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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P.O. Box 1360, Winton, CA 95388 Phone: (209) 384-2930 <br /> Fax: (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: Flag City Chevron Method: EPA 503018015M,8020 <br /> of Northern California Reference Number: 811 Instrument ID: Var-GC1 <br /> I 1803 West March Lane, Suite A Matrix: Soil Prepared: 7-22-96 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 7.22-96 <br /> Attn: Tim Cuellar Reported: 7-24-96 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration: 2.00 20.0 20.0 20.0 40.0 <br /> Units: mg/kg uglkg ug/kg ug/kg uglkg <br />' LCS Batch #: VG-7226 VB-7226 VB-7226 VB-7226 VB-7226 <br />' LCS % Recovery: 111°% 99.4% 100% 99.3% 100% <br /> Surrogate Recovery: 104°% 104% 104°% 104% 104% <br /> Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MSIMSD Batch #: VG-7226 VS-7226 VB-7226 VB-7226 VB-7226 <br />' MS % Recovery: 72.0°% 58.9% 79.5°% 76.2°% 84.9°% <br /> Surrogate Recovery: 79.1% 73.4% 73.4°% 73.4% 73.4°% <br /> MSD % Recovery: 73.1% 58.6°% 79.7°% 77.8°% 86.7°% <br /> Surrogate Recovery: 78.9°% 75.7°% 75.7°% 75.7% 75.7°% <br /> Relative % Difference: 1.38% 0.530°% 0.218°% 2.17°% 2.01% <br />' Methanol Blank : ND ND ND ND ND <br /> Surrogate Recovery: 95.9°% 96.9°% 96.9% 96.9°% 96.9°% <br /> 1 <br /> Please Note: <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 MSlMSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> 1 <br /> ANALYST: APPROVED BY: <br />' Clar!J. Cone Ja s rIlips <br /> nvironmental Cab Director <br />