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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TX 77054 <br /> Quality Control Report (713)660-0901 <br /> EXXON Company U S A <br /> UP3708 1 <br /> Inalysis Volatile Organics by Method 82608 WorkOrder 01110955 <br /> Method SW8260B Lab Batch ID R48878 <br /> Method Blank Samples in Analytical Hatch <br /> LID N_011130A-931308 Units ug/L Lab Sample ID Client Sample ID <br /> analysis Date 11/30/2001 18 50 Analyst JC 01110955-05B MW7 <br /> Analyte r Result Rep Limit <br />' Meths tert bum ether___ - ND 50 <br /> Surr 1 2-Dichloroethane-d4 '940 62-130 <br /> 4- <br /> _Surr srnmof.orobenzene _ 88 0 70-13_0 <br /> Surr Toluene-d-8� 84 p 74-122 <br /> LaboratoEy Control Sample(LCS) <br /> RunlD N_011130A-931307 Units uglL <br /> tAnalysis Date 11/30/2001 17 56 Analyst JC <br />' Analyte I Spike Result Percent l Lower Upper <br /> 1 Added i Recovery , Limit Limit <br /> 1,1-Dichloroethene 50 46 92 61 145 <br /> Benzene 50 50, 100 76 127' <br /> Chlorobenzene 50 47 94. 75 130 <br /> Toluenp 50 46 92 76 125. <br /> Trichloroethene �50 47 94 71 120, <br /> Matrix Spike(MS)-/Matrix Soike Duplicate(MSD1 <br />' Sample Spiked 01110955-01 <br /> RunlD N_01113GA-931310 Units uglL <br /> Analysis Hate 1113012001 19 44 Analyst JC <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 /> 1-Dichloroethene ND 500. 430 86 5001 450 90 0' 51 141 381 172 <br /> Fzene ND 500 490, 98 500 500. 100 21 11 66, 134 <br /> n <br /> lorobenzene T ND, 500 460' 92 500 460 9201 0 13. 67 115 <br /> oluene ND' 500 4501 90 500 460, 92 0 2' 13 59 125 <br /> ichlaroethene ND 500 460' 92 500 460 920 01 14 61 134 <br /> ualiflers — NOW -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 /> Arcent recoveries for QC samples are correct as reported Due to significant figures and <br /> Ic'unding the reported RPD may differ from the displayed RPD values but is correct as reported 1711clo1 9 04 31 AM <br />