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I HOUSTON LABORATORY <br /> 8TERC34ANGE DRIVE <br /> HOUSTON TEXAS 77054 <br /> ® (713)660 0901 <br />' Quality Control Report <br /> EXXON Company U S A <br /> TMO137 <br /> Inalysis Purgeable Aromatics WorkOrder 01010025 <br /> Method SW8021 B Lab Batch ID 827105 <br /> Method Blank Samples in Analytical Batch <br /> UID HP_N_010103A-522432 Units ug/L Lab Sample ID Client Sample ID <br /> Analysis Date 01/03/2001 10 58 Analyst DL 01010025-01A MW-1 <br /> Analyte Result Rep Limit <br /> Benzene ND 0 50 <br /> 'Eth (benzene NDI 0 50 <br /> Toluene NDI 0 501 <br /> M -X tene NDI 0 50 <br />' o-X lene I NDI 050 <br /> Xylenes Total ND 0501 <br /> Sum 1 4-Difluorabenzene 81 91 72-137 <br /> 5urr 4-Sromofluorobenzene I 10G( 48-156 <br /> LaboratoQ Control Sample LC5 <br /> RunlD HP_N_010103A-522433 Units ug/L <br /> Analysis Date 01/03/2001 11 24 Analyst DL <br />' Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Benzene 50 48 97� 701 130 <br /> Ethylbenzene 501 501 100 70 130 <br />' Toluene 50 501 1001 701 130 <br /> {m p-Xylene 100 1001 1001 70 130 <br /> a Xylene1 50 49 99 70 130 <br />' 'Xylenes Total 150 149 99 701 130 <br /> Matrix Spike MS I Matrix Spike Duplicate MSD <br />' Sample Spiked 01010025-01 <br /> RunID HP_N_010103A-523070 Units ug/L <br />' Analysis Date 01/03/2001 17 32 Analyst DL <br />' Analyte I Sample MS MS ResultMS% MSD MSD Result f MSD% ' RPD RPD Low Hlgh <br /> Result Spike Recovery Spike Recovery Limit Limit Limit <br /> Added I Added <br /> enzene I NDI 201 131 656 201 141 69 4 5 621 211 32 164 <br /> (benzene NDI 201 14� 688 20 141 69210525 19 52� 142 <br /> ene I NDI 201 i5 72 6 20 1471 81 1 121 20 38 159 <br /> i p-Xylene ND4 401 291 725 401 291 71 61 1 12 17 53 144 <br /> lens NDI 20� 15 74 i 201 151 73710 5081 18 53 143 <br /> EujSrs ND/U-Not Detected at the Reporting Limit MI -Matrix Interference <br /> B-Analyte detected in the associated Method Blank D-Recovery Unreportabie due to Dilution <br /> J-Estimated value between MDL and PQL *-Recovery Outside Advisable QC Limits <br />�e percent recoveries for QC samples are correct as reported Due to significant figures and 01010025 Page 5 <br /> rounding, the reported RPD may differ from the displayed RPD values but is correct as reported it9fo1 9 3348 AM <br />