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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TEXAS 77054 <br /> ® (713)660-0901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> kallysis Pur eabte Aromatics WorkOrder 99110007 <br /> 9 <br /> Method SW8021EV Lab Batch ID R4273 <br /> Matrix Spike(MS)!Matrix Spike Duplicate(MSD <br /> Sample Spiked 99110007-01 <br /> RunlD HP_F2_991103A-89871 Units uglL <br /> Analysis Date 11103/1999 19 31 Analyst CJ <br /> Analyte Sample MS MS Result MS% MSD MSD Result MSD% RPD RPD Low High <br /> Result Spike Recovery Spike Recovery Limit Limit Limit <br /> Added Added <br /> thylbenzene ND 20 20 101 20 11I 55 0 589- 19 52 142 <br /> ethyl tert-butyl ether ND 20 23 117 20 141 698 50 4' 20 39 150 <br /> Toluene ND 20 20 101 20 11 57 2 555-1 20 38 159 <br /> it p-Xylene ND 40 42 104 40 23 57 8 57 3* 17 53 144 <br /> �Xyleries,To <br /> Xylene ND 20 21 103 20 12 580 56 l* 18 53 143 <br /> tal ND 60 63 105 60 35 58 3 57 1* 17 53 143 <br /> tiers ND/U-Not Detected at the Reporting Limit "-Recovery Outside Advisable QC Limits <br /> B-Analyte detected In the associated Method Blank D-Surrogate Recovery Unreportable due to Dilution <br /> J-Estimated value between MDL and PQL <br /> 99110007 Page 12 <br /> 11/1294 10 57 40 AM <br /> 1 <br />