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S <br /> HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON,TX 77054 <br /> Quality Control Report (713)660-0901 <br /> ' Shelf Oil Company <br /> INC#N1A <br /> Analysts: Volatile Organics by Method 8260B WorkOrder: 04069001 <br /> Method: SW8260B Lab Batch ID: R114853 <br /> Method Blank <br /> RunID: M_040627A-2288546 Units: ug/Kg <br /> Analysis Date: 06/27/2004 14:12 Analyst: ME <br /> Analyte Result Rep Limit <br /> Methyl Cert-butyl ether ND 5.0 <br /> Methylene chloride ND 5.0 <br /> n-B (benzene ND 5.0 <br /> I' n-Pro (benzene ND 5.0 , <br /> Naphthalene ND 5.0 <br /> seaB (benzene ND 5.0 <br /> Stymne ND 5.0 <br /> tert-Bkg3jbeniene ND 5.0 <br /> Tetrachloroethene ND 5.0 <br /> Toluene ND 5.0 <br /> Trichloroethene ND 5.0 <br /> Trichlorofluoromethane ND 5.0 <br /> Vinyl acetate ND 10 <br /> Vinyl chloride ND 10 <br /> cis-12-Dichloroethene ND 5.0 <br /> cis-1 3-Dichloro ro ne ND 5.0 <br /> m Xylene ND 5.D <br /> ' <br /> o-Xyiene ND 5.0 <br /> trans-12-13ichloroethene ND 5.0 <br /> trans-1 3-Dichlororone ND 5.0 <br /> 1 2-Dichloroethene total ND 5.0 <br /> X lenes Total NO 5.0 <br /> Sun.12-Dichloroethane-d4 82.0 64130 <br /> Surr.4-Bromofluorobenzem 90.0 62-130 <br /> Sum Toluene-d8 90.0 70-140 <br /> Laborato Control Sample(LCS <br /> RunID: M_040627A-2288545 Units: ug/Kg <br /> Analysis Date: 06/27/2004 13:07 Analyst: ME <br /> Analyte Spike Result Percent Lower Upper <br /> ' Added Recovery Limit Limit <br /> 1,1-Dichloroethene 50 46.0 92.0 59 172 <br /> Benzene 50 47.0 94.0 66 142 <br /> Chlorobenzene 50 48.0 96.G1 60 133 <br /> Toluene 50 49.0 98.0 59 139 <br /> Trichloroethene 50 48.0 96.0 60 140 <br /> Matrix Spike(MS)-1 Matrix Spike Duplicate MSD <br /> Qualifiers: ND/U-Not Detected at the Reporting Limit MI-Matrix Interference <br /> 8-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 /> NIC-Not Calculated-Sample concentration is greater than 4 times the amount of spike added.Control limits do not apply. <br /> The percent recoveries for QC samples are correct as reported.Due to significant figures and 04061001 Page 51 <br /> rounding,the reported RPD may differ from the displayed RPD values but is correct as reported. <br /> 719!04 3:07;04 PM <br />