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�� <br />ROY F. WESTON, INC. <br />STOCKTON ANALYTICAL LABORATORY <br />ANALYTICAL CASE NARRATIVE <br />Client: CITY OF STOCKTON ENVCON <br />RFW #: 92085497 <br />Test: GC/MS Semivolatiles <br />1. This narrative covers the analysis of 1 water sample for semivolatiles in accordance <br />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 target analyte <br />interferences at or above the reporting limits. <br />4. The tuning and standard calibrations were within QC guidelines. <br />5. The internal standard areas and retention times were all within QC guidelines with <br />the exception of sample 3 TTO 1 L AMBER. <br />6. The surrogate recoveries were within laboratory limits. <br />7. The blank spike recoveries were within laboratory limits. <br />W.C. McCurdy Date <br />Unit Leader <br />