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a/science <br />rnironmental <br />aboratories, Inc. <br />Cardno ERI <br />601 North McDowell Blvd. <br />Petaluma, CA 94954-2312 <br />Quality Control - Spike/Spike Duplicate <br />Project ExxonMobil99CAS/022789C <br />Page 20 of 43 <br />Date Received: 05/26/11 <br />Work Order No: 11-05-1637 <br />Preparation: EPA 5030C <br />Method: EPA 8260B <br />Date Date MS/MSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />W-33-MW1 Aqueous GC/IVIS L 05126111 05127/11 110526S02 <br />Parameter <br />MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />Benzene <br />119 <br />115 <br />76-124 <br />3 <br />0-20 <br />Toluene <br />112 <br />109 <br />80-120 <br />3 <br />0-20 <br />Ethylbenzene <br />110 <br />106 <br />78-126 <br />4 <br />0-20 <br />Methyl -t -Butyl Ether (MTBE) <br />126 <br />126 <br />67-121 <br />0 <br />0-49 3 <br />Tert-Butyl Alcohol (TBA) <br />162 <br />106 <br />36-162 <br />42 <br />0-30 4 <br />Diisopropyl Ether (DIPE) <br />128 <br />128 <br />60-138 <br />0 <br />0-45 <br />Ethyl -t -Butyl Ether (ETBE) <br />121 <br />119 <br />69-123 <br />2 <br />0-30 <br />Tert-Amyl-Methyl Ether (TAME) <br />108 <br />109 <br />65-120 <br />1 <br />0-20 <br />Ethanol <br />122 <br />103 <br />30-180 <br />16 <br />0-72 <br />1,2-Dibromoethane <br />113 <br />111 <br />80-120 <br />2 <br />0-20 <br />1,2-Dichloroethane <br />121 <br />116 <br />80-120 <br />3 <br />0-20 3 <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 />