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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 1209) 384-2930 <br />' Certificate #2079 Fax 1209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 2007 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 2-1-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 2-1-99 <br /> Attn Tim Cuellar Reported 2-12-99 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 222 1 34 782 1 84 948 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L. <br /> LCS Batch # VW-2019 VW-2019 VW-2019 VW-2019 VW-2019 VW-2019 <br /> LCS % Recovery 113% 104% 113% 101% 107% 948% <br /> Surrogate Recovery 106% 102% 102% 102% 102% 102% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 °/a 70-130 % 70-130 % <br /> MS/MSD Batch # VW-2019 VW 2019 VW-2019 VW 2019 VW-2019 VW-2019 <br /> MS % Recovery 118% 764% 106% 102% 107% 997% <br /> Surrogate Recovery 108% 104% 1041/1. 104% 104% 104% <br />' MSD % Recovery 116% 770% 106% 100% 107% 984% <br /> Surrogate Recovery 111% 107% 107% 107% 107% 107% <br />' Relative % Difference 1 14% 1 58% 0 201% 1 39% 0351% 1 22% <br />' Methanol Blank ND ND ND NO ND ND <br /> Surrogate Recovery 101% 101% 101% 101% 101% 101% <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 /> Ir <br /> F -ti <br />' ANALYST APPROVED BY <br /> Clary J Cone J89prc illrps <br /> vuonmenta/Lab Director <br />