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S 1 i 1,11ftCASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone: (209)3842930 ' Certificate#2079 Fax: (209)384-1507 Advanced GeoEnvironmentai,Inc. Client Project ID:Grewal's Market Method: EPA 503018015M,8020 ' of Northern California Reference Number:2814 Instrument ID:Var-GC1 4005 North Wilson Way Matrix:Water Prepared: 2-9-00 Stockton,CA 95205 Analyst: Jim Phillips Analyzed: 2-10-00 Attn:Tim Cuellar Reported: 2-16-00 QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 Units: ug1L ug1L ug1L uglL ug/L uglL LCS Batch#: VW-2090 VW-2090 VW-2090 VW-2090 VW-2090 VW-2090 LCS %Recovery: 94.8% 128% 82.5% 81.1% 88.0% 78.4% Surrogate Recovery: 106% 98.3% 98.311/o 98.3% 98.3% 98.3% ' •Control Limits, 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% I MS/MSD Batch#: VW-2090 VW-2090 VW-2090 VW-2091 VW-2090 VW-2090 Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 NIS %Recovery: 125% 53.8% 59.3% 79.4% 92.6% 85.1% Surrogate Recovery: 110% 101% 101% 101% 101% 101% MSD%Recovery: 89.0% 76.7% 54.0% 75.1% 88.0% 82.0% ::arrogate Recovery 113% 98.8% 98.8% 98.8% 98.8% 98.8% Relative% Difference: 32.7% 35.1% 8.45% 5.40% 4.78% 3.58% ' Methanol Blank: NO NO ND NO NO NO Surrogate Recovery: 102% 95.0% 95.0% 95.0% 95.0% 95.0% ' 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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or reject batch results. 0 ANALYST: APPROVED BY: f1 y Clari J. Cone J#es C. Phillips Environmental Lab Director 1