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CASTLE ANALYTICAL LABORATORY �- Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone: (209)384-2930 Certificate#2079 Fax: (209)384-1507 Advanced GeoEnvironmental, Inc. Client Project ID:National Freight inc. Method: EPA 503018015M,8020 of Northern California Reference Number: 3178 Instrument ID:Var-GC1 4005 North Wilson Way Matrix:Water Prepared: 8-28-00 Stockton, CA 95205 Analyst: Jim Phillips Analyzed: 8-28-00 Aftn:Tim Cuellar Reported: 9-7-00 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 Units: uglL ug/l- ug/L uglL ug/L ug/L LCS Batch#: VW-8280 VW-8280 VW-8280 VW-8280 VW-8280 VW-8280 LCS % Recovery- 103% 106% 82.9% 82.9% 91.6% 82.3% Surrogate Recovery: 97.2% 865% 86,5% 86.5% 86.5%6 865% Control Limits: 70-130% 70-130%6 70-130% 70-130% 70-130% 70-130% MS/MSD Batch# VW-8280 VW-8280 VW-8280 VW-8280 VW-8280 VW-8280 Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 MS%Recovery95.8% 75.9% 79.0% 89.5% 98.1% 94.4% Surrogate Recovery- 96.4% 97 1% 97.1% 97.1% 97.1% 97.1% MSD% Recovery: 95.0% 80.7% 87.8% 87.5% 93.7% 91.9% Surrogate Recovery: 96.7%6 117% 117% 117% 117% 117% Relative%6 Difference: 0.775% 5.35% 9.59% 2.24% 4.50% 2.69% _ Methanol Blank L ND ND ND ND ND ND Surrogate Recovery: 91.6% 83.8% 83.8% 83.8% 83.8% 83.8% 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: ,�r LL 171-At- APPROVED BY: Tari J. Cone ! Ja s C. hi Pips nvironmenfal Lab Director r