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ROY F. WESTON, INC. <br /> STOCKTON ANALYTICAL LABORATORY <br /> ANALYTICAL CASE NARRATIVE <br /> Client: Treatek <br /> RFW #: 9112S471 <br /> Test: GC/MS Volatiles <br /> 1. This narrative covers the analysis of one soil sample for <br /> volatiles in accordance with EPA SW--846 Method 8240 . <br /> 2 . All required hold times were met. <br /> 3 . The method blank associated with these samples was free from <br /> target analyte interferences at or above the reporting limits. <br /> 4 . The tuning and standard calibrations were within QC <br /> guidelines. <br /> 5 . The internal standard areas and retention times were all <br /> within QC guidelines, with the exception of one internal <br /> ' standard area in the MSD. The sample and the MS were on the <br /> low side of the advisory range, demonstrating a matrix effect. <br /> 6 . The surrogate recoveries were within laboratory limits for the <br /> sample. The MS and MSD had high surrogate recoveries, which <br /> was most likely due to a matrix effect, as the sample <br /> recoveries were on the high side of the advisory range. <br /> 7 . The matrix spike recoveries were within laboratory limits, <br /> although the recoveries for trichloroethene, toluene and <br /> chlorobenzene were high in the MSD. The RPD values were <br /> within the advisory range. <br /> U1lttUr- l L - li- �P/ <br /> W. C. McCurdy Date <br /> Unit Leader <br />