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l%y <br /> oam" <br /> rNo chlorobenzis <br /> ene or dichlorobensenea �ult do" not agree ? <br /> II (°'•`• at a limit of detection Of 0.1 ug/g. <br /> with results of analyses of *amiss previously aallacted at this i1 <br /> site b American Env m ental Management and analyzed by 8ureka <br /> Laboratories (Report to American E ir° l management Corp. *:t <br /> from Eureka Laboratories dated July 6, 19861). because there are <br /> t which appear in the ' <br /> so many petroleum related compounds <br /> chromatograms from these samples, and because the photoionisation <br /> detector it non-specific detector, a miss-identification of the <br /> analytes o ld have occurred in the previous determination k <br /> confirmatory ory work was done at that time. To confirm the absence <br /> of chlorinated materials in these samples, 'in addition s <br /> ion <br /> analyses with the mass selective detector in the specilia s; <br /> e, extracts from four11 <br /> modo! the samples were analyzed by high <br /> j resolution gas chromatography/mass spectrometry <br /> Ho halogenated <br /> materials were defeated. Results from samples fortified with <br /> chlorobenzane and the dichlorobenzene, discussed below under <br /> { Quality Assurance show that these oomponnds would have been y i <br /> detected it they had been present in the samples. <br /> i+ <br /> G <br /> 8eause the soil cores were not homogenized before sub-sampling <br /> to prevent loss of volatile components some variability in ` <br /> results of analyses of sub-samples from the same core was <br /> expected To determine the variability ini?theanallsis for the <br /> components of interest, duplicate sub-samples of four of the soil <br /> cores were extracted and analyzed, Results of�analysis <br /> extracts from duplicate sub-samples from tihe same cora shh <br /> ow up to a <br /> approximately 50% variation in levels of analytes, measured. <br /> F <br /> To confirm that the extraction and analysis sethodsi th S <br /> samples were valid for the analytes Of interest, <br /> s of <br /> several cores were •fortitied with diesel and the aramtia <br /> volatile hydrocarbons prior to extraction, and 'analysis• Pour <br /> sub-samples of soil from the towers used for ito�rtifi3 Which In <br /> { <br /> contained none of the analytes <br /> addition, a sub-sample of the 30' section of A-1 which had been ! <br /> shown to contain diesel and several of the aromatic volatile <br /> hydrocarbons was also fortified. Results. spawn in Table 2 i 1 <br /> indicate that recoveries were satisfactory !or all analytes- <br /> y 1 <br /> D ane G. G ahem; supervisor <br /> Physical/Environnental <br /> Analytical section R <br /> Sabr na C. Leun4.Pr Res t <br /> physical/Environmentx.l <br /> Analytical section <br />