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2009-06-30_REVISION - M1981302
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2009-06-30_REVISION - M1981302
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Entry Properties
Last modified
9/9/2022 4:42:09 PM
Creation date
8/25/2011 1:25:09 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1981302
IBM Index Class Name
Revision
Doc Date
6/30/2009
Doc Name
As-Built Drawings of Perimeter Levee- Signed Levee Report.
From
The Regents of Univ. of Colorado
To
DRMS
Type & Sequence
TR8
Media Type
D
Archive
No
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Report in Support of the Recertification of the <br />University of Colorado's Flood Control Levee <br />Page 16 <br />and toe of the gravel pit since it was first excavated more than 20 years ago. They have never <br />posed a problem for slope stability, nor for the gravel mining operation. <br />The stability of the Levee was determined by CTL /Thompson under two scenarios which involve <br />the seeps: the first assumes that the seeps are fed by the regional ground water; the second <br />assumes that the seeps are fed by the Dry Creek Ditch Number 2. CTL /Thompson concluded: <br />"The analysis indicates the existing levee meets FEMA slope requirements for the ground <br />water conditions believed to exist and if the seeps are fed solely from ditch water loss. " 4 <br />The seeps do not transport soil particles through the Levee nor through the naturally occurring <br />sand and gravel upon which it rests; the water which surfaces is clear. The nature of the material <br />that the Levee is constructed of, and that of the naturally occurring sand and gravel under it are <br />not conducive to piping. CTL /Thompson concludes: <br />"In our opinion, the seeps are not presently affecting the structural integrity of the levee <br />and the integrity of the levee will not be affected by the 100 year flood event." <br />The seeps were revisited by CTL /Thompson in February 2008. Based on CTL /Thompson's <br />investigations, it is the opinion of the author of this report that the seeps do not pose a problem <br />for the Levee, but it is recommended that they be monitored annually, and after any flood which <br />may reach the Levee, as part of the University's operation and maintenance plan (Appendix B- <br />11). The seeps have been monitored as part of the ongoing monitoring of the Levee (see <br />Appendix H). <br />X.5. Geotechnical Update 2008 <br />LRE asked CTL /Thompson to re- evaluate the geotechnical considerations of the Levee as it <br />existed in 2008 in light of Boulder's updated hydrologic and hydraulic studies. CTL /Thompson <br />reviewed it's earlier geotechnical work (Appendix B -9), obtained and reviewed aerial <br />photographs and the Levee inspection reports (Appendix H), and it made an additional field <br />inspection of the Levee in February 2008. Mr. Frank Holliday, P.E. was the principal in charge <br />for the 1998 and 2008 evaluations. In a letter dated March 12, 2008 (see Appendix E), <br />CTL /Thompson confirmed that there was ... <br />"... no visual evidence, photographic evidence or written evidence of changes in the <br />levee configuration or seepage reported in the August 1999 CTL /T report. Therefore, we <br />opine the conclusions reached in the August 1999, CTL /T report remain applicable. ,,6 <br />Mr. Holliday also confirmed that the Levee and CTL /Thompson's 1999 analyses and report <br />conform to the Code of Federal Regulations (CFR) Title 44: Emergency Management and <br />Assistance, Part 65 — Identification and Mapping of Special Hazard Areas, Article 65.10 Item (4) <br />Embankment and Foundation Stability, and Item (5) Settlement: <br />4 Ibid, page 11 (Appendix B -9). <br />s Ib page 9 (Appendix B -9). <br />6 CTL /Thompson, Inc., letter "Geotechnical Engineering Consultation," March 12, 2008, page 1, (Appendix B -9). <br />© Leonard Rice Engineers, Inc. June 2009 — 207FIP05 <br />
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