5.0 Cumulative Projects and Impacts
Potential cumulative projects for both project receiver and borrow sites are identified in Table 5-1. The
table identifies the project name, the jurisdiction within which the action will occur, a brief description and
the anticipated schedule. As noted, some projects will occur annually. Other pertinent, recently completed
beach nourishment projects are included as well, although this is not intended to be an exhaustive list of all
historical beach nourishment projects in the San Diego region. In fact, as described in Section 4.8, there
were over 35 major beach replenishment projects between Oceanside and Carlsbad between 1954 and
1988. Between 1981 and 1996, 18 replenishment projects placed more than 10.5 million cy in the same
area (Coastal Environments 1998).
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As described in Section 1.1.1, SANDAG has prepared a Shoreline Preservation Strategy to address
concerns about shoreline erosion along the San Diego region coastline. That document has a menu of
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possible solutions including beach replenishment, construction of retention structures such as groins,
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construction of property protection structures such as sea walls, and policies to regulate beach and bluff
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development such as building set-backs and irrigation control. At present, the Shoreline Preservation
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Strategy is a strategic planning document with no authority for implementation, no list of specific projects,
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no identified locations for features such as groins, berm, sea walls, and extremely limited funding for the
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estimated 0 million cost (beach building component only). As also noted in Sections 1.1.1 and 2.1.4,
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the .3 million dollar budget for the RBSP project is one-time-only funding and the local assessment to
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fund coastal monitoring is approximately ,000. Therefore, the Shoreline Preservation Strategy is not
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considered a "reasonably foreseeable project."
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5.2
ANALYSIS OF CUMULATIVE IMPACTS
Geology and Soils
5.2.1
The three littoral cells along the coast of the San Diego region have been experiencing a reduction of natural
sand sources for beach replenishment and the beaches fed by this process have been eroding over time.
Implementation of the proposed replenishment action would therefore be a beneficial impact and would
cumulatively contribute to the reduction of erosion at the identified beach sites. Over the long term, only
relatively minor increases in the thickness of sand on the beaches and offshore bars are anticipated, similar
to changes in thickness that should naturally occur seasonally. Past beach replenishment projects have
occurred in similar locations and have not changed the littoral processes off the coast. The projects listed
in Table 5-1 would not affect the transport of sediment off the coast, although they would provide
additionalsand sources to sustain the littoral cells. Therefore, implementation of the proposed action would
be a cumulatively beneficial impact to geology and soils.
Page 5-2
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