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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 Pacific Pride -West Lane Method TPH-Diesel <br /> of Northern California Reference Number 2464 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Soil Prepared 9-14-99 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 9-15-99 <br /> Attn Tim Cuellar Reported 9-15-99 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 60 <br /> IUnits mg/kg <br /> LCS Batch # TPHD 9149 <br /> LCS % Recovery 105% <br /> Control Limits 60-130 % <br /> MS/MSD Batch # TPHD-9149 <br /> MS % Recovery 81 7% <br /> MSD % Recovery 82 4% <br /> Relative % Difference 0807% <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 /> I D <br /> ANALYST APPROVED BY <br /> C)177'i Cone Ja es C Phillips r <br /> Invrronmenta/Lab Director <br />