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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> ICertificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project 1D Pacific Pride-West Lane Method TPH-Diesel <br /> I of Northern California Reference Number 6211 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Sample Description Sod Extracted 10-21-03 <br /> Stockton CA 95205 Analyst Clan Cone Analyzed 10-24-03 <br /> Attn Tim Cuellar Reported 10-30-03 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> ISpike Concentration 500 <br /> Units mg/kg <br /> LCS Batch# TPHDS-0163 <br /> LCS % Recovery 870% <br /> Control Limits 60-130% <br /> lie MS/MSD Batch# TPHDS-0163 — /1(0 f <br /> MS % Recovery 568% <br /> MSD% Recovery 591% <br /> Relative% Difference 373% <br /> I <br /> Please Note <br /> I 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 /> 3 <br /> ANALYST W Vy APPROVED BY <br /> Clan J Cone Jam C hillips <br /> La story Director � <br /> I <br />