Record Details
page 3-45
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 3-45 Diamond Fork System Final Supplement to the Final Environmental Impact Statement, page 3-45 |
| Coverage | Electronic reproduction; |
| Format | 3-45 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; wetland resources 34641.1 346411 sixth water creek connection to tanner ridge tunnel one crossing under sixth water creek would be required to connect the outlet of sixth water aqueduct to the proposed tanner ridge tunnel inlet via a connecting pipeline under sixth water creek the crossing would be located at the existing outlet of the sixth water aqueduct the creek channel in this location was disturbed when the aqueduct was constructed the connecting pipe would be placed in an open trench crossing sixth water creek the trench would then be filled and the creek channel restored to existing grade it is estimated that 0.24 024 acre of creek be&riverine bedriverine bed riverine habitat would be temporarily disturbed from the pipe crossing and two temporary cofferdams coffer dams about 0.02 002 acre of creek bedriverine bed riverine community type adjacent to the existing flow control facility at sixth water aqueduct would be permanently lost from construction of the inlet box this loss would be a significant impact there is no wetlandriparian wetland riparian habitat adjacent to this previously disturbed creek channel 34641.2 346412 346412 tanner ridge tunnel unnamed drainage crossings A new temporary access road would be cut into the hillside terrain above diamond fork canyon road for access to the tanner ridge tunnel outlet portal which would require crossing 500 feet of an unnamed drainage that only flows during snowmelt snowbelt snow melt runoff and rainstorms brainstorms rain storms the drainage varies from 2 and 4 feet wide and supports no adjacent wetland communities outside the active drainage the vegetation consists of upland species of sagebrush rabbitbrush rabbit brush and scrub oak several intermittent seeps also are present along the drainage but none support permanent flow and would be avoided during construction therefore construction of the tanner ridge tunnel outlet portal access road would cause no loss of wetlands the tanner ridge tunnel outlet portal would be excavated across 300 feet of an intermittent drainage way that contains upland vegetation grasses and forbs and only flows during snowmelt snowbelt snow melt runoff and rainstorms brainstorms rain storms upon completion of the tunnel the drainage way would be restored to convey runoff through the outlet portal area construction of the outlet portal would produce rock waste material that would be disposed in an upland area on the west side of tanner ridge the excavation and disposal of the rock waste material would not affect any wetlands 34641.3 346413 346413 diamond fork siphon diamond fork creek and unnamed drainage crossings construction of diamond fork siphon would require one crossing of diamond fork creek the siphon would be constructed outside the diamond fork creek channel and riparian area except where it crosses under the creek the creek channel is approximately 16 feet wide at the crossing and the riparian shrub type extends approximately 10 feet from the east side and a maximum of 150 feet from the west side of the creek the creek crossing would require excavation and riparian shrub removal within a 100 foot wide right of way section of the creek the creek would be restored to preconstruction pre construction grade and the banks revegetated vegetated re with riparian species the total temporary disturbance would be 0.09 009 acre of creek bedriverine bed riverine and 0.60 060 060 ogo acre of riparian shrub community types diamond fork siphon would cross two unnamed ephemeral drainages temporarily disturbing 0 012 0.12 012 12 acre of riparian shrub community type that would be restored under the SOPs construction of these crossings would have no significant wetland impacts about 275 feet of one unnamed ephemeral drainage would be filled and then reconstructed with a temporary loss of 0.06 006 acre of riparian shrub type about 260 feet of a second unnamed ephemeral drainage would be cut near the red mountain tunnel inlet portal and restored to original contour with a temporary loss of 0.06 006 acre of riparian shrub type both restored drainage ways would be planted with riparian shrubs 34641.4 346414 346414 diamond fork bridge the existing diamond fork bridge downstream of diamond fork siphon would be replaced with a new bridge after completion of construction the bridge would be replaced in its current location which is within a riparian shrub type community installation of the replacement bridge would 345 3 45 diamond fork system FSFEIS FS FEIS |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/10031 |
