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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater CA 95301 Phone (209) 384-2930 <br /> Certificate#2079 Fax (209) 384-1507 <br /> I Advanced Geo Env iron mental Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 2965 Instrument ED Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 4-21-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 4-21-00 <br /> Attn Tim Cuellar Reported 4-27-00 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 222 1 34 782 1 84 948 <br /> Unrts uglL ug/L uglL ug/L uglL ug/L <br /> LCS Batch# VW-4210 VW 4210 VW-4210 VW 4210 VW-4210 VW-4210 <br /> LCS % Recovery 116% 127% 111% 101% 104% 965% <br /> Surrogate Recovery 111% 107% 107% 1D7% 107% 107% <br /> Control LEmlts 70-130% 70-130% 70-130% 70-130 % 70-130% 70-130% <br /> MS/MSD Batch# VW-4210 VW 4210 VW 4210 VW-4210 VW 4210 VW 4210 <br /> Spike Concentration 110 222 1 34 782 1 84 948 <br /> MS % Recovery 108% 119% 92 5% 103% 108% 100% <br /> Surrogate Recovery 112% 108% 108% 108% 108% 108% <br /> MSD % Recovery 118% 116% 993% 983% 104% 968% <br /> Surrogate Recovery 110% 107% 107% 107% 107% 107% <br /> Relative % Difference 7 81% 233% 3 31% 349% 2 52% 2 82% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 102% 101% 101% 101% 101% 101% <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 /> cr sample batch results Due to matrix effects the QC limits and recoveries for MSIMSD s are advisory only and are not used to accent or <br /> reject batch results <br /> APhillupZS ANALYST � � APPROVED BYClal Cone / Janks <br /> r/ Erl4ironmental Lab Director <br />