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HOUSTON LABORATORY SNOINTERCHANGE DRIVE HOUSTON.TEXAS 77 054 ® (T1S)680-0901 Quality Control Report ' EXXON Company U S A 0004'17-A1 Analyses Purgeable Aromatics WorkOrder 00040550 'Method SW802111 Lab Batch ID R12907 Method Blank Samples in Analytical Batch RunlD HP_W_000425A-258695 Units uglL Lab Sample ID Client Sample ID 'Analysis Date 04/25/2000 13 01 Analyst DL 00040550-01A MW-1 00040550-02A MW-2 00040550-03A MW-3 Analyte Result Rep Limit Benzene ND 19 Ethylbenzene NO 10 Melhyl teri butyl ether ND 10 ' Toluene ND 10 m p Xylene I ND 10 o Xylene ND 10 X lenes Total ND 10 Surr 1 4 Difluombenzene 163 72 137 Surr 4-13mmoiluorebenzene I 1021 48156 Laboratory Control Sampll"LCS ' RunlD HP_w_000425A 258694 Units uglL Analysis Date 04/25/2000 12 10 Analyst DL Analyte Spike Result Percent Lower Upper I Added Recovery Limit Limit Benzene ' Ethylben — _ - - --50— 51 — _ 103 _- 61 119 Ethylbenzene 50 51 103 70 118 I Methyl teri-butyl ether _ _ 50 51 102 72 128 Toluene 50 52 103 65 1251 m p-Xylene 100 100 103 721 116; ' o Xylene _ _ _ 50 51 _102 721 1171 Xylenes Total _ l 150 151 101 72 117 Matrix Spike(MS)I Matrix Spike Duplicate(MSD} ' Sample Spiked 00040550-01 RunID HA W_000425A 258696 Units ug1L Analysis Date 04/25/2000 14 11 Analyst DL Sample MS M5 Result_ MS% MSD MSD Result MSD% RPD RPD Low High Analyte I I Result Spike Recovery Spike Recovery Limit Limit Limit Added — -- Added — — i8enzene ND �260 19 939 20 201 98 5 4 81 21 32 1641 1Ethylbenzene _ __ NDS 19 964 -A 20---� -� 20 980 1 59 19 52 142 Methyl tert-butyl ether I NDI 20 17 850 20 19 926 858 20 39 150 luene I ND 20 20 97 7 20 20 99 2 1 53 20 38 159 ' Qualifiers NDIU-Not Detected at the Reporling Limit '-Recovery Outside Advisable QC Limlts B-Analyte detected in the associated Method Blank D-Recovery Unreportable due to Dilution J-Estimated value between MDL and PQL 00040550 Page I 1 4126140 1 D 03 07 AM