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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 /> Linalysis Purgeable Aromatics WorkOrder 01140955 <br /> Method SWB021B Lab Batch ID R48897 <br /> Matrix Spike WS)!Matrix Spike Duplicate(MSD, <br /> Sample Spiked 01110879-03 <br />' RunlD VARp_011201A-931732 Units ug/L <br /> Analysis Date 12/01/2001 13 52 Analyst D_R <br /> Analyte Sample MS MS Result MS% MSD ~MSD Result MSD % RPD RPD TLow rHigh <br /> Result Spike Recovery Spike Recovery --Limit— <br /> imit Limit Limit <br /> — -- Added i — — Added <br /> p-Xylene ND 40, 51 127 4OF 51 127 0 178 17 53 144 <br /> Xylene ND 201 25 127 20 26 12810489, 18 53 143 <br /> Xylenes,Total ND' 60 76 127 601 77, 128 131 18 531 144- <br /> 1 <br /> 1 <br /> ualiFers NDlU -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 /> Th rcent recoveries for QC samples are correct as reported Due to significant figures and <br />�ounding,the reported RPD may differ from the displayed RPD values but is correct as reported 12110/01 9 03 01 AM <br />