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Smith Island/Union Slough Habitat Restoration Project City of Everett Public Works, Heather Griffin (425) 257-7206 Page 1 Site location and description: The site is located on Smith Island and is bounded to the south by 4th Street SE, to the west by the City wastewater treatment Oxidation Pond, to the north by a setback dike and to the east by Union Slough. Tidal waters were restored to the site in October 2007 creating a 57.9 acre advanced wetland mitigation site. The projects below describe the use of mitigation from the 57.9 acre site. Debit Project Debit Project Location Brief Description of Impacts Compensated by Mitigation Credits (Type of impact, wetland rating, etc.) Impact Acreage Comments Mitigation Site Phase and Performance Standard(s) Corps of Engineers Permit No. and Date Credits (in acres) Withdrawn per US Corps of Engineers Remaining Balance of Acres (per Corps) Washington State Department of Ecology Permit No. and Date Credits (in acres) Withdrawn per WA Dept of Ecology Remaining Balance of Acres (per Ecology) Dike Improvements Union Slough and Snohomish River south of 12th Street NE on Smith Island Fill of freshwater wetlands in the following types and amount: PEM=4.81; PSS=2.14; PFO=1.28. Conversion of freshwater wetlands. Dike improvement impacts = 8.23 acres; freshwater wetland conversion = 55.8 acres 13.1 acres mitigation for dike improvement impacts; 7.9 acres mitigation for conversion of freshwater wetlands to intertidal wetlands Creation of 57.9 acre mitigation site along with concurrent impacts NWS-1999- 00221 2/7/2003 21 36.9 Order # 02SEANR- 4717 12/10/2003 21 36.9 1996 and 1998 Dike Maintenance Projects South Smith Island Fill of freshwater wetlands in the following types and amount: PEM=0.113; PEM=0.304 0.417 Retroactively applied per Advanced Mitigation Agreement at 1.25 acres mitigation per acre of impact Creation of Mitigation Site NA 0 36.9 2003 Advanced Mitigation Agreement between the City and Ecology 0.52 36.38 2012 Water Pollution Control Facility Upgrades Southwest of Existing Water Pollution Control Facility Fill of freshwater wetlands in the following types and amount: PFO=0.34; PSS=0.26 0.6 Ecology mitigation ratios: PFO=2.135; PSS=1.175 per Advanced Mitigation Agreeement. Corps cites lag of function and requires 3:1 ratio Year 3 of mitigation site; 21+ acres intertidal marsh present NWS-2010- 1316 10/13/2011 1.8 35.1 Order # 8542 6/6/2011 1.03 35.35 2012 Union Slough Levee Rehabilitation Project Snohomish River south of 4th St SE and Union Slough east of I-5 0.72 acre of wetland and intertidal habitat impacts 0.72 Corps project. No permit was issued by the Corps, however the Corps concurred with the 401 mitigation ratio Year 5 of mitigation site PM-ER-12-7 1.45 33.65 Order # 9321 7/23/2012 1.45 33.9 2018 Snohomish Diking District 5, Union Slough Levee Repair Project Union Slough near I-5, Snohomish River SW of Water Pollution Control Facility 0.32 acre of Category II Estuarine Wetlands 0.32 Corps Section 404 #PMP-18-16. After acceptance of Year 10 Monitoring and Closure of Permit PMP-18-16 0.32 33.33 Functionally Analogous to Nationwide Permit #3 PMP- 18-16 0.32 33.58