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CASTLE ANALYTICAL LABORATORY .Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 Fax: 1209) 384-1507 Advanced GeoEnvironmental, Inc. Client Project ID: Grewal's Market Method: EPA 5030/8015M,8020 of Northern California Reference Number: 1116 Instrument ID: Var-GC1 1803 West March Lane, Suite A Matrix: Soil Prepared: 5-13-97 Stockton, CA 95207 Analyst: Clari Cone Analyzed: 5-14-97 Ann: Tim Cuellar Reported: 5-15-97 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Xylenes Spike Concentration: 2.00 20.0 20.0 20.0 20.0 40.0 Units: mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg LCS Batch #: VG-5137 VB-5137 VB-5137 VB-5137 VB-5137 VB-5137 LCS % Recovery- 96.3% 93.4% 98.4% 98.9% 94.5% 98.7% Surrogate Recovery: 100% 125% 125% 125% 125% 125% Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % �MSIMSD Batch #: VG-5137 VB-5137 VB-5137 VB-5137 VB-5137 VB-5137 MS % Recovery: 97.3% 85.5% 79.6% 75.3% 80.1% 80.5% Surrogate Recovery: 122% 79.9% 79.9% 79.9% 79.9% 79.9% MSD % Recovery: 109% 82.9% 78.6% 74.8% 78.9% 79.7% Surrogate Recovery: 122% 95.5% 95.5% 95.5% 95.5% 95.5% Relative % Difference: 10.8% 3.09% 1.26% 0.562% 1.51% 1.06% Methanol Blank : ND ND ND ND ND ND Surrogate Recovery: 126% 125% 125% 125% 125% 125% Please Note: 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 CC limits and recoveries for MSIMSD's are advisory only and are not used to accept or reject batch results. ANALYST; APPROVED BY: Ciari J. Cone as C. Phi 15s Environmental Lab Director