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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P.O. Box 1360, Winton, CA. 95388 Phone: (209) 384-2930 <br />' Certificate #2079 Fax: (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: Flag City Chevron Method: TPH-Diesel <br />' of Northern California Reference Number. 811 Instrument ID: HP-GC1 <br /> 1803 West March Lane, Suite A Matrix: Soil Prepared: 7-22-96 <br /> Stockton, CA 95207 Analyst: Clari Cone Analyzed: 7-22-96 <br /> Attn: Tim Cuellar Reported: 7-24-96 <br />' QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br />' Spike Concentration: 5.00 <br />' Units: mg/kg <br /> LCS Batch #: TPHD-7226 <br />' LCS % Recovery: 96.2% <br /> Control Limits: 60-130 % <br /> MS/MSD Batch #: TPHD-7226 <br /> MS % Recovery: 76.2% <br />' MSD % Recovery: 70.2% <br /> Relative % Difference: 7.67% <br /> 1 <br /> 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 /> 1 ANALYST: � APPROVED BY: <br /> Clary J. Cone J ss . Phillip <br /> Environmental Lab Director <br />