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L CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 3842930 L Fax: (209) 384-1507 Advanced GeoEnvironmental, Inc. Client Project ID:Yellow Cab Method: EPA 5030/8015M,8020 L of Northam California Reference Number: 1485 Instrument ID:Var-GC1 4005 N.Wilson Way Matrix:Soil Prepared: 3-10-98 Stockton,CA 95205 Analyst: Clari Cone Analyzed: 3-12-98 Attn:Tim Cuellar Reported: 3-18-98 QUALITY CONTROL DATA REPORT L ANALYTE Gasoline MT BE Benzene Toluene Ethyl Benzene Total Xylenes Spike 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 LCS Batch#: VG-3108 VB-3108 VB-3108 VB-3108 VS-3108 VB-3108 L LCS %Recovery: 90.2% 95.3% 95.6% 93.9% 89.2% 91.1% Surrogate Recovery: 106% 101% 101% 101% 101% 101% LControl Limits: 70-130% 70-130 % 70-130% 70-130 % 70-130 % 70-130% MS/MSD Batch#: VG-3108 VB-3108 VB-3108 VS-3108 VB-3108 VB-3108 MS%Recovery: 67.5% 125% 74.9% 68.1% 72.7% 70.3% Surrogate Recovery: 78.7% 78.6% 78.6% 78.6% 78.6% 78.6% L MSD %Recovery: 87.9% 105% 77.8% 69.6% 72.5% 69.4% Surrogate Recovery: 79.1% 82.3% 82.3% 82.3% 82.3% 82.3% Relative %Difference: 24.3% 17.1% 3.63% 1.82% 0.329% 1.22% Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 99.9% 102% 102% 102% 102% 102% 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. ANALYST: APPROVED BY: 1 C/ J. one is Phi/lips Lfivironmental Lab Director L