/enc was detected at its greatest concentrations in soil in the former UST area. <br /> Idrunced Geof:m ironmental.Inc. <br />