2.0 Alternatives Considered
approximately 150 feet at a slope of 10:1. The receiver site extends from just north of 27th Street to
R
Powerhouse Park, a distance of approximately 3,110 feet (0.6 mile). This footprint is slightly longer and
R
wider than the footprint evaluated in the Draft EIR/EA, but there would be no difference in impact
R
conclusions (refer to Appendix F).
R
The beach replenishment berm at the Torrey Pines site (Figure 2-12) would be constructed to an elevation
of approximately 11 feet above MLLW, and would extend for approximately 1,620 feet (0.3 mile). The
berm would be flat with a width of approximately 300 feet. The beach fill would then slope seaward
approximately 200 feet at a slope of 10:1.
The Mission Beach receiver site would be constructed to create a berm of approximately 10 feet above
MLLW and approximately 150 feet wide, stretching approximately 1,590 feet (0.3 mile) from Nantasket
Court to Santa Barbara Place (Figure 2-13). The beach fill would then slope seaward at a slope of 20:1.
The width of the slope would be approximately 125 feet at the northern end and 250 feet to the south,
where the underwater slope is more gradual.
In Imperial Beach, the beach replenishment berm would be built to approximately 10 feet above MLLW
and would be approximately 120 feet wide, stretching from just Admiralty Way to approximately 600 feet
south of Encanto Avenue (Figure 2-14). The total length would be approximately 2,310 feet (0.4 mile).
The beach fill would then slope seaward approximately 125 feet at a slope of 20:1.
Borrow Sites
The six borrow sites would be located offshore along the coast from Oceanside to Imperial Beach, in
relative proximity to each receiver site but far enough offshore to be outside the littoral cell depth of closure.
The term borrow site refers to a larger location that has been investigated as part of this project in terms
of sediment characteristics, marine resources, ocean surface, etc. Within that large area, a smaller dredge
area has been identified where the actual material would be removed. The impact analyses evaluate the
direct impacts of activity in the smaller dredge area, but the term "borrow site" is used when discussing this
project feature as a category, i.e., instead of receiver sites. Where a further distinction is necessary, it is
noted in the analysis. Table 2-3 provides a summary of borrow site characteristics including the volume
of material to be dredged, the surface area affected, the depth of dredge, and the water depth.
Figures 2-15 through 2-20 illustrate the dredge location and discharge plan for each of the six borrow sites.
As shown, temporary pipelines to carry replenishment material would be constructed to the shoreline and
then material would be pumped up and down the coast, as necessary, to various receiver sites.
Page 2-28
Regional Beach Sand Project EIR/EA
99-69\SANDAG EIREA 3.4.wpd 7/17/00
Previous Page
