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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate No 2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Protect ID Three B's Truck Plaza Method TPH-Diesel <br /> of Northern California Reference Number 2622 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 11-30-99 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 11-30-99 <br /> Attn Tim Cuellar Reported 12-2-99 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE TPH-Diesel - <br /> Spike Concentration 250 <br />' Units ug1L <br /> LCS Batch # TPHDW-N309 <br />' LCSA % Recovery 78 2% <br /> LCSB % Recovery 73 6% <br />' OControl Limits 55-130 % <br /> Relative % Difference 608% <br /> MS/MSD Batch # TPHDW-N309 <br />' MS % Recovery See Note <br /> MSD % Recovery See Note <br />' Relative % Difference See Note <br /> 1 <br /> Note Insufficient sample material to prepare IVIS/MSD samples LCS samples prepared in duplicate <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 IVIS/MSD s are advisory only and are not used to accept or <br /> reject batch results <br /> 1' <br /> • ANALYSTJ��UWLAPPROVED <br /> BY(0/00: <br /> Clan J Cone Ja s hrllrps <br /> uonmental Lab Director <br />