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Page 22 of 33 <br />alsdence <br />nvironmental Quality Control - Spike/Spike Duplicate <br />, } <br />aboratvries, Inc. � <br />Cardno ERI <br />601 North McDowell Blvd. <br />Petaluma, CA 94954-2312 <br />Proiect ExxonMobil99CAS/022789C <br />Date Received: 05/05/12 <br />Work Order No: 12-05-0453 <br />Preparation: EPA 5030C <br />Method: EPA 82608 <br />Date Date MS/MSD Batch <br />Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br />12-05-0450-1 Aqueous GC1MS L 05/09/12 05/09/12 120509501 <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 />100 <br />99 <br />76-124 <br />1 <br />0-20 <br />Toluene <br />10.00 <br />106 <br />104 <br />80-120 <br />3 <br />0-20 <br />Ethylbenzene <br />10.00 <br />104 <br />103 <br />78-126 <br />1 <br />0-20 <br />Methyl -t -Butyl Ether (MTBE) <br />10.00 <br />97 <br />89 <br />67-121 <br />7 <br />0-49 <br />Tert-Butyl Alcohol (TBA) <br />50.00 <br />142 <br />122 <br />36-162 <br />15 <br />0-30 <br />Diisopropyl Ether (DIPE) <br />10.00 <br />100 <br />97 <br />60-138 <br />3 <br />0-45 <br />Ethyl -t -Butyl Ether (ETBE) <br />10.00 <br />103 <br />100 <br />69-123 <br />4 <br />0-30 <br />Tert-Amyl-Methyl Ether (TAME) <br />10.00 <br />101 <br />95 <br />65-120 <br />6 <br />0-20 <br />Ethanol <br />100.0 <br />100 <br />99 <br />30-180 <br />0 <br />0-72 <br />1,2-Dibromoethane <br />10.00 <br />103 <br />97 <br />80-120 <br />6 <br />0-20 <br />1,2-Dichloroethane <br />10.00 <br />105 <br />102 <br />80-120 <br />3 <br />0-20 <br />RPD -Relative Percent Difference , CL - Control Limit <br />W" <br />7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 - FAX: (714) 894-7501 <br />