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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209) 384-2930 <br /> I Certificate No 2079 <br /> Fax {2091384-1507 <br /> Advanced GeoEnvvonmental Mc Client Project ID Nomellim Method TPN-Diesel <br /> I of Northern California Reference Number 2343 Instrument 1D HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 7-7-99 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 7-8-99 <br /> Attn Tim Cuellar Reported 7-12-99 <br />' QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br /> ISpike Concentration 250 <br />' Units ug/L <br /> LCS Batch # TPHDW-7079 <br />' LCSA % Recovery 988% <br /> LCSB % Recovery 72 8% <br /> Control Limits 55-130 % <br /> Relative % Difference 303% <br /> MS/MSD Batch # TPHDW-7079 <br /> MS % Recovery See Note <br />' MSD % Recovery See Note <br /> Relative % Difference See Note <br /> tNote 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 /> 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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clary J ConeJa es C Phillips <br /> nvuonmental Lab Director <br />