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Ask CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 <br /> Ceftificate#2079 Fax: (209)384-15D7 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: Grewal's Market Method:TPH-Diesel <br /> of Northern California Reference Number:2813 Instrument ID: HP-GC1 <br /> 4005 North Wilson Way Matrix: Soil Prepared: 2-15-00 <br /> Stockton, CA 95205 Analyst: Clari Cone Analyzed: 2-16-00 <br /> Attn: Tim Cuellar Reported: 2-16-00 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration: 5.0 <br /> ' Units: mg/kg <br /> LCS Batch#: TPHD-2150 <br /> ' LCS %Recovery: 93.2% <br /> Control Limits: 60-130% <br /> 'WS/MSD Batch#: TPHD-2150 <br /> MS% Recovery: 40.0% <br /> MSD%Recovery: 34.7% <br /> Relative%Difference: 8.90% <br /> Please Now <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 /> d-L <br /> ANALYST: APPROVED B <br /> ' Clan J. Cone amen C. Phillips <br /> Environmental Lab Director <br />