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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 Flag City Chevron Method TPH Diesel <br /> of Northern California Reference Number 1850 Instrument ID HP GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 11-13-98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 11 16 98 <br /> Attn Tim Cuellar Reported 11-18-98 <br />' QUALITY CONTROL DATA REPORT <br /> IANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br /> LCS Batch # TPHDW N138 <br /> LCSA % Recovery 91 3% <br /> LCSB % Recovery 83 1% <br /> Control Limits 55-130 % <br /> Relative % Difference 937% <br /> MS/MSD Batch # TPHDW-N138 <br /> MS % Recovery See Note <br /> MSD % Recovery See Note <br /> IRelative % 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 QC limits and recoveries for MSIMSD s are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clam J Cone J� es C Phillips <br /> EnvIronmenral Lab Director <br />