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i <br /> • CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P d Box 1360, Winton, CA 95388 Phone t209) 384 2930 <br /> Certificate No 2079 Fax f209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID 95-0132 Method TPH-Diesel <br /> of Northern California Reference Number 720 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 4 15 96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 4-15-96 <br /> Attn Tim Cuellar Reported 4-16-96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br /> LCS Batch # TPHDW-41 56 <br /> ILCSA % Recovery 95 6% <br /> LCSB % Recovery 864% <br /> Control Limits 55-130 % <br /> Relative % Difference 101% <br /> MSIMSD Batch # See note <br /> MS % Recovery See note <br /> MSD % Recovery See note <br /> Relative %fl Difference See note <br /> Note Insufficient sample material to prepare MSIMSD samples LCS samples prepared in duplicate <br /> Please Note <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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> I <br /> r <br /> 1 <br /> ANALYST APPROVED BY <br /> Clary J Cone J es U Ph1111ps <br /> Environmental Lab Director <br />