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Page 7 of 14 <br />alscience <br />environmental Quality Control - Spike/Spike Duplicate <br />A aboratories, Inc. <br />Cardno ERI Date Received: 09/01/11 <br />601 North McDowell Blvd. Work Order No: 11-09-0023 <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 />11-09-0031-1 Aqueous GC/MS BB 09/02/11 09/02/11 110902501 <br />Parameter <br />MS %REC MSD %REC %REC CL RPD RPD CL Qualifiers <br />Benzene <br />94 <br />95 <br />76-124 <br />1 <br />0-20 <br />Toluene <br />97 <br />99 <br />80-120 <br />1 <br />0-20 <br />Ethylbenzene <br />99 <br />98 <br />78-126 <br />0 <br />0-20 <br />Methyl -t -Butyl Ether (MTBE) <br />89 <br />93 <br />67-121 <br />4 <br />0-49 <br />Tert-Butyl Alcohol (TBA) <br />98 <br />88 <br />36-162 <br />11 <br />0-30 <br />Diisopropyl Ether (DIPE) <br />93 <br />96 <br />60-138 <br />4 <br />0-45 <br />Ethyl -t -Butyl Ether (ETBE) <br />92 <br />96 <br />69-123 <br />4 <br />0-30 <br />Tert-Amyl-Methyl Ether (TAME) <br />87 <br />88 <br />65-120 <br />1 <br />0-20 <br />Ethanol <br />111 <br />94 <br />30-180 <br />16 <br />0-72 <br />1,2-Dibromoethane <br />93 <br />90 <br />80-120 <br />3 <br />0-20 <br />1,2-Dichloroethane <br />91 <br />92 <br />80-120 <br />1 <br />0-20 <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 />