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Peabody Sage Creek Mine — Sump Design Report <br />6.0 Design Certification <br />I am a registered professional engineer in the State of Colorado experienced in the design, <br />construction and operation of earthen structures. I have reviewed the design documents and <br />inspected the site. Map 2.05.3 -E2 -D, Upper Sump and Map 2.05.3 -E2 -E, Lower Sump, <br />presents the impoundment configurations. To the best of my knowledge, based on my <br />professional expertise, the Upper Sump and Lower Sump were designed in accordance with <br />prudent state -of -the -art standards for earthen embankment structures. <br />This design report confirms that the design of this structure meets or exceeds the Rules and <br />Regulations of the Colorado Mined Land Reclamation Board for Coal Mining. Therefore, <br />pursuant to Rule 4.05.9, this is the Upper and Lower Sump design report. <br />Z-) <br />ly t� <br />Date <br />TRO1 -10 2.05.3 -E2.E5 2/11 <br />