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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br />' J HOUSTON TEXAS 77054 <br /> (713)660 0901 <br /> Quality Control Report <br />' EXXON Company U S A <br /> UP3942 <br /> Analysis Purgeable Aromatics WorkOrder 00120503 <br /> Method SW8021B Lab Batch ID R26454 <br /> Method Blank Samples In Analytical Batch <br /> RunlD HP_R_001219A-511322 Units ug/L Lab Sample am le ID Client Sample ID <br /> 1nalysis Date 12/19/2000 10 47 Analyst D_R 00120503-06A RW-2 <br /> -Analyte v T=Result I— a.5-0 <br /> Benzene _NDi _0 50 <br /> Ethyibenzene__ _ _ f ND_ — 0 50 <br /> hyl ten <br /> Mett butyl ether ND _0 50 <br /> ND Y56 <br /> 1h p-X ly ene _NDi _0 501 <br /> c-Xylene T -- -- - - r ND T 050 <br /> IXylenes Total __ _ _ __ ND 0 501 <br />' -Surr 1 4 Difluorobe_nze_ne 1050_72-1371 <br /> Surr 4-BiamoFlUorobenZene Sfi 9, 48-1561 <br /> Laborato Control Sample LC5 <br /> RunID HP_R_001219A-511321 Units uglL <br /> Analysis Date 12/19/2000 9 56 Analyst D_R <br /> - Analyte Spike TResult Percent Lower Upper € <br /> Added Recovery Limit Limit <br />' Benzone �— 54i 54 �108' 70_ 13D� <br /> Ethylbenzene 501 491 97 701 1301 <br /> Methyl tert-butyl ether 501 481 961 701 130' <br /> Toluene <br /> _-� 501 481 —96---70-1 1301 <br /> m p-Xylene _ -_ _1-- 1001 941 94i 701 1301 <br /> o-Xylene -- 501 47l--4-5--701 1301 <br /> Xylenes Total--- -� __ ---- ---- 1501 141, _-941- -�- 701 - 13pD <br /> Matrix Spike(MS)!Matrix Spike Duplicate(MSD) <br /> Sample Spiked 00120263-01 <br /> RunlD HP_R_001219A-511510 Units ug/L <br /> Analysis Date 12119/2000 17 43 Analyst D_R <br /> Analyte Sample MS MS Result MS % MSD MSD Result MSD % RPD ' RPD Low l�rgh <br /> Result Spike Recovery ; Spike Recovery 1 ; Limit Limit Limit <br /> 'Added , Added <br /> Benzene F ND 20, T _ 15, __-75 31 - -201- 18 y' 90 01 T778 -21, 321 164! <br /> cthylbenzene ND 20 12' - 6221 20, - 15, ----75 11 18 8j- 191 52 142, <br /> ethyl tert butyl ether _ - ND - 20' - -W�- 18 v--91 2; 20 --- - 21 -----1031 12 0 20. 39l 150I <br /> iers ND/U--Not Detected at the Reporting Limit MI -Matrix Interference -- <br /> B-Analyfe detected In the associated Method Blank D-Recover Unre ortable due t <br /> Recovery p o Dilution <br /> 3 -Estimated value between MDL and PQL ` Recovery Outside Advisable QC Limits <br /> The percent recoveries for QC samples are correct as reported Due to significant figures and 00920503 Page 30 <br />,rounding, the reported RPD may differ from the displayed RPD values but is correct as reported 1/2101 903 5a AM <br />