Executive Summary
volume of material to be dredged, the surface area affected, the depth of dredge, and the water depth.
Subsequent to the issuance of the Draft EIR/EA, engineers have recommended decreasing the dredge area
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or eliminating borrow sites SO-9 and SO-6. Additional material may be removed from SO-7 instead.
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This modification would not change any significance conclusion in the Final EIR/EA.
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Table ES-4
Alternative 1 Borrow Site Characteristics
Approx. Surface
Volume of Sand to
Area to be Dredged
Depth of Dredge
Water Depth
Borrow Sites
be Dredged (in cy)
(in acres)
(in feet)
(in feet, MLLW)
SO-9(1)
706,000(2)
63
Max. 15
45 to 55
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SO-7(3)
496,000
70
1 to 11
60 to 85
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SO-6
104,000
29
3 to 4
60 to 80
656,000(2)
SO-5
127
Max. 6
50 to 80
MB-1
100,000
19
Max. 6
68 to 75
SS-1
120,000
22
Max. 6
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
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during final design.
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(2)
Volume includes overfill factor (Moffatt & Nichol 2000c).
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(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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Maximum depth of dredge would be 15 feet.
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Alternative 1b
Under Alternative 1b, the proposed action would be implemented at the same receiver sites using the same
borrow sites as described for Alternative 1a; however, adherence to applicable noise ordinances would
limit the hours and number of days per week that beach replenishment could occur. Table ES-3 identifies
which receiver sites would be subject to local noise ordinances and provides a comparison of the schedule
and production capability under either construction variation. As shown, the overall quantity of sand would
be 1.3 million cy under Alternative 1b versus 2 million cubic yards under Alternative 1a.
Alternative 2
Alternative 2 would involve sand replenishment at nine beach receiver sites, all but one of which would be
associated with Alternative 1. The same six borrow sites would provide the material for replenishment and
the dredging and discharge plan would be the same, except where some receiver sites would be eliminated.
Individual receiver sites are described below as they would vary from Alternative 1.
Page ES-12
Regional Beach Sand Project EIR/EA
99-69\SANDAG EIREA es.wpd 7/17/00
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