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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)3841507 <br /> Advanced GeoEnvrronmental Inc Client Project ID Pacific Carwash Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 4105 Instrument ID Var-GC1 <br /> 837 Shaw Road Matrix Water Prepared 10-4-01 <br /> Stockton,CA 95215 Analyst Jim Phillips Analyzed 10-4-01 <br /> Attn Tim Cuellar Reported 10-12-01 <br /> 1 QUALITY CONTROL. DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 1 32 794 1114 9 22 <br />' Units ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch# VW-0041 VW-0041 VW-0041 VW-0041 VW-0041 VW-0041 <br /> 103% 834% 117% 108% 116% 112% <br /> Surrogate Recovery 112% 108% 108% 108% 108% 108% <br /> Control Umlts 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> 1 MSIMSD Batch# VW-0041 VW-0041 VW-0041 VW-0041 VW-0041 VW-0041 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br />' MS% Recovery 523% 107% 103% 993% 389% 103% <br /> Surrogate Recovery 150% 119% 119% 119% 119% 119% <br /> MSD% Recovery 458% 1112% 105% 996% 372% 103% <br /> Surrogate Recovery 143% 113% 113% 113% 113% 113% <br /> Relative%Difference 1 11% 38 1% 136% 029% 1 51% 0 030/0, <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 /> reject batch results <br /> • / � y <br />' ANALYST A APPROVED BY <br /> Cla J C e Ja5xKs-C Phillips <br /> boratory Director <br /> 1 <br />