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

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Orange County Coastal Regional Sediment Management Plan Sand and Gravel Mining By some estimates, the primary cause of sediment deficits in California beaches is not dams but sand and gravel mining (Magoon et. al., 2005; Richmond et. al., 2007), with southern California losses averaging an estimated 20 million yd 3 /year (Kent et. al., 2005). There are dozens of legal sand mining operations within 50 miles of the Orange County coast and most of these operate by removing sand and aggregate from existing stream beds or immediately adjacent to them. A few examples of quarries that mine sand within this region are listed in Table 3.4. This list includes only a small fraction of the many sand mines in the Plan area. While this mining is controlled by the U.S. Bureau of Land Management, California Department of Conservation, and the CSLC and mineral extraction fees are paid, neither the sand nor mining fees are currently applied to offset sand loss at the coast. Table 3.4 Samples of Sand and Gravel Mines Within the Plan Area NAME LOCATION COUNTY Rancho Mission Viejo Sand & Gravel Mine Trabuco Creek, San Juan Capistrano Orange Carmeus Industrial Sands Santa Ana R., Riverside Riverside Ewles Materials San Juan Creek, San Juan Capistrano Orange Cemex Corona Riverside Ortega Rock Quarry Mission Viejo Sand Plant San Juan Creek, San Juan Capistrano San Juan Creek, San Juan Capistrano Orange Orange Crestline Quarry San Juan Capistrano Orange San Juan Creek Dana Point Orange Blue Light Mine Silverado Orange Orange Quarry Placentia Orange Corona Quarries Corona Riverside Hanson Aggregates Corona Riverside All-American Asphalts Corona Riverside Riverside Cement Company Corona Riverside Everest International Consultants, Inc. 3.12
Orange County Coastal Regional Sediment Management Plan 3.2.2 Coastal and Offshore Sediment Sources Potential coastal and offshore sediment sources include traditional nearshore sources just offshore of the active littoral zone, harbor and marina maintenance dredging projects, wetland restoration and maintenance dredging projects, and river maintenance dredging projects. The coastal and offshore sediment sources from west to east are listed in Table 3.5 and shown in Figure 3.4. Details on existing sediment volumes, grain sizes, and replenishment rates can be found in the associated references and the CSMW GIS database. Some offshore sediment sources have names designated by USACE (e.g., ORA-1) and their physical properties are well documented. Others, such as the deposition just outside of Dana Point Harbor have not been investigated in detail. The three harbors within the Plan area are Huntington Harbour, Newport Harbor, and Dana Point Harbor, all with varying sedimentation rates and grain size characteristics. In addition to the harbors, there are numerous tidally influenced estuaries and lagoons, including the San Gabriel River Estuary, the Bolsa Chica Ecological Reserve, the Huntington Beach Wetlands (including Talbert Marsh), the Santa Ana River Estuary, the Newport Banning Ranch Wetlands (including Semeniuk Slough), and the Upper Newport Bay. Beaches sometimes serve as coastal sediment sources where bypassing or backpassing occurs. Examples within Orange County are West Newport Beach and the Balboa Peninsula. Both are wide throughout the year, tend to accrete over the long-term, have beach compatible sand, and are located near other beaches that are in need of sand. Almost all of these coastal sediment sources have been dredged in the past with the overwhelming majority of material being placed either offshore, nearshore, or on beaches. Most of these sources have dredging programs in place or planned for the near-term. Everest International Consultants, Inc. 3.13
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EVEREST June, 2013 - California Department of Boating and ...

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