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Page 7 of 11 <br />alsC1once <br />l]Vlronmental Quality Control - LCS/LCS Duplicate 4 <br />k <br />aboratories, Inc. <br />f. <br />Cardno ERI Date Received: N/A <br />601 North McDowell Blvd. Work Order No: 12-06-0513 <br />Petaluma, CA 94954-2312 Preparation: N/A <br />Method: EPA TO -15M <br />Project: ExxonMobil99CAS/022789C <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 />098.12-983-2,386 <br />Air <br />oc1M5 v <br />NIA <br />06108112 <br />120608L01 <br />Parameter <br />SPIKE <br />LCS LCS <br />LCSD LCSD <br />%REC CL <br />RPD <br />RPD CL Qualifiers <br />ADDED <br />CONC %REC <br />CONC %REC <br />Benzene <br />0.07987 <br />0.07959 100 <br />0.07959 100 <br />60-156 <br />0 <br />0-40 <br />Toluene <br />0.09421 <br />0.09404 100 <br />0.09456 100 <br />56-146 <br />1 <br />0-43 <br />Ethylbenzene <br />0.1086 <br />0.1071 99 <br />01067 98 <br />52-154 <br />0 <br />0-38 <br />Xylenes (total) <br />0.3257 <br />0.3172 97 <br />0.3147 97 <br />42-156 <br />1 <br />0-41 <br />Methyl -t -Butyl Ether (MTBE) <br />009013 <br />0.09016 100 <br />0.08933 99 <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 />