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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone 1209) 384-2930 <br /> Certificate No 2079 Fax (209) 384-1507 <br />' Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method TPH-Diesel <br /> of Northern California Reference Number 1822 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 10 30-98 <br />' Stockton, CA 95205 Analyst Jim Phillips Analyzed 10 30-98 <br /> Ann Tim Cuellar Reported 11-3-98 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br />' Spike Concentration 250 <br /> Units ug/L <br /> LCS Batch # TPHDW-0308 <br /> LCSA % Recovery 946% <br />'. LCSB % Recovery 81 9% <br /> Control Limits 55-130 % <br /> Relative % Difference 144% <br /> MS/MSD Batch # TPHDW-0308 <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 /> I 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 /> s <br /> ANALYST APPROVED Binvironmeental <br /> 'zi <br /> Clary J Cone I Ips l <br /> Lab Director <br />