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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone: (209)384-2930 <br />' <br /> CertificateFax: (209)384-'1507 <br /> No.2480 <br /> Advanced GeoEnvironmental, Inc. Client Project ID:Grewals Market Method:TPH-Diesel —] <br />' of Northern California Reference Number.4521 Instrument ID:HP-GC1 <br /> 837 Shaw Road Matrix.Water Prepared: 03-28-02 <br /> Stockton,CA 95215 Analyst:Jim Phillips Analyzed: 03-30-02 <br /> Attn:Tim Cuellar Reported: 04-03-02 <br />' QUALITY CONTROL DATA REPORT <br /> r <br /> ANALYTE TPH-Diesel <br /> Spike Concentration: 250 <br /> ' Units: uglL <br /> LCS Batch#: TPHDW-3282 <br /> ' LCSA%Recovery: 103% <br /> LCSB%Recovery: 102% <br /> Control Limits: 55-130% <br /> Relative%Difference: 0.889% <br /> ' MS/MSD Batch#: TPHDW-3282 <br /> MS%Recovery: See Note <br /> MSD%Recovery: See Note <br /> Relative%Difference: See Note <br /> Note: insufficient sample material to prepare M&MISD 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 /> y' ANALYST: APPROVED BY: <br /> Cbf J. Cone Ja C. Phillips <br /> - <br /> laboratory Director <br />