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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> d HOUSTON,TX 77054 <br /> Quality Control Report (713)660-0901 <br /> Shell Oil Company <br /> INC#NIA <br /> Analysis: Mercury,Total WorkOrder: 04061001 <br /> ethod: SW7471A Lab Batch ID: 39155 <br /> Method Blank Samples in Analytical Batch: <br /> RunID: HGLC_040703A-2298910 Units: mg/Kg Lab Sample ID Client Sample ID <br /> nalysis Date: 07/03/2004 14:29 Analyst: JAB 04061001-05A B2@4.0-4.5' <br /> reparation Date: 07/02/2004 9:50 Prep By: JAB Method SW7471A 04061001-07A 82@11.5-12' <br /> 04061001-10A B5@2.0-2.5- <br /> Analyte Result IRep Limit <br /> Mercu t3D . 0.03 <br /> Laboratory Control Sample LCS <br /> RunID: 11GLC_040703A-2298911 Units: mg/Kg <br /> Analysis Date: 07/03/2004 14:31 Analyst: JAB <br /> Preparation Date: 07/02/2004 9:50 Prep By: JAB Method SW7471A <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Mercury 8.31 8.446 101.6 62 138 <br /> Matrix Spike MS !Matrix Spike Duplicate MSD <br /> Sample Spiked: 04061001-05 <br /> RunID: HGLC_040703A-2298913 Units: mglKg <br /> Analysis Date: 07/03/2004 14:37 Analyst: JAB <br /> Preparation Date: 07/02/2004 9:50 Prep By: JAB Method SW7471A <br /> Analyte Sample MS MS MS% MSD MSD MSD% RPD RPD Low High <br /> Result Spike Result Recovery. Spike Result Recovery Limit Limit Limit <br /> Added Added <br /> ercury0.04260 0.3 0.3584 105.3 0.3 0.3551 104.2 0.9282 20 75 125 <br /> Quallflers: 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 POL "-Recovery Outside Advisable OC 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 QC samples are correct as reported. Due to significant figures and 04061001 Page 42 <br /> rounding,the reported RPD may differ from the displayed RPD values but is correct as reported. 719104 3.06.57 PM <br />