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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone; (209)384-2930 <br />' Certificate No. 2480 Fax: (209)384-1507 <br /> Advanced GeoEnvironmental, Inc. Client project ID: Grewall's Market Method:TPH-Diesel <br />' of Northern California Reference Number 6151 instrument ID: HP-GC1 <br /> 837 Shaw Road Matrix:Water Extracted: 10-08-03 <br /> Stockton,CA 95215 Analyst: Jim Phillips Analyzed: 10-10-03 <br /> Attn: Tim Cuellar Reported: 10-14-03 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br /> ' Spike Concentration: 250 <br /> Units: uglL <br /> ' LCS Batch#: TPHDW-0083 <br /> LCSA %Recovery: 66.0% <br /> LCSB% Recovery: 60.4% f�b <br /> i <br /> Control Limits: 55-130% <br /> 10 Relative%Difference: 8.74% <br /> MSIMSD Batch#: TPHDW-0083 <br /> MS % Recovery: See Note <br /> ' MSD% Recovery: See Note <br /> Relative%Difference: See Note <br /> 1 <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 /> Clary J. Cone James hillips <br /> Lratory Director <br /> ' r/ <br />