Natomas Levee Improvement Program - SAFCA

3.6 Reach F (NEMDC Between Sankey Road and Elverta Road)
Reach F extends for 24,935 feet along the Natomas East Main Drainage Canal (NEMDC) west
levee between Sankey Road and Elverta Road. SAFCA’s 200-year project in this reach includes
reconstructing the existing levee to create a wider crown and flatter landside slope; installing
cutoff walls in several portions of the levee; relocating several private irrigation and drainage
facilities; relocating electrical utility poles and lines; reconstructing the roadway on top of the
levee; raising the Riego Road bridge deck crossing the levee; and demolishing several rural
residential home sites and a commercial/agricultural structure in the footprint of the project. This
work will be completed as part of the USACE project.
3.6.1 Fish and Wildlife Facilities
The 200-year project in this reach will have significant impacts on cropland (primarily
rice) habitat. Compensation for these impacts is being provided primarily through
construction of managed marsh facilities on acquired lands in the Fisherman’s Lake area
in Reach B. SAFCA’s estimate of the cost of these facilities reflects actual land costs;
projected site development, planting and establishment costs based on engineering and
landscape design consultant estimates; and long-term management costs derived from
NBHCP models. The estimated land and site development costs include a 10 percent
contingency.
The USACE estimate does not include any costs for fish and wildlife facilities in this
reach. This is likely because these costs have been included in the estimate for this
account in other project reaches.
3.6.2 Levees and Floodwalls
SAFCA’s estimate for levee and floodwall construction in this reach is based on the
design consultant’s opinion of probable cost based on a 30 percent design and includes a
30 percent contingency.
The SAFCA estimate assumes that levee construction in this reach will require
approximately 0.6 million cubic yards of borrow material. This material will be obtained
from borrow sites in the triangle area east of the PGCC and the Krumenacher borrow site
along the NEMDC west levee near Elkhorn Boulevard. The cost of the borrow material is
approximately $3.7 million reflecting the cost of acquiring the Triangle properties and the
cost to take material from the Krumenacher borrow site that will serve as the sources. The
cost to acquire land for borrow includes a 10 percent contingency.
The USACE estimate for this work is over two times higher than SAFCA’s estimate
including contingencies. This may reflect differences in labor and materials costs,
contractor mark-ups, and other cost items.
3.6.3 Lands & Damages
Approximately 104 acres of rural residential and agricultural land is needed to
accommodate the 200-year project footprint in Reach F. SAFCA’s estimate of the cost of
this land reflects the range of the actual costs incurred for agricultural land elsewhere in
the Natomas Basin and includes a 10 percent contingency.
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