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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 ID Pacific Pride-El Dorado Method TPH-Diesel <br /> of Northern California Reference Number 2894 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 3-16-00 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 3-22-00 <br /> Attn Tim Cuellar Reported 3-27-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> ' Units ug1L <br /> LCS Batch# TPHDW-3160 <br /> ' LCSA%Recovery 838% <br /> LCSB%Recovery 876% <br /> ,.Control Limits 55-130% <br /> Relative%Difference 442% <br /> i <br /> MS/MSD Balch# TPHDW-3160 � <br /> ' MS%Recovery See Note <br /> MSD%Recovery See Note <br /> ' Relative%Difference See Note <br /> Note 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 QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> ' reject batch results <br /> ANALYST <br /> • 010APPROVED BY 7 L IlAn <br /> ' Clan J Cone Ja es C Phillips <br /> E vironmental Lab Director <br />