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L CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P.O. Box f360,Winton, CA 95388 Phos: (209) 384-2930 <br /> LFax: (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID:95-0152 Me.hod:EPA 503018015M,8020 <br /> L of Northern California Reference Number: 615 Instrument ID:Var-GC1 <br /> 1803 West March Lane, Suite A Matrix:Soil Prepared: 12-19-95 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 12-20-95 <br /> Atm:Tim Cuellar Reported: 12-21-95 <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-D195 VB-D195 VB-D195 VB-D195 VB-D195 <br /> L LCS %Recovery: 95.3% 93.0% 92.5% 87.5% 91.0% <br /> Surrogate Recovery: 113% 111% 111% 111% 111% <br /> Control Limits: 70-130 % 70-130% 70-130% 70-130 % 70-130 % <br /> LMS/MSD Batch#: VG-D195 VB-D195 VB-D195 VB-D195 VB-D195 <br /> L MS%Recovery: 69.2% 79.0% 80.0% 75.5% 78.3% <br /> Surrogate Recovery: 92.9% 97.4% 97.4% 97.4% 97.4% <br /> L MSD%Recovery: 74.1% 70.5% 74.0% 71.5% 74.3% <br /> Surrogate Recovery: 98.4% 93.1% 93.1% 93.1% 93.1% <br /> Relative% Difference: 6.74% 10.7% 7.10% 5.33% 4.97% <br /> L Methanol Blank : NO ND ND NO NO <br /> Surrogate Recovery: 114% 115% 115% 115% 115% <br /> L <br /> Please Note: <br /> LThe 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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> L <br /> L ANALYST: t� APPROVED BY: <br /> Cleri J. ConeJ as <br /> C Phillips <br /> nvima nmental Lab Director <br /> L <br /> 1. <br />