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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. TR-42 presents revised sediment <br />storage capacity calculations that use the existing, as-built <br />configuration. 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 4.05.6(3)(a), 4.05.9(2)(b) and <br />4.05.9(2)(c)(ii). <br />~~\\\\\\\\1111 I I I I I I I I I/I <br />\~~~~ POQ REG~S~ii,,~ <br />fo `~, <br />~ ; 18406 : ~ <br />o ~; : '_~\ <br />%,FSS /ONA na~~~\ \\~~ <br />mm~ <br />~~.,~~ 9~iy~~~ <br />David A. Hettinger, CO P.E. 18906 Date <br /> <br />TR-92 6 Revised 09/07 <br />