Ord 2625 - TMC Title 18 Chapters - Critical Areas Regulations

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nearest square foot and the site plan modified as necessary to incorporate the survey data. Exact wetland acreage will be calculated after the boundaries have been surveyed. Applicant must submit electronic survey data in Autocad, GIS or similar format at the time of as -built submittal. (2) Cowardin (Classification of Wetlands and Deepwater Habitats of the U.S. — U.S. Department of Interior) classification of the wetland(s). (3) Hydrogeomorphic classification of the wetland(s). (4) Hydroperiod. (5) Brief landscape assessment of the wetland (identify hydrologic basin/sub-basin; inlets, outlets; surrounding land use; habitat quality and connectivity; ultimate point of discharge; presence of culverts or other constraints to flow; relationship to other wetlands/watercourses adjacent to or potentially impacted by the proposed project). (6) Description of buffer size per this chapter, conditions (topographic considerations, existing vegetation types and density, habitat features, watercourse edges, presence of invasive species, etc.) and functions. (7) Assessment. For proposed wetland filling or proposed projects that will impact buffers, the most current Washington Wetland Classification System shall be used as a functional assessment. b. Characterization of the watercourses on site, adjacent to or potentially impacted by the proposed project must include: (1) Description of: flow regime, physical characteristics of streambed, banks, dimensions and bank -full width, stream gradient, stream and buffer vegetation conditions, habitat conditions, and existing modifications. (2) Brief landscape assessment of the watercourse (identify hydrologic basin/sub-basin, and contributing basin area acreage, outlets, surrounding land use, habitat quality and connectivity, ultimate point of discharge, presence of culverts or other constraints to flow, presence of man-made or natural barriers to fish passage, relationship to wetlands or other watercourses adjacent to or potentially impacted by the proposed project, flow regime). (3) Classification of the watercourse under Tukwila's rating system. (4) Description of buffer size per this chapter, conditions (topographic considerations, existing vegetation types and density, habitat features, watercourse edges, presence of invasive species, etc.) and functions. (5) Description of habitat conditions, wildlife/fish use of the watercourse, including sensitive, threatened or endangered species. c. Citation of any literature or other resources utilized in preparation of the report. 5. A statement specifying the accuracy of the study and assumptions used in the study. MLegislative Development\Critical Areas update 2-25-20 MD:bjs Review and analysis by Barbara Saxton Page 12 of 87