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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TEXAS 77054 <br /> b (713) <br /> 660-0901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> lysis Purgeabie Aromatics WorkOrder 99110582 <br /> 10 82 <br /> Method SW8021 B Lab Batch ID R5491 <br /> Matrix Spike MS 1 Matrix Spike Du licate MSD <br /> Sample Spiked 99110582-02 - <br /> ' RunID HP—N— <br /> N_9911298117961 Units uglL <br /> Analysis Date 11/29/1999 13 57 Analyst WR <br /> Analyte Sample MS MS Result MS % I MSD MSD Result MSD % RPL)RPD Low i High <br /> Result Spike Recovery Spike Recovery Limit Limit I Limit <br /> Added Added <br /> (benzene ND, 20 23 113 20 23' 1137 08861 19 52142' <br /> hyl tert-butyl ether 401 20, 52' 59 4 20 541 67 7I 130 20 39' 150 <br /> IT-oollue�ne -- - - --- — ND 201 22� 112 d 22 112 0 349 20 381 159 <br /> -Xylene NDI 40 46 115 401 46� 116' 0 909 17' 53^ 144 <br /> ylene ND 201 23' 114 20 23 113 0 354, 18 53 143 <br /> Xylenes Total ND 60 69 115 60 69 1 i5 0 17 53 143 <br /> rs ND/U-Not Detected at the Reporting Limit '-Recovery Outside Advisable OC Limits <br /> B-Analyte detected In the associated Method Blank D-Recovery Unreportable due to Dilution <br />' J-Estimated value between MDL and POL <br /> 99110582 Page 13 <br /> 12!9199 11 30 57 AM <br />