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CASTLE ANALYTICAL LABORATORY <br /> • Environmental Testing Services P 0 Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Certificate No 2079 <br /> Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method TPN-Diesel <br /> of Northern California Reference Number 975 Instrument ID HP-GC1 <br /> 1803 West March Lane Suite A Matrix Water Prepared 12-31-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 1-2-97 <br /> Attn Tim Cuellar Reported 1-7-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br /> LCS Batch # TPHDW D316 <br /> LCSA % Recovery 809% <br /> Surrogate %Recovery 91 1% <br /> LCSB % Recovery 908% <br />• Surrogate %Recovery 101% <br /> Control Limits 55-130 % <br /> Relative % Difference 11 6% <br /> MS/MSD Batch # See note <br /> MS % Recovery See note <br /> MSD % Recovery See note <br /> Relative % Difference See note <br /> Note Insufficient sample material to prepare MSIMSD 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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br />• ANALYST APPROVED BY <br /> Clare J Conee C Phillips <br /> Environmental Lab Director <br />