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I S <br /> 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 /> Advanced GeoEnvironmental, Inc Client Project ID Three B's Truck Plaza Method EPA 503018015M 8020 <br />' of Northern California Reference Number 2854 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 2-26-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 2-26-00 <br /> Attn Tim Cuellar Reported 3-9-00 <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 84 948 <br />' Units uglL ug/L ug1L ug/l_ ug1L ug1L <br /> LCS Batch# VW-2260 VW-2260 VW-2260 VW-2260 VW-2260 VW-2260 <br />' LCS % Recovery 966% 112% 829% 823% 899% 801% <br /> fpSurrogate Recovery 107% 103% 103% 103% 103% 103% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-2260 VW-2260 VW-2260 VW-2260 VW-2260 VW-2260 <br /> Spike Concentration 110 222 1 34 7 82 1 84 948 <br />' MS %Recovery 110% 939% 822% 803% 854% 776% <br /> Surrogate Recovery 107% 100% 100% 100% 100% 100% <br /> MSD%Recovery 108% 954% 837% 820% 877% 800% <br />' Surrogate Recovery 106% 104% 104% 104% 104% 104% <br /> Relative%Difference 1 33% 1 58% 171% 203% 259% 298% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 111% 105% 105% 105% 105% 105% <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 acceptor <br /> re)ect batch results <br /> ANALYST APPROVED BY <br /> l�! <br /> Clan J Cone jar#s C Phillips <br /> EaVironmental Lab Director <br />