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L CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P.O. Box 1360,Winton, CA 95388 Phone: (209) 384.2930 <br /> Fax: 1209) 384.1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID:95.0192 Method: EPA 5030/C015M,8020 <br /> L of Northern California Reference Number: 683 Instrument ID:Var-GC1 <br /> 1803 West March Lane, Suite A Matrix:Soil Prepared: 2-26-96 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 2-26-96 <br /> Attn:Tim Cuellar Reported: 2-29-96 <br /> L <br /> QUALITY CONTROL DATA REPORT <br /> LANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> LSpike Concentration: 2.00 . 20.0 20.0 20.0 40.0 <br /> LUnits: mg/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch#: VG-2266 VB-2266 VB-2266 VB-2266 VS-2266 <br /> L LCS % Recovery: 99.6% 96.5% 92.0% 98.5% 96.8% <br /> Surrogate Recovery: 96.2% 118% 118% 118% 118% <br /> Control Limits: 70-130 % 70-130 % 70-130% 70-130 % 70-130 % <br /> LMS/MSD Batch#: VG-2266 VB-2266 VB-2266 VB-2266 VS-2266 <br /> L MS %Recovery: 87.3% 77.5% 69.5% 80.5% 78.5% <br /> Surrogate Recovery: 85.4% 87.6% 87.6% 87.6% 87.6% <br /> L MSD % Recovery: 84.3% 78.5% 70.5% 81.5% 78.5% <br /> Surrogate Recovery: 82.0% 93.3% 93.3% 93.3% 93.3% <br /> Relative % Difference: 3.44% 1.23% 1.28% 1.20% 0.000% <br /> L Methanol Blank : NO NO ND ND NO <br /> Surrogate Recovery: 120% 116% 116% 116% 116% <br /> L <br /> Please Note: <br /> L 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 /> L ANALYST: APPROVED BY: / <br /> Clavi J. cov J as C. Phillips <br /> nvironmental Lab Director <br /> L <br /> L <br />