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' CASTLE ANALYTICAL LABORATORY <br /> • Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone: (209)384-2930 <br />' Fax: (209)384-1507 <br /> Certificate No.2480 <br /> Advanced GeoEnvironmental, Inc. Client Project ID:Grewals Market Method:TPH-Diesel <br /> Instrument ID: HP GC1 <br /> ' of Northern California Reference Number:6597 Extracted: 02-05-04 <br /> 837 Shaw Road Matrix:Water <br /> Stockton, CA 95215 Analyst: Jim Phillips Analyzed: 02-10-04 <br /> Attn:Tim Cuellar <br /> Reported:02-12-04 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration: 180 <br /> ' Units: uglL <br /> Batch#: TPHDW-2204 <br /> ' Method Blank: ND <br /> LCSA%Recovery: 90.5% <br /> �. LCSB%Recovery: 67.6% <br /> Control Limits: 55-130 <br /> Relative%Difference: 28.9% <br /> MSIMSD Batch#: TPHDW-2204 <br /> ' MS%Recovery: See Note <br /> MSD%Recovery: See Note <br /> ' Relative%Difference: See Note <br /> ' Note: Insufficient sample material to prepare MSIMSD 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 /> jnll� <br /> ��LXV' ANALYST: APPROVED BY: <br /> Clari J. Cone qLabtory <br /> Phillips <br /> Director <br /> 1 <br />