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CASTLE ANALYTICAL LABORATORY _ Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 Fax: (209) 384-1507 Advanced GeoEnvironmental, Inc. Client Project ID: Yellow Cab Method: EPA 5030/8015M,8020 of Northern 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 ANALYTE Gasoline IJTBE 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 VB-3108 VB-3108 LCS % Recovery: 90.2% 95.3% 95.6% 93.9% 89.2% 91.1% Surroeaie Recovery: 106% 101% 101% 101% 101% 101% Control Limits: 70-130 % 70.130 % 70-130 1110 70-130 % 70-130 % 70-130 % MS/MSD Eatch #: VG-3108 VB-3,108 VB-3108 VB-3108 VB-3108 VB-3108 NIS % 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% h,SD % Recovery: 87.9% 105% 77.8% 69.6% 72.5% 69.4% Surrogate Recovery: 79.1% 82.3% 82.3% 82.3% 62.3% 82.3% Relative 1/1 Difference: 24.3% 17.1 010 3.63% 1.82% 0.329% 1.22% IJlethanol Blank : ND ND ND ND ND ND Surroeaie Recovery: 99.9% 102% 102°/6 102% 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 reacenis, preparation and analytical methods employed for the samples. The LCS % recovery is used for validation of sample batch results. Due to matrix effects, the OC limits and recoveries for MS/MISD's are advisory only and are not used to accept or reject batch results. ANALYST: VEL. "1 APPROVED B5ja- e Phillips ironmenial Lab Director