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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#NlA <br /> Analysis: Metals by Method 6010B,Total WorkOrder. 04061001 <br /> Method: SW6010B Lab Batch ID: ' 39145 <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 /> Barium 43.33 100 142.4 99.12 100 134.0 90.70 6.090 20 75 125 <br /> Beryllium ND 100 92.05 92.05 100 90.18 90.18 2.055 20 -75 125 <br /> Chromium 11.59 100 104.0 92.45 100 100.6 88.99 3.383 20 75 125 <br /> obalt 3.024 100 97.17 94.15 100 93.77 90.74 3.568 20 75 125 <br /> Copper 7.659 100 107.5 99.79 100 105.0 97.34 . 2.308 20 75 125 <br /> Molybdenum NO 100 89.95 89.95 100 88.52 . 88.52 1.596 20 75 125 <br /> Nickel 6.105 100 99.09 92.99 . 100 95.94 89.83 3.234 20 75 125 <br /> Silver 7ND 100 95.17 95.17 100 92.46 92.46 2.890 20 75 125 <br /> Vanadium 26.53 100 122.1 95.54 1001116.9 90.41 4.291 20 75 125 <br /> Zinc 31.96 100 124.3 92.37 100 119.8 87.81 3.734 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 QC samples are correct as reported.Due to significant figures and 04061001 Page 39 <br /> rounding,the reported RPD may differ from the displayed RPD values but is correct as reported. 7/9ro4 3:06:55 PM <br />