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HOUSTON LABORATORY <br /> 8HO @[MK TE FIGS DRIVE <br /> 7054 <br />' HOt7STOH.TEXAS 7705{ <br /> ® (713)660-0961 <br /> Quality Control Report <br />' EXXON Company U S A <br /> Analysis Purgeable Aromatics WorkOrder 991203/11 <br />!Method SW8021B Lab Batch ID R6027 <br /> Method Blank Samples In Analytical Batch <br /> RuntD HP_N_991211A-128371 Units ug/L Lab Sample ID Client Sample ID <br />'Analysis Date 12/11/1999 22 20 Analyst WR 99120311-01A MW-2 <br /> 99120311-02A MW-4 <br /> 99120311-03A MW-5 <br />' <br /> Analyte Result Rep Limit 99120311-04A MW-6 I <br /> Benzene E ND 10 99120311-05A lW-1 <br /> E benzene ND 10 99120311-06A RW-1 <br /> Methyi tert-bu!A ether I ND 10 99120311-07A RW-2 <br /> Toluene I ND 10 99120311-08A UVBMW-1 <br /> M -XXylene I ND 10 <br /> o-X ene I ND 14 99120311-09A UVBMW 2 <br /> X enes Total I ND 10 99120311-10A MW-7 <br /> Surr 1 4-Difluorobenzene 931 72137 99120311-11A TB <br /> Surr 4-Bromofluorobenzene 10071 48-156 <br /> Laboratory Control Sample{LCS) <br />' RunlD HP�N 991211A-128368 Units ug/L <br /> Analysis Date 12/11/1999 19 58 Analyst WR <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Benzene 50 50 99 61 119 <br /> Ethylbenzene 50 52 103 701 118 <br /> Methyl tent-butyl ether 50 46 91 72 128 <br /> Toluene 50 52 104 fi5 125 <br /> m p-Xylene 100 110 108 721_ 116 <br /> o-Xylene 50 51 102 721 117 <br /> Xylenes Total 150 161 107 72 117 <br /> T <br /> Matrix S tke MS /Matrix Spike Duplicate MSO <br /> Sample Spiked 99120311-01 <br /> RunlD HP_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 MSD% RPD RPL] Low High <br />' Result Spike Recovery Spike Recovery Limit Limit Limit <br /> Added Added <br /> Benzene ND 20 23 112 20 24 117 422 21 32 164 <br />' Ethylbenzene ND 20 23 115 20124 118 317 19 52 142 <br /> JWQhyl tent-butyl ether ND 20 20 977 20 21 1031 5011 20 391_ 150 <br /> Vnene ND 20 22 112 20 23 115 2 18 20 381 159 <br />' Qualifiers ND/U-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 13 <br />! 12122/99 3,00 54 PM <br />