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Page 19 of 28 <br /> Ualscience <br /> nvironmental Quality Control - LCS/LCS Duplicate <br /> aboratories, Inc. <br /> Cardno ERI Date Received: N/A <br /> 601 North McDowell Blvd. Work Order No: 11-09-1646 <br /> Petaluma, CA 94954-2312 Preparation: EPA 3010A Total <br /> Method: EPA 6010B <br /> Project: ExxonMobil99CAS/022789C <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample I❑ Matrix Instrument Prepared Analyzed vumt:er <br /> 097-01-003-11,987 Aqueous ICP 5300 09/26/11 09/27/11 110926LA6 <br /> Parameter SPIKE ADDED LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Arsenic 0.5000 99 94 80-120 5 0-20 <br /> Cadmium 0.5000 108 103 80-120 5 0-20 <br /> Lead 0.5000 113 108 80-120 4 0-20 <br /> Selenium 0.5000 103 98 80-120 5 0-20 <br /> U <br /> 'Y <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 />