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Terminology <br /> In order to prevent misunderstanding of certain terms used in <br /> this report, the following clarifications are offered: <br /> The tern, "feature" is used in reference to a discernable. <br /> T pattern in the contoured data. It denotes a contour form rather <br /> than a definite or separate chemical occurrence. <br /> The term "occurrence" is used to indicate an area where chem- <br /> ical compounds are present in sufficient concentrations to be de- <br /> tected by the analysis of soil vapors. The term is not indicative <br /> of any specific mode of occurrence: (vapor, dissolved, etc) , and <br /> does not necessarily indicate or suggest the presence of "free <br /> product" or "phase-separated hydrocarbons". <br /> The term "trace level" represents a concentration that is <br /> detectable but <br /> is less than the formal detection limit of the <br /> analytical equipment. A statistically valid quantification of <br /> trace levels is not possible. <br /> The term "analyte" refers to any of the hydrocarbons standard- <br /> ized for quantification in the chromatographic analysis. <br /> The term "vadose zone" represents the unsaturated zone between <br /> w. <br /> the ground water table and the ,ground surface. <br /> The term "indicates" is used when evidence dictates a unique <br /> conclusion. The term "suggests" is used when several explanations <br /> " of certain evidence are <br /> passible, but one in particular seems more <br /> likely. As a result, "indicates" carries a higher degree of <br /> a <br /> confidence in a conclusion than does "suggests". <br /> i� <br /> r <br />