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LABO <br /> ATORY <br /> HOUSTON CHANGE DRIVE <br /> BBBQ INTERCHANGE DRIVE <br /> HOUSTON,TEXAS T7054 <br /> the ® (713)660-OM <br /> Quality Control Report <br /> EXXON Company U.S.A. <br /> 1505 S E1 Dorado 5t Stockton,CA <br /> Inalysis Purgeable Aromatics WorkOrder 00080031 <br /> Method SW9021B Lab Batch 10 R19413 <br /> Method Blank Samples in Analytical Batch <br /> RunID HP U 0008038-359193 Units ug/L Lab Sample ID Client Sample ID <br /> �nalysis Date 08/03/2000 11 28 Analyst DL 00080031-01A MWA <br /> 00080031-02A MW-2 <br /> 00080031-03A MW-3 <br /> 00080031434A MW-4 <br /> Analyte Result Rep Limit <br /> ' Benzene ND 050 00080031-OSA MW-5 <br /> Eth (benzene ND 050 00080031-06A MW-6 <br /> Methyl fort-butyl ether ND 050 00080031-07A MW-7 <br /> Toluene ND 050 00D80031-08A VEW-2 <br /> M.P-Xviene ND 050 <br /> o-X lane ND 050 <br /> Xytenes,Tolal N0 050 <br /> SurT 1 4-Difluorobenzene 993 72-137 <br /> ' Surr 4-Bromofluorobenzene 1024 48-156 ^� <br /> LaboratoEy Control Sample ILCS1 <br /> ' RunID HP_U_0008038-359189 Units ug/L <br /> Analysis Date 08103120W 10 39 Analyst DJ_ <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Benzene 50 50 100 70 130 <br /> Ethy(benzene 50 52 103 70 130 <br /> Methyl tert-butyl ether 50 451 91 70 130 <br /> Toluene 50 51 101 70 130 <br /> ' m,p-Xylene 100 100 103 70 130 <br /> o-Xylene 50 51 103 70 130 <br /> Xylenes,Total 150 151 101 70 130 <br /> Matrix Spike(MS)!Matrix Spike Duplicate(MSD) <br /> ' Sample Spiked 00080031-01 <br /> RunlD HP U 0008038-359196 Units uglL <br /> Analysis pate 08/03/2000 11 53 Analyst DL <br /> Analyte Sample Result MS MS Result MS% MSD MSD Result MSD% RPD RPD Low High <br /> Spike Recovery Spike Recovery Limit Limit Limit <br /> Added Added <br /> en2ene ND 20 20 102 20 20 99 0 271 21 32 164 <br /> > thylbenzene ND 20 21 105 20 21 103 210 19 52 142 <br /> ethyl tert-butyl ether 059 20 18 39 0 20 18 891 0 175 20 39 150 <br /> li0ers 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 MI-Matrix Interference <br /> 0080031 Page 11 <br /> 8/16100 4 04 11 PM <br />