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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#NIA <br /> Analysis: Volatile Organics by Method:8260B WorkOrder: .04061001 <br /> Method: SW8260B Lab Batch ID: R114853 <br /> Sample Spiked: 04060961-13 <br /> RunID: M_040627A-2288548 Units: ug/Kg <br /> Analysis Date: 06/27/2004 15:06 Analyst: ME <br /> Analyte Sample MS MS MS% MSD MSD MSD°/6 RPD RPD Low High <br /> Result Spike Result Recovery Spike Result Recovery Limit Limit Limit <br /> Added Added <br /> 1,1-Dichloroethene ND 501 37.0 74.0 50 42.0 84.0 12.7 221 59 172 <br /> Benzene ND 50 37.0 74.0 501 41.0 82.0 10.3 211 66 142 <br /> Chlorobenzene ND 50 35.0 70.0 501 40.0 80.01 13.3 21 60 133 <br /> Toluene ND 50 38.0 76.0 50 42.0 84.0 10.0 21 59 139 <br /> ,Trichloroethene ND 50 36.01 72.0 50 40.0 80.0 10.5 24 60 140 <br /> 1 <br /> ' Qualtfrers: ND/0-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 52 <br /> rounding,the reported RPD may differ from the displayed RPD values but is correct as reported. 7tW04 3:07:04 PM <br />