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<br />• 146. Rule 4.05.3(3) requires Division approval to use concrete lining in fill ditches. The <br />~ ~ Division is concerned about the long term integrity of a concrete lining. Cracking and <br />/ ~~M breakdown of the lining would most certainly lead to piping, undercutting, and erosion. <br />(\ u"- Concrete spillways, where periodic flows have occurred, have shown a perpensity to <br />f 1 develop this problem. A combination of riprap and vegetation would seem to provide a <br />~ ~ more stable, long-term channel and would likely accommodate flows without serious <br />\~,. erosion problems. Please consider alternative channel linings other than shoterete for <br />~" permanent diversions. <br />147. Please include some text discussion on how adequate information on pond embankment <br />foundation conditions will be gathered and analyzed as required by Rule 4.05.6(11)(a). <br />dQ~~ Also include in this discussion the compaction parameters for pond embankments. <br />~` 148. Embankment crest elevations were compazed to full flow emergency spillway crest <br />elevations for all ponds detailed on EX1S-11. All ponds were in compliance with the 1 <br />,Q,~ ~~ /~ foot minimum freeboard expect Fill 5 pond. SEDCAD+ information was different than <br />"2 ~ the information presented in the pond schedule. Please review and correct as necessary. <br />„u`t°~ <br />~" '\k ~a ]49. Middle Jeff, Fill 2, Fill S, and Fill 8 ponds do not meet the minimum top width required <br />01~ by Rule 4.OS.6(11)(h). Additionally, inconsistent top of embankment information was <br />found between the figure and the pond schedule for Fill 2 and Fill S. <br />. 1 S0. Due to the nature of some of the colluvial materials observed at this site, the Division will <br />~~,,,, ~( require soil classification and gradation information required by Rule 4.05.6(11)(1) for <br />i~\5~v ~~ pond foundations. <br />~~~ 151. Upper Jeff, Middle Jeff, Fill 2, Fill 3, Fil] S, and Fill 8 ponds all need a demonstration <br />~~ of a minimum safety factor of 1.S and a seismic safety factor of 1.2. Other ponds require <br />a safety factor of 1.3. <br />aF 1 2 ~~On the 100 year ditch table, the depth and width values are reversed for Fills 1, 2, and <br />\~ 7y ~b 3. <br />~ 15' <br />/~ ~.-~ 153 Ditch flow directions should be indicated for Fill ditches. <br />~b b <br />154. Ditches DS1A, DS2A, and DS3A aze proposed earthen ditches but each has significant <br />k b~ lengths of 3S% slope. How will these sections be handled as far as channel lining? <br />~~ <br />~~ 1~ . Ditch ll21 discharge is represented as 23.38 in the table but should be 28.38. <br />(J <br />~56. DS3B should be 25.45 in the table and for DS3 the dischazge value should be .58. <br />157. For Fills, Figure EX15-12 shows D52-D57 but the SEDCAD run and the table show D51- <br />. ~L D56. Which is correct? <br />158. For riprap ditch section, please describe the filter layer that will be used for the various <br />D~'l~ <br />/~ %~ <br />