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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TEXAS 77054 <br /> ® (713)660.0901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> 000131-S1 <br /> Analysts Purgeable Aromatics WorkOrder 00020060 <br /> ELMethod SW8021B Lab Batch ID R8631 <br /> 41111111 Method Blank Samples in Analytical Batch <br /> RunlD HP_N_000203A-180526 Units ug/L Lab Sample ID Client Sample ID <br /> �nalysis Date 02/03/2000 13 21 Analyst WR 00020060-01A MW-1 <br /> 00020060-02A MW-2 <br /> 00020060-03A MW-3 <br /> Analyte Result Rep Limit 00020060-04A MW-4 <br /> Benzene ND 10 00020060-05A MW-5 <br /> Eth (benzene ND 10 00020060-06A MW-6 <br /> Methyl tert butyl ether ND 10 00020060-07A MW-7 <br /> Toluene ND 10 00020060-08A VEW-2 <br /> M -X lene ND 1 0 <br /> o-X lene ND 1 0 00020060-09A Trip Blank <br /> X lens Total ND 1 0 <br /> Surr 1 4 Difluorabenzene 106 B 72 137 <br /> Surr 4-Bromofluorobenzene 104 6 48-158 <br /> Laboratory Control Sample(LCS) <br /> RunlD HP_N_000203A-180524 Units ug/L <br /> Analysis Date 02/03/2000 12 29 Analyst WR <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Benzene 50 46 92 61 119 <br /> Ethylbenzene 50 46 92 70 118 <br /> Methyl tert-butyl ether 50 52 105 721 128 <br /> Toluene 50 47 94 65 125 <br /> m p-Xylene 100 94 94 72 116 <br /> o-Xylene Sol 471 93 72 117 <br /> Xylenes Total 1501 1411 941 721._. 117 <br /> Matrix Spike(MS)1 Matrix Spike Duplicate(MSD <br /> Sample Spiked 00020060-01 <br /> RunlD HP_N_000203A-180536 Units ug/L <br /> Analysis Date 02/03/2000 13 51 Analyst WR <br /> Analyte Sample MS MS Result MS% MSD MSD Result MSD% RPD RPD Low High <br /> Result Spike Recovery Spike Recovery Limit Limit Limit <br /> Added Added <br /> Benzene ND 20 24 117 20 23 116 1 31 21 32 164 <br /> thylbenzene ND 20 24 117 20 23 116 0 412 19 52 142 <br /> ethyl tent-butyl ether ND 20 27 129 20 29 141 9031 20 39 150 <br /> ea <br /> e ND 20 24 117 20 24 117 0762 20 38 159° mit1 ers 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 00020060 Page 12 <br /> 217100 1 35 43 PM <br />