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CASTLE ANALYTICAL LABORATORY <br />{ Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone: 209 384-29 <br /> Certificate No. 2079 Phone: (209) 30 <br /> a Fax: (209)384-1507 <br /> Advanced GeoEnvironmental, inc. <br /> -:: Client P:eN <br /> t ID: Grewal's Market Method:TPH-Diesel <br /> of Northern California Referenumber:3014 Instrument ID:HP-GC1 <br /> 4005 North Wilson Way Matrix: rStockton, CA 95205 Prepared: 5-23-00 <br /> Analyst: Phillips Analyzed: 5 23-Op <br /> Attn:Tim Cuellar <br /> E Reported: 6-1-00 <br /> QUALITY CONTROL DATA REPORT <br /> f <br /> i <br /> ANALYTE TPH-Diesel <br /> i <br /> rSpike Concentration: 250 <br /> Units: ug/L <br /> LCS Batch#: TPHDW-5230 <br /> LCSA%Recovery: 73.9% <br /> ' LCSB% Recovery: 717°7° <br /> Control Limits: 55-130 <br /> Relative%Difference: 3.04% <br /> MS/MSD Batch#: TPHDW-5230 <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 /> 1The 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: PPROVED BY: <br /> Clare J. Cone Jam . Phil rps <br />' E ironmental Lab Director <br />