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Page 21 of 33 <br />is ence <br />nvdrvnmental Quality Control - Spike/Spike Duplicate '' <br />ab r t ries Inc. <br />orato <br />Cardno ERI Date Received: 05/05/12 <br />601 North McDowell Blvd. Work Order No: 12-05-0453 <br />Petaluma, CA 94954-2312 Preparation: EPA 5030C <br />Method: EPA 8260B <br />Project ExxonMobil99CAS/022789C <br />Date Date MS/MSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />W-32-MW1 Aqueous GC/MS L 05/07/12 05/08/12 120507502 <br />Parameter <br />SPIKE ADDED <br />MS %REC <br />MSD %REC <br />%REC CL <br />RPD <br />RPD CL Qualifiers <br />Benzene <br />10.00 <br />105 <br />104 <br />76-124 <br />1 <br />0-20 <br />Toluene <br />10.00 <br />112 <br />110 <br />80-120 <br />2 <br />0-20 <br />Ethylbenzene <br />10.00 <br />101 <br />98 <br />78-126 <br />3 <br />0-20 <br />Methyl -t -Butyl Ether (MTBE) <br />10.00 <br />91 <br />88 <br />67-121 <br />4 <br />0-49 <br />Tert-Butyl Alcohol (TBA) <br />50.00 <br />250 <br />145 <br />36-162 <br />53 <br />0-30 HX,BA <br />Diisopropyl Ether (DIPE) <br />10.00 <br />114 <br />113 <br />60-138 <br />1 <br />0-45 <br />Ethyl -t -Butyl Ether (ETBE) <br />10.00 <br />105 <br />103 <br />69-123 <br />1 <br />0-30 <br />Tert-Amyl-Methyl Ether (TAME) <br />10.00 <br />87 <br />83 <br />65-120 <br />4 <br />0-20 <br />1,2-Dibromoethane <br />1,2-Dichloroethane <br />RPD - Relative Percent Difference , CL - Control Limit <br />10.00 103 100 80-120 3 0-20 <br />10.00 107 103 80-120 4 0-20 <br />7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 FAX: (714) 894-7501 <br />