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alscience <br />Ervironmental <br />AL aborato es, 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 6 of 12 <br />r, 4 <br />U - <br />N/A <br />12-04-1177 <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 />Malrix <br />Instrument <br />Prepared <br />Analyzed <br />Number <br />699-12.983-2,267 <br />Air <br />GCIMS v <br />N/A <br />04/19/12 <br />120419L01 <br />Parameter <br />SPIKE ADDED LCS %REC <br />LCSD %REC <br />%REC CL <br />RPD <br />RPQ CL Qualifiers <br />Benzene <br />0.07987 <br />110 <br />110 <br />60-156 <br />0 <br />0-40 <br />Toluene <br />0.09421 <br />111 <br />109 <br />56-146 <br />2 <br />0-43 <br />Ethylbenzene <br />0.1086 <br />110 <br />110 <br />52-154 <br />1 <br />0-38 <br />Xylenes (total) <br />0.3257 <br />107 <br />106 <br />42-156 <br />1 <br />0-41 <br />Methyl -t -Butyl Ether (MTBE) <br />0.09013 <br />109 <br />109 <br />50-150 <br />0 <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 />