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CASTLE ANALYTICAL LABORATORY <br /> Fnvironmenta€Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone: (209)384-2930 <br /> ' Certificate No. 2480 Fax: (209)384-1507 <br /> Advanced GeoEnvi ro n mental, Inc. Client Project ID: Grewals Market Method:TPH-Diesel <br /> ' of Northern California Reference Number:4868 Instrument ID: HP-GC1 <br /> 837 Shaw Road Matrix:Water Prepared: 07-18-02 <br /> Stockton,CA 95215 Analyst:Jim Phillips Analyzed: 07-19-02 <br /> Attn: Tim Cueflar Reported: 07-23-02 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration: 250 <br /> ' Units: ug/L <br /> LCS Batch#: TPHDW-7182 <br /> ' LCSA%Recovery: 80.9% <br /> LCSB%Recovery: 81.4% <br /> Control Limits: 55-330 <br /> Relative%Difference: 0.616% <br /> ' MS/MSD Batch#: TPHDW-7182 <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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> C' ANALYST: APPROVED BY: <br /> Clare J. Cone Ja a h1 rps <br /> boratory Director <br />