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HOUSTON LABORATORY <br /> 88801NTERCHANGE DRIVE <br /> HOUSTON TX 77054 <br /> Quality Control Report (713)660-0901 <br /> -1 EXXON Company U S A <br /> U P3708 1 <br /> Inalysis Purgeable Aromatics WorkOrder 01110955 <br /> Method SW80218 Lab Batch ID 848912 <br /> Method Blank Samples in Analytical Batch <br /> 1unID VARD-011202A-931968 Units ug/L Lab Sample 1D Client Sample ID <br /> Analysis Date 12/02/2001 15 37 Analyst D_R 01110955-06A MW8 <br /> 1 01110955-09A VEW 1 <br /> Analyte Result -,Rep Limit <br /> - ----,_ '- '- <br /> Benzene NO 050 <br /> Ethylbenzene NO 050 <br /> Toluene _ _ NO 0 50 <br /> Tj-Xylene - -- --- NO 050 <br />' Xylene_ -- � NO 050 <br /> X <br /> Xylenes Total ND 0.50 <br /> Surr1,4-Difluorobenzene 963 72-130 <br /> Surr 4-8ramofluorabenzene 873, 70-130 <br /> Laboratory Control Sample(LCS) <br /> RunID VARD-011202A-931967 Units ug/L <br />' Analysis Date 12/02/2001 14 46 Analyst D_R <br /> Analyte - 1--- Splke Result Percent Lower Upper <br /> Added I Recovery Limit Limit <br /> Benzene 50, 56 111 70 130 <br /> Ethylbenzene 50 581 116' 701 130 <br />' Toluene 50 57 1131 70' 130 <br /> m p-Xylene 1001 120 115 70 130 <br /> o-Xylene 50 581 115, 701 130 <br />' Xylenes,Total 1501 1781 1191_ 70€ 130, <br />' Matrix Spike(MSL Matrix Spike Duplicate(MSPI <br /> Sample Spiked 01111103-03 <br /> RunID VARD 011202A-931969 Units uglL <br />' Analysis Date 12/0212001 16 02 Analyst D_R <br />' Ana€yte Sample MS I MS Result MS % MSD MSD Result MSD % RPD RPD Low High <br /> Result Spike Recovery Spike Recovery Limit Limit Limit <br /> Added Added <br /> ienzene --- - - ND 20 22 109 22T 22 112 321 21 32 ~164 <br /> tyielne <br /> benzene ND1 20 22 110 20 23 112 1 76, 191 52 142 <br /> NO 20 22 109 201 22 111 1 60 20 38 159 <br /> ualifiers — NDIU-Not Detected at the Reporting Limit MI-Matrix Interference <br /> B-Analyte detected in the associated Method Blank D-Recovery Unreportable due to Dilution <br /> J - Estimated value between MDL and PQL Recovery Outside Advisable QC Limits <br /> Th cent recoveries for QC samples are correct as reported Due to significant figures and <br />�unding the reported RPD may differ from the displayed RPD values but is correct as reported 12/10/01 9 03 39 AM <br />