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GORE TM Surveys -Final Report <br /> DATA TABULATION <br /> # CONTOUR MAPS ENCLOSED: Three(3)B-sized color contour maps <br /> LIST OF MAPS ENCLOSED: <br /> • Tetrachloroethene(PCE) <br /> ' Trichloroethene(TCE) <br /> • cis-1,2-dichloroethene(c12DCE) <br /> NOTE: All data values presented in Appendix A represent masses of compound(s) <br /> desorbed from the GORET"'Modules received and analyzed by W.L.Gore&Associates, <br /> Inc., as identified in the Chain of Custody(Appendix A). The measurement traceability and <br /> ' instrument performance are reproducible and accurate for the measurement process <br /> documented. Semi-quantitation of the compound mass is based on a five-level standard <br /> calibration. <br /> rGeneral Comments: <br /> • This survey reports soil gas mass levels present in the vapor phase. Vapors are <br /> subject to a variety of attenuation factors during migration away from the source <br /> concentration to the module. Thus, mass levels reported from the module will often <br /> be less than concentrations reported in soil and groundwater matrix data. In most <br /> 1 instances, the soil gas masses reported on the modules compare favorably with <br /> concentrations reported in the soil or groundwater(e.g., where soil gas levels are <br /> reported at greater levels relative to other sampled locations on the site, matrix data <br /> should reveal the same pattern, and vice versa). However, due to a variety of factors, <br /> a perfect comparison between matrix data and soil gas levels can rarely be achieved. <br /> • Soil gas signals reported by this method cannot be identified specifically to soil <br /> adsorbed, groundwater, and/or free-product contamination. The soil gas signal <br /> reported from each module can evolve from all of these sources. Differentiation <br /> between soil and groundwater contamination can only be achieved with prior <br /> knowledge of the site history(i.e.,the site is known to have groundwater <br /> contamination only). <br /> • QA/QC trip blank modules were provided to document potential exposures that were <br /> not part of the soil gas signal of interest (i.e., impact during module shipment, <br /> installation and retrieval, and storage). The trip blanks are identically manufactured <br /> and packaged soil gas modules to those modules placed in the subsurface. However, <br /> the trip blanks remain unopened during all phases of the soil gas survey. Levels <br /> reported on the trip blanks may indicate potential impact to modules other than the <br /> contaminant source of interest. <br /> Page 4 of 5 <br /> 1 GORE and designs are trademarks of W.L Gore&Associates <br />