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I <br /> CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate#2079 Fax (209) 384-1507 <br />' Advanced GeD Environmental, Inc Client Project ID Flag City Chevron Method TPH-Diesel <br /> of Northern California Reference Number 1655 Instrument ID HP-GC1 <br /> 4005 North Wilson We Matrix Soil Prepared 7-2-98 <br /> Stockton, CA 95205 Analyst Clary Cone Analyzed 7-3-98 <br />' Alin Tim Cuellar Reported 7-8-98 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE TPH-Diesel <br /> Spike Concentration 5 0 <br /> IUnits mg/kg <br /> LCS Batch# TPHD-7028 <br />' LCS % Recovery 115% <br /> Control Limits 60-130 % <br /> MS/MSD Batch # TPHD-7028 <br /> MS % Recovery 787% <br /> MSD % Recovery 801% <br /> Relative % Difference 1 59% <br /> I <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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYSTAPPROVED BY <br /> arr J Cone me C Phillips <br /> Environmental Lab Director <br />