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i <br /> HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> ® HOUSTON,TX 77054 <br /> Quality Control Report (713)660-0901 <br /> Shell Oil Company <br /> INC#N!A <br /> Analysis: Metals by Method 60108,Total WorkOrder: 04061001 <br /> Method: SW6010B Lab Batch ID: 39145-T <br /> Method Blank Samples in Analytical Batch: <br /> RunlD: TJAT_0407038-2299059 Units: mg/Kg Lab Sample ID Client Sample ID <br /> Analysis Date: 07/03/2004 16:22 Analyst: NS 04061001-05A B2@4.0-4.5' <br /> Preparation Date: 0710212004 7:01 Prep By: SE Method SW3050B 04061001-07A B2@11.5-12' <br /> 04061001-10A B5@2.0-2.5- <br /> Analyte Result Rep Limit <br /> Antimony ND 0.5 <br /> Arsenic ND 0.5 <br /> Lead ND 0.5 <br /> Selenium NO 0.5 <br /> Thallium NO, 0.5 <br /> Laboratory Control Sample(LCS <br /> RunID: TJAT-040703B-2299060 Units: mg/Kg <br /> Analysis Date: 07/03/2004 16:28 Analyst: NS <br /> Preparation Date: 07/02/2004 7:01 Prep By: SE Method SW3050B <br /> 1 Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Antimony 79.5 75.68 95.19 0.1 223 <br /> Arsenic 146 151.5 103.8 79 122 <br /> Lead 72.8 71.01 97.55 80. 120 <br /> Selenium 86.51 92.38 106.8 69 131 <br /> Thallium 1181 121.6103.1 76 125 <br /> Matrix Spike(MS)!Matrix Spike Duplicate(MSD) <br /> Sample Spiked: 04061043-01 <br /> RunID: TJAT_0407036-2299062 Units: mg/Kg <br /> Analysis Date: 07/03/2004 16:40 Analyst: NS <br /> Preparation Date: 07102!2004 7:01 Prep By: SE Method SW3050B <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 /> Antimony 5.205 10 14.25 90.46 10 14.21 90.06 0.2811 20 75 125 <br /> Arsenic 2.396 10 11.651 92.54 10 11.86 94.65 1,795 20 75 125 <br /> Lead 10.68 10 18.71 80.35 10 18.76 80.85 0.2669 20 75 125 <br /> Selenium ND 10 9.840 ' 95.76 10 10.19 99.29 3.524 20 75 125 <br /> Thallium 2.142 10 10.72 85.74 10 10.58 84.39 1.268 20 75 125 <br /> Qualifiers: NDlU-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 40 <br /> rounding,the reported RPD may differ from the displayed RPD values but is correct as reported. 719AA 3:08:5s PM <br />