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alaoienee <br />nvii onmenta <br />abora#torres, Inc. <br />Cardno ERI <br />601 North McDowell Blvd. <br />Petaluma, CA 94954-2312 <br />Quality Control - LCS/LCS Duplicate <br />Project: ExxonMobil99CAS/022789C <br />Date Received: <br />Work Order No: <br />Preparation: <br />Method: <br />Page 7 of 11 <br />u It% ACC0,7 <br />N/A <br />12-05-1165 <br />N/A <br />EPA TO -15M <br />RPD - Relative Percent Difference . CL - Control Limit <br />7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494. FAX: (714) 894-7501 <br />Date <br />Date <br />LCS/LCSD Batch <br />Quality Control Sample ID <br />Matrix <br />Instrument <br />Prepared <br />Analyzed <br />Number <br />099.12.983-2,320 <br />Air <br />GC1NIS v <br />NIA <br />05116112 <br />12051511-01 <br />Parameter <br />SPIKE <br />LCS <br />LCS <br />LCSD LCSD <br />%REC CL <br />RPD <br />RPD CL Qualifiers <br />ADDED <br />CONC <br />%DREG <br />CONC %REG <br />Benzene <br />0.07987 <br />0.08302 <br />104 <br />0.08345 104 <br />60-156 <br />1 <br />0-40 <br />Toluene <br />0.09421 <br />0.1014 <br />108 <br />0.1025 109 <br />56-146 <br />1 <br />0-43 <br />Ethylbenzene <br />0.1086 <br />0.1080 <br />99 <br />0.1097 101 <br />52-154 <br />2 <br />0-38 <br />Xylenes (total) <br />0.3257 <br />0.2980 <br />91 <br />0.3033 93 <br />42-156 <br />2 <br />0-41 <br />Methyl -t -Butyl Ether (MTBE) <br />0.09013 <br />0.09684 <br />107 <br />0.09612 107 <br />50-150 <br />1 <br />0-35 <br />RPD - Relative Percent Difference . CL - Control Limit <br />7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494. FAX: (714) 894-7501 <br />