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.JUN-05-2000 16:20 OCWEN FEDERAL 1 561 682 8161 P.© '- 17 ,,,,, . �...-.0 rrJV iiwi. ,wii.li.. L� •J. L .a.._ JJ7-CSO-I LCO iU:""1CC7 fCll� F'.i�b'101b S of 6 GORE-SORBER®Screening Survey Final Report • QA/QC trip blank modules were provided to document contamination occurring that was not part of the soil gas signal of interest(i.e., impact during module shipment, installation and retrieval, and storage). The trip blanks are identically manufactured and packaged soil gas modules to those modules placed in the subsurface. However, the trip blanks remain unopened during all phases of the soil gas survey. Levels reported on the trip blanks may indicate potential impact to modules other than the contaminant source of interest. • Unresolved peak envelopes (UPEs) aro represented as a series of compound peaks clustered together around a central GC elution time in the total ion chromatogram. Typically, UPEs are indicative of complex fluid mixtures that are present in the subsurface. UPEs observed early in the chromatogram are considered to indicate the presence of more volatile fluids. while UPEs observed later in the chromatogram may indicate the presence of less volatile fluids. Multiple UP&may Indicate the presence of multiple complex fluids. Attenuation of the VOCJSVOC soil gas components may suggest the presence of a less volatile fluid, when in fact, a more volatile fluid existed but the volatile components have weathered away. Project Specific Comments: The minimum(gray)contour level for individually mapped target analytes is set at the maximum QA blank level observed or the method detection limit(NIDL), whichever is greater. For summed compounds,e.g.,BTEX, the minimum Contour level is arbitrarily set at 4.02 pg or the maximum blank level observed, whichever is greater. No MDL s exist for summed data. The maximum contour level is sat at the maximum value observed, by compound(s), • Stacked total ion chromarograms MCs)are included in Appendix A, The six digit serial number of each module is incorporated into the TIC Identification (e.g.: 123 56S.D represents module#121456 • No QA blank levels were reported. Thus,target analyte levels, reported for the field- installed modules, that exceed trip and method blank levels, and the method detection limits, have a high probability of origzna ing from on-site sourtres, • PCE was observed in the highest soil gas mass levels, followed by TCE. • The mapped spatial patterns indicated soil gas plumes extending along the eastern edge of the area sampled for soil gas. • The soil gag plumes appear to extend into areas of the site that were not sampled for soil gas. If the objective of tht soil gas survey was to delineate the nature and extent of the contamination, then additional soil gas sampling is recommended in those areas. Subsequent soil gas sampling events can be combined onto one set of maps providing increased resolution of the subsurface impact. CADRESOR13FR is a mgiatamd tm&ma&er W.r_Gore&i%- ateR.tee. Font 11 J" Rev 1&29Z