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HOUSTON LABORATORY <br /> 9880 INTERCHANGE DRIVE <br /> HOUSTON,TEXAS 77054 <br /> ® (713]6604901 <br /> Quality Control Report <br /> EXXON Company U S A <br /> 1606 S EI Dorado St Stockton,CA <br /> Analysis Volatile Organics by Method 8260B WorkOrder 00080031 <br /> Method SW8260B Lab Balch ID 11118667 <br /> Method Blank Samples in Analytical Batch <br /> RunID M_t10080M-363834 Units ug/L Lab Sample ID Client Sample ID <br /> Analysis Date 08108/2000 13 04 Analyst NL 00080031-018 MW-1 <br /> 00080031-0213 MW-2 <br /> 00080031-03B MW-3 <br /> Analyte Result Rep Limit 00080031-04B MW-4 <br /> Met lent-b ether Nta 50 00080031-OSB MW-5 <br /> Surr12-DichloroethaneA4 1040 62-119 OD080031-06B MW-6 <br /> Surr 4-Bromo(luoroberasne 1020 78-123 00080031-07B MW-7 <br /> Surr Toluene-d8 880 74-122 00080031-086 VEW-2 <br /> Laboratory Control Sample(LCSI <br /> RunID M 000808A-363833 Units ug/L <br /> Analysis Date 08/08/2000 12 37 Analyst NL <br /> Analyte Spike Result Percent Lower Upper <br /> Added Recovery Limit Limit <br /> 1,1-Dichloroethene 50 59 118 66 134 <br /> Benzene 50 55 110 79 119 <br /> Chlorobenzene 50 43 861 74 110 <br /> Toluene 50 461 921 731 113 <br /> Tnchloroethene 50 521 1041 741 122 <br /> Matrix Spike(MS)!Matrix Spike Duplicate(MSD) <br /> Sample Spiked 00080060-01 <br /> Run]D M_000808A-363838 Units ug/L <br /> Analysis Date 08108/20001437 Analyst NL <br /> Analyte Sample Result MS MS Result MS% MSD MSD Result MSD 96 RPD RPD Low Nigh <br /> Spike Recovery Spike Recovery Limit Limit Laid <br /> Added Added <br /> 1,1-Dichloroethene ND 2500 3300 132 2500 3400 136 3 14 38 172 <br /> Benzene ND 2500 3100 119 2500 3100 119 0 11 66 134 <br /> Chlorobenzene ND 2500 2300 921 25W 2300 92 0 13 67 115 <br /> Toluene 330 2500 2900 1031 2500 2900 103 0 13 59 125 <br /> Trichloroethene ND 2500 2800 1121 2500 2900 116 4 14 61 134 <br /> Qualifiers N DIU-Not Detected at the Reporting Limit `-Recovery Outside Advisable QC Limits <br /> B-Analyte detected in the associated Method Btank D-Recovery Unreportable due to Dilution <br /> J-Estimated value between MDL and PQL MI-Matrix Interference <br /> 00080031 Page 13 <br /> 8/1 8100 4 04 12 PM <br />