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CASTLE ANALYTICAL LABORATORY ��nvilo�,lmon,il�Tes'l,ng�S,gr,,�,00�s 2333 Shuttle Drive, Atwater, CA 95301 Ph�ne2�09) 384-2930 9) 384-1507 Advanced Geo Environmental, 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: 5-29-97 Stockton, CA 95207 Analyst: Clari Cone Analyzed: 5-29-97 Attn:Tim Cuellar Reported: 5-30-97 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- - mglkg ug/kg ug/kg ug/kg ug/kg ug/kg LCS Batch k: VG-5297 VB-5297 VB-5297 VB-5297 VB-5297 VB-5297 LCS % Recovery: 115% 106% 93.3% 104% 96.4% 105% Surrogate Recovery: 124% 1 1 1% 1 1 1% 11 1% 111% 111% Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % OMS/MSD Batch #: VG-5297 VB-5297 V8-5297 VB-5297 VB-5297 VB-5297 MS % Recovery: 67.9% 82.9% 58.7% 57.6% 63.0% 54.7% Surrogate Recovery: 80.1% 71.8% 71.8% 71.8% 71.8% 71.8% MSD % Recovery: 54.4% 76.6% 55.3% 56.0% 60.3% 52.2% Surrogate Recovery: 72.9% 69.895 69.8% 69.8% 69.8% 69.8% Relative % Difference: 20.7% 7.95% 5.57% 2.29% 4.45% 3.30% Methanol Blank : ND ND ND ND ND ND Surrogate Recovery: 108% 108% 108% 108% 108% 108% 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 analytZal methods employed for the samples. The LCS % recovery is used for validation 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 reject batch results. 7 ANALYST: APPROVED BY: G Clare J. Cone hillips nvironmenral Lab Director Ad