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' GORETm Surveys - Final Report <br /> ANALYTICAL PROCEDURES <br /> W.L. Gore&Associates' Screening Module Laboratory operates under the guidelines of its <br /> Quality Assurance Manual,Operating Procedures and Methods.The quality assurance program is <br /> consistent with Good Laboratory Practices (GLP)and ISO Guide 25, "General Requirements for <br /> the Competence of Calibration and Testing Laboratories", third edition, 1990. <br /> Instrumentation consists of state of the art gas chromatographs equipped with mass selective <br /> detectors, coupled with automated thermal desorption units. Sample preparation simply involves <br /> cutting the tip off the bottom of the sample module and transferring one or more exposed sorbent <br /> containers(sorbers, each containing engineered adsorbents)to a thermal desorption tube for <br /> analysis. Sorbers remain clean and protected from dirt,soil, and ground water by the <br /> insertion/retrieval cord, and require no further sample preparation. <br /> Analytical Method Quality Assurance: <br /> The analytical method employed is a modified EPA method 8260/8270. Before each run <br /> sequence,two instrument blanks, a sorber containing 5µg BFB (Bromofluorobenzene),and a <br /> method blank are analyzed. The BFB mass spectra must meet the criteria set forth in the method <br /> before samples can be analyzed. A method blank and a sorber containing BFB are also analyzed <br /> after every 30 samples and/or trip blanks. Standards containing the selected target compounds at <br /> five calibration levels are analyzed at the beginning of each run. The criterion for each target <br /> compound is less than 25%RSD (relative standard deviation). If this criterion is not met for any <br /> target compound,the analyst has the option of generating second-or third-order standard curves, <br /> ' as appropriate. A second-source reference standard,at a level of 10µg per target compound,is <br /> analyzed after every ten samples and/or trip blanks, and at the end of the run sequence. Positive <br /> identification of target compounds is determined by 1)the presence of the target ion and at least <br /> two secondary ions; 2)retention time versus reference standard; and, 3)the analyst's judgment. <br /> NOTE: All data have been archived. Any replicate sorbers not used in the initial analysis will <br /> be discarded fifteen(15)days from the date of analysis. <br /> iLaboratory analysis: thermal desorption,gas chromatography, mass selective detection <br /> Instrument ID: # 8 Chemist: DD <br /> 1 Compounds/mixtures requested: A10 <br /> Deviations from Standard Method: None <br /> Comments: Soil vapor analytes and abbreviations are tabulated in the Data Table Key(page 6). <br /> Page 3 of 5 <br /> GORE and designs are trademarks of W.L.Gore&Associates <br />