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Al <br /> ti <br /> a <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384 2930 <br /> Certificate #2079 Fax (209) 364 1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Top Filling Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 2314 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 6-16-99 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 6-16 99 <br /> Attn Tim Cuellar Reported 623-99 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 222 1 34 7 82 1 84 9 48 <br /> Units ug1L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch # VW-6169 VW-6169 VW-6169 VW-6169 VW-6169 VW-6169 <br /> LCS % Recovery 106% 823% 110% 100% 104% 92 0% <br /> Surrogate Recovery 104% 101% 101% 101% 101% 101% <br />. Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VW 6169 VW-6169 VW-6169 VW-6169 VW-6169 VW 6169 <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 943 <br /> MS % Recovery 110% 115% 118% 111% 114% 102% <br /> Surrogate Recovery 116% ill% 1 1 1% ill% ill% 111% <br /> MSD % Recovery 102% 822% 112% 103% 108% 96 1% <br /> Surrogate Recovery 111% 107% 107% 107% 107% 107% <br /> Relative % Difference 6 73% 31 4% 5 16% 6 92% 5 52% 5 80% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 103% 102% 102% 102% 102% 102% <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS % recovery is used for validation <br /> of sample batch results Due to matrix effects, the QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> refect batch results <br /> ANALYST Lti APPROVED B <br /> Clam J Cone James Phr!lrps <br /> Envrronmenta!Lab Director <br />