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I <br /> 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 Nomellini Method TPH-Diesel <br />' of Northern California Reference Number 1121 Instrument ID HP GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 5-22-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 5-22-97 <br /> Attn Tim Cuellar Reported 5-27-97 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH Diesel <br /> 1 <br /> Spike Concentration 250 <br />' Units uglL <br /> LCS Batch # TPHDW-5227 <br /> LCSA % Recovery 728% <br /> LCSB % Recovery 82 5% <br /> Control Limits 65-130 % <br /> Relative % Difference 126% <br /> MS/MSD Batch # See note <br /> MS % Recovery See note <br /> MSD % Recovery See note <br /> Relative % 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 G.1.4 4 <br /> C r J Cone J es Phr lips <br /> zl��� <br /> Environmental Lab Director <br />