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CASTLE ANALYTICAL LABORATORY ' Environmental Testing Services P.O. Box 1360, Winton, CA 95388 Phone: (2091 384-2930 Fax: (2091384-1507 Advanced GeoEnvironmental, Inc. Client Project ID: 95-0197 Method: EPA 5030/8015M,8020 ' of Northern California Reference Number: 663 Instrument ID:Var-GC1 1803 West March Lane, Suite A Matrix: Soil Prepared: 2-6-96 Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 2-6-96 Attn: Tim Cuellar Reported: 2-7-96 QUALITY CONTROL DATA REPORT - ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration: 2.00 20.0 20.0 20.0 20.0 60.0 ' Units: mg/kg mg/kg mg/kg mglkg mglkg mg/kg LCS Batch #: VG-2066 VB-2066 VB-2066 VB-2066 VS-2066 VB-2066 LCS % Recovery: 108% 66.0% 95.0% 93.5% 99.0% 102% Surrogate Recovery: 104% 101% 1010/0 101% 101% 101% Control Limits: 70-130 % 60-130 % 70-130 % 70-130 % 70-130 % 70-130 % MS/MSD Batch #: VG-2066 V8-2066 V11-2066 VB-2066 VB-2066 VB-2066 tMS % Recovery: 135% 81.5% 104% 87.5% 107% 108% Surrogate Recovery: 120% 123% 123% 123% 123% 123% MSD % Recovery: 103% 80.5% 1080A 95.5% 115% 116% Surrogate Recovery: 91.7% 131% 131% 131% 131% 131% Relative % Difference: 25.4% 1.23% 4.16% 7.55% 6.56% 7.20% Methanol Blank : ND ND NO ND ND ND Surrogate Recovery: 101% 100% 100% 100% 100% 100% ' Please Note: The LCS (Laboratory Check Sample/ is a control sample of known, interferent free matrix that is fortified with representative analytes and analyzed using the same reagents, preparation and analytical methods employed for the samples. The LCS % recovery is used for validation 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 treject batch results. ' ANALYST: �yo/m � APPROVED BY: Clari J. Cone ' Phillips oLab Director