Environmental Impact Statement - Sonoma Land Trust

California Department of Fish and Game
U.S. Fish and Wildlife Service
Chapter 2. Alternatives
beams, and pre-cast deck sections, all manufactured off-site and hauled to the
site by on-highway trucks. The construction sequence would include
removing the existing rails, ties, and ballast; stockpiling those materials onsite,
and construction and use of a temporary bypass line; constructing the
improved levee and bridge; and then returning the ballast, ties and rails.
Some additional ballast and replacement ties may be needed.
Construction equipment typically would include excavators, dozers, off-road haul
trucks, a large tracked cable crane to drive support piles and set pre-cast culvert
sections, a pile driving hammer, front end loaders, and other railroad specific
equipment for placing and grading ballast, ties, and rails. The on-highway
equipment would include concrete trucks and large delivery trucks. The
feasibility of hauling some of the construction material by rail will be evaluated
as part of the final design.
Flood Protection Levee along Reclamation Road
To prevent inundation of this road during high tide events, a smaller flood control
levee with an elevation +12 feet NAVD and a length of approximately 2,000
linear feet would be constructed along Reclamation Road. The basic design of
the levee would be similar to that described for the Project; however, the west
slope of the levee (facing Reclamation Road) would only have a toegeotechnical
stability berm.
Flood Protection Levee along Highway 37
In order to protect the low areas of this highway from inundation during high tide
events, a major flood control levee would need to be constructed south of
Highway 37. Similar to the levee along the SMART tracks, this levee would have
a design crest elevation of +12 feet NAVD and a length of approximately
3,900 linear feet from Reclamation Road to connect into the higher existing
ground elevations to the east. This levee would have an approximately 12 to 16
foot top width to allow for levee maintenance and an alternative access road to
the USFWS headquarters. Thus, the basic design of the levee would be similar to
that described for the Project; however, the north slope of the levee (facing
Highway 37) would only have a toegeotechnical stability berm.
Lowering of the Existing OutboardPerimeter Levee
The existing outboardperimeter levee would be lowered to between MHHW and
1 foot above MHHW, as described for the Project.
Levee Breaches
The breaches would be designed as described for the Project.
Sears Point Wetland and Watershed Restoration
Project Final Environmental Impact
Report/Environmental Impact Statement
2-36
April 2012