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L L CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209) 384-2930 Certificate#2079 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 tip 4005 North Wilson Way Matrix:Water Prepared: 3-11-98 Stockton, CA 95205 Analyst: Jim Phillips Analyzed: 3-11-98 Attn:Tim Cuellar Reported: 3-18-98 L QUALITY CONTROL DATA REPORT t ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 100 1.00 1.00 1.00 1.00 2.00 Units: ug/L ug/L ug/L ug/L ug/L uglL LCS Batch#: VG-3118W VB-3118W VB-3118W VB-3118W VB-3118W VB-3118W LCS % Recovery: 97.9% 94.7% 95.6% 93.9% 92.7% 93.1% Surrogate Recovery: 101% 99.4% 99.4% 99.4% 99.4% 99.4% Control Limits: 70-130 % 70-130 % 70-130 % 70-130% 70-130 % 70-130% LMS/MSD Batch#: VG-3118W VB-3118W VB-3118W VB-3118W VB-3118W VB-3118W MS % Recovery: 76.6% 71.4% 90.1% 87.3% 85.7% 85.9% Surrogate Recovery: 99.9% 98.5% 98.5% 98.5% 98.5% 98.5% MSD % Recovery: 71.2% 66.4% 91.9% 88.0% 87.1% 87.1% Surrogate Recovery: 103% 98.5% 98.5% 98.5% 98.5% 98.5% Relative % Difference: 5.44% 3.78% 1.97% 0.699% 1.63% 1.31% Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 100% 101% 101% 101% 101% 101% 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: C/ari J. Cone as . Phr li s Environmental Lab Director