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CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater,CA 95301 Phone: (209)384-2930 Certificate#2480 Fax: (209)384-1507 BSK Analytical Laboratories Client Project ID:2003030164 Method: EPA 503018015M,8020 1414 Stanislaus Street Reference Number: 5540 Instrument ID:Var-GC1 Fresno,CA 93706 Matrix:Soil Extracted:03-11-03 Attn: Miyuki Fujita Analyst: Clavi Cone Analyzed:03-12-03 Reported:03-20-03 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 2.20 42.0 26.4 159 36.8 184 Units: mg/kg uglkg uglkg uglkg ug/kg uglkg LCS Balch#: VS-3113 VS-3113 VS-3113 VS-3113 VS-3113 VS-3113 LCS %Recovery: 107% 104% 97.3% 84.3% 103% 88.1% Surrogate Recovery: 95.5% 89.8% 89.8% 89.8% 89.8%a 89.8% Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch#: VS-3113 VS-3113 VS-3113 VS-3113 VS-3113 VS-3113 MS% Recovery: 54.6% 61.7% 59.8% 54.4% 59.0% 55.4% Surrogate Recovery: 66.5% 63.1% 63.1% 611% 63.1% 63.1% MSD%Recovery: 63.2% 64.3% 57.2% 56.0% 60.6% 56.5% Surrogate Recovery: 66.5% 62.7% 62.7% 62.7% 62.7% 62.7% Relative%Difference: 13.3% 3.85% 4.42% 2.79% 2.35% 1.90% Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 85.8% 83.8% 83.8% 83.8% 83,8% 83.8% 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 oC limits and recoveries for MS/MSD's are advisory only and are not used to accept or reject batch results. ANALYST: lff7l 9 APPROVED BY: Clary J. Cone James,&Willips- Envi amental Lab Director