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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TEXAS 77054 <br />' Q <br /> . Quality Control Report (T13)680 0903 <br />' EXXON Company U S A <br /> uPo137 1 <br /> Analysis Metals by Method 6010B, Dissolved WorkOrder 00120251 <br /> Method SW60108 Lab Batch ID 9200 <br /> Method Blank Samples in Analytical Batch <br /> RunID 7JA_0012133-505651 Units mg/L Lab Sample ID Client Sample ID <br />'Analysis Date 1211312000 18 47 Analyst E_B 00120251-01C MW-1 <br /> Preparation Date 12/13/2000 11 30 Prep By Method 00120251-02C MW-2 <br /> 00120251-03C MW-3 <br /> - <br /> 00120251-04C MW-4 <br /> — —Analyte — — 7' Result Rep Limit, <br /> — --------- 00120251-05C MW-5 <br /> Lead ND, 005 <br /> 00120251-06C MW-6 <br /> 00120251-07C MW-7 <br />' 00120251-08C V EW-2 <br /> Laboratory Control Sample(LCS) <br />' RunID TJA_001213B 505652 Units mg/L <br /> Analysts Date 12/13/2000 18 52 Analyst E-B <br /> Preparation Date 12/13/2000 11 30 Prep By Method <br /> _ Analyte Spike Result Per--cent Lower' Upper <br /> Added Recovery Limit -I Lsmit <br />' Lead - 2; 1 931 961 80. 120 <br /> Matrix Spike MS !Matrix Spike Duplicate MSD <br /> Sample Spiked 00120251-01 <br /> RunID TJA_001213B 505656 Units mg/L <br />' Analysis Date 12/13/2000 19 01 Analyst E_B <br /> Preparation Date 12/13/2000 11 30 Prep By Method <br /> Analyte Sample MS MS Result MS % MSD MSD Result MSD % E RPD I RPD Low High i <br />' Result Spike Recovery Spike Recovery ° Limit i Limit Limit <br /> Added Added <br /> jLead -- —� --- - - NDf 1 —W_ 1 071 1071 1 --- 1 01, 1011 525, 20, 75I 125 <br /> 1 <br /> fieri ND/U -Not Detected at the Reporting Limit MI -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 /> The percent recoveries for QC samples are correct as reported Due to significant figures and 00120251 Page 18 <br /> rounding the reported RPD may differ from the displayed RPD values but is correct as reported 12/21/00 1009 13 AM <br /> 1 <br />