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1 <br /> I <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmentai Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate No 2079 Fax (209)384-1507 <br /> Advanced GeoEnvironmentai Inc Client Project ID Cal Fuels Method TPH-Diesel <br /> of Northern California Reference Number 3216 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 9-18-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 9-20-00 <br /> Attn Tim Cuellar Reported 9-21-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br /> LCS Batch# TPH❑W-9180 <br /> LCSA% Recovery 764% <br /> LCSB% Recovery 863% <br /> Control Limits 55-130% <br /> Relative% Difference 121% <br /> MS/MSD Batch# TPHDW-9180 <br /> MS%Recovery See Note <br /> MSD % Recovery See Note <br /> Relative% Difference See Note <br /> I <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 mterterent free matrix that is fortified wi#h 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 MSlMSD's are advisory only and are not used to accept or <br /> reject match results <br /> ANALYST �✓ APPROVED Bq,,,,onCm,,t,1 <br /> Clan J Cone hi!lfps <br /> Lab D�recfor <br />