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TUN-05-2000 16: 19 OCWEN FEDERAL 1 561 682 8161 P.UC.'1^ <br /> rKUM: IWIN ING I ^3S, INC. 559-Z6H-712 C 9829'2119 P.005'016 <br /> 4of6 <br /> GORE-SORBEe Screening Survey <br /> Final Report <br /> DATA TABULATION <br /> # CONTOUR MAPS ENCLOSED: Three B-sized color contour maps <br /> LIST OF MAPS ENCLOSED; <br /> • Tetrachlornethene(PCE) <br /> • Trichloroethene(TCE) <br /> • cis-&trans-1,2-Dichlorcethene (cis-&trarts-1,2-1)(M) <br /> NOTE: All dwa values presented In Appeaft A mprlscht neo oroomponw(s)dcaorbcd tram ti;GORBrSORBER <br /> Scmaing Modulen re dv*d mod aualyaW by W.L.Gore,as ldertltled In the Chale or CW Wdy(Appendix A). The <br /> menuviduat traceability and instrument performance an mproduelble and accurate for The trmasvrcment procca <br /> documented. SeMi-quantitation Of the cvmpamW man is based on either a sldgk-level(QA Lova!1)or three tevct(QA <br /> t errl Z)standard c0bratiaa. <br /> General Comments: <br /> • This survey reports soil gas mass levels present in the vapor pbase. Vapors are subject to a <br /> variety of attenuation factors during migration away from the source concentration to the <br /> module, Thus, mass levels repotted from the module will often be less than concentrations <br /> reported in soil and groundwater matrix data. In most instances, the soil gas masses reported <br /> on the modules compare favorably with concentrations reported in the soil or groundwater <br /> (e.g., where soil gas levels are reported at greater levels relative to other sampled locations <br /> on the site, matrix data should reveal the same pattern,acrd vice versa). However, due to a <br /> variety of factors, a perfect comparison between matrix data and soil gas levels can rarely be <br /> achieved. <br /> • Soil gas signals reported by this method cannot be identified to soil adsorbed, groundwater, <br /> and/or free-product contatnination. The soil gas signal reported from each module can <br /> evolve from all of these sources, Differt:ntiatioty between soil and groundwater <br /> contamination can only be achieved with prior knowledge of the site history(i.e., the site is <br /> known to have groundwater contamination only). <br /> • Currently, soil gas surveys are not designed to replace Soil or groundwater matrix Sampling, <br /> Following a soil gas survey, matrix sampling is recommended in select areas to establish the <br /> nature of the contamination(i.e., soil, groundwater, or both), and the relationship to the soil <br /> gas levels_ <br /> FORM 11 aJ <br /> Xes ra1566 <br />