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— HOUSTON LABORATORY <br /> 8880 <br /> O T <br /> DRIVE <br /> HOUSTON TEXAS 77054 <br /> x (713)660 0901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> Ralysis Gasoline Organics Range Or <br /> 9 9 1NorkOrder 98110582 <br /> Method CA_GRO Lab Batch ID R5489 <br /> Method Blank Samples in Analytical Batch <br /> InID HP_N_991129A-117930 Units mg/L Lab Sample ID Client Sample ID <br /> Analysis Date 11/29/1999 13 33 Analyst WR 99110582-01A MW-1 <br /> ' 99110582-02A MW-4 <br /> 99110582-03A MW-5 <br /> Analyte _ Result Rep Limit) <br /> 99110582-04A MW-6 <br /> Gasoline Ran9e Organtcs� 99110582-05A MW-7 <br /> _ �___ _ NDI 0050 gg110582 O6A MW-8 <br /> Surr 1 4 Difluorobeniene _ _ 969 _62 144 <br /> _Burr 4 BromofluorobenZene 956i 4 -153 99110582-07A MW-9 <br /> ' 99110582-08A MW-10 <br /> 99110582-09A TB 1114199 <br /> ' Laboratory Control Sample(LCS) <br /> RunID HP_N_991129A 117926 Units mg/L <br /> Analysis Date 11/29/1999 12 38 Analyst WR <br /> Analyte Spike � Result I Percent Lower Upper <br /> Added Recovery Limit- Limit <br /> Gasoline Range Organics 1 0 89 89 64 131 <br /> Matrix Spike MS / Matrix Spike Du licate MSD <br /> ' Sampie Spiked 99110582-03 <br /> RUnID HP N 991129A-117932 Units rnglL <br /> Analysis Date 1112911999 14 45 Analyst WR <br /> Analyte Sample MS MS Result MS % MSD ' MSD Result MSD % RPD rRT <br /> PD Low High <br /> Result Spike Recovery Spike Recovery Limit i Limit Limit <br /> Added Added <br /> saline Range Organics —- NDi 0 91 _1 22 1 26F 0 9' _ 1 21 133' 2 931 36, 36 160 <br /> q&ers ND/U-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 Dilution <br />' 0 - Estimated value between MDL and PQL <br /> 99110582 Page ii <br /> 12A199 11 30 56 AM <br />