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iHOUSTON 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 /> Inalysis Volatile Organics by Method 82606 WorkOrder 01110955 <br /> Method SW8260B Lab Batch 1D R48843 <br /> Matrix Spike MS 1 Matrix S cke Duplicate MSD <br /> Sample Spiked 01110955-09 <br /> i RunlD N_011129B 930460 Units ug/L <br /> Analysis Date 11130/2001 7 45 Analyst JC <br /> Analyte Sample TMS - MS Result MS % MSD MSD Result MSD % RPD RPD Low High <br /> Result Spike Recovery Spike Recovery L;mit Limit Limit <br /> Added Added <br /> nzene _ NO 50 561 112 50 53 106 6 11 66 134 <br /> lorobenzene NO 50 54, 108 50 51 102 6 13 67 115, <br /> "oluene ND 50 52 104 50 501 100' 4� 13 59- 125 <br /> lchloroethene ND 50 53, 106 50 49, 98 01 8€ 14 61 134- <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> ualiflers NOW -Not Detected at the Reporting Limit Ml- 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 12x10;01 9 04 24 AM <br />