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1 <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br />' Certificate No 2079 Fax 1209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method TPH-Diesel <br />' of Northern California Reference Number 956 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 12-10-96 <br /> QUALITY CONTROL. DATA REPORT <br /> ANALYTE TPH-Diesel <br />' Spike Concentration 250 <br />' Units uglL <br /> LCS Batch # TPHDW-DO36 <br /> 1 LCSA % Recovery 882% <br /> LCSB % Recovery 846% <br /> Control Limits 55-130 % <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 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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 2 <br /> ANALYST APPROVED BY <br /> Clary J Cone Ja s C Phrlhps <br /> vrronmental Lab Director <br />