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of 6,950.6 feet (see Addendum 7-6c.1B). The emergency spillway <br />configuration was checked using the SE DCAD9 Channel Utility (see Addendum <br />7-6c.1C) to show that the as-built configuration can safely pass the 25- <br />year, 29-hour discharge. The channel utility shows a flow depth of <br />approximately 1.2 feet, which would be approximately 1.8 feet below the top <br />of the embankment (6,953.0 feet). If the principal spillway were to clog, <br />or become inoperable for some other reason, the SEDCAD9 modeling shows that <br />the emergency spillway can safely pass the peak discharge from the 25-year, <br />24-hour storm event. Pond 009 is constructed and operated in compliance <br />with Rule 9.05.9(2)(C)(ii). <br />Certification Statement <br />The earthen impoundment and emergency spillway are pre-existing. The <br />original design, as-built plans and modifications were prepared under the <br />supervision of others. Pond 004 was originally constructed as shown on <br />Exhibit 7-12, Pond #009 and certified by Ronald J. Gehrke, a registered <br />professional engineer in the State of Colorado experienced in the design <br />and construction of earthen structures. <br />I am a registered professional engineer in the State of Colorado • <br />experienced in the design, construction and operation of earthen <br />structures. I have reviewed the as-built documents and inspected the site. <br />Exhibit 7-12A, Pond 009 Principal Spillway Replacement As-Built, presents <br />the existing configuration of the pond, including the new principal <br />spillway. The new principal spillway is an 6-inch plastic corrugated <br />straight pipe. It is in my opinion, based on the original design <br />assumptions presented in Appendix 7-6c and the 2005 as-built data, that <br />Pond 009 will meet the requirements of Rules 9.05.6(3)(a), 9.05.9(2)(b) and <br />9.05.9(2)(c)(ii). <br />TR-37 9 Revised 10/OS • <br />