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HOUSTON LABORATORY <br /> 6680 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> (718)660-0901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> Analysls Purgeabie Aromatics WorkOrder 00050532 <br /> Method SW8021B Lab Batch ID R14433 <br /> Matrix Spike(MS)1 Matrix Spike Duplicate(MSD <br /> Sample Spiked 00050457-08 <br /> RunlD HP_U 000522$-287701 Units ug/L <br /> Analysis Date 05/22/2000 15 55 Analyst. WR <br /> Analyte Sample MS MS Result MS% MSD MSD Result I MSD% RPD RPD Low High <br /> Result Spike Recovery Spike Recovery Limit Limit Limit <br /> Added Addedl <br /> Methyl tent-butyl ether ND 20 23 115 20 24 119 367 20 39 150j <br /> Toluene ND 20 23 114 — 20; 24 119 4 36; 201 381 159 <br /> m p-Xylene ND 40 45 112 401 47 117 4 74, 17 53 144, <br /> a-Xylene _ ND 20 221 110 201 181 531 1431 <br /> Xylenes,Total ND 60 67+ 112 60' 70 117 4 38 18 53 144 <br /> ualifiers NDIU-Not Detected at the Reporting Limd "-Recovery Outside Advisable QC Limits <br /> B-Analyte detected in the associated Method Blank D-Recovery Unreportable due to Dilution <br /> J-Estimated value between MDL and PQL MI -Matrix Interference <br /> 00050532 Page 16 <br /> 611!00 9 00 50 Ani <br />