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•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: Grewal's Market Method: EPA 5030/8015M,8024 Of Northern California Reference Number:2893 Instrument ID:Var-GC1 4005 North Wilson Way Matrix:Soil Prepared: 2-8-00 Stockton,CA 95205 Analyst: Clari Cone Analyzed: 2-8-00 Attn:Tim Cuellar Reported: 2-16-00 QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 2.20 42.1 30.1 150 36.5 179 Units: mg/kg ug/kg uglkg ug/kg ug/kg ug/kg ' LCS Batch#: VS-2080 VS-2080 VS-2080 VS 2080 VS-2080 VS-2080 LCS %Recovery: 80.0% 92.8% 67.2% 74.8% 80.5% 74.9% Surrogate Recovery: 85.0% 78.0% 78.0% 78.0% 78.0% 78.0% Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% ' MS/MSD Batch#: VS-2080 VS-2080 VS-2080 VS-2080 VS-2080 VS-2080 ' MS% Recovery: 67.6% 64.0% 60.3% 70.3% 72.7% 68.7% Surrogate Recovery: 92.6% 81.9% 81.9% 81.9% 81.9% 81.9% MSD%Recovery: 66.2% 65.7% 60.7% 70.3% 71.8% 68.1% Surrogate Recovery: 87.6% 78.9% 78.9% 78.9% 78.9% 78.9% Relative% Difference: 1.78% 1.14% 0.597% 0.230% 9.13% 0.866% ' Methanol Blank : ND ND ND ND ND NO Surrogate Recovery: 83.4% 72.0% 72.0% 72.0% 72.0% 72.0% Please Note: The LCS (Laboratory Check Sample)is a control sample of known, interferent fres 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 MS/MSD's are advisory only and are not used to accept or reject batch results. ANALYST: APPROVED BY: Q Clari J. Cone mes C. Phillips Environmental Lab Arrector i