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1 CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 <br /> Certificate 472079 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M 8020 <br />' of Northern California Reference Number 2779 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 1-27-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 1-27-00 <br /> Attn Tim Cuellar Reported 2-2-00 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 222 1 34 762 1 84 948 <br />' Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-1270 VW-1270 VW-1270 VW-1270 VW-1270 VW-1270 <br /> LCS % Recovery 872% 693% 787% 763% 81 7% 734% <br /> Surrogate Recovery 934% 97 1% 971% 97 1% 97 1% 97 1% <br /> Control Limits 70-130% 70 130% 70-130% 70-130% 70-130% 70-130% <br /> MSIMSD Batch# VW-1270 VW-1270 VW-1270 VW-1270 VW-1270 VW-1270 <br /> Spike Concentration 110 222 1 34 7 82 1 84 948 <br /> MS %Recovery 737% 708% 684% 724% 770% 693% <br /> Surrogate Recovery 974% 944% 944% 944% 944% 944% <br /> MSD% Recovery 803% 743% 720% 77 1% 81 9% 737% <br />' Surrogate Recovery 992% 946% 946% 946% 946% 94 60/6 <br /> Relative % Difference 7 88% 286% 4 58% 595% 575% 5 81% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 939% 910% 91 0% 91 0% 910% 91 0% <br /> The LCS rLaboratory Check Samplpl 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 /> � � APPROVED BY <br /> ANALYST <br /> Clary J Cone Ja es C PhrNrps <br /> vrranme»taI Lab Director <br />