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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> G HOUSTON,TX 77054 <br /> Quality Control Report (713)660-0901. <br /> Shell Oil Company <br /> INC#NIA <br /> Analysis: Metals by Method 60108,Total WorkOrder: 04061001 <br /> ethod: SW6D10B Lab Batch ID: 39145 <br /> Method Blank Samples in Analytical Batch: <br /> RunID: TJk04O7O2F-2298539 units: mg/Kg Lab Sample ID Client Sample ID <br /> nalysis Date: 07!0212004 21:42 Analyst: MW 04061001-05A B2@4.0-4.5' <br /> reparation Date: 07/02/2004 7:01 Prep By: SE Method SW3050B 04061001-07A 82@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 /> Barium ND 0.5 <br /> Beryllium ND 0.5 <br /> Chromium NO 1 <br /> Cobaft ND 1 <br /> Copper ND 1 <br /> Molybdenum NDJ 2 <br /> Nickel ND 2 <br /> Silver NDJ 1 <br /> Vanadium NDJ 0.5 <br /> Zinc ND 2 <br /> Laboratory Control Sample(LCS <br /> RunID: TJA_040702F-2298540 Units: mg/Kg <br /> Analysis Date: 07/02/2004 21:46 Analyst: MW <br /> Preparation Date: 07/02/2004 7:01 Prep By: SE Method SW3050B <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Barium 140 141.6 101.2 78 122 <br /> Beryllium 67.8 66.17 97.60 81 119 <br /> Chromium 99.2 92.75 93.50 79 121 <br /> Cobalt 43 39.56 92.01 77 122 <br /> Copper 70 68.48 97.83 79 122 <br /> Molybdenum 31.2 30.69 98.38 78 122 <br /> Nickel 82.4 77.26 93.77 77 123 <br /> Silver 126 130.4 103.5 60 140 <br /> Vanadium 107 102.4 95.681 751 125 <br /> Zinc 138 131.6 95.331 76 122 <br /> Matrix Spike(MS)I Matrix Spike Duelicate-(MSD) <br /> Sample Spiked: 04061043-01 <br /> RunID: TJA_040702F-2298542 Units: mg/Kg <br /> Analysis Date: 07/02/2004 21:54 Analyst: MW <br /> Preparation Date: 07/02/2004 7:01 Prep By: SE Method SW3050B <br /> Qualifiers: ND/U-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 /> N1C-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 38 <br /> rounding,the reported RPD may differ from the displayed RPD values but is correct as reported. 719I0w 3:oe:sa PM <br />