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5.0 Summary <br />The capacity of Pond 002 is attributed to highwall pit excavation. The pond contains sufficient <br />storage capacity and retention time to meet discharge effluent limitations and the intentions of Rule <br />4.05.2(7). The combination spillway has been designed to safely pass the peak runoff from the 25- <br />year, 24 -hour event. <br />The impoundment was designed and constructed to be stable and provide adequate freeboard, <br />therefore, the structure complies with the appropriate rules and regulations for a sedimentation <br />structure. Sage Creek Coal Company will periodically inspect the structure for sediment storage, <br />structural integrity and hazardous conditions. Maintenance or remedial work will be performed in <br />accordance with the approved mine permits. <br />6.0 Design Certification <br />The impoundment and associated structures are pre - existing. The construction as -built drawings <br />were prepared under the supervision of others. The original design and as -built configuration were <br />completed by Seneca Coal Company and certified by Mr. Ronald J. Gerkhe, a Colorado registered <br />professional engineer (P.E. No. 19959) experienced in the design and construction of earthen <br />structures. <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. Drawing Sediment Pond 002 As- Built, presents the existing impoundment <br />configuration. To the best of my knowledge, based on my professional expertise, Pond 002 was <br />designed and constructed in accordance with prudent state -of -the -art of earthen embankment <br />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 Board for Coal Mining. Therefore, pursuant to Rules <br />4.05.6 and 4.05.9, this is the Pond 002 design report. <br />\ \ \ \\\\\\ �� P OO�I I IRIE� <br />W. <br />_= <br />v 26046 c <br />o'• <br />ON <br />djL k 0 <br />dl <br />Mic el W. Luo 1W <br />Colorado P.E. 26046 <br />2.05.3 -E2.A5 12/09 <br />