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r r,` s <br /> Terminolo <br /> In order to prevent misunderstanding of certain terms used in <br /> this report, the following clarifications are offered: <br /> The term "feature" is used inreference to a discernable <br /> pattern in the contoured data. It denotes a contour form rather <br /> than a definite or separate chemical occurrence. <br /> . •M <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 net indicative <br /> Of anv specific mode of occurrence (vapor, dissolved, etc) , and <br /> t <br /> I-. <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 is less than the formal detection limit of the <br /> -�� <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 /> - r� <br /> ized for quantification in the chromatographic analysis. <br /> r^ The term "vadose zone" represents the unsaturated zone between <br /> the ground water table and the ground surface. <br /> The term "indicates" is used when evidence dictates a unique <br /> conclusion. The terra "suggests" is used when several explavaations <br /> of certain evidence are possible, but one in particular seems more <br /> likely. As a result, "indicates" carries a higher degree of <br /> confidence in a conclusion than does "suggests". <br /> 3 <br />