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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (2091 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Krazan & Associates Inc Client Project ID 034-99039 Method TPH-Doesel <br /> 215 W Dakota Avenue Reference Number 2062 Instrument ID HP GC1 <br /> Clovis CA 93612 Matrix Sod Prepared 2-22 99 <br /> Arm Bruce Myers Analyst Clan Cone Analyzed 2-22 99 <br /> Reported 2-26-99 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 50 <br /> Units mg/kg <br /> LCS Batch # TPHD-2229 <br /> LCS % Recovery 894% <br /> Control Limits 60 130 % <br /> MS/MSD Batch # TPHD-2229 <br /> MS % Recovery 56 3% <br /> MSD % Recovery 649% <br /> Relative % Difference 14 1% <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 sampie 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 /> � f <br /> 1 <br /> ANALYST c/� APPROVED BY <br /> Clary J Cone/ Jame C hjIGps <br /> Fn r menral tab Director <br />