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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TEXAS 77054 <br /> 0 (7131 660 0901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> lalysis Purgeable Aromatics WorkOrder 99110582 <br /> Method SW8021 B Lab Batch ID R5491 <br /> Method Blank Samples In Analytical Batch <br /> InlD HP_N_9911298-117959 Units ug/L Lab Sample ID Client Sample ID <br /> Analysis Date 1112911999 13 33 Analyst WR 99110582-01A MW-1 <br />' <br /> 99110582-02A MW-4 <br /> 99110582-03A MW-5 <br /> 99110582-04A MW-6 <br /> Analyte Result Rep Limit, 99110582-05A MW-7 <br /> ' Benzene - ---- ---- ND 10 <br /> Eth benzene NO - d 99110582-06A MW-8 <br /> Meth ttttert-butyl ether _ __ _ ND 1 0 99110582-07A MW-9 <br /> 'T luo ene NU _ 1 0 99110582-08A MW-10 <br /> Xpm Xpm ylene 1_0 <br /> 1 0 99110582-09A TB 1114199 <br /> Xylenes Total _ _ _ _ _N_ol -1 0 <br /> _ Surr 1 4 Difluorobenzene 92 3I 72 137 <br /> Surr 4-13romofluorobenzene 92 Or 48-156 <br /> Laboratory Control Sample LCS <br /> ' RunlD HP_N_991129B-117953 Units UglL <br /> Analysis Date 11/29/1999 10 12 Analyst WR <br /> Analyte Spike Result Percent Lower f Upper <br /> Added Recovery Limit Limit <br /> Benzene 50 47 94 61 119 <br /> ' Ethylbenzene 50 48 95 70, 118 <br /> Methyl tert-butyl ether 50 47 95 72, 128 <br /> Toluene 501 47 95 651 125 <br /> ' m,p-Xylene -_- 1001 981 98 721 116 <br /> o-Xylene 501 47 94 72' 117 <br /> Xylenes Total — — - 1501 1 5 97 721 116 <br /> Matrix Spike MS 1 Matrix Spike Duplicate MSD <br /> Sample Spiked 99110582-02 <br /> RunlD HP_N 991129B 117961 Units ug/L <br /> ' Analysis Date 11/29/1999 13 57 Analyst WR <br /> Analyte T Sample MS MS Result MS% MSD MSD Result MSD % RPD RPD Low High <br /> ' Result Spike Recovery Spice Recovery Limit Limit Limit <br /> Added Added <br /> Benzene I NO 20 231 112 20 231 112 0352 21 32 164 <br /> ers NOW-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 <br /> 99110582 Page 12 <br /> 1219199 11 30 56 AM <br />