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Page 22 of 38 <br /> alscience <br /> l ,. <br /> &nvironmental Quality Control - Spike/Spike Duplicate ° <br /> � aboratories, Inc. <br /> `r <br /> Cardno ERI Date Received: 12/03/11 <br /> 601 North McDowell Blvd. Work Order No: 11-12-0206 <br /> Petaluma, CA 94954-2312 Preparation: EPA 5030C <br /> Method: EPA 8260B <br /> Proiect ExxonMobil99CAS/022789C <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> W-33-DW4 _ Aqueous GC/MS L 12/06/11 12/06111 111206501 i <br /> Parameter SPIKE ADDED MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 10.00 91 93 76-124 2 0-20 <br /> Toluene 10.00 92 95 80-120 2 0-20 <br /> Ethylbenzene 10.00 94 95 78-126 1 0-20 <br /> Methyl-t-Butyl Ether(MTBE) 10.00 95 95 67-121 0 0-49 <br /> Tert-Butyl Alcohol(TBA) 50.00 93 98 36-162 4 0-30 <br /> Diisopropyl Ether(DIPE) 10.00 91 92 60-138 1 0-45 <br /> Ethyl-t-Butyl Ether(ETBE) 10.00 93 92 69-123 2 0-30 <br /> Tert-Amyl-Methyl Ether(TAME) 10.00 90 93 65-120 3 0-20 <br /> Ethanol 100.0 101 107 30-180 6 0-72 <br /> 1,2-Dibromoethane 10.00 94 93 80-120 1 0-20 <br /> 1,2-Dichloroethane 10.00 104 108 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 />