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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone: (209)384-2930 <br /> Certificate No. 2079 <br /> Fax: (209)384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID:Grewal's Market Method:TPH-Diesel <br /> of Northern California Reference Number;2814 Instrument 1D: HP-GC1 <br />' 4005 North Wilson Way Matrix:Water Prepared: 2-9-00 <br /> Stockton, CA 95205 Analyst: Jim Phillips Analyzed: 2-9-00 <br /> Attn:Tim Cuellar Reported: 2-16-00 <br /> iQUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration: 250 <br /> Units: uglL <br /> ' LCS Batch#: TPHDW-2090 <br /> LCSA% Recovery: 66.0% <br /> ' LCSB% Recovery: 67.6% <br /> Control Limits: 55-130% <br /> '.Relative% Difr(fMnce: 2.48% <br /> ' IOS/MSD Batch#: TPHDW-2090 <br /> MS % Recovery: See Note <br /> ' INSD % Recovery: See Note <br /> Relative % Difference: See Note <br /> ' IJote: Insufficient sample material to prepare MSIMSD 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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results. <br />' ANALYST: APPROVED BY: +� <br /> . Clar!J. Cone <br /> me <br /> C. Phi11lps <br /> Environmental Lab Director <br />