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

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Orange County Coastal Regional Sediment Management Plan • Federal and state endangered California least tern (Sterna antillarum browni); • Federal threatened western snowy plover (Chardrius alexandrinus nivosus) and critical habitat; • Federal endangered Southern California Steelhead (Oncorhynchus mykiss) evolutionary significant unit and critical habitat (“evolutionary significant unit” is a term developed by NOAA Fisheries (NMFS, 2012a) to describe distinct population segments of salmon under the endangered species act); • Federal endangered green sea turtle (Chelonia mydas); • Fully protected marine mammals such as California gray whale (Eschrichtius robustus) and protected dolphins, porpoises, seals and sea lions (Fully Protected is a designation used by the CDFG); • Fully protected California brown pelican (Pelecanus occidentalis californicus); • California grunion (Leuresthes tenuis) spawning beaches; • Pismo clam (Tivela stultorum), if within persistent clam bed areas; and • Olympia oyster (Ostrea lurida), if within persistent oyster bed areas. Table 3.7 summarizes the regional distribution of coastal habitats in Orange County. The locations of many of these habitats in the vicinity of potential RSM areas are shown on Figures 3.5 through 3.9. Figures 3.5 through 3.9 show locations of hard-bottom, canopy kelp, seagrasses, bays and estuaries (including harbors), man-made hard-bottom structures, selected managed species, and RSM locations. The figures are intended to show the types of habitats and resources generally considered with coastal RSM projects involving beach nourishment, and include locations of receiver sites and sediment sources identified in Sections 3.1 and 3.2 of this report. The identified USACE sites include dredge and receiver areas that have been historically used within the region. The figure legends list a portion of the types of data in the project geographic information system (GIS). Individual figures show the available mapped data for different reaches of the study area where RSM activities have or may occur. The tan colored polygon called hard substrate includes bedrock and cobble; sand is the dominant habitat type offshore and generally may be assumed in areas where hard-bottom is not shown. Some nearshore bedrock areas and embayment soft-bottom areas include vegetated habitats. Everest International Consultants, Inc. 3.24
Orange County Coastal Regional Sediment Management Plan Table 3.7 Regional Distribution of Coastal Habitats in Orange County HABITATS Sandy Beach Soft-bottom Subtidal Nearshore Reefs/ Rocks Surfgrass Beds Eelgrass Meadows Kelp Forests/Beds Creeks/Rivers Bays/Harbors Other Wetlands RELATIVE OCCURRENCE Majority of shoreline Majority of subtidal Localized areas Localized areas on hard-bottom Localized in embayments Localized areas on hard-bottom Five Four Six Most shorelines Nearshore, embayments OCCURRENCE IN ORANGE COUNTY Huntington Cliffs, Newport Beach, Laguna Beach, Crystal Cove, Dana Point, San Clemente Corona Del Mar State Beach, Laguna Beach, Dana Point, San Clemente Anaheim Bay, Seal Beach National Wildlife Refuge, Huntington Harbour, Bolsa Chica Ecological Reserve, Huntington Beach Wetlands, Lower Newport Bay, Dana Point Harbor Newport Beach, Laguna Beach, Dana Point, San Clemente San Gabriel River, Santa Ana River, Aliso Creek, San Juan Creek, San Mateo Creek Anaheim Bay, Huntington Harbour, Newport Bay, Dana Point Harbor Los Cerritos Wetlands, Seal Beach National Wildlife Refuge, Bolsa Chica Ecological Reserve, Huntington Beach Wetlands, Newport Banning Ranch, Upper Newport Ecological Reserve Vegetation data are distinguished according to dominant vegetation type (i.e., kelp, understory algae, seagrass). Kelp canopy and understory algae map layers may overlap and vary by year depending on environmental conditions. The multiple years of kelp coverage from 1967 through 2008 are combined into a simple kelp feature (orange color). This kelp and the understory algae records provide a good indication of locations with hard-bottom vegetated HAPC, which may or may not have surface kelp canopies. Mapped seagrasses include surfgrass (1980 - 2009) on nearshore hard-bottom or eelgrass (2003) on soft-bottom embayment habitats. Available seagrass (2003) data are not exact, but rather show areas within which eelgrass (e.g., Alamitos Bay) or surfgrass may occur (e.g., nearshore area off San Clemente, nearshore area from Corona del Mar to Dana Point). Some areas where eelgrass may occur are not mapped because of unavailable GIS data (e.g., Anaheim Bay, Huntington Harbour, Bolsa Chica Ecological Reserve). Managed species shown on the figures include California least tern, western snowy plover, and California grunion, which are particularly relevant to beach nourishment. Least tern and/or snowy plover nesting sites and potential over-wintering areas for snowy plover and federallydesignated critical habitat for snowy plover are based on resource agency publications and monitoring records. Beach locations where grunion spawning records have been compiled are Everest International Consultants, Inc. 3.25
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