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I' <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: Grewals Market Method:TPH-Diesel <br /> of Northern California Reference Number: 2331 Instrument ID: HP-GC1 <br /> 4005 North Wilson Way Matrix: Water Prepared: 6.30.99 <br /> Stockton, CA 95205 Analyst: Jim Phillips Analyzed: 7-1-99 <br /> Attn: Tim Cuellar Reported: 7-6-99 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE TPH-Diesel <br /> Spike Concentration. 250 <br />' Units: uglL <br />' LCS Batch #: TPHDW-6309 <br /> LCSA % Recovery: 94.6% <br /> PeLCSB % Recovery: 81.6% <br /> ControlLimits- _55 130 /% <br /> o <br /> s <br /> IRelative % Difference: 14.7% <br /> 'MS/MSD Batch #: TPHDW-6309 <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.y,Due to matrix effects_the,QC.limits and,recoyeries for,MS/MSD's are:advisory only and are not used to-accept or.-. <br /> reject batch results. <br /> ANALYST:. . t' / APPROVED BY: - <br />' Clari J. Cone J C. Phillips <br /> nvironmenral Lab Director <br />