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_ CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 <br /> Certificate x'2079 Fax: (209) 384-1507 <br /> Advanced GeoEnvironmenial, Inc. Client Project ID:Yellow Cab Method: EPA 5030/8015M,8020 <br /> of Northern California Reference Number: 1485 Instrument ID: Var-GC1 <br /> 4005 North Wilson Way Matrix: Water Prepared: 3-11-98 <br /> Stockton, CA 95205 Analyst: Jim Phillips Analyzed: 3.11-98 <br /> Attn:Tim Cuellar Reported: 3.1'8-98 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration: 100 1.00 1.00 1.00 1.00 2.00 <br /> Units: ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch ā€¢: VG-3118W VB-31 i 8\'āœ“ VB-3118W VB-3118W VB-3118W VB-31 18W <br /> LCS % Recovery: 97.9% 94.7°ic 95.6% 93.9% 92.7% 93.1% <br /> Surrogate Recovery: 101% 99.4% 99.4% 99.4% 99.4% 99.4% <br /> Control Limits: 70-130 % 70-130 90 70.130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch #: VG-311 SW VB-311 SW VB-3118W VB-3118W VB-3118vāœ“ VB-311 SW <br /> 1,4S % Recovery: 76.60io 71.49ib 90.1% 87.3% 85.7% 85.9% <br /> Surroga,e Recovery: 99.9% 98.5°c 98.5% 98.5% 96.5% 98.50/10 <br /> _ MSD °ic Recovery: 71.2% 66.49c 91.90,10 88.00/10 87.10/10 87.1% <br /> Surrogate Recovery: 1030/10 98.54-c 98.50/10 98.5% 98.5% 98.5% <br /> Relatve 9-b Difference: 5.44°,o 3.7890 1.97°10 0.699% 1.63°c 1.31°0 <br /> Mtethanol Blank : ND ND ND ND ND ND <br /> Surrogate Recovery: 100% 1 C1 910 101% 101°i10 101% 101 9c <br /> The LCS (Labora,ory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples. The LCS % recovery is used for validation <br /> of sample batch results. Due to matrix effects, the QC limits and recoveries for MS/41SD's are advisory only and are not used to accept or <br /> reject batch results. <br /> ANALYST: APPROVED BY: <br /> Clari J. Cone / es C. Phillips <br /> Environmental Lab Director <br />