Environment & Sustainability | Environmentally Critical Areas
a) Permanent Wetland Mitigation. The following ratios of area of mitigation to area of alteration apply to mitigation measures for permanent alterations.
PERMANENT WETLAND MITIGATION
Category and type of wetland
Wetland reestablishment or creation
Wetland rehabilitation
1:1 Wetland reestablishment or wetland creation (R/C) and wetland enhancement (E)
Category 1 Bog
Not allowed Not allowed
6:1 rehabilitation of a bog 6:1 rehabilitation of a natural heritage site
Case-by-case Case-by-case
Natural heritage site
Based on score for functions
4:1 6:1 3:1 2:1
8:1
1:1 R/C and 6:1 E 1:1 R/C and 10:1 E 1:1 R/C and 4:1 E 1:1 R/C and 2:1 E
Forested
12:1
Category 2 Category 3 Category 4
8:1 4:1
1.5:1
3:1
1:1 R/C and 2:1 E
b) Temporary Wetland Mitigation. The following ratios of area of mitigation to area of alteration apply to mitigation measures for temporary alterations where wetlands will not be impacted by permanent fill material:
TEMPORARY WETLAND MITIGATION
Category and type of wetland
Permanent conversion of forested and shrub wetlands into emergent wetlands
Mitigation for temporal loss of forested and shrub wetlands when the impacted wetlands will be revegetated to forest or shrub communities ENHANCEMENT REHABILITATION CREATION OR RESTORATION
ENHANCEMENT REHABILITATION CREATION OR RESTORATION
Category 1 Category 2 Category 3 Category 4
6:1 3:1 2:1
4.5:1
3:1
3:1
2:1
1.5:1 .75:1
2:1
1.5:1
1.5:1
1:1
1.5:1
1:1
1:1
.75:1
.5:1
1.5:1
1:1
.75:1
Not applicable Not applicable Not applicable
102 | Title 21: Sammamish Development Code
Effective | January 1, 2022
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