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 City of Solana Beach
Shoreline and Coastal Bluff Management Strategies Draft MEIR
Summary
Table S-1 (continued)
Summary of Environmental Impacts and Mitigation Measures
II. Significant Environmental Impacts That Can Be Avoided or Mitigated (Section 151 26[c]
of the State CEQA Guidelines) (Continued)
Geology and Soils (Continued)
Alternatives 1 and 2
Erosion of Tidal Terrace
Mitigation for the lack of a tidal terrace can be
(Continued)
provided by sand replenishment (see above).
It should be noted, however, that even prior to
the recent beach replenishment, only a limited
area of the coast had the tidal terrace exposed
and almost the entire beach was covered by
sand.
End Scour
End scour would most likely be mitigated by
construction of an additional protective seawall
or riprap revetment at the end of the subject
seawall, or by a combination of sand
replenishment and/or groin system.
Alternative 3
Artificial sand retention devices such as
Mitigation measures to offset the impoundment
breakwaters and reefs would impound
of sand behind breakwaters and reefs would
sand behind the structure. Groin fields
include pre-filling the area behind the retention
could cause potential downcoast erosion.
structure (salient volume) with sand imported
from outside of the littoral system. Pre-filling
the groin field, extending sand bypassing,
regular beach monitoring, and possible sand
replenishment would mitigate downcoast
erosion caused by groin fields.
Alternative 4
Differential Erosion
To mitigate differential erosion along the
beach, existing protective devices (seawalls,
riprap, seacave in-fills, notch in-fills, etc.)
should be removed and natural erosion
allowed to occur, if permissible under state law.
As these devices are removed, blockfalls,
landslides, and/or areas of accelerated erosion
may occur. Safe buffer zones should be
established at the base of the seacliff for public
safety. Additionally, the coastal bluff stability
should be evaluated and mitigative measures
implemented to increase static and dynamic
slope stability, if necessary. These measures
may include "flattening" or decreasing the
slope inclination (angle) of the upper and lower
bluff to make the slope more stable. Structures
and utilities at and for a distance landward from
the top of the bluff should be removed so that
bluff retreat does not cause a safety hazard
when the bluff (and the improvements
supported by the bluffs) fails.
Project No. 323530000
Page S-9
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