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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 /> UP3942 I <br /> Lalysis Purgeable Aromatics WorkOrder 01120303 <br /> Method SW8021B Lab Batch 10 849831 <br /> Matrix Spike(MSL!_Matrix Spike Duplicate(MSD) <br /> Sample Spiked 01120496-03 <br /> Run)D VARE_011214D 951587 Units ug/L <br /> Anaiysis Date 12/14/2001 18 44 Analvst DL <br /> Analyte Sample MS MS Result MS % I MSD MSD Result I MSD % 1 RPD I RPD I Low High <br /> Result Spike Recovery Spike Recovery Limit I Limit Limit <br /> ' Added Added! <br /> p-Xylene <br /> NO] 401 351 881 401 381 9411 6 541 171 531 144f <br /> Xylene NDS 201 171 854 20i 181 91 61 7 011 181 531 1431 <br /> Xylenes Total ND 60 521 867 601 56I` 9331 7411 18� 531 144 <br /> qualifiers NDlU-Not Detected at the Reporting Limit MI-Matrix Interference <br /> B-Analyte detected :n the associated Method Blank D-Recovery Unreportabie due to Dilution <br /> J -Estimated value between MDL and PQL '-Recovery Outside Advisable QC Limits <br /> he percent 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 12/19/01 3 48 06 PM <br />