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Sand Dike along the Back of Beach
Sand could also be placed as a dike along back of the beach if appropriate. The sand dike
concept could be constructed if BEACON chose to apply the sand to the sea more
gradually than would otherwise occur to reduce turbidity or if the County desires to use
the material to create a winter dike at this site. The material would be piled up along the
back portion of the beach. The dike would be narrower and longer than the beach berm
concept. A typical dike would reach up to +15 feet MLLW, be only 20 to 30 feet wide,
and slope more steeply to the beach at approximately 5:1 (H:V).
This design scenario could be useful if material is high in fines content and the turbidity
needs to be more controlled. Instead of transporting material to a stockpile site to wait
until such a time that turbidity is less of an issue, the material could be placed as a sand
dike along the back of the beach where it would disperse in the water more slowly during
extreme high tides. This design scenario could make beach placement feasible without
the high cost of double handling to a stockpile site and back to the beach.
Timing and Placement Rate
Placement at Goleta Beach is limited to Fall-Winter placement only (i.e., between September 15
and March 15). The high-use of this beach site during the summer months by beach goers
prohibits beach fill placement and construction during this time. The rate of sand placement is
derived from many factors including environmental factors, truck access, and seasonal
conditions. Table 3.1 outlines the yearly placement limits for each site.
The Ash Avenue beach fill site is located in the City of Carpinteria. Carpinteria is located in
Santa Barbara County (Figure 3-4), south of the City of Santa Barbara. Ash, Holly, Elm, and
Linden Avenues provide beach access to the Carpinteria City Beach. A concessionaire who rents
kayaks and other beach related items is located at the Ash Avenue access point. Recreational
activities at Ash Avenue beach fill site include swimming, sunbathing, surfing, kayaking, scuba
diving, and fishing. The Ash Avenue beach fill site is bordered by Carpinteria State Beach to the
east, the Pacific Ocean to the south, residential homes to the north and west, and the Carpinteria
Marsh inlet to the far west. During wet weather episodes, the Marsh discharges into the Pacific
Ocean and contributes sediment to the littoral system.
Proposed Quantity and Quality of Beach Fill Material
The plan view of the proposed Ash Avenue beach fill is shown in Figure 3-5. The plan shows a
beach fill beginning approximately 1,000 feet south of the Carpinteria Marsh inlet and extending
approximately 2,400 feet south to Linden Avenue. The maximum annual volume of material
proposed for this site is approximately 100,000 cy. Also, the beach fill is positioned 1,000 feet
south of the Carpinteria Marsh inlet to minimize potential impacts to the Carpinteria Reef located
just offshore of the marsh inlet if material moved offshore as the beach profile adjusts towards
Moffatt & Nichol Engineers


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