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r) J S 5 i CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 Certificate #2079 Fax: (209) 384-1507 Krazan & Associates, Inc. Client Project ID: 034-990'19 Method: EPA 503018015M,8020 215 W. Dakota Avenue Reference Number: 2062 Instrument ID: Var-GC1 Clovis, CA 93612 Matrix: Soil Prepared: 2-22-99 Attn: Bruce Myers Analyst: Clari Cone Analyzed: 2-22,23-99 Reported: 2-26-99 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: mglkg ug/kg ug/kg ug/kg uglkg ug/kg LCS Batch #: VS-2229 VS-2229 VS-2229 VS-2229 V5-2229 VS-2229 LCS % Recovery: 98.0% 116% 92. °/u 95.1% 97.2% 90.3% Surrogate Recovery: 106% 103% 103% 103% 103% 103% Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % MSIMSD Batch #: VS-2229 VS-2229 VS-2229 VS-2229 VS-2229 VS-2229 MS % Recovery: 92.7% 85.3% 83.1% 86.2% 87.4% 81.2% Surrogate Recovery: 95.5% 92.7% 92.7% 92.7% 92.7% 92.7% MSD % Recovery: 87.3% 95.7% 84.3% 87.0% 88.2% 82.4% Surrogate Recovery: 96.7% 93.8% 93.8% 93.8% 93.8% 93.8% Relative % Difference: 5.94% 11.5% 1.42% 0.919% 0.956% 1.48% Methanol Blank : ND ND ND ND ND ND Surrogate Recovery: 100% 100% 1010% 100% 100% 100% Please Note: The LCS (Laboratory Check Sample) is a control sample of known, inter erent 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: �� ' APPR VED BY: (�f Clari J. Cone / J es . Ph f ips Environmental Lab Director