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Page 25 of 32 <br /> a/science <br /> , _nvironmenta/ Quality Control - LCS/LCSD <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 3010A Total <br /> Method: EPA 6010B <br /> Project: ExxonMobil 99CAS/022789C Page 3 of 5 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed LCS/LCSD Batch Number <br /> 097-01-003-13914 LCS Aqueous ICP 7300 12123113 1212611315:42 131223LA9 <br /> 097-01-003-13914 LCSD Aqueous ICP 7300 12/23113 12/26113 15:54 131223LA9 <br /> Parameter alam LCS LCS LCSD LCSD ° Rec.CIL RPD RPD CL Qualifiers <br /> Added Conc. %Rec. Conc. ° Rec. <br /> Arsenic 0.5000 0.4803 96 0.4755 95 80-120 1 0-20 <br /> Cadmium 0.5000 0.5002 100 0.4994 100 80-120 0 0-20 <br /> Lead 0.5000 0.4970 99 0.4902 98 80-120 1 0-20 <br /> Selenium 0.5000 0.4574 91 0.4472 89 80-120 2 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 />