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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P.O. Box 1360, Winton, CA. 95388 Phone: (209) 384-2930 <br /> Certificate No. 2079 Fax: (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: Flag City Chevron Method: TPH-diesel <br />' of Northern California Reference Number: 862 Instrument ID: HP-GC1 <br /> 1803 West March Lane, Suite A Matrix: Water Prepared: 8-28-96 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 8-29-96 <br /> Attn: Tim Cuellar Reported: 9-4-96 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br />' Spike Concentration: 250 <br />' Units: uglL <br /> LCS Batch #: TPHDW-8286 <br />' LCSA % Recovery: 83.2% <br /> LCSB % Recovery: 82.4% <br /> Control Limits: 55-130 % <br /> Relative % Difference: 0.966% <br /> MS/MSD Batch #: See note <br /> MS % Recovery: See note <br /> MSD % Recovery: See note <br /> Relative % Difference: See note <br /> INote: Insufficient sample material to prepare MS/MSD samples. LCS samples prepared in duplicate. <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 <br /> ANALYST: APPROVED BY. <br /> Gari J. Coe Jan <br /> s C. Phillj;os— <br /> ,91ironmental Lab Director <br />