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' CASTLE ANALYTICAL LABORATORY <br /> 1PEnvironmental 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 2162 Instrument ID HP-GC1 <br /> ' 4005 North Wilson Way Matrix Water Prepared 4-6-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 4-9-99 <br /> Attn Tim Cuellar <br /> Reported 4-13-99 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE TPM-Diesel <br />' Spike Concentration 250 <br />' Units ug1L <br /> LCS Batch # TPHDW-4069 <br />' LCSA % Recovery 728% <br /> LCSB % Recovery 620% <br /> Control Limits 55-130 % <br /> Relative % Difference 160% <br /> MS/MSD Batch # TPHDW-4069 <br /> MS % Recovery See Note <br />' MSD % Recovery See Note <br /> Relative % Difference See Note <br /> rNote 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 /> Clan J Cone J,9.47es C Phillips <br /> nvrronmental Lab Director <br />