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Page 17 of 28 <br />tiff eurofins Quality Control - LCS <br />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 4 of 4 <br />Quality Control Sample ID Type <br />Matrix Instrument <br />Date Prepared Date Analyzed LCS Batch Number <br />099.12-884.1234 LCS <br />Aqueous GCWS T <br />02112115 02112115 17:05 150212LOSO <br />Parameter <br />Spike Added Conc. Recovered <br />LCS %Rec. %Rec. CL <br />ME CL Qualifiers <br />Benzene <br />10.00 <br />9.283 <br />93 <br />80-120 <br />73-127 <br />Toluene <br />10.00 <br />9.753 <br />98 <br />80-120 <br />73-127 <br />Ethylbenzene <br />10.00 <br />10.44 <br />104 <br />80-120 <br />73-127 <br />o -Xylene <br />10.00 <br />11.21 <br />112 <br />80-120 <br />73-127 <br />p/m-Xylene <br />20.00 <br />21.17 <br />106 <br />80-120 <br />73-127 <br />Methyl -t -Butyl Ether (MTBE) <br />10.00 <br />9.884 <br />99 <br />75-123 <br />67-131 <br />Tert-Butyl Alcohol (TBA) <br />50.00 <br />51.56 <br />103 <br />80-120 <br />73-127 <br />Diisopropyl Ether (DIPE) <br />10.00 <br />10.76 <br />108 <br />73-121 <br />65-129 <br />Ethyl -t -Butyl Ether (ETBE) <br />10.00 <br />10.38 <br />104 <br />76-124 <br />68-132 <br />Tert-Amyl-Methyl Ether (TAME) <br />10.00 <br />9.435 <br />94 <br />80-120 <br />73-127 <br />1,2-Dibromoethane <br />10.00 <br />9.703 <br />97 <br />80-120 <br />73-127 <br />1,2-Dichloroethane <br />10.00 <br />9.348 <br />93 <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 />