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1 <br /> 5 of 6 <br /> GORE-SORBEO Screening Survey <br /> ' Final Report <br /> • Unresolved peak envelopes (UPEs) are represented as a series of compound peaks clustered <br /> ' together around a central gas chromatograph elution time in the total ion chromatogram <br /> Typically, UPEs are indicative of complex fluid mixtures that are present in the subsurface <br /> UPEs observed early in the chromatogram are considered to indicate the presence of more <br /> volatile fluids, while UPEs observed later in the chromatogram,may indicate the presence of <br /> less volatile fluids Multiple UPEs may indicate the presence of multiple complex fluids <br /> Project Specific Comments• <br /> • The minimum (gray) contour level, for each mapped analyte or group of analytes, was set at <br /> the maximum blank level observed or the method detection limit, whichever was greater <br /> ' When target compounds are summed together(1 e , BTEX),the contour minimum is <br /> arbitrarily set at 0 02 gg or the maximum blank level, whichever 1s greater The maximum <br /> contour level was set at the maximum value observed <br /> ' Stacked total fon chromatograms (TICS) are included in Appendix A The six-digit serial <br /> number of each module is incorporated into the TIC identification (e g 1234565 D <br /> represents module #123456) <br /> • GRPH and DRPH were observed on the trip blanks and the method blanks in background <br /> levels No other target analytes were observed on the QA blanks Thus, target analyte <br /> levels reported for the field-installed modules that exceed trip and method blank levels, and <br /> ' the analyte method detection limit, have a high probability of originating from on-site <br /> sources <br /> • The mapped spatial patterns indicated areas of elevated soil gas mass along the western edge <br /> tof the area sampled A fairly well-defined BTEX plume was observed A map of MtBE <br /> was requested, but no MtBE was observed in the soil gas, therefore, a gray map was <br /> ' generated <br /> • If the objective of the soil gas survey was to delineate the nature and extent of the <br /> contamination, then additional soil gas sampling is recommended in those areas where the <br /> ' color contours appear to extend into unsampled areas Subsequent sampling events can be <br /> combined with the data from this event and mapped together to provide greater coverage <br /> t <br /> GORE-SORBER is a registered trademark and service mark of W L Gore&Associates <br />