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Page 6 of 10 <br />AT.nvironmen#al Quality Control - LCS/LCS Duplicate <br />.r <br />aboratories, Inc. <br />Cardno ERI Date Received: N/A <br />601 North McDowell Blvd. Work Order No: 12-03-1849 <br />Petaluma, CA 94954-2312 Preparation: N/A <br />Method: EPA TO -15M <br />Project: ExxonMobil99CAS/022789C <br />Duality Control Sample I <br />Matrix <br />Instrument <br />Date <br />Prepared <br />Date <br />Anal zed <br />LCS/LCSD Batch <br />Number <br />099-12-953-2,212 <br />Air <br />GCIMS li <br />N/A <br />03/28/12 <br />7283281.01 <br />Parameter <br />SPIKE ADDED LCS %RFC <br />LCSD %REC <br />%REQ CL <br />RPD <br />RPD CL Qualifiers <br />Benzene <br />0.07987 <br />107 <br />105 <br />60-156 <br />2 <br />0-40 <br />Toluene <br />0.09421 <br />107 <br />103 <br />56-146 <br />4 <br />0-43 <br />Ethylbenzene <br />0.1086 <br />108 <br />104 <br />52-154 <br />4 <br />0-38 <br />Xylenes (total) <br />0.3257 <br />106 <br />102 <br />42-156 <br />4 <br />0-41 <br />Methyl -t -Butyl Ether (MTBE) <br />009013 <br />104 <br />102 <br />50-150 <br />2 <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 />