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Page 18 of 28 <br /> C!,,science <br /> environmental Quality Control - Spike/Spike Duplicate <br /> AL aboratories, Inc. <br /> Cardno ERI Date Received: 09/24/11 <br /> 601 North McDowell Blvd. Work Order No: 11-09-1646 <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 /> 11-09-1546-10 Aqueous GC/MS L 09/28/11 09/28/11 110928501 <br /> Parameter SPIKE ADDED MS%REQ MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 10.00 106 107 76-124 1 0-20 <br /> Toluene 10.00 98 100 80-120 2 0-20 <br /> Ethylbenzene 10.00 101 106 78-126 5 0-20 <br /> Methyl-t-Butyl Ether(MTBE) 10.00 88 87 67-121 1 0-49 <br /> Tert-Butyl Alcohol(TBA) 50.00 150 213 36-162 35 0-30 HX.BA <br /> Diisopropyl Ether(DIPE) 10.00 82 84 60-138 2 0-45 <br /> Ethyl-t-Butyl Ether(ETBE) 10.00 89 92 69-123 3 0-30 <br /> Tert-Amyl-Methyl Ether(TAME) 10.00 100 99 65-120 1 0-20 <br /> Ethanol 100.0 97 102 30-180 5 0-72 <br /> 1,2-Dibromoethane 10.00 106 109 80-120 3 0-20 <br /> 1,2-Dichloroethane 10.00 109 107 80-120 2 0-20 <br /> U <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 />