Primary cost components for stormwater wetlands

Primary cost components for stormwater wetlands
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Implementation stage	Primary cost components	Basic cost estimate	Other considerations
Site preparation	Tree and plant protection	Protection cost ($/acre) * affected area (acre)	Removal of existing structures, topsoil removal and stockpiling
	Topsoil salvage	Salvage cost ($/acre) * affected area (acre)
	Clearing and grubbing	Clearing cost ($/acre) * affected area
Site formation	Excavation and grading	4-foot depth excavation cost ($/acre) * area (acre)	Soil and rock fill material, tunneling
	Hauling material off-site	Excavation cost * (% of material to be hauled away)
Structural components	Inlet structure	($/structure)	Pipes, catch basins, manholes, valves
	Outlet structure	($/structure)
Site restoration	Soil preparation	Soil cost ($/acre) * seeding/planting area (1 foot average depth per acre)	Tree protection, soil amendments, seedbed prepparation, trails
	Seeding (or sodding)	Seeding cost ($/acre) * seeded area (acre)
	Planting/transplanting	Planting cost ($/acre) * planted area (acre)
Annual operation, maintenance, and inspection	Debris removal	Removal cost ($/acre) * area (acre) * frequency (2 per year)	Vegetation maintenance, cleaning of structures
	Invasive plant removal	Labor cost ($/hr) * time * frequency
	Sediment removal	Removal cost ($/acre) * area (acre) * frequency (1 per 5 years)
	Erosion repair	Repair cost ($/acre) * area affected
	Gate/valve operation	Operation cost ($) * operation frequency (2 per year)
	Inspection	Inspection cost ($) * inspection frequency (2 per year)
	Mowing	Mowing cost ($/acre) * mowing frequency (4 per year)