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TABLE 3 (Cont.) <br />Spillway Data Summary <br />Sediment Pond 002 <br />Orifice Coef. 0.600 <br />Manning Coef. 0.025 <br />Inlet Elevation. 5700.10 <br />25-year, 24-hour Peak <br />Stage. 5700.75 <br />The entrance to the emergency spillway is located more than three (3) <br />feet above the principal spillway. There will be no flow through the <br />emergency spillway inlet as a result of the runoff from a 10-year, <br />24-hour precipitation event or less. The peak stage of the 25-year, <br />24-hour storm event (Elev. 5700.75) is approximately 2.5 feet below the <br />top of the embankment. The emergency spillway is capable of passing the <br />runoff from the 100-year, 24-hour storm event with approximately two <br />feet of freeboard to ensure no overtopping of the embankment. <br />Construction Summary <br />In accordance with Rule 4, Part 4.05.6(7) of the Rules and Regulations <br />of the Colorado Mined Land Reclamation Board pursuant to the Colorado <br />Surface Coal Mining Reclamation Act 34-33-101 et seq., I, James Gary <br />Schlenvogt, hereby certify that the construction of Sedimentation Pond <br />002 was inspected and constructed under my superivision. From October <br />21 until November 4, 1987 during construction, I was on site to inspect <br />and supervise construction of this structure. I, James Gary Schlenvogt, <br />am a 1975 graduate in civil engineering and I have been a Registered <br />Professional Engineer in Colorado since October 17, 1980. <br />The purpose of my inspection and certification was to ensure proper <br />construction of Sedimentation Pond 002 and to satisfy the requirements <br />of Rule 4.05.6(7) of the Colorado Mined Land Reclamation Division. The <br />material was placed in the embankment to meet or exceed the design <br />specifications. The compaction tests exceeded the design <br />specifications. This as-built report confirms the construction of this <br />structure meets or exceeds the Rules and Regulations of the Colorado <br />Mined Land Reclamation Division. The structure is stable, evidencing no <br />• indications of slope instability. <br />6 <br />