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Page 21 of 36 <br /> ■r alscience <br /> nvironrnenta! Quality Control - Spike/Spike Duplicate <br /> aboratories Inc. <br /> Cardno ERI Date Received: 03/17/12 <br /> 601 North McDowell Blvd. Work Order No: 12-03-1242 <br /> Petaluma, CA 94954-2312 Preparation: EPA 5030C <br /> Method: EPA 82606 <br /> Project ExxonMobil99CAS/022789C <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 12-03-1156-2 Aqueous GC/MS L 03/22/12 03122112 120322S01 <br /> Parameter SPIKE ADDED MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 10.00 115 112 76-124 2 0-20 <br /> Toluene 10.00 114 115 80-120 1 0-20 <br /> Ethylbenzene 10.00 119 115 78-126 3 0-20 <br /> Methyl-t-Butyl Ether(MTBE) 10.00 116 112 67-121 4 0-49 <br /> Tert-Butyl Alcohol(TBA) 50.00 123 111 36-162 11 0-30 <br /> Diisopropyl Ether(DIPE) 10.00 111 116 60-138 4 0-45 <br /> Ethyl-t-Butyl Ether(ETBE) 10.00 115 110 69-123 5 0-30 <br /> Tert-Amyl-Methyl Ether(TAME) 10.00 114 107 65-120 6 0-20 <br /> Ethanol 100.0 108 106 30-180 2 0-72 <br /> 1,2-Dibromoethane 10.00 113 109 80-120 4 0-20 <br /> 1,2-Dichloroethane 10.00 117 112 80-120 4 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 />