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I <br /> CASTLE ANALYTICAL LABORATORY <br /> J Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br />' Certificate No 2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Joe's Truck Stop Method TPH Diesel <br />' of Northern California Reference Number 990 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 1-16-97 <br /> Stockton, CA 95207 Analyst Clan Cone Analyzed 1-16-97 <br /> Attn Kevin McKibben Reported 1-17-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br />' Spike Concentration 250 <br />' Lints ug/L <br /> LCS Batch # TPHDW-1167 <br /> LCSA % Recovery 924% <br /> LCSB % Recovery 92 8% <br /> Control Limits 55-130 % <br /> Relative % Difference 0399% <br />' MS/MSD Batch # See note <br />' MS % Recovery See note <br /> MSD % Recovery See note <br />' Relatwe % Difference See note <br />' Note Insufficient sample material to prepare MS/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 MSIMSD's are advisory only and are not used to accept or <br />' reject batch results <br /> ANALYST APPROVED BY <br />' Clair J Conees C Phillips <br /> Environmental Lab Director <br /> 1 <br />