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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: 12091 3$4-2930 <br /> Fax: (209) 364-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: Grewal's Market Method: EPA 503018015M,8020 <br /> of Northern California Reference Number: 1116 Instrument ID: Var-GC1 <br /> 1803 West March Lane, Suite A Matrix: Soil Prepared: 5-13-97 <br /> Stockton, CA 95207 Analyst: Clari Cone Analyzed: 5-14-97 <br /> Attn: Tim Cuellar Reported: 5-15-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Xylenes <br /> Spike Concentration: 2.00 20.0 20.0 20.0 20.0 40.0 <br /> Units: mg/kg ug/kg uglkg ug/kg ug/kg ug/kg <br /> LCS Batch #: VG-5137 VB-5137 VB-5137 VB-5137 VB-5137 VB-5137 <br /> LCS % Recovery: 96.3% 93.4% 98.4% 98.9%. 94.5% 98.7% <br /> Surrogate Recovery: 100% 125% 125% 125% 125% 125% <br /> Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch #: VG-5137 VB-5137 VB-5137 VB-5137 VB-5137 VB-5137 <br /> Recovery: <br /> MS /° <br /> ° 97.3% 85.5% 79.6% 75.3% 80,1% 80.5% <br /> 0 0 ° <br /> Surrogate Recovery: 122% 79.9% 79.9% 79.9% 79.9/° 79.9/o <br /> MSD % Recovery: 109% 82.9% 78.6% 74.8% 78.9% 79.7% <br /> Surrogate Recovery: 122% 95.5% 95.5% 95.5% 95.5% 95.5% <br /> Relative % Difference: 10.8% 3.09% 1.26% 0.562% 1.51% 1.06% <br /> Methanol Blank : ND ND ND ND ND ND <br /> Surrogate Recovery: 126% 125% 125% 125% 125% 125% <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 QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> � r <br /> ANALYST: APPROVED BY: 4. <br /> Clari J. Conemes C. Phi Irps <br /> Environmental Lab Director <br /> k <br /> i <br />