Laserfiche WebLink
r ~ ' <br />of dam. A Troxler nuclear gage was then used to perform the <br />compaction tests. The Geotechnical Services report is attached. <br />The results show that the compaction of the embankment is <br />sufficient for long term stability and safety. <br />13) Slope Stability of Embankment <br />As a professional engineer experienced in embankment slope <br />stability design, construction and maintenance, I am confident <br />that the dam meets the long term slope safety factor of 1.3. In <br />fact, past experience indicates that the slope safety factor is <br />most likely above 2.0. It is stable for the following reasons: <br />- the reconstructed slopes are 2.SH:1.OV, which is mild for a <br />small pond with a height less than 10 feet. <br />- there are no weak spots in the original ground or springs or <br />seeps which could interfere with stability. <br />- the principal spillway has been properly compacted so that <br />piping will not occur. <br />- the dam has been constructed in lifts with proper compaction as <br />the independent data shows. <br />14) Dam Height <br />The dam height as measured from the bottom of the original ground <br />to the bottom of the emergency spillway is 9.9 feet. for this <br />reason, the dam does not meet the large impoundment criteria of <br />Rule 4.05.9(3), the State Engineer's Office or C.R.S. 37-57-105. <br />----------------------------------------------------------------- <br />There was no evidence of cracking, bulging, sliding, seepage or <br />other construction problems. I certify that the sediment pond at <br />the Rimrock Mine has been constructed according to the plans <br />previously mentioned. Prudent state-of-the-art engineering has <br />been employed and the dam is sound, with no current environmental <br />threats or construction problems. <br />. ~,~ <br />~~u'cG'i'' S~13~93 <br />