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HOUSTON LABORATOPY <br /> 8880 INTERCHANGE 6RIVEVE <br />' HOUSTON TEXAS 77054 <br /> (713)660 0901 <br /> Quality Control Report <br />' EXXON Company U 5 A <br /> UP3942 1 <br /> Analysis Purgeable Aromatics WorkOrder 01030308 <br />,Method SW8021B Lab Batch ID R31566 <br /> Method Blank Samples in Analytical Batch <br /> RunlD VARE_010315A-603887 Units ug1L Lab Sample ID Client Sample ID <br /> Fnalysis Date 03/15/2001 15 08 Analyst D_R 01030308-16A RW-1 <br /> 01030308-17A RW-2 <br /> 01030308-21A IW-1 <br />' Analyte Result Rep Limrtl <br /> 01benzene <br /> I ND o 5o I <br /> ND 0 541 <br /> her Np 0 50 I ND 050N01 0 501 <br /> o-X leve NO0501 <br /> X Ienes Totai ND 0 50 <br />' Surr, 1 4-Dlfluorobenzene 9101 72-137 <br /> Surr 46romofluorobenzene 9961 48-156 <br /> Laborato Control Sample LCS <br /> RunlD VARE 0103i5A-60388& Units ug/L <br /> Analysis Date 03/15/2001 14 20 Analyst D_R <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> Benzene 50 57 115 70 130 <br /> Ethylbenzene 50 59 117 70 130 <br /> Methyl tert-butyl ether 501 47 93 70 130 <br /> Toluene 50 57 1141 70 1301 <br /> m,p-Xylene 100 1201151 70� 130 <br /> o-Xylene 50 591 1181 701 1301 <br /> Xylenes,Total 1,5011791 119 701 130 <br /> Matrix Spike MS /Matrix Spike Duplicate MSD <br />' Sample Spiked 01030309-03 <br /> RunlD VARE_010315A-603888 Units ug/L <br /> Analysis Date 03/15/2001 15 32 Analyst D_R <br /> I <br /> Analyte i Sample MS MS Result MS% MSD ' MSD Result MSD% i RPD RPD Low High <br /> I Result Spike Recovery Spike Recovery ! Limit Limit L=t <br /> Added Added ! <br /> � � I <br /> Benzene NDI 201 201 992 201 20 1021 3 05 211 321 1641 <br /> thylbenzene NDJ 201 211 104 20 21 1051 1521 19 521 142 <br /> ethyl tert-butyl ether ND 201 161 796 201 17 8221 3 151 20 391 1501 <br /> Aifiers NDIU -Not Detected at the Reporting Limit MI-Matrix Interference <br /> I 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 /> The percent recoveries for QC samples are correct as reported Due to significant figures and 01030308 Page 28 <br /> Irounding,the reported RPD may differ from the displayed RPD values but is correct as reported 3121/()11()24 02 Ann <br />