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Page 29 of 36 <br /> L alscience <br /> i nvironmental <br /> Quality Control - LCS/LCS Duplicate Q�� •' ' `'� <br /> aboratories, Inc. <br /> Cardno ERI Date Received: N/A <br /> 601 North McDowell Blvd. Work Order No: 12-03-1242 <br /> Petaluma, CA 94954-2312 Preparation: EPA 5030C <br /> Method: EPA 8260B <br /> Project: ExxonMobil99CAS/022789C <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-12-884-823 Aqueous GUMS L 03/26/12 03/26/12 12032611-01 <br /> Parameter SPIKE ADDED LCS%REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Benzene 10.00 103 104 80-120 73-127 1 0-20 <br /> Toluene 10.00 106 104 80-120 73-127 2 0-20 <br /> Ethylbenzene 10.00 109 110 80-120 73-127 1 0-20 <br /> Methyl-t-Butyl Ether(MTBE) 10.00 112 114 69-123 60-132 2 0-20 <br /> Tert-Butyl Alcohol(TBA) 50.00 102 100 63-123 53-133 2 0-20 <br /> Diisopropyl Ether(DIPE) 10.00 107 111 59-137 46-150 3 0-37 <br /> Ethyl-t-Butyl Ether(ETBE) 10.00 111 109 69-123 60-132 1 0-20 <br /> Tert-Amyl-Methyl Ether(TAME) 10.00 106 105 70-120 62-128 1 0-20 <br /> Ethanol 100.0 97 98 28-160 6-182 1 0-57 <br /> 1,2-Dibromoethane 10.00 103 106 79-121 72-128 3 0-20 <br /> 1,2-Dichloroethane 10.00 103 103 80-120 73-127 0 0-20 <br /> Total number of LCS compounds: 11 <br /> Total number of ME compounds: 0 <br /> Total number of ME compounds allowed: I <br /> LCS ME CL validation result: Pass <br /> RPD-Relative Percent Difference, CL-Control Limit <br /> W/k <br /> 7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 . FAX: (714)894-7501 <br />