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Page 17 of 28 <br /> Lalscience <br /> environmental Quality Control - Spike/Spike Duplicate <br /> AL abora tories, 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 /> W-39-MW1 Aqueous GC/MS L 09/27/11 09/28/11 110927502 <br /> Parameter SPIKE ADDED MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 10.00 110 99 76-124 10 0-20 <br /> Toluene 10.00 101 105 80-120 4 0-20 <br /> Ethylbenzene 10.00 100 105 78-126 6 0-20 <br /> Methyl-t-Butyl Ether(MTBE) 10.00 95 97 67-121 2 0-49 <br /> Tert-Butyl Alcohol(TBA) 50.00 266 116 36-162 79 0-30 HX.BA <br /> Diisopropyl Ether(DIPE) 10.00 96 93 60-138 4 0-45 <br /> Ethyl-t-Butyl Ether(ETBE) 10.00 103 99 69-123 4 0-30 <br /> Tert-Amyl-Methyl Ether(TAME) 10.00 104 99 65-120 5 0-20 <br /> Ethanol 100.0 87 110 30-180 24 0-72 <br /> 1,2-Dibromoethane 10.00 107 107 80-120 0 0-20 <br /> 1,2-Dichloroethane 10.00 114 103 80-120 9 0-20 <br /> U <br /> z <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 />