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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 1209! 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnwronmental, Inc Client Project ID Cal Fuels Method EPA 503018015M,8020 <br /> of Northern California Reference Number 1677 instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 7-27-98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 7-27-98 <br /> IAttn Tim Cuellar Reported 7-29-98 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 100 100 1 00 1 00 1 00 200 <br /> Units ug/L ug/L ug/L ug/L ug/L ug1L <br /> LCS Batch # VG-7278W VB-7278W VB-7278W VB-7278W VB-7278W VB-7278W <br /> LCS % Recovery 108% 866% 95 1% 101% 95 5% 968% <br /> Surrogate Recovery 96 3% 908% 908% 908% 908% 908% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70130 % 70-130 % 70-130 % <br /> MS/MSI] Batch # VG-7278W VB-7278W VB-7278W VB 7278W VB-7278W VB-7278W <br /> MS % Recovery 104% 107% 972% 102% 103% 103% <br /> Surrogate Recovery 102% 98 9% 989% 989% 989% 989% <br /> MSD % Recovery 106% 122% 946% 974% 102% 101% <br /> Surrogate Recovery 989% 969% 969% 969% 969% 969% <br /> Relative % Difference 2 41% 105% 266% 475% 0317% 232% <br /> r <br /> Methanol Blank ND ND ND ND ND NO <br /> Surrogate Recovery 945% 993% 99 3% 99 3% 993% 993% <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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> —0flz <br /> ANALYST �VdAPPROVED BY 1 <br /> Clan J Cone Ja s rI rps <br /> vironmental Lab Director <br />