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Page 22 of 32 <br /> a/science <br /> nvironmenta/ Quality Control - Spike/Spike Duplicate <br /> aborator/es, 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 4 of 4 <br /> Quality Control Sarnl)le ID Type Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> 13.12-1629.15 Sample Aqueous GCIMS L 12/31/13 /2/31113 12:39 131231501 <br /> 13.12.1629.15 Matrix Spike Aqueous GCIMS L 92/31113 12/31/13 14:02 131231501 <br /> 13-12-1629-15 Matrix Spike Duplicate Aqu®auS GCIMS L 12131/13 12131113 14:30 131231501 <br /> Parameter Sample Spike MS MS MSD MSD %Rec.CL RPD RPD CL Qualifiers <br /> Conc. Added Conc. °oRec. Conc. %-Re c. <br /> Benzene ND 10.00 10.30 103 10.27 103 76-124 0 0-20 <br /> Toluene ND 10.00 10.44 104 10.26 103 80-120 2 0-20 <br /> Ethylbenzene ND 10.00 10.11 101 10.13 101 78-126 0 0-20 <br /> o-Xylene ND 10.00 9.560 96 9.654 97 70-130 1 0-30 <br /> p/m-Xylene ND 20.00 19.96 100 19.81 99 70-130 1 0-30 <br /> Methyl-t-Butyl Ether(MTBE) ND 10.00 10.60 106 11.23 112 67-121 6 0-49 <br /> Tert-Butyl Alcohol(TBA) ND 50.00 48.29 97 56.24 112 36-162 15 0-30 <br /> Diisopropyl Ether(DIPE) ND 10.00 11.45 115 11.59 116 60-138 1 0-45 <br /> Ethyl-t-Butyl Ether(ETBE) ND 10.00 10.92 109 11.15 112 69-123 2 0-30 <br /> Tert-Amyl-Methyl Ether(TAME) ND 10.00 10.50 105 10.51 105 65-120 0 0-20 <br /> 1,2-Dibromoethane ND 10.00 10.50 105 10.10 101 80-120 4 0-20 <br /> 1,2-Dichloroethane ND 10.00 10.40 104 10.25 103 80-120 1 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 />