Natomas Levee Improvement Program - SAFCA

3.8 Reach H (NEMDC between NEMDC Pump Station and Northgate Blvd)
Reach H extends for 23,700 feet along the NEMDC west levee between SAFCA’s NEMDC
Stormwater Pumping Station and Northgate Boulevard. SAFCA’s 200-year project in this reach
includes installing cutoff walls in several portions of the levee; constructing bank protection
improvements; relocating several water, gas and electrical lines through the levee; relocating a
small number of electrical utility poles and lines at the landside toe of the levee; and
reconstructing the bicycle trail on top of the levee. This work will be completed as part of the
USACE project.
3.8.1 Fish and Wildlife Facilities
The 200-year project in this reach will have relatively minor impacts on various fish and
wildlife habitats. Compensation for these impacts will be provided through construction
of fish and wildlife facilities in Reach H. SAFCA’s estimate of the cost of these facilities
reflects projected land acquisition; site preparation, planting and establishment costs; and
long-term management costs derived from estimates prepared by SAFCA’s landscape
management consultants. This land acquisition and site preparation costs include a 10
percent contingency.
The USACE estimate is significantly higher than SAFCA’s estimate and likely reflects
the much larger project footprint anticipated by USACE in this reach.
3.8.2 Levees and Floodwalls
SAFCA’s estimate for levee and floodwall construction in this reach includes costs for
waterside rock slope protection. The estimate is based on the design consultant’s opinion
of probable cost based on a 60 percent design and includes a 25 percent contingency.
The SAFCA estimate assumes that levee construction in this reach will require
approximately 0.1 million cubic yards of borrow material. This material will be obtained
from the Krumenacher borrow site. The cost of this borrow material is approximately
$0.3 million reflecting the cost of acquiring the right to take this material. The cost to
acquire the right to take this material for borrow includes a 10 percent contingency.
The USACE estimate for this work is almost three times higher than SAFCA’s estimate
including contingencies. This likely reflects the larger project footprint assumed in the
USACE estimate as well as differences in labor and materials costs, contractor mark-ups,
and other cost items.
3.8.3 Interior Drainage Pumping Plants
RD 1000’s Pumping Plant 8 and the City of Sacramento’s Pumping Station 102 located
along the NEMDC west levee in Reach H need to be reconstructed to accommodate the
levee improvements in this reach. The reconstruction will occur as part of the USACE
project. SAFCA’s estimate of the cost of this work reflects the design consultant’s
opinion of the probable cost based on a 60 percent design plus a 25 percent contingency.
The USACE estimate for this reconstruction work is slightly higher than SAFCA’s.
Given the enlarged footprint of the NED Plan in this reach, the basis for this difference is
unclear.
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