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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone: (209)384-2930 <br /> Certificate No.2480 Fax: (209)384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID:Grewals Market Method:TPH-Diesel <br />' of Northern California Reference Number.4300 Instrument ID: HP-GC1 <br /> 837 Shaw Road Matrix:Water Prepared: 12-20-01 <br /> Stockton,CA 95215 Analyst:Jim Phillips Analyzed: 12-22-01 <br /> Attn:Tim Cuellar Reported: 01-02-02 <br />! <br /> QUALITY CONTROL, DATA REPORT <br /> ANALYTE TPH-Diesel <br />! Spike Concentration: 250 <br />' Units: ugiL <br /> LCS Batch#: TPHDW-D201 <br /> LCSA% Recovery: 64.8% <br /> LCSB% Recovery: 74.0% <br /> Control Limits: 55-130% <br /> Relative%Difference: "` 13.2% <br /> ' MS/MSD Batch#: TPHDW-D201 <br /> MS%Recovery: See Note <br /> MSD%Recovery: See Note <br /> Relative %Difference: See Note <br /> Note: 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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> ANALYST: APPROVED BY: <br /> Clare J. Cone Ja s hi rps <br /> L oratory Director <br />