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4 <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Top Filling Station Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 5793 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 06-11-03 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 06-11-03 <br /> Attn Tim Cuellar Reported 06-18-03 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 1 32 7 94 1 84 922 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-6133 VW-6133 VW-6133 VW-6133 VW-6133 VW-6133 <br /> 91 9% 597% 617% 854% 107% 104% <br /> Surrogate Recovery 109% 108% 108% 108% 108% 108% <br /> IControl Limits 70-130% 70-150% 70-130% 70-130% 70-130% 70-130% <br /> IMS/MSD Batch# VW-6133 VW-6133 VW-6133 VW-6133 VW-6133 VW-6133 <br /> Spike Concentration 110 2 10 1 32 7 94 1 84 922 <br /> MS % Recovery 91 1% 714% 591% 822% 990% 979% <br /> Surrogate Recovery 993% 985% 985% 985% 985% 985% <br /> MSD% Recovery 880% 603% 626% 812% 956% 940% <br /> Surrogate Recovery 101% 101% 101% 101% 101% 101% <br /> Relative% Difference 339% 169% 554% 1 16% 339% 405% <br /> Methanol Blank ND NO ND NO ND NO <br /> Surrogate Recovery 101% 104% 104% 104% 104% 104% <br /> 1 <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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> I <br /> IANALYST `Y APPROVED BY <br /> Cla J Cone Ja s Phillips <br /> boratory Director <br /> I <br />