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0 0 <br />ROY F. WESTON, INC. <br />STOCKTON ANALYTICAL LABORATORY <br />ANALYTICAL CASE NARRATIVE <br />Client: CITY OF STOCKTON <br />RFW #: 92085497 <br />Test: GC/MS Volatiles <br />1. This narrative covers the analysis of one water sample for volatiles in accordance <br />with EPA SW -846 Method 8240. <br />2. All required hold times were met with the exception of the dilution of the sample. <br />The original run was in hold. <br />3. The method blank associated with these samples was free from targe* �:nalyte <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. <br />6. The surrogate recoveries were within laboratory limits. <br />7. The blank spike recoveries and RPD values were within laboratory limits with, t;e <br />exception of the RPD value of 1,1-dichloroethene. <br />W.C. McCurdy <br />Unit Leader <br />P --Lf 4-'9 z - <br />Date <br />