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1 <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (2091384-2930 <br /> Certificate #2079 <br /> Fax: (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: Paiges Towing Method: EPA 5030/8015M,8020 <br /> ' of Northern California Reference Number: 2188 Instrument 1D: Var-GC1 <br /> 4005 North Wilson Way Matrix: Soil Prepared: 4-14-99 <br /> Stockton, CA 95205 Analyst: Clari Cone Analyzed: 4-15-99 <br /> Attn: Tim Cuellar Reported: 4-22-99 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ' Spike Concentration: 2.20 42.1 30.1 150 36.5 179 <br /> Units: mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> ' LCS Batch #: VS-4149 VS-4149 VS-4149 VS-4149 VS-4149 VS-4149 <br /> ' LCS % Recovery: 110% 100% 91.4% 96.0% 99.2% 92.8% <br /> Surrogate Recovery: 98.7% 94.9% 94.9% 94.9% 94.9% 94.9% <br /> Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> ' MS/MSD Batch #: VS-4149 VS-4149 VS-4149 VS-4149 VS-4149 VS-4149 <br /> ' MS % Recovery: 77.5% 78.7% 76.4% 84.8% 86.6% 81.50/0 <br /> Surrogate Recovery: 83.7% 81.7% 81.7% 81.7% 81.7% 81.7% <br /> MSD % Recovery: 80.2% 77.8% 76.3% 84.5% 86.3% 81.0% <br /> ' Surrogate Recovery: 85.2% 82.8% 82.8% 82.8% 82.8% 82.8% <br /> Relative % Difference: 3.21% 1.21% 0.0857% 0,273% 0.345% 0.559% <br /> Methanol Blank : ND ND ND ND ND ND <br /> Surrogate Recovery: 111% 110% 110% 110% 110% 110% <br /> 1 <br /> Please Note: <br /> ' The LCS {Laboratory 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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> G <br /> ' ANALYST: APPROVED BY: <br /> Clari J. Cone Ja . P ips <br /> . ,,,,eAvironmental Lab Director <br /> 1 <br /> 1 <br />