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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O 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 Nomellini Conc Method TPH-Diesel <br /> of Northern California Reference Number 952 Instrument ID HP GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 12-3-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 12 4-96 <br /> Attn Tim Cuellar Reported 12-6-96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br /> LCS Batch # TPHDW-0036 <br /> LCSA % Recovery 88 2% <br /> LCSB % Recovery 846% <br /> Control Limits 55-130 % <br /> I <br /> Relative % Difference 420% <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 [X�J <br /> rf J Cane Ja s Phillips <br /> En rronmental Lab Director <br /> I <br />