Notes
Attachment D table summarizing wetland mitigation credit for Seattle-Tacoma International Airport Master Plan Update improvements. Documents in-basin mitigation (102.27 acres, 29.80 credit) and out-of-basin mitigation (65.38 acres, 42.91 credit) for a total of 167.65 mitigation acres and 72.71 total credit. In-basin mitigation includes wetland restoration at Vacca Farm (credit ratio 1:1), wetland enhancement at Vacca Farm, Miller Creek Wetland and Riparian Buffer, Tyee Valley Golf Course, Des Moines Creek Buffer (credit ratio 1:2), buffer enhancement at Miller Creek, Lora Lake, West Branch Des Moines Creek (credit ratio 1:5), and preservation at Borrow Area 3 (credit ratio 1:10). Out-of-basin mitigation includes wetland creation (forest 17.20 acres, shrub 6.0 acres, emergent 6.20 acres, open water 0.60 acres), wetland enhancement, and buffer enhancement. Mitigation areas located in Des Moines and Miller Creek watersheds.