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Estero Americano Creek Bridge Replacement

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Estero Americano Creek Bridge Replacement Estero Americano Creek Bridge Replacement Wetland and Riparian Habitat Mitigation and Monitoring Plan State Route 1 Marin and Sonoma Counties, California 04-SON-1 PM 17.3/21.8 EA 20950 May 2016 For individuals with sensory disabilities, this document can be available in Braille, large print, on audiocassette, or computer disk. To obtain a copy in one of these alternate formats, please call or write to Caltrans, Attn: Greg Pera, Office of Biological Sciences and Permits, 111 Grand Avenue, Oakland, CA 94623-0660; (510) 286-5617 Voice, or use the California Relay Service TTY number, (800) 735- 2929. Estero Americano Creek Bridge Replacement Habitat Mitigation and Monitoring Plan 1.1 Contents Chapter 1 Introduction to Project Requiring Mitigation .................................................. 1 1.1 Proposed Mitigation ................................................................................................ 1 1.2 Location .................................................................................................................. 1 1.3 Project Description .................................................................................................. 2 1.4 Environmental Setting ............................................................................................ 5 1.4.1 Aquatic Functions ............................................................................................... 6 1.4.2 Habitat Types ..................................................................................................... 7 1.4.3 Hydrology and Topography ............................................................................... 7 1.4.4 Soils and Substrate ............................................................................................. 7 1.4.5 Vegetation .......................................................................................................... 8 1.4.6 Threatened and Endangered Species .................................................................. 9 1.5 Project Impacts that Require Mitigation ................................................................. 9 1.5.1 California Department of Fish and Wildlife Jurisdictional Impacts ................. 10 1.5.2 California Coastal Commission Jurisdictional Impacts .................................... 11 1.5.3 North Coast Region Water Quality Control Board Jurisdictional Impacts ...... 11 Chapter 2 Mitigation Project .......................................................................................... 12 2.1 Objective of Proposed Mitigation ......................................................................... 12 2.1.1 Riparian Trees .................................................................................................. 13 2.1.2 Wetlands and U.S. Waters ................................................................................ 13 2.2 Mitigation Site Selection ....................................................................................... 13 2.3 Mitigation Site Protection Instruments ................................................................. 14 2.4 Baseline Information at Mitigation Sites .............................................................. 14 2.5 Mitigation Habitat Restoration and Establishment ............................................... 16 2.5.1 Plant Installation Methods ................................................................................ 18 2.5.2 Irrigation ........................................................................................................... 19 2.5.3 Weed Control ................................................................................................... 19 Chapter 3 Performance Standards and Management Plan .............................................. 20 3.1 Success Criteria ..................................................................................................... 20 3.1.1 Minimum Vegetatation Cover .......................................................................... 20 3.1.2 Surface Area of Wetland and Riparian Tree Mitigation ................................... 20 3.1.3 Soil Stability ..................................................................................................... 21 3.1.4 Hydric Soil Indicators ...................................................................................... 21 3.2 Monitoring and Reporting ..................................................................................... 21 3.3 Offsite Long-term and Adaptive Management Plan ............................................. 23 3.4 Financial Assurances ............................................................................................ 23 Appendix Appendix A Figures Appendix B Project Site Photos Appendix C Mitigation and Planting Plans Estero Americano Creek Bridge Replacement Habitat Mitigation and Monitoring Plan List of Abbreviated Terms Caltrans California Department of Transportation CEQA California Environmental Qualtiy Act CDFW California Department of Fish & Wildlife CNDDB California Natural Diversity Database ESA environmentally sensitive areas ft foot LSAA Lake and Streambed Alteration Agreement PM post mile RCD Resource Conservation District RE Resident Engineer sq square SR State Route USFWS U.S. Fish and Wildlife Service NCRWQCB North Coast Regional Water Quality Control Board Estero Americano Creek Bridge Replacement Habitat Mitigation and Monitoring Plan Introduction to Project Requiring Mitigation Chapter 1 Introduction to Project Requiring Mitigation 1.1 Proposed Mitigation This Habitat Mitigation and Monitoring Plan (HMMP) has been prepared for the California Department of Fish and Wildlife (CDFW), California Coastal Commission (CCC), United States Army Corps of Engineers (USACE), and the North Coast Regional Water Quality Control Board (NCRWQCB), per the conditions of the Lake and Streambed Alteration Agreement, Coastal Development Permit, 404 Wetlands Permit, and Water Quality Certification. It presents the compensatory mitigation for the loss of wetlands and riparian habitat, including impacts to state waters, incurred by the Estero Americano Creek bridge- replacement project on State Route (SR) 1 in Marin and Sonoma Counties, California. The Estero Americano Creek bridge replacement project (described in Section 1.3) will be mitigated both onsite and offsite: (1) onsite at the bridge project site within the Caltrans Right of Way (ROW) and (2) offsite at the Estero Americano Coastal Preserve. This mitigation and monitoring plan provides details for the wetland creation and riparian replacement planting to be installed onsite at the project location described above and prelimary plans for offsite mitigation at the Estero Americano Coastal Preserve. The goal of the proposed mitigation is to restore riparian tree and wetland habitats in areas of temporary impact and establish wetland habitat in areas adjacent to permanently impacted wetlands lost resulting from the bridge replacement with comparable habitat. The mitigation is expected to provide equivalent or better functional values for wildlife compared to the existing site conditions and is to be restored and enhanced with the goal of establishing quickly and being self-sustaining after the three-year plant establishment period. 1.2 Location The Estero Americano Bridge Replacement Project is located in an unincorporated area on the Marin County and Sonoma County line about 1.5 miles east of Valley Ford on SR 1. The project limits stretch from post mile (PM) 50.1 to 50.5 in Marin County and from PM 0.0 to 0.1 in Sonoma County. The project limits lie entirely in the Valley Ford U.S. Geological Survey (USGS) 7.5-minute topographic quadrangle, and within the Americano Creek watershed. The proximity of Americano Creek to the Estero Americano estuary results in the stretch through the proposed project being refered to as Estero Americano Creek. Figure 1 depicts the regional vicinity of the project location and Figure 2 shows the exact location and vicinity of the project. Estero Americano Creek Bridge Replacement Habitat Mitigation and Monitoring Plan 1 1.3 Project Description The bridge over Estero Americano Creek was originally constructed in 1925 and is at the end of its service life. The roadway and bridge flood periodically in the winter during storm events because of silt aggradation in the creek channel and the low elevation of the road relative to the landscape. Caltrans proposes to replace the existing 146-foot-long, 24-foot- wide bridge with a 266 feet long and 40 feet wide bridge that will be constructed slightly east of the existing alignment. The roadway will also be widened and shifted slightly through the project limits in order to conform to the new bridge. The existing roadway consists of 10- to 11-foot lanes with 0- to 1-foot shoulders. Caltrans proposes to construct 12-foot lanes with 6- foot shoulders with retaining walls extending away from the creek at the ends of all four bridge abutment corners for distances between 100 feet (from the northwest corner of the bridge) and 575 feet (from the southwest corner). Metal beam guard railing will be mounted on the retaining walls. The roadway approaches and bridge will be elevated above the surrounding landscape. Roadway embankments with 2:1 side slopes will be constructed along the remainder of the roadway from the ends of the retaining walls to the project limits. Components of the project are shown in Figure 3. The new, longer bridge will ameliorate flooding at the project location and create
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