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HOUSTON LABORATORY <br /> essoTGEDRIVE <br /> HOUSTON,YEW 77 <br /> 054 <br /> ® (713)660-0901 <br /> Quality Control Report <br />' EXXON Company U S A. <br /> Analysis Purgeable Aromatics WorkOrder 99120319 <br /> ethod SW8021B Lab Batch ID R6027 <br /> Matrix Spike(MS)1 Matrix Spike Duplicate(MSDJ <br />' Sample Spiked 99120311-01 <br /> RunlD HF'_N_991211A-128369 Units uglL <br /> Analysis Date 12/11/1999 20 45 Analyst WR <br /> Analyte Sample MS MS Result MS% MSD MSD Result MS^% RPO RPD Low High <br /> Result Spike Recovery Spike Recovery Limit Limit Lund <br /> Added Added <br /> m,p-Xylene ND- 40 46 114 40 48 120 5 40 17 53 144 <br /> o-Xylene NDI 20 22 109 20 24 118 7 3i 18 53, 143 <br /> Xylenes Total NDJ 601 68 1131 601 721 120 5 71 i8 53 144 <br /> • <br />' Qualifiers NDIU-Not Detected at the Reporting Limit "-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 99120311 Page 14 <br />' 12/22299 3 66 54 PM <br />