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C ca U CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 CFax: (209) 384-1507 Advanced GeoEnvironmental, Inc. Client Project ID: Burkhardt property Method: EPA 5030/8015M,8020 C of Northern California Reference Number: 1488 Instrument ID: Var-GC1 4005 N. Wilson Way Matrix: Soil Prepared: 3-12-98 Stockton, CA 95205 Analyst: Clavi Cone Analyzed: 3-13-98 CAttn: Tim Cuellar Reported: 3-18-98 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes CSpike Concentration: 2.00 20.0 20.0 20.0 20.0 40.0 Units: mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg it �» LCS;Batch q: VG-3128 VB-3128 VB-3128 VB-3128 VB-3128 V13-3128 e LCS % Recovery: 89.1% ill% 106% 98.9% 104% 96.7% L Surrogate Recovery: 90.9% 90.5% 90.5% 90.5% 90.5% 90.5% Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % IrL•i MS/MSD Batch N: VG-3128 VB-3128 VB-3128 VB-3128 VB-3128 VB-3128 MS % Recovery: 77.1% 113% 81.3% 79.9% 82.0% 86.5% Surrogate Recovery: 85.3% 83.6% 83.6% 83.6% 83.6% 83.6% MSD % Recovery:. 68.7% 83.3% 84.0% 79.6% 81.4% 84.6% Surrogate Recovery: 85.7% 85.0% 85.0% 85.0% 85.0% 85.0% Relative % Difference: 11.3% 29.9% 3.07% 0.338% 0.720% 2.15% ! Methanol Blank : NO NO NO NO ND NO 1� Surrogate Recovery: 89.9% 89.4% 89.4% 89.4%. 89.4% 89.4% 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 MS/MSD's are advisory only and are not used to accept or reject batch results. C - ; C ANALYST; APPROVED BY: 1 ri J. Cone J3pigs r.-Phillrps nvironmenta/Lab Director l J 1