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I <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209) 364 2930 <br /> Certificate No 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 2173 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 4-14-99 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 4-15-99 <br /> Attn Tim Cuellar Reported 4-16-99 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br /> iLCS Batch # TPHDW 4149 <br /> LCSA % Recovery 81 5% <br /> LCSB % Recovery 748% <br /> Control Limits 55-130 % <br /> Relative % Difference 8 56% <br /> IMS/MSD Batch # TPHDW 4149 <br /> MS % Recovery See Note <br />' MSD % Recovery See Note <br /> Relative % Difference See Note <br /> I <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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> refect batch results <br /> ANALYST ''+�u� APPROVED B;nvironmenral <br /> Clary J Cone C Phillips <br /> Lab Director <br /> I <br />