EVEREST June, 2013 - California Department of Boating and ...

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Orange County Coastal Regional Sediment Management Plan 3.1.3 Nearshore Confined Disposal A nearshore confined disposal facility involves placing contaminated dredged materials inside a diked nearshore area or island constructed with containment and control measures such as lining, covering and effluent control. This disposal option has been employed by the Ports of Los Angeles and Long Beach for many years and has been the standard method for disposing of contaminated dredged sediments. 3.1.4 Confined Aquatic Disposal Confined aquatic disposal is a procedure where contaminated sediments are placed into a submerged mound or depression and covered with clean sediments to form a cap that will prevent upward migration of contaminants into the water column or surficial sediment layer. This option was successfully constructed for a pilot study in 2001, where material was placed near one of the oil islands off the coast of Long Beach (USACE, 2002c). 3.1.5 Nearshore Nourishment Placement of sediment in the nearshore environment, close to beaches, can restore beaches for recreational use and protect the shoreline from erosion. These nourishments should have grain sizes comparable to those of the native beach material, as well as being aesthetically compatible in color and texture with the native beach material. If deposited close enough to the beach, the placed sediment will gradually move onshore by waves and currents, thereby increasing the beach width. Where sediment is suitable, nearshore placement is a preferred method over the previously mentioned disposal options due to the indirect benefits to beaches. 3.1.6 Beach Nourishment Beach nourishment involves placing available sediment along eroded shorelines to replenish and widen beaches. Nourished material should have grain sizes comparable or slightly larger than those of the native material as well as aesthetically compatible in color and texture with the existing beach material. Where sediment is beach suitable, beach nourishment is a preferred placement method due to the direct benefits accrued by the beaches. 3.1.7 Upland Stream and River Placement Placement of sediment along a stream, creek, or river bank for purposes of downstream nourishment is a relatively uncommon attempt to replicate natural sediment transport processes around an existing dam or other sediment trap. Example projects that intend to utilize this method are the Santa Anita Reservoir Sediment Removal Project (Los Angeles County Department of Public Works, 2007) and the Prado Basin Sediment Management Demonstration Project (Orange County Water District, 2011 and Appendix D). Where sediment is suitable, Everest International Consultants, Inc. 3.2
Orange County Coastal Regional Sediment Management Plan stream and river placement is a preferred mechanism due to the indirect benefits accrued by the beaches. 3.1.8 Coastal Receiver Sites The preferred coastal receiver sites are explicitly listed because of their known need for nourishment. These sites are beach or nearshore locations that have received sand in the past, have been identified in previous work as in need, or are listed as Beach Erosion Concern Areas (BECAs) by the California CSMW (2010). These coastal receiver sites are listed in the order of geographic location from west to east in Table 3.1, and marked in Figure 3.1 using the beach tracking numbers previously developed in Table 2.4. The receiver sites were prioritized based on need, hence the most eroded beaches with the highest recreational use and the greatest potential for storm damage have a high need and the widest beaches with lowest recreational use and lowest potential for storm damage have a low need. These needs were determined in consultation with Orange County and USACE. Additional details on each receiver site can be found in the references listed in Table 3.1. Everest International Consultants, Inc. 3.3
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EVEREST June, 2013 - California Department of Boating and ...

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