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HOUSTON LABORATORY <br /> 8680 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> W.00. {713}M-0901 <br /> Quality Control Report <br /> EXXON Company U.S A <br /> 1606 S EI Dorado St Stockton,CA <br /> Analysis Purgeable Aromatics WorkOrder 00080031 <br /> Method SW8021B Lab Batch ID R18413 <br /> Method Blank Samples in Analytical Batch <br /> RunID HP_U OOOS03B-359193 Units ug/L Lab Sample ID Client Sample ID <br /> Analysis Date 08/0312000 1128 Analyst DL 00080031-01A MW-1 <br /> 00080031402A MW-2 <br /> ODOBW31-03A MW-3 <br /> Analyte Result Rep Limit 00080031-04A MW-4 <br /> Benzene ND 050 00080031-M MW-5 <br /> Ethylbenzeno ND 050 00080031-06A MW-6 <br /> Methyt tort-butyl ether ND 050 00080031-07A MW-7 <br /> Toluene ND 050 00080031-08A VEW-2 <br /> m X lene ND 0 50 <br /> o-X lene ND 050 <br /> Xylenesjotal ND 050 <br /> Surr 1 4-Difluorobenzene 993' 72-137 <br /> Surr•4-Bromofluorobenzene 102 448-156 <br /> Laboratory Control Sample(LCS) <br /> RunID HP_U 000803B-359189 Units ug/L <br /> Analysis Date 08/03/200010 39 Analyst DL <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Benzene 50 50 100 70 130 <br /> Elhylbenzene 50 52 103 70 130 <br /> Methyl tert-butyl ether 50 45 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 /> Xylenesjotal 150 151 101 70 130 <br /> Matrix Spike(MS)!Matrix Spike Duplicate IMSDI <br /> Sample Spiked 00080031-01 • <br /> RunID HP U-0008038-359196 Units ug/L <br /> Analysis Date 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 Limn Limit Limit <br /> Added Added <br /> Benzene ND 20 20 102 20 20 990 271 21 32 164 <br /> Ethylbenzene ND 20 21 105 20 21 103 210 19 52 142 ' <br /> Methyi tert-butyl ether 0 59 201 1$ 89 p 201 181 89 i 0 175 201 39 150 <br /> Qualifiers ND/U-Not detected at the Reporting Limit '-Recovery Outside Advisable QC Limits <br /> i <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 /> 00080031 Page 11 <br /> 8716!00 4 0411 PM <br />