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1� <br /> . CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone: (209)384-2930 <br /> Certificate No.2079 Fax: (209)384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: Grewal's Market Method:TPH-Diesel <br />' of Northern California Reference Number:3191 Instrument ID: HP-GC1 <br /> 4005 North Wilson Way Matrix:Water Prepared: 9-7-00 <br /> Stockton,CA 95205 Analyst:Jim Phillips Analyzed: 9-7-00 <br /> Attn:Tim Cuellar Reported: 9-13-00 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br /> Spike Concentration: 250 <br />' Units: ug/L <br /> LCS Batch#: TPHDW-9070 <br />' LCSA%Recovery: 76.5% <br /> LCSB% Recovery: 77.4% <br />' Control Limits: 55-130% <br /> Relative%Difference: 1.15% <br />' MS/MSD Batch#: TPHDW-9070 <br /> MS %Recovery: See Note <br /> MSD% Recovery: See Note <br />' Relative%Difference: See Note <br /> Note: 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 forted 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 /> ' � l <br /> ANALYST: APPROVED BY: <br /> Clari J. Cone James-%Phillips <br />' Env menta!Lab Director <br />