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CASTLE ANALYTICAL LABORATORY <br /> Y 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 Flag City Chevron Method TPN-Diesel <br /> of Northern California Reference Number 2090 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 3-8-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 3-8-99 <br /> Attn Tim Cuellar Reported 3-10-99 <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> Units ug1L <br /> LCS Batch # TPHDW-3089 <br /> LCSA % Recovery 117% <br /> LCSB % Recovery 116% <br /> Control Limits 55-130 % <br /> Relative % Difference 0583% <br /> MS/MSD Batch # TPHDW-3089 <br /> MS % Recovery See Note <br /> IMSD % Recovery See Note <br /> Relative % Difference See Note <br /> E <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 QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> air J Cone Darn IC Phillips <br /> Pll�lrronmen Lab Director <br />