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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 /> talysis Purgeable Aromatics <br /> WorkOrder 99110007 <br /> Method SW8021 B - Lab Batch ID R4273 <br /> Method Blank Samples in Analytical Batch <br /> InID HP_R_991103A-89857 Units ug/L - Lab Sample ID Client Sample ID <br /> clysis Date 11/03/1999 12 31 Analyst CJ 99110007-01A MW-6 <br /> 99110007-02A MW-1 <br /> 99110007-03A MW-3 <br /> 99110007-04A VEW-2 <br /> 1 Analyte Result Rep Limit 99110007-05A MW-4 <br /> Benzene ND 10 <br /> Bili (benzene NO 1 0 99114007-06A MW-2 <br /> Meth I tert-butyl ether NO 1 0 99110007-07A MW-7 <br /> Toluene ND 10 99110007-08A MW-5 <br /> ' m -X lene ND 10 <br /> ND 1 0 99110007-09A Trip Blank <br /> o-X lene <br /> Xylenes Total ND 1 0 <br /> Surr 1 4-Difluorobenzene 95 8 72-137 <br /> Surr 4-13romofluorobenzene 98 4 48-156 <br /> Laboratory Control Sample(LCS <br /> RunlD HP_R_991103A-89920 Units uglL <br /> Analysis Date 11/03/1999 14 58 Analyst CJ <br /> 1:Analyte Spike Result Percent Lower Upper <br /> Added I Recovery I Limit Limit <br /> Benzene 50 49� 98 61 119 <br /> 1Ethylbenzene 50 511 103 701 118 <br /> jMethyl tert-butyl ether 50 501 1011 721 128 <br /> 1Toluene 50 501 1001 651 125 <br /> m,p-Xylene 100 1001 102 72 116 <br /> o-Xylene 50 511 1031 72 117 <br /> Xylenes,Total 150 1511 loll 72 116 <br /> Matrix Spike MS !Matrix Spike Duplicate MSD <br /> Sample Spiked 99110007-01 <br /> RunlD HP-R-991 103A-89871 Units ug/L <br /> Analysis Date 11/03/1999 19 31 Analyst CJ <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 /> nzene ND 20 20 101 20 11 55 9 57 1' 21 32 164 <br /> iers ND/U-Not Detected at the Reportng Limit "-Recovery Outside Advisable QC Limits <br /> B-Analyte detected in the associated Method Blank D-Surrogate Recovery Unreportable due t0 Dilution - <br /> J-Estimated value between MDL and PQL <br /> 99110007 Page 11 <br /> 11/1 2199 10 57 39 AM <br />