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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 GeoEnvironmental, Inc. Client Project ID: Grewal's Market Method: TPH-Diesel <br /> of Northern California Reference Number: 1116 Instrument ID: HP-GC1 <br /> 1803 West March Lane, Suite A Matrix. Soil Prepared: 5-14-97 <br /> Stockton, CA 95207 Analyst: Clari Cone Analyzed: 5-14-97 <br /> Attn:Tim Cuellar Reported: 5-19-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesef <br /> Spike Concentration: 5.0 <br /> Units: mg/kg <br /> LCS Batch #: TPHD-5147 <br /> LCS % Recovery: 92.2% <br /> Control Limits: 60-130 % <br /> �MS/MSD Batch #: TPHD-5147 <br /> MS % Recovery: 74.5% <br /> MSD % Recovery: 78.7% <br /> Relative % Difference: 5.3% <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 /> reject batch results. <br /> ANALYST: APPROVED BY: 44/ <br /> i J. Cone Ja 71h;Ds <br /> nvironmental Lab Director <br />