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Page 21 of 32 <br /> `!/science <br /> nvironmenta/ Quality Control - Spike/Spike Duplicate <br /> A aboratories, Inc. <br /> Cardno ERI Date Received: 12/21/13 <br /> 601 North McDowell Blvd. Work Order: 13-12-1796 <br /> Petaluma, CA 94954-2312 Preparation: EPA 5030C <br /> Method: EPA 8260B <br /> Project: ExxonMobil 99CAS/022789C Page 3 of 4 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> W-34-DW3 Sample Aqueous GC/MS L 12/30/13 12/31/13 03:28 131230502 <br /> W-34-DW3 Matrix Spike Aqueous GC/MS L 12130/13 12/31/13 06:42 131230502 <br /> W-34-DW3 Matrix Spike Duplicate Aqueous GC/MS L 12/30/13 12/31/13 07:10 131230502 <br /> Parameter Sample Spike MS MS MSD MSD %Rec.CL RPD RPD CL Qualifiers <br /> Conc. Added Conc. %Rec. Conc. 7o-Re-c. <br /> Benzene ND 10.00 11.09 111 10.29 103 76-124 7 0-20 <br /> Toluene 1.123 10.00 11.66 105 10.91 98 80-120 7 0-20 <br /> Ethylbenzene 0.5990 10.00 10.84 102 10.33 97 78-126 5 0-20 <br /> o-Xylene 1.070 10.00 10.93 99 10.45 94 70-130 4 0-30 <br /> p/m-Xylene 2.163 20.00 22.11 100 21.07 95 70-130 5 0-30 <br /> Methyl-t-Butyl Ether(MTBE) ND 10.00 11.40 114 10.95 110 67-121 4 0-49 <br /> Tert-Butyl Alcohol (TBA) ND 50.00 72.66 145 54.56 109 36-162 28 0-30 <br /> Diisopropyl Ether(DIPE) ND 10.00 12.09 121 11.58 116 60-138 4 0-45 <br /> Ethyl-t-Butyl Ether(ETBE) ND 10.00 11.44 114 11.05 110 69-123 3 0-30 <br /> Tert-Amyl-Methyl Ether(TAME) ND 10.00 11.04 110 10.53 105 65-120 5 0-20 <br /> 1,2-Dibromoethane ND 1000 11.22 112 10.85 108 80-120 3 0-20 <br /> 1,2-Dichloroethane ND 10.00 11.96 120 11.12 111 80-120 7 0-20 <br /> RPD:Relative Percent Difference. CL:Control Limits <br /> 7440 Lincoln Way, Garden Grove,CA 92841-1427 • TEL:(714)895-5494 - FAX:(714)894-7501 <br />