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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 /> Advanced GeoEnvironmental, Inc Client Protect ID Pacific Carwash Method EPA 5030/8015M 8020 <br />' of Northern California Reference Number 2000 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 1-27-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 1-27-99 <br /> Attn Tim Cuellar Reported 2-4-99 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 222 1 34 7112 1 84 9411 <br />' Units ug/L ug/L ug/L ug/L ug/L ug/L. <br /> LCS Batch # VW-1279 VW 1279 VW-1279 VW-1279 VW-1279 VW-1279 <br /> LCS % Recovery 120% 115% 114% 980% 103% 96 7% <br /> Surrogate Recovery 106% 102% 102% 102% 102% 102% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VW-1279 VW-1279 VW-1279 VW-1279 VW 1279 VW-1279 <br /> MS % Recovery 126% 96 0% 125% 108% 112% 106% <br /> Surrogate Recovery 110% 106% 106% 106% 106% 106% <br /> MSD % Recovery 126% 770% 113% 95 9% 99 6% 94 5% <br /> Surrogate Recovery 97 5% 941% 941% 941% 941% 941% <br /> Relative % Difference 00967% 134% 102% 114% 11 7% 11 5% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 996% 991% 99 1% 99 1% 99 1% 99 1% <br /> The LCS fl-aboratory 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 /> I <br /> ANALYST APPROVED BY <br /> Clary J Cone J Phillips <br /> Environmental Lab Director <br />