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Page 27 of 32 <br /> alscience <br /> nvironmenta/ Quality Control - LCS <br /> aboratories, Inc. <br /> Cardno ERI Date Received: 12/21/13 <br /> 601 North McDowell Blvd. Work Order: 13-12-1796 <br /> Petaluma, CA 94954-2312 Preparation: EPA 5030C <br /> Method: EPA 8260B <br /> Project: ExxonMobil 99CAS/022789C Page 5 of 5 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed LCS Batch Number <br /> 099.12.884-1115 LCS Aqueous GCIIVIS L 12131113 12/31/13 10:58 131231 L02 <br /> Parameter Spike Added Conc. LCS%Rec. %Rec.CL ME CL Qualifiers <br /> Recovered <br /> Benzene 10.00 9.774 98 80-120 73-127 <br /> Toluene 10.00 9.640 96 80-120 73-127 <br /> Ethylbenzene 10.00 9.680 97 80-120 73-127 <br /> o-Xylene 10.00 9.081 91 75-125 67-133 <br /> p/m-Xylene 20.00 19.29 96 75-125 67-133 <br /> Methyl-t-Butyl Ether(MTBE) 10.00 11.73 117 69-123 60-132 <br /> Tert-Butyl Alcohol(TBA) 50.00 47.46 95 63-123 53-133 <br /> Diisopropyl Ether(DIPE) 10.00 11.33 113 59-137 46-150 <br /> Ethyl-t-Butyl Ether(ETBE) 10.00 10.95 110 69-123 60-132 <br /> Tert-Amyl-Methyl Ether(TAME) 10.00 10.36 104 70-120 62-128 <br /> 1,2-Dibromoethane 10.00 10.61 106 79-121 72-128 <br /> 1,2-Dichloroethane 10.00 9.345 93 80-120 73-127 <br /> Total number of LCS compounds: 12 <br /> Total number of ME compounds:0 <br /> Total number of ME compounds allowed: 1 <br /> LCS ME CL validation result:Pass <br /> RPD: Relative Percent Difference. CL:Control Limits <br /> 7440 Lincoln Way,Garden Grove,CA 92841-1427 - TEL:(714)895-5494 - FAX:(714)894-7501 <br />