Wetland Jurisdictional Size Comparisons Multiple Jurisdictions Jurisdiction Name (Year Jurisdictional Wetland Size Notes

Transcription

1 1 Thurston County Planning Commission April 6, 2011 Meeting Wetland Jurisdictional Size Comparisons Multiple Jurisdictions Jurisdiction Name (Year Jurisdictional Wetland Size Notes Adopted/Amended) (SF = square feet) Thurston County (1994, as 22,000 SF Rural county 11,000 SF Urban growth area 2,500 SF Adjacent to stream or in 100-year floodplain Thurston County (proposed) 1,000 SF Smaller wetlands may be included if they are: located in riparian habitat or other critical area buffer; are a functional part of a mosaic wetland; or provide essential habitat for priority species Lewis County (2008) 1,000 SF Smaller wetlands may be included if they are: associated with riparian corridor; Mason County (2006) 1,000 SF Smaller wetlands may be included if they are: associated with riparian corridor; Grays Harbor County (2010) 1,000 SF Smaller wetlands may be included if they are: associated with riparian corridor;

2 2 Pierce County No exemption for Category I and II wetlands 2,500 SF for Category III 10,000 SF for Category IV No exemption for Category I or II wetlands; Smaller wetlands may be included if they are contiguous with freshwater or estuarine system, or part of mosaic wetland complex Smaller wetlands may be included if they are contiguous with freshwater or estuarine system, or part of mosaic wetland complex City of Olympia ( ) 1,000 SF Smaller wetlands may be included if they are: associated with riparian corridor; City of Lacey (~2007) Determined site by site, based on field visit City of Tumwater 1,000 SF Smaller wetlands may be included if they are: associated with riparian corridor; City of Yelm Delineation if presence is possible, no size threshold; wetlands usually associated with creek and protected by riparian buffers City of Rainier (2007) Does not appear to be a minimum size City of Tenino (2007) 1,000 SF Smaller wetlands may be included if they are: associated with riparian corridor;

3 3 Wetland Buffer Width Comparisons Multiple Jurisdictions WRS = Wetland Rating System (Ecology) LU = Land Use WQ = Water Quality WRS habitat type = Bogs, Natural Heritage wetlands, forested wetland Jurisdiction Name (Year Adopted/ Amended) Thurston County (1994, as Thurston County (proposed) Standard Buffer Range (Absolute; without reductions) Method of Determination Standard Buffer Width Reduction/Increase/ Reconfiguration/Averaging feet WRS; LU Intensity Reductions and averaging authorized feet Habitat Values/Water Quality requirements Wetland Rating System All authorized Lewis County (2008) Mason County (2006) Grays Harbor County (2010) feet WRS habitat score, then by LU intensity feet WRS habitat type and feet WRS habitat type and habitat quality requirements Reductions and averaging authorized Reduction, increase and averaging authorized Reduction and averaging allowed

4 4 Pierce County City of Olympia ( ) City of Lacey (~2007) City of Tumwater City of Yelm City of Rainier (2007) City of Tenino (2007) feet Sliding scale based on WRS habitat score, also recognizes WRS WQ score and special habitat types feet Sliding scale based on WRS habitat score, then by LU intensity feet WRS habitat type and Reduction, increase and averaging authorized Reduction, averaging authorized Increase, averaging authorized

5 5 Jurisdictional Comparison Impacts to Category III and IV Wetlands Jurisdiction Name (Year Replacement Criteria for Category III and IV Wetlands Adopted/Amended) Thurston County (1994, as None Thurston County (proposed) May impact Cat. III and IV wetlands between 1,000 and 4,000 SF, if: not in riparian area, functional part of wetland mosaic, have WRS habitat rating of less than 20 points, no habitat for priority wildlife species, mitigation Lewis County (2008) Mason County (2006) City of Olympia ( ) City of Tumwater City of Tenino (2007) Grays Harbor and Pierce Counties, Cities of Lacey, Yelm and Rainier May impact Cat. III and IV wetlands smaller than 2,500 SF, if: not associated with riparian corridor, part of May impact Cat. III and IV wetlands between 1,000 and 4,000 SF if: not associated with riparian corridor, part of a wetland mosaic, no essential habitat for priority species, mitigation These jurisdictions do not appear to allow replacement. However, Pierce County exempts smaller Category III (<2,500 SF) and Category IV (<10,000 SF) wetlands from review, subject to standards.