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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 1D Nomellini Method TPH Diesel <br />' of Northern California Reference Number 1474 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 3 4 98 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 3-5-98 <br /> Attn Tim Cuellar Reported 3 B-98 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPM-Diesel <br /> Spike Concentration 250 <br />' Units uglL <br /> LCS Batch # TPHDW-3048 <br />' LCSA % Recovery 89 2% <br /> LCSB % Recovery 82 1% <br /> Control Limits 55-130 % <br /> Relative % Difference 8 327% <br />' MS/MSD Batch # TPHDW-3048 <br />' M$ % 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 MS/MSD s are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED B <br /> Clan J Cone J me C &'Ps <br /> Envlronmenral Lab Drrecror <br /> I <br />