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Page 16 of 28 <br />tiff eurofins Quality Control - LCS <br />i Calscience <br />Cardno ERI Date Received: 02/10/15 <br />601 North McDowell Blvd. Work Order: 15-02-0688 <br />Petaluma, CA 94954-2312 Preparation: EPA 5030C <br />Method: EPA 8260B <br />Project: ExxonMobil 99CAS/022789C Page 3 of 4 <br />Quality Control Sample ID i-yl)e <br />Matrix Instrument <br />Date Prepared Date Analyzed LCS Batch Number <br />099-12-884-1235 LCS <br />Aqueous GCIM5 L <br />02114/15 02114115 16:90 1502141.014 <br />Parameter <br />Spike Added Conc. Recovered <br />LCS %Rec. %Rec. CL <br />ME CL Qualifiers <br />Benzene <br />10.00 <br />9.487 <br />95 <br />80-120 <br />73-127 <br />Toluene <br />10.00 <br />9.350 <br />94 <br />80-120 <br />73-127 <br />Ethylbenzene <br />10.00 <br />9.818 <br />98 <br />80-120 <br />73-127 <br />o -Xylene <br />10.00 <br />10.57 <br />106 <br />80-120 <br />73-127 <br />p/m-Xylene <br />20.00 <br />20.16 <br />101 <br />80-120 <br />73-127 <br />Methyl -t -Butyl Ether (MTBE) <br />10.00 <br />10.19 <br />102 <br />75-123 <br />67-131 <br />Tert-Butyl Alcohol (TBA) <br />50.00 <br />51.06 <br />102 <br />80-120 <br />73-127 <br />Diisopropyl Ether (DIPE) <br />10.00 <br />9.764 <br />98 <br />73-121 <br />65-129 <br />Ethyl -t -Butyl Ether (ETBE) <br />10.00 <br />9.802 <br />98 <br />76-124 <br />68-132 <br />Tert-Amyl-Methyl Ether (TAME) <br />10.00 <br />9.971 <br />100 <br />80-120 <br />73-127 <br />1,2-Dibromoethane <br />10.00 <br />9.723 <br />97 <br />80-120 <br />73-127 <br />1,2-Dichloroethane <br />10.00 <br />9.077 <br />91 <br />80-122 <br />73-129 <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 />