Earthwork

Excavation and earthwork typically include bringing the wetland site to finished grade, constructing berms and access ramps, and, in the case of FWS wetlands, reserving and replacing topsoil in the bed to serve as the vegetation growth medium. Costs ranged from $11,523/ac at Gustine to $8622/ac at West Jackson County.

TABLE 6.23

Annual Operation and Maintenance Costs for Free Water Surface Wetlands

TABLE 6.23

Annual Operation and Maintenance Costs for Free Water Surface Wetlands

Design Flow

Area

Annual Cost

Location

(mgd)

(ac)

($/ac)

Cannon Beach, Oregon

0.68

16

4500

Gustine, California

1.0

24

819

Mt. Angel, Oregon

2.0

10

1780

Ouray, Colorado

0.36

2.2

1364

Source: Data from Crites and Lesley (1998) and WEF (2001).

Source: Data from Crites and Lesley (1998) and WEF (2001).

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