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LABOR <br /> TORY <br /> HOUSTON CHANGE RIVE <br /> 8886 INTERCHANGE DRIVE <br /> I HOUSTON,TEXAS 77054 <br /> x (713)6500901 <br /> . Quality Control Report <br /> EXXON Company U S A <br /> t]P 3942 1 <br /> Analysis Gasoline Range Organics WorkOrder 01060855 <br /> Method CA_GRO Lab Batch ID R37944 <br /> Method Blank Samples In Analytical Batch <br /> RuniD VARD_010627B-721651 Units mg/L <br /> Lab Sample ID Client Sample ID <br />�nalysis Date 06/27/2001 12 05 Analyst DL 01060655-11A RW 1 <br /> 01060855-12A MW 8 <br /> 01060855-16A RW 4 <br /> TAnalyte Result Rep Limit! <br /> Gasoline Ran a Qr amts NDI 0050 <br /> -Suri 1 4-Difluorobenzene 10071 62-1444 <br /> Surr 4-Brom0flucrobenzene 7931 44-153 <br /> Laboratory Control Sample(LCS) <br /> RurtlD VARO_010627B-721650 Units mg/L <br /> Analysis Date 06/27/2001 11 40 Analyst DL <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Gasoline Range Organics 11 0 851 851 701 1301 <br /> Matrix Spike MS I Matrix Spike Duplicate MSD <br />' Sample Spiked 01060772-02 <br /> RunID VARD 010627B-721652 Units mg/L <br /> Analysis Date 06/27/2001 13 21 Analyst DL <br /> Analyte Sample MS MS Result MS % I MSD MSD ResultMSD °/a I RPD RPD Low Ht h <br /> Result Spike Recovery I Spike i Recovery Limit i Limit Limit I <br /> Added I iAdded 1 I <br /> lasofine Range Organics I NIDI 091 0 721 80 5 0 9 0 731 81 010 6601 36 361 160 <br /> 1 <br /> Vers NDIU -Not Detected at the Reporting Limit MI -Matrix Interference <br /> 1 t3 -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 /> The percent recoveries for QC samples are correct as reported Due to significant figures and 01060855 Page 30 <br /> rounding, the reported RPD may differ from the displayed RPE)values but is correct as reported 7117101 2 33 37 PM <br />