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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 Semivolatlles <br /> 1. This narrative covers the analysis of one soil sample for <br /> semivolatiles in accordance with EPA SW-846 Method 8270. <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. <br /> 1 6. The surrogate recoveries were within laboratory limits for the <br /> sample. The MS and MSD each had one high surrogate recovery. <br /> 7 . The matrix spike recoveries were within laboratory limits, <br /> although the recoveries for 2 , 4-dinitrotoluene were high in <br /> both the MS and the MSD. The RPD values were within the <br /> advisory range. <br /> ' W.C. McCurdy Date <br /> Unit Leader <br />