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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvuonmental, Inc Client Project ID Cal Fuels Method TPH Diesel <br /> of Northern California Reference Number 975 Instrument ID HP GCI <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 12-27-96 <br /> Stockton, CA 95207 Analyst Clan Cone Analyzed 12-30-96 <br /> Attn Tim Cuellar Reported 1 7-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPN-Diesel <br /> Spike Concentration 50 <br /> Units mg/kg <br /> LCS Batch # TPHD D276 <br /> LCS % Recovery 93 1% <br /> Control Limits 60-130 % <br /> MS/MSD Batch # TPHD-D276 <br /> MS % Recovery 86 2% <br /> MSD % Recovery 76 2% <br /> Relative % Difference 122% <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 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 /> Carr J Cone J es Phillips <br /> Environmental Lab Director <br />