The project goal was to remediate and restore a heavily impacted “Toxic Hot Spot” wetland slough. The impacted property had been in continuous industrial use since the 1900’s as a copper ore smelter and then a pyrite roaster which contaminated a slough vital for ensuring drainage capacity and maintaining tidal influence in the surrounding marshes. The innovative, “first of its kind” solution involved realignment by means of dredging a new winding slough, and capping of the previously contaminated area. The new sinuous design provided foraging habitat for birds and fish while isolating the contaminated sediments preventing them from flowing into the Bay.
Native Suisun Song Sparrows and Salt Marsh Common Yellow Throat nesting locations existed within the construction site. Mason’s Lilaeopsis, a rare plant, also existed in the site and was successfully relocated out of the construction zone. Performing work in active tidal wetlands areas required placing fill at low tides whenever possible to reduce impacts.