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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 GeoEnvironmental, Inc Client Project ID Three B's Truck Plaza Method TPH-Diesel <br /> of Northern California Reference Number 2167 Instrument ID HP-GC1 <br /> I 4005 North Wilson Way Matrix Sod Prepared 4 5-99 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 4-9-99 <br /> Attn Tim Cuellar Reported 4-14-99 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br />' Spike Concentration 5 0 <br /> Units mg/kg <br /> LCS Batch # TPHD-4059 <br /> LCS % Recovery 869% <br /> Control Limits 60-130 % <br /> MS/MSD Batch # TPHD-4059 <br /> MS % Recovery 805% <br /> MSD % Recovery 90 1% <br /> Relative % Difference 11 0% <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 QC limits and recoveries for MSlMSO's are advisory only and are not used to accept or <br /> refect batch results <br /> 1. <br /> ANALYSTAPPROVED BY <br /> Clan J Cone me C hillrps <br /> Environmental Lab Drrecror <br /> 1 <br /> 1 <br />