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I <br /> HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> Z'W HOUSTON,TEXAS 77054 <br /> (713)660-0901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> 004417-A1 <br /> Analysis Purgeable Aromatics WorkOrder 00040550 <br /> Method SW80218 Lab Batch ID R12963 <br /> Matrix Spike(MS)/Matrix Spike Duplccate_(MSDI <br /> Sample Spiked 00040550-08 <br /> RunlD HP_W_0004268 260307 Units uglL <br /> Analysis Date 04/26/2000 20 14 Analyst DL <br /> ' Analyte Sample MS MS Result MS% MSD MSD Result SD % RPD RPD Low High <br /> Result Spike Recovery Spike Recovery Limit Limit Limit <br /> Added Added <br /> m p-Xylene NO 40 39 98 3 40 39 968 151 17 53 144 <br /> o Xylene I NO 20 19 969 20 19 9571 1291 181 53 14 <br /> Xylenes Total ND 60 581 96 7 60 581 967 01 181 53 144 <br /> i 1 <br /> Qualifiers NDA -Not Detected at the Reporting Lima Recovery Outside Advisable QC Limits <br /> ' B-Analyte detected in the associated Method Blank D-Recovery Unreportable due to Dilution <br /> J Estimated value between MDL and PQL 00040550 Page 16 <br /> ' 4126100 10 03 013 AM <br />