Record Details
page 29
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 29 Diamond Fork System Final Supplement to the Final Environmental Impact Statement, page 29 |
| Coverage | Electronic reproduction; |
| Format | 29 text/PDF |
| Rights | Brigham Young University; http://lib.byu.edu/about/copyright/generic.php Public Domain Public |
| Language | English; eng; en |
| Relation | Central Utah Project; Western Waters Digital Library; comment letter no 13 page 29 of 36 432.1 4321 4321 upper spanish fork river the second paragraph discusses flows under baseline condition need similar discussion of flows for sixth water and diamond fork creeks page 510 5 10 0 5311.1 53111 tanner ridge tunnel sixth water crossing references in this section to the sixth water crossing site suggest 2 that there will be no wetland disturbance because the site was disturbed during previous construction of syartunnel syar tunnel Is this the case was the site not adequately restored following syar construction page 510 5 10 and 511 5 11 0 unnamed drainage there are several references on this page to the crossing of a unnamed drainage 4 crossings with tanner ridge tunnel access road and once with the diamond fork siphon this drainage is generally dry but carries spring snowmelt snowbelt snow melt as well as summer thunderstorm flows these crossings should be designed to minimize short term ie during construction and longterm long term sediment contributions to the dry channel to prevent mobilizing of sediments during active flow periods and subsequent transport into the live stream below disturbed areas should be re vegetated there is also discussion of widening of red hollow road and several crossings by the pipeline and access roads again all practical precautions to prevent sediment from entering the drainage during and following construction should be taken during construction and for several years afterwards until seeded areas are established it will be necessary to monitor the effectiveness of cu lverts placed in drainage ways as well as those used to drain access roads it will also be necessary to monitor drainage patternsimpacts patterns impacts resulting from culvert outflow the road surface and road drainage must be maintained for the life of the project page 511 5 11 5311.3 53113 diamond fork siphon this paragraph states that the siphon will be constructed parallel to the creek for 2300 feet without impacting riparian ie wetland vegetation given the narrow width of the canyon bottom this is difficult to imagine unless the siphon is placed on the steep sidehill there seems to be a critical discrepancy here which could greatly alter the actual number of acres of wetland impacted page 511 5 11 and 512 5 12 5312.2 53122 diamond fork creek below three forks the last sentence in the first paragraph states under baseline conditions it is difficult for intermediate size classes of woody riparian species to mature because of continual channel migration and instability this is true only in part it is important to separate species like coyote willow which responds rapidly on recently disturbed sites from cottonwood for cottonwood it is probably more accurate to state that age class diversity cannot develop on most sites because cottonwood seedlings cannot establish under the existing flow regime high summer flows remove any seedlings that might germinate on spring flood surfaces indeed channel migration has played a role in eliminating existing existing mature stands but the lack of age class diversity is better explained by lack of establishment of new young stands 28 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/9549 |
