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1 , <br /> L 1 <br /> 1 , <br /> r 17 December 1999 I <br /> AGE-NC Project No 96-0235 ' <br /> 3 <br /> Page,10 of 11 - <br /> , �x <br />` > '• The low concentrations of organic vapor and hydrocarbons detected in samples collected° <br /> beneath a depth of approximately 55 feet bsg m borings B 10, B 11 and B 15 may be from <br /> cross contamination of the sampler during lowering through impacted ground water in the <br /> r w <br /> drilling augers during sampling <br /> H�I IJ I!� �S Ilk'L ` I + ' + <br />' r i <br /> Approximately 1024 gallons of gasoline and diesel are estimated to remain in soli beneath a <br /> ` pp _ A <br /> !!` the former UST No 3 area <br /> I l +rY <br /> • Fuel oxygenates were not detected in soil samples analyzed from the'former UST No 3 area <br /> • High permeability was measured in the sample collected from a depth of 35 feet in boring <br /> B 11 Low permeability was measured in the other five samples Moderate to high porosity <br /> was measured in all six samples tested <br /> I , <br /> I F 1 <br /> Based on the data collected from the former UST cluster area, AGE finds <br /> r <br />' Sand, underlain by silt was encountered in boring B9 at a depth of 15 feet bsg Clay was <br /> encountered from 20 feet to 65, feet bsg, the total depth explored Sand'and clay were <br /> encountered in borings MW-9 and MW-10 <br /> r , HI concentrations of petroleum hydrocarbons were detected in soil samples collected from <br /> boring B9 Petroleum hydrocarbons and organic vapor were not detected in samples collected. <br /> from boring MW-9 Hydrocarbon odor was noted in the auger returns from boring MW-10,' <br /> however, soil samples were not collected from this boring The northern extent of impacted, <br /> soil appears to be between MW-1 0'and,MW-9 <br /> +' �{ Very high concentrations of petroleum hydrocarbons were detected in the grab water sample <br /> -collected from boring B9 Hydrocarbons were also detected in the water samples collected <br /> from MW-9 and 1 MW-10 <br /> ' Low concentrations of MTBE and TAME were detected,in a,soil sample from boring B9 <br /> MTBE i was detected in water samples� collected: in d' the forme? UST cluster area at <br /> tconcentrations as high as 230 ppb TBA was detected'in the water sample collected from <br /> MW-10 at a concentration of 35'ppb Other oxygenates were not detected in soil or water <br /> samples collected <br /> n r <br /> 11 4 <br /> t it <br /> 5.0. RECOMMENDATIONS r ' <br /> , I ! <br /> Based on the findings of the environmental'activities recounted in this report, AGE recommends <br /> • Installation of additional ground water'monitonng wells at the former UST cluster location <br /> ' " I <br /> I Advanced CcoEnvironmental,Inc ' <br /> I <br /> !I 41 f L <br /> 1 <br />