2.0 Alternatives Considered
In Imperial Beach, the beach replenishment berm would be built along approximately 3,470 feet (0.7 mile)
of beach, from Imperial Beach Boulevard to approximately 1,000 feet south of Encanto Avenue. This
receiver site footprint would be longer than proposed under Alternative 1 (Figure 2-14).
Borrow Sites
Under this alternative, the borrow site locations would remain as under Alternative 1, but the sand quantity
would change and the number of receiver sites would decrease. Figures 2-15 through 2-20 also illustrate
the dredge location and discharge plans as they apply to this alternative. As under Alternative 1, temporary
pipelines would carry replenishment material to the shoreline and then up and down the coast to the various
receiver sites. Also, borrow sites SO-9 and SO-6 may be eliminated and additional material removed from
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SO-7 instead. Table 2-5 summarizes pertinent characteristics of the borrow sites under this alternative.
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Table 2-5
Alternative 2 Borrow Site Characteristics
Approx. Surface Area
Volume of Sand to be
to be Dredged
Depth of Dredge
Water Depth
Borrow Sites
Dredged (in cy)
(in acres)
(in feet)
(in feet, MLLW)
SO-9(1)
627,000(2)
63
Max. 15
45 to 55
SO-7(3)
360,000
70
1 to 11
60 to 85
SO-6
104,000
29
3 to 4
60 to 80
788,000(2)
SO-5
127
Max. 6
50 to 80
MB-1
150,000
19
Max. 10
68 to 75
SS-1
180,000
22
Max. 7
40 to 53
(1)
With dredge area modified to provide a larger buffer between previously unmapped artificial reef areas,
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the dredge area would be reduced by approximately 25 percent. The borrow site may be eliminated during
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final design.
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(2)
Volume includes overfill factor (Moffatt & Nichol 2000c).
(3)
Possible expansion to 1.5 million cy with total surface area of 150 acres if SO-9 and SO-6 are eliminated.
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Depth of dredge would be maximum 15 feet.
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Alternative 2b
This alternative would be implemented at the same receiver sites and using the same borrow sites as
described for Alternative 2a; however, adherence to applicable, local noise ordinances would limit the
hours and number of days per week that beach replenishment could occur. The construction schedules
Regional Beach Sand Project EIR/EA
Page 2-51
99-69\SANDAG EIREA 3.4.wpd 7/17/00
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