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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone 1209) 384-2930 <br /> Certificate No 2079 Fax (209) 384-1507 <br /> E <br /> ed GeoEnvironmental, Inc Client Project ID Nomelhni Construction Method TPM-Diesel <br /> hern California Reference Number 1710 Instrument ID HP-GC1 <br /> orth Wilson Way Matrix Water Prepared 8-20-98 <br /> n, CA 95205 Analyst Jim Phillips Analyzed 8-20-98 <br /> m Cuellar Reported 8-25-98 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br />' LCS Batch# TPHDW-8208 <br /> LCSA % Recovery 887% <br />' LCSB % Recovery 829% <br /> Control Limits 55-130 % <br /> Relative % Difference 575% <br />' MS/MSD Batch # TPHDW-8208 <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 hmrts and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST Y&IZ APPROVED BY <br /> Clair J Cone J is C Phillips <br /> Environmental Lab Director <br />