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1 4 of 6 GORE-SORBEe Screening Survey Final Report DATA TABULATION 1 4 CONTOUR MAPS ENCLOSED: Four(4)B-sized color contour maps LIST OF MAPS ENCLOSED- Benzene,Toluene,Ethyl benzene, and total Xylenes (BTEX) • Methyl tert-Butyl Ether(MtBE) t + Gasoline-Range Petroleum Hydrocarbons(GRPH) • Diesel-Range Petroleum Hydrocarbons(DRPH) ' NOTE All data values presented in Appendix A represent masses of compound(s)desorbed from the GORE-SORBER Screening Modules received and analyzed by W L Gore&Associates,Inc,as identified in the Chain of Custody (Appendix A) The measurement traceability and instrument performance are reproducible and accurate for the measurement process documented Semi-quantitation of the compound mass is based on either a single-level(QA Level ' 1)or three-level(QA Level 2)standard calibration General Comments. • This survey reports soil gas mass levels present 1n the vapor phase Vapors are subject to a variety of attenuation factors during migration away from the source concentration to the module Thus, mass levels reported from the module will often be less than concentrations reported in soil and groundwater matrix data In most instances, the soil gas masses reported on the modules compare favorably with concentrations reported in the soil or groundwater (e g , where soil gas levels are reported at greater levels relative to other sampled locations ' on the site, matrix data should reveal the same pattern, and vice versa) However, due to a variety of factors, a perfect comparison between matrix data and soil gas levels can rarely be achieved ' Soil gas signals reported by this method cannot be identified specifically to soil adsorbed, groundwater, and/or free-product contamination The soil gas signal reported from each module can evolve from all of these sources Differentiation between soil and groundwater ' contammation can only be achieved with prior knowledge of the site history(i e , the site is known to have groundwater contamination only) • QA/QC tnp blank modules were provided to document potential exposures that were not ' part of the soil gas signal of interest (r 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 GORE-SORBER is a registered trademark and service mark of W L Gore&Associates