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' CASTLE ANALYTICAL LABORATORY <br /> f 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 Ghent Project ID Top Filling Method TPH-Diesel <br />' of Northern California Reference Number 1929 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 12-28 98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 12-28-98 <br /> Attn Tim Cuellar Reported 1 5-99 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br />' Units uglL <br /> LCS Batch # TPHDW-D288 <br /> LCSA % Recovery 874% <br /> LCSB % Recovery 103% <br /> Control Limits 55-130 % <br /> Relative % Difference 160% <br /> MS/MSD Batch # TPHDW-D288 <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 /> 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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> I <br /> ANALYST ;;t'07 APPROVED B$Jaa <br /> Clary J Cone 11hps <br /> nmenra/Lab Director <br />