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' HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TEXAS 7'054 <br /> (713)660 0901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> UP3708 1 <br /> Analysis Puigeable Aromatics VVorkQrder 01020792 <br /> Method SW8021B Lab Batch ID R30612 <br />' Method Blank Samples In Analytical Batch <br /> RuniD '4P_R_0103C1A 585000 Units ugIL Lab Sample ID Client Sample ID <br />' Analysis Date 03/01/2001 13 59 Analyst D_R 01020792-01A MW 1 <br /> 01020792-02A MW-4 <br /> 01020792-03A MW-5 <br /> - - 01020792-04A MW-6 <br />' - Analyte --- Result Rep Limit <br /> Benzene ND 050 01020792-05A MW-7 <br /> Ethylbenzene _ _ _ _ ND 050 <br /> 01020792 06A MW 8 <br /> Methyl tert-butyl ether _-__ __ - ND__ 0 50 01020792-07A MW-9 <br />' Toluene - --- _ - -_ — ND �0 50 01020792-08A MW-10 <br /> M p-Xylene_ ND_ 95-0 <br /> Xylene i 0_5_0 01020792-09A VEW 1 <br /> xyenes Total _ -___ ND 050 D1020792-10A VEW-3 <br /> Surr 1 4-Diflucrobenzene 96 1 72-137 <br />' Surr 443rOmofluorobenzene __ 111 9 48-156 <br /> Laboratory Control Sample(L <br /> RunC 10301 584999 Units ug/L <br /> Analysis Date 03,0112001 1308 Analyst D_R <br /> Analyte -- Spike Result Percent Lower Upper <br /> Added Recover, Limit Limit <br /> Benzene 50 49 98 70 130 <br /> Ethylbenzene _ 501 52 103 70 130 <br /> Methyl tel ether 50 54 108 70 130 <br /> Toluene 50 51 102 70 130 <br />' m p-Xylene -- - - - - 100, _ 100 - 102 - - 70 - 130 <br /> lo-Xylene - 50 52 1D4 70 130 <br /> Xylenes Total 150 152 101 70'- 130 <br /> Matrix Spike MS 1 Matrix Spike Duplicate MSD <br />' Sample Spiked 01020792-01 <br /> RunlD HP R 010301A-58500 Units ug/L <br /> Analysis Date 03/01/2001 15 12 Analyst D_R <br /> Analyte Sample MS NIS Result MS % MSD MSD Result MSD % RPD RPD Low High <br /> Result Spike Recovery Spike Recovery Limit Limit Limit <br /> --- Added __---- - Added - - --- - -- <br /> IBenzene ND 20 27 136 20 — 27' - 134 1 56 21 32 164 <br /> Ethylbenzene - - - - N020 -- - 28 139 20�-- 28` 139)0416 19 52 142 <br /> Methyl tert-but !ethel 1200 20 1 100 -610" I 20 1200 -390 ' 44 0 ' 20' 39 150 <br /> hfiers NDIU -Not Detected at the Reporting Limit MI Matrix Interference <br /> ' IS -Analyte detected to the associated Method Blank D- Recovery Unreportable due to Dilution <br /> J - Estimated value between MDL and PQL - -Recovery Outside Aav6ahle QC Limits <br /> The percent recoveries for QC samples are correct as reported Due to significant figures and 01020792 Page 14 <br /> rounding the reported RPE)may differ from the displayed RPD values but is correct as reported 3�19r91 3 03 52 PM <br />