Trinidad General Plan Legend Figure 7a: ESHAs and Open Space Within City Limits Stream ESHA Type Buffer Stream OS City Limits Wetland ESHA Wetland Type k e Buffer re C l il Estuarine and Marine Deepwater M Estuarine and Marine Wetland k e k e ee r Cr C l r l e Mi k 's r n a ha P a onn McC eek Cr ed m a n ® n U 1 inch equals 988 feet 0 500 1,000 Feet www.trinidad.ca.gov Map updated February 2010 Future revisions could affect land use designations Biological Report Area of Special Biological Significance Stormwater Improvement Project Trinidad, California Prepared for: City of Trinidad July 2018 018073 1 Reference: 018073 Biological Report Area of Special Significance Stormwater Improvement Project Trinidad, California Prepared for: City of Trinidad Prepared by: 1062 G Street, Suite I Arcata, CA 95521 707-822-5785 August 2018 QA/QC:TAP A:\2018\018073A-Trin-SW-NEPA\PUBS\Rpts\20180822-SWBioRpt-Final.docx Table of Contents Page List of Illustrations ................................................................................................................................................ ii Abbreviations and Acronyms .............................................................................................................................. iii 1.0 Introduction ............................................................................................................................................ 1 1.1 Project Location ......................................................................................................................... 2 1.2 Site Description .......................................................................................................................... 2 2.0 Methodology ........................................................................................................................................... 2 2.1 Literature Review ....................................................................................................................... 2 2.2 Field Observations and Studies .................................................................................................. 3 3.0 Environmental Setting ............................................................................................................................ 4 3.1 Vegetation Communities ........................................................................................................... 4 3.2 Wildlife Habitats ........................................................................................................................ 4 3.3 Wildlife Movement Corridors .................................................................................................... 4 3.4 Offsite Conditions ...................................................................................................................... 5 4.0 Special Status Biological Resources ........................................................................................................ 5 4.1 Special Status Plant Species ....................................................................................................... 6 4.2 Special Status Animal Species .................................................................................................... 8 4.2.1 Amphibians ................................................................................................................... 8 4.2.2 Birds .............................................................................................................................. 8 4.2.3 Insects ......................................................................................................................... 10 4.2.4 Mammals .................................................................................................................... 10 4.3 Special Status Natural Communities and Habitats .................................................................. 11 4.3.1 Natural Communities .................................................................................................. 11 4.3.2 Wetlands and Riparian Habitats ................................................................................. 11 5.0 Conclusions ........................................................................................................................................... 11 5.1 Special Plant Status Species ..................................................................................................... 11 5.2 Special Wildlife Status Species ................................................................................................. 11 5.3 Sensitive Natural Communities................................................................................................ 12 5.4 Nesting Birds ............................................................................................................................ 12 5.5 Impacts on Wildlife Movement ............................................................................................... 13 5.6 Wetlands and Riparian Habitats .............................................................................................. 13 6.0 Recommendations ................................................................................................................................ 13 7.0 References ............................................................................................................................................ 14 Appendices 1. Species Lists 2. Site Photographs 3. National Wetlands Inventory A:\2018\018073A-Trin-SW-NEPA\PUBS\Rpts\20180822-SWBioRpt-Final.docx i Table of Contents, Continued List of Illustrations Figures Follows Page 1. Project Location ......................................................................................................................... 1 2. Project Vicinity ........................................................................................................................... 1 3. Area of Potential Effect .............................................................................................................. 1 4. Zoning & Project Parcels ............................................................................................................ 1 A:\2018\018073A-Trin-SW-NEPA\PUBS\Rpts\20180822-SWBioRpt-Final.docx ii Abbreviations and Acronyms C Celsius ESU evolutionarily significant °F degrees Fahrenheit unit/species status ft feet FESA Federal Endangered Species Act m meters FP fully protected species status mi mile G1/S1 critically imperiled species heritage ppt parts per thousand rank sqft square feet G2/S2 imperiled species heritage rank G3/S3 vulnerable species heritage rank ACOE Army Corps of Engineers G4/S4 apparently secure species heritage APN Assessor’s Parcel Number rank BIOS Biogeographical Information and G5/S5 secure species heritage rank Observation System HDPE high-density polyethylene BMP Best Management Practice IPaC Information for Planning and C candidate species status Conservation CCH Consortium of California Herbaria MBTA Migratory Bird Treaty Act CCR California Code of Regulations NCDC National Climatic Data Center CDFW California Department of Fish and NOAA National Oceanic and Atmospheric Wildlife Administration CESA California Endangered Species Act NWI National Wetlands Inventory CFGC California Fish and Game Code OSD Official Soil Series Descriptions CFR Code of Federal Regulations PT proposed threatened species status CNDDB California Natural Diversity SSC species of special concern Database SWRCB State Water Resources Control CNPS California Native Plant Society Board CRPR California Rare Plant Rank T threatened species status CT candidate threatened species status U.S. United States D delisted species status USFS United States Forest Service DPS Northern California distinct USFWS United States Fish and Wildlife population segment/species status Service E endangered species status USGS United States Geological Survey ECOS USFWS’s Environmental VegCAMP Vegetation Classification and Conservation Online System Mapping Program EPA Environmental Protection Agency WL Watch list species status A:\2018\018073A-Trin-SW-NEPA\PUBS\Rpts\20180822-SWBioRpt-Final.docx iii 1.0 Introduction SHN has conducted literature reviews, site investigations, and a habitat assessment to determine biological resources present in relation to the City of Trinidad’s (the City) Area of Special Significance Stormwater Improvement Project (the Project) (Figures 1-4). This Biological Report has been prepared to evaluate the potential for special status biological resources within the project area, including habitat for special status species and natural communities. The proposed project includes decommissioning the existing stormwater outfall and replacing it with a system of localized stormwater treatment chambers and infiltration basins. The intent of the design is to treat and dispose of stormwater closer to the areas of stormwater generation, which allows for a more distributed network of stormwater infrastructure that can be tailored to the anticipated runoff volumes generated by the contributing sub-watersheds. In addition the proposed project includes infrastructure to provide pollutant removal and capture of stormwater runoff. The base design of each stormwater treatment and infiltration system includes a local network of stormdrain inlets, conveyance pipes, stormwater treatment chambers, and infiltration pipes, in addition to some minor improvements including valley gutters, curbs, and stormdrain