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Pit HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> a HOUSTON TX 77054 <br /> Quality Control Report (713)660-0901 <br /> 4i I EXXON Company U S A <br /> UP3T08 1 <br /> Inalysis Purgeable Aromatics WorkOrder 01110955 <br /> Method SW8021 B Lab Batch 10 R48881 <br /> I <br /> I <br /> Matrix Spike MS 1 Matrix Spike Duplicate MSD <br /> Sample Spiked 01111102-01 <br /> RunID VARE 011201A-931355 Units ug/L <br />' Analysis Date 12/01/2001 18 54 Analyst DL <br /> Analyte Sample MS MS ResultT MS % MSD MSD Result MSD% RPD RPD Low THigh <br /> r� Result Spike Recovery Spike Recovery Limit Limit Limit <br /> Added Added <br /> p-Xylene _ ND 40 39 969 401 36 889 861 17 53 144 <br /> Xylene ND 20 19� 951 201 18, 882 751 18 53 143 <br /> Xyienes Total ND 60 58 967 6011 54 900 714 18, 53' 144 <br /> I <br /> i <br /> I <br /> I <br /> Qualifiers ND/U-Not Detected at the Reporting Limit Ml -Matrix Interference <br />' B-Analyte detected in the associated Method Blank D-Recovery Unreportable due to Oilution <br /> J - Estimated value between MDL and PQL '-Recovery Outside Advisable QC Umits <br /> T rcent recoveries for QC samples are correct as reported Due to significant figures and <br />�unding the reported RPD may differ from the displayed RPD vatues but is correct as reported 12/10/01 s c2 26 AM <br />