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detect most partially-oxygenated hydrocarbons (e.g. , ketones ) , <br /> chlorinated hydrocarbons (e.g. , trichloroethylene ) , and nitrogen- <br /> containing compounds, but the response to these ranges between <br /> poor and good. It generally cannot readily detect water or fully <br /> oxygenated compounds (e.g. , carbon dioxide ) . <br /> 2 . 2 SVCA RESULTS <br /> The results of the investigation (Appendix B ) are summarized in <br /> Table 1 . No aromatics were found at levels above detection ( 1 <br /> ppm) , and the low levels ( 2-6 .ppm) of volatile hydrocarbons <br /> detected consisted entirely of low-molecular-weight, low-boiling- <br /> point hydrocarbon( s ) . These small hydrocarbons do not appear to <br /> be concentrated in a particular area of the site. To determine <br /> the relative molecular weights of the early-eluting components, <br /> methane standards (Table 2 ) were run on the gas chromatograph <br /> (GC ) . The absence of a significant level of methane in any of <br /> the samples suggests that active anaerobic biodegradation is not <br /> occurring at the site. Comparing these results with those of <br /> another study (Appendix C ) , the component of interest appears in <br /> the chromatogram at the same retention time as butane. Although <br /> the resolving capacity for hydrocarbon constituents of the HNU <br /> 421 GC is quite high, gas chromatography-mass spectrometry would <br /> be required to identify the component( s ) positively. <br /> c40/90265 7 <br />