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• CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P 0 Box 1360, Winton, CA 95388 Phone (209) 364-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvuonmental, Inc Client Project ID Joe's Truck Stop Method EPA 503018015M,8020 <br /> of Northern California Reference Number 990 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 1-17-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 1-17-97 <br /> Attn Kevin McKibben Reported 1-17-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 100 1 00 1 00 1 00 1 00 200 <br /> IUnits ug/L uglL ug/L ug/L ug1L uglL <br /> LCS Batch # VG 1177W VB 1177W VB-1177W VB-1177W VB-1 177W VB-1177W <br /> LCSA % Recovery 103% 104% 107% 109% 107% 108% <br /> Surrogate Recovery 102% 97 6% 976% 976% 97 6% 97 6% <br /> LCS$ % Recovery 104% 104% 113% 1 18% 111% 115% <br /> Surrogate Recovery 102% 1000/0 100% 100% 100% 100% <br /> Relative % Difference 1 29% 0249% 5 61% 852% 3 48% 676% <br />' Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70130 % <br /> MS/MSD Batch # VG-1177W VB-1177W VB-1177W VB-1177W VS 1177W VB-1177W <br /> I MS % Recovery NA' NA* NA* NA* NA* NA* <br /> Surrogate Recovery NA* NA* NA* NA* NA* NA* <br />' MSD % Recovery NA* NA* NA* NA* NA* NA* <br /> Surrogate Recovery NA* NA* NA* NA* NA* NA* <br /> Relative % Difference NA* NA* NA* NA* NA* NA* <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 108% 95 ,1% 95 8% 9511% 9111% 9511% <br /> *MS and MSD not analyzed due to matrix interference, duplicate control spikes analyzed <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 accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> C arj J cone Ja Phillips <br />' EfKironmentat Lab Director <br />