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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> ® HOUSTON.TX 77054 <br /> Quality Control Report (713)660-0901 <br /> Shell Oil Company <br /> INC#N1A <br /> Analysis: Metals by Method 6010B,Total WorkOrder: 04061001 <br /> ethod: SW6010B Lab Batch ID: 39145A <br /> Method Blank Samples in Analytical Batch: <br /> RunID: TJAL040703B-2300306 Units: mg/Kg Lab Stele ID Client Sample ID <br /> :nalysis Date: 07/03/2004 21:03 Analyst: MW 04061001-05A B2@4.0-4.5' <br /> reparation Date: 07/02/2004 7:01 Prep By: SE Method SW3050B 04061001-07A B2@11.5-12- <br /> 04061001-1 OA <br /> 2@11.5-12'04061001-10A B5@2.0-2.5' <br /> Analyte Result Rep Limit <br /> Cadmium ND 0.5 <br /> Laborato Control Sample LC5 <br /> RunID: TJA 0407038-2300315 Units: mg/Kg <br /> Analysis Date: 07/03/2004 21:07 Analyst: MW <br /> Preparation Date: 07/0212004 7:01 Prep By: SE Method SW3050B <br /> Analyte Spike Result Percent Lower Upper <br /> Added . Recovery Limit Limit <br /> ' Cadmium 244 244.51 100.2 80 121 <br /> Matrix Spike M5 1 Matrix Spike Duplicate MSD <br /> Sample Spiked: 04061043-01 <br /> RunID: TJA 0407038-2300327 Units: mg/Kg <br /> Analysis Date: 07/03/2004 21:15 Analyst: MW <br /> Preparation Date: 07/02/2004 7:01 Prep By: SE Method SW3050B <br /> Analyte Sample MS MS MS% MSD MSD MSD% RPD PP Low High <br /> Result Spike Result Recovery Spike Result Recovery Limit Limit Limit Added Added <br /> Cadmium ND 100 97.45 97.45 i00 98.20 98.20 0.7687 20 75 125 <br /> Qualifiers: NDN-Not Detected at the Reporting Limit MI-Matrix Interference <br /> B-Analyte detected in the associated Method Blank D-Recovery Unreportable due to Dilution <br /> J-Estimated value between MDL and PQL '-Recovery Outside Advisable QC Limits <br /> NIC-Not Calculated-Sample concentration is greater than 4 times the amount of spike added.Control limits do not apply. <br /> The percent recoveries for OC samples are correct as reported.Due to significant figures and 04061001 Page 41 <br /> rounding,the reported RPD may differ from the displayed RPD values but is correct as reported. 719104 3.06:56 PM <br />