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Page 20 of 32 <br /> a/science <br /> nvironmenta/ Quality Control - Spike/Spike Duplicate <br /> 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 3010A Total <br /> Method: EPA 6010B <br /> Project: ExxonMobil 99CAS/022789C Page 2 of 4 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed MS/MSD Batch Number <br /> 13-12-1758-1 Sample Aqueous ICP 7300 12123113 12126113 16:57 131223SA9 <br /> 13.12.1758-1 Matrix Spike Aqueous ICP 7300 12123113 12126/13 16:54 1312235A9 <br /> 13-12.1758.1 Matrix Spike Duplicate Aqueous ICP 7300 12123113 12/26/13 16:55 131223SA9 <br /> Parameter Sample Spike MS MS MSD MSD %Rec.CL RPD RPD CL Qualifiers <br /> Conc. Added Conc. %Rec. Conc. %Rec. <br /> Arsenic ND 0.5000 0.5760 115 0.5639 113 80-140 2 0-11 <br /> Cadmium ND 0.5000 0.5339 107 0.5178 104 82-124 3 0-7 <br /> Lead ND 0.5000 0.5248 105 0.5083 102 84-120 3 0-7 <br /> Selenium ND 0.5000 0.5564 111 0.5367 107 79-127 4 0-9 <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 />