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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 96301 Phone: (209) 384-2930 <br /> Certificate#2079 Fax: (209)384-1507 <br /> Advanced GeoEnwronmental, Inc. Client Project ID: National Freight Inc. Method:TPH-Diesel <br /> of Northern California Reference Number: 3178 Instrument ID, HP-GC1 <br /> 4005 North Wilson Way Matrix: Soil Prepared: 8-31-00 <br /> Stockton. CA 95205 Analyst:Ciari Cone Analyzed: 9-3-00 <br /> Attn:Tim Cuellar Reported: 9-7-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 5.00 <br /> Units: mglkg <br /> LCS Batch#: TPHDS-8310 <br /> LCS%Recovery: 84.7% <br /> Control Limits. 60-130% <br /> MSIMSD Batch#: TPHDS-8310 <br /> MS %Recovery: 66.0% <br /> MSD% Recovery: 61.7% <br /> Relative%Difference: 6.08% <br /> Y Please Note: <br /> The LCS(Laboratory Check Sample)is a control sample of known,interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples. The LCS%recovery is used for validation <br /> 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 <br /> reject batch results. <br /> ANALYST: (&(P4XL APPROVED BY: <br /> Clari J. Cone Jamea'C. hX Jps <br /> rronmental Lab Director <br />