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' HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> (713)660-0901 <br /> Quality Control Report <br /> ' EXXON Company U S A <br /> 000417-A1 <br /> Analysis Gasoline Range Organics WorkOrder 00040550 <br /> t Method CA—GRO Lab Batch ID R12962 <br /> Method Blank Samples in Analytical Batch <br /> RunlD HP_W_0004260-259890 Units mg/L Lab Sample 1D Client Sample ID <br /> ' Analysis Date 04/26/2000 12 17 Analyst DL 00040550-04A MW-4 <br /> 00040550-05A MW-5 <br /> 00040550-06A MW-6 <br /> ' <br /> Analyte Result Rep Limit 00040550-07A MW-7 <br /> 00040550-08A VEW-2 <br /> Gasoline Ran e Organics NO 00501 9---g 00040550-09A TB <br /> Surr 1 4 Difluorobenzene 1041 62-144 <br /> _ Surr 4 Bromofluorobenzene 934 44 153 <br /> ' Laboratory Control Sample(LCS <br /> RurdD HP W_000426D 259889 Units mg/L <br /> ' Analysis Date 04/26/2000 11 01 Analyst DL <br /> Analyte Spike Result Percent I Lower Q <br /> F Added Recovery I--Limit Gasoline Range Organics 1 092 92 64� <br /> M (MSD) <br /> Matrix Spike(MS)!Matrix Spike Du p ( ) <br /> ' Sample Spiked 00040550-07 <br /> RunlD HP_W_000426D-260280 Units mg1L <br /> Analysis Date 04126/2000 21 05 Analyst DL <br /> Analyte I Sample MS MS Result MS% MSD MSD Result MSD% RPD RPD Low High 'I <br /> P <br /> Result Spike Recovery Spike Recovery Limit Limit Lima <br /> -- -- — Added Added — -- I <br /> Gasoline Range Organics i NDJ 0 9 0 82 91 21_ 0 91 089, 98 5 7 72 36- 160 <br /> I , <br /> Qualifiers NDIU-Not Detected at the Reporting limit "-Recovery Outside Advisable QC Limits <br /> ' B-Analyte detected in the associated Method Blank D-Recovery Unreportable due to nilubon <br /> J-Estimated value between MDL and PQL 00040550 Page 14 <br /> 4!28100 10 0 3 08 A M <br />