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CASTLE ANALYTICAL L i ' ABQRATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 Certificate #2079 Fax: (209) 384-1507 `.;.' Advanced Geo Environmental, Inc. Client Project ID: Grewals Market Method: EPA 5030/8015M,8020 of Northern California Reference Number: 2331 Instrument ID: Var-GC1 4005 North Wilson Way Matrix: Soil Prepared: 6-24-99 ' Stockton, CA 95205 Analyst: Clavi Cone Analyzed: 6-24-99 Attn: Tim Cuellar Reported: 7-6-99 > , QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 2.20 42.1 30.11 150 36.5 179 ' Units: mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg LCS Batch #: VS-6249 VS-6249 VS-6249 VS-6249 VS-6249 VS-6249 LCS % Recovery: 101% 106% 90.7% 98.3% 98.4% 93.2% ,Surrogate Recovery: 94,7% 92.2% 92.2% 92.2% 92.2% 92.2% Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % MS/MSD Batch #: VS-6249 VS-6249 VS-6249 VS-6249 VS-6249 VS-6249 MS % Recovery: 45.5% 67.4% 58.4% 64.8% 63.2% 59.2% Surrogate Recovery: 63.6% 62.1% 62.1% 62.1% 62.1% 62.1% MSD % Recovery: 39.4% 58.2% 57.3% 61.2% 59.7% 55.9% Surrogate Recovery: 60.3% 59.1% 59.1% 59.1% 59.1% 59.1% Relative % Difference: 10.1% 12.6% 1,97% 5.63% 5.67% 5.70% Methanol Blank : ND ND ND ND ND ND ' Surrogate Recovery: 92.9% 93.1%' 9 3.1%n 93.1% 93.1% 93.1% 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 QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or reject.;,batch results._ ANALYST: APPROVED BY: • Clari J. Cone Ja es C. Mips vironmenral Lab Director