The green area is the inlet for Diagonal Marsh, a salmon habitat restoration area on the industrial Duwamish waterway. This is the site of a problematic $10million superfund cleanup. PCBs and pthalates from stormwater are recontaminating the clean cap of the site. After what they learned here about the extent of contamination being carried from polluted soils throughout the valley by stormwater, the rest of the river cleanup is on hold. There were salmon jumping all throughout the cruise.