Environmental Impact Statement - Sonoma Land Trust

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California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.5. Biological Resources Table 3.5-3 Species Protection Windows (Note: The species protection windows may be modified by permits) Species California Clapper Rail and Black Rail Burrowing owls White-tailed kite, northern harrier, short-eared owl, tricolored blackbird, San Pablo song sparrow, and saltmarsh common yellowthroat or other nonspecial status migratory bird California red-legged frog Rearing juvenile salmonids and longfin smelt Species Protection Window Avoid construction in tidal marsh habitat during rail breeding season from February 1 through August 31 if present. No eviction from burrows. Restoration construction activities shall not be conducted during the breeding season (generally March 1 through September 1) for these species to the degree feasible to avoid removing or disturbing any active nests. Construction that commences in the dry season may continue into the rainy season if exclusion fencing is placed. Avoid grading activity within suitable aquatic and associated upland habitat (within 300 feet of aquatic habitat) between the onset of the rainy season (generally October 15, whichever occurs first) to May 1 unless exclusion fencing is utilized. Avoid construction activities that could affect tidal aquatic habitats (e.g., construction associated with lowering the perimeter levee and excavating tidal channels through the outboard salt marsh) during periods when special status fish could be present (typically August thru November) to the extent feasible. If hydraulic dredging is used to excavate the connector channel, a maximum 10-inch pump would be allowed, and salinity and temperature considerations would dictate dredge operations. A major assumption used in this analysis is that the predicted conditions of the restoration alternatives would actually develop within 50 years of implementation of the proposed expansion. These predictions are largely based on estimated rates of sediment accumulation, subsidence of dredged and other fill material, and colonization of plants, as well as predictions of the effects of wave action on plant colonization. and the rate of sea level rise. The actual rate at which nontidal and tidal wetland habitats would evolve and their distribution on the Project site is speculative because of uncertainties regarding the actual function and interaction of these parameters in tidal systems. Other assumptions used to conduct this analysis include the following. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.5-26 April 2012
California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.5. Biological Resources • Restored habitats and supporting hydrology are expected to stabilize under each of the restoration alternatives within 50 years of implementation of the proposed restoration. This assumption is based on the design criteria anticipating future conditions including sediment input levels and potential sea level rise scenarios. • All potential sources of surface and subsurface hazardous materials on the Project site will be removed or isolated before the selected restoration alternative is implemented. • All dredged material and other fill material used for construction will meet the criteria and standards established by the DMMO and other regulatory agencies with jurisdiction over the site. Impact Mechanisms The following types of activities associated with implementation of the restoration alternatives could result in loss of or disturbance to aquatic, wetland, and grassland habitats and associated species. • Creating a staging areas to provide temporary storage of topsoil, heavy equipment, fuel and supplies, and building demolition debris; • Excavating topsoil and removing it to a staging area; • Operating equipment and other construction activity, including constructing internal and perimeter levees and, trails, and roads; levee lowering; constructing internal and topographic features; grading,; and excavating channels and levee breaches; • Dredging Tolay Creek; • Placing dredged material for restoration of wetland habitat areas; • Reintroducing tidal flow to currently nontidal lands; • Installing drainage and other water-control infrastructure; • Performing management and maintenance activities necessary to maintain target habitats (e.g., activities associated with control of noxious weeds), maintain operation and integrity of infrastructure (e.g., water drainage and control structures), and control mosquito populations; • Colonization of invasive non-native vegetation species that displace or prevent establishment of native vegetation potentially lowering the habitat value of restored wetlands; and • Constructing, accessing, and using the Bay Trail and other trail segments. It should be noted that potential impacts related to methyl mercury are not discussed in this section, but are discussed in Section 3.3, Water Quality. Changes in methyl mercury availability could affect special-status wildlife species, such as California Clapper Rails; however the mechanism of impacts is Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.5-27 April 2012
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Sears Point Wetland and Watershed R
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Sears Point Wetland and Watershed R
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Contents List of Tables ...........
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California Department of Fish and G
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Executive Summary This summary prov
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Table ES-1. Summary of Impacts and
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Table ES-1. Continued Page 3 of 141
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Table 1-1. List of Local, State, an
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Table 2-2. Action Alternatives Cons
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Chapter 3 Affected Environment and
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Section 3.1 Geology, Soils, and Pal
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Section 3.2 Surface-Water Hydrology
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Section 3.3 Water Quality Introduct
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Section 3.12 Noise Introduction Thi
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Section 3.14 Aesthetics Introductio
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Section 3.15 Environmental Justice
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Chapter 4 Consultation and Other Re
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Sonoma Land Trust Chapter 4. Consul
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Chapter 5 Public Involvement and Sc
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Sonoma Land Trust Chapter 7. Refere
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Environmental Impact Statement - Sonoma Land Trust

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