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highest amounts of contaminants were encountered on the <br /> south side of the excavation, which is where the UST and <br /> abandoned cesspool were located There is an area of minor <br /> contamination on the north wall at 13 ' , but the sample below <br /> it at 18 ' was clean Xylene was noted in two samples from <br /> the excavation, and one from the spoil. pile, Benzene, <br /> Toluene, & Ethylbenzene were below detection limits in all <br /> samples <br /> TPH-G was noted in two samples from the excavation, but was <br /> not detected in the spoil pile TPH-D, however, was found <br /> in all spoil pile samples, and eight of the samples from the <br /> pit Of those eight samples, three exceeded the limit of <br /> 100 mg/kg, and two from the south wall were ite high <br /> Oil & Grease was detected in seven samples , indicating that <br /> the former cesspool most likely contributed to the high <br /> levels encountered <br /> Ethylene Dibromide, a constituent of chemicals used for soil <br /> sterilization, and sometimes used as an additive in <br /> gasoline, was detected in three samples from the hole, and <br /> two from the spoil piles The amounts measured ranged from <br /> a low of 1 7 ug/kg to a high of 3100 ug/kg, with a detection <br /> • limit of 0 50 ug/kg Neither the LUFT Manual nor the <br /> Tri-Regional Recommendations give suggested minimum <br /> detection limits for this constituent <br /> The laboratory analysis of water from the two domestic wells <br /> in the immediate vicinity of the excavation showed that <br /> BTEX, EDB, TPH--G, and oil & grease were below detection <br /> limits The cause of the presence of colof orm bacteria is <br /> not known, but is not associated with the presence of <br /> hydrocarbons <br /> CONCLUSIONS AND RECOMMENDATION <br /> Summarizing the above data indicates the following <br /> 1 ) The absence of the lighter hydrocarbon fractions supports <br /> the information provided that the UST has been out of <br /> service for many years <br /> 2) The highest levels detected were found on the south side <br /> of the excavation, closest to the locations of the removed <br /> UST and abandoned cesspool <br /> 3 ) The clayey nature of the sediments , the absence of the <br /> lighter hydrocarbon fractions , and the results of the <br /> chemical analysis of the domestic water wells indicates that <br /> 7 <br />