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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384 2930 <br /> Certificate #2079 Fax (209) 384 1 507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method TPH-Diesel <br />' of Northern California Reference Number 1193 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 7 22-97 <br /> Stockton, CA 95207 Analyst Clari Cone Analyzed 7-24-97 <br /> Attn Tim Cuellar Reported 7-28-97 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br /> I <br /> Spike Concentration 5 0 <br />' Units mg/kg <br /> LCS Batch # TPHD-7227 <br /> ILCS % Recovery 840% <br /> Control Limits 60 130 % <br /> MS/MSD Batch # TPHD-7227 <br />' MS % Recovery 654% <br /> MSD % Recovery 61 4% <br /> Relative % Difference 5 25% <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 MSIMSD's are advisory only and are not used to accept or <br /> re}ect batch results <br /> iANALYST APPROVED BY Q A <br /> Clary J Cone Jam h rps <br /> En ronmental Lab Director <br /> 1 <br /> I <br /> I <br />