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•CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone 1209) 384-2930 <br /> Certificate 42079 Fax 1209) 384 1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Pride- EI Dorado Method TPH Diesel <br /> ' of Northern California Reference Number 2678 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Soil Prepared 1221-99 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 12 22130 99 <br /> Attn Tim Cuellar Reported 1-4-00 <br /> I 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 5 0 <br /> ' Units mg/kg <br /> LCS Batch # TPHD-D219 <br /> ' LCS % Recovery 406% <br /> Control Limits 60 130 % <br /> ' MS/MSD Batch # TPHD-D219 <br /> ' MS % Recovery 54 1% <br /> MSD % Recovery 57 8% <br /> Relatwe % Difference 5 98% <br /> ' Please Note <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,51g C rllips <br /> ' -environmental Lab Director <br />