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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone: (209)384-2930 <br /> Certificate No. 2079 Fax: (209)384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID:Grewal's Market Method:TPH-Diesel <br /> of Northern California Reference Number: 3539 instrument ID: HP-GC1 <br /> 837 Shaw Road Matrix:Water Prepared: 2-20-01 <br /> Stockton,CA 95215 Analyst:Jim Phillips Analyzed: 2-25-01 <br /> Attn:Tim Cuellar Reported: 2-27-01 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration: 250 <br /> Units_ ug/L <br />' LCS Batch#: TPHDW-2201 <br />' LCSA% Recovery: 91.1% <br /> LCSB%Recovery: 93.8% <br /> Control Limits: 55-130 <br /> Relative% Difference: 2.87% <br />' MSIMSD Batch#: TPHDW-2201 <br /> MS%Recovery: See Note <br /> MSD %Recovery: See Note <br /> Relative%Difference: See Note <br /> 1 <br />' Note: Insufficient sample material to prepare MS/MSD samples. LCS samples prepared in duplicate. <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 /> Clan J. Cone Jar`rre c- Phillips <br /> `fLaboratory Director <br />