Sample_Erosion_Control_Plan.docx

Calamity Carroll Road Stabilization Example Erosion Control Plan

Brief Project Description:

This project is designed stabilize existing roads in 2 separate locations, Upper Carroll and Shoal Cove. Upper Carroll experienced numerous landslides along several miles of road during a high rainfall event in 2010. A 70’modular bridge was washed downstream, many culverts were overwhelmed with debris, and several short segments of roads were covered with up to 6’ of logs and displaced soil. Shoal Cove road work involves removing drainage structures on roads to be stored.

General project objectives are to: improve natural hill slope and stream channel hydrology by installation of new road drainage structures; removal of stream crossing fills; construction of cross drains; and reducing existing and potential sedimentation into stream courses by removal of unstable fills and re-vegetation of disturbed soils. More specific objectives are the following:

· Remove drainage structures damaged or plugged with debris.

· Remove drainage structures on isolated roads not needed in the near future.

· Restore stream beds and banks to natural conditions on stored roads.

· Remove landslide material from roads and ditches, placing all material in a stable location.

· Restore drainage patterns by installing new culverts.

· Minimize cut slope disturbance (excavations).

· Avoid placement of materials in unstable areas (wet, swales, headwalls).

· Recover the displaced modular bridge from the stream.

· Establish cross drains to move ditch flow across the roadway prior to reaching streams.

Erosion Control Measures Temporary:

1. Seed and fertilize all disturbed areas within 14 days of completion of construction activities at the site.

2. Install temporary check dams and sediment fences as necessary to minimize the entry of silt-laden water into streams or other water bodies.

Permanent:

1. Space cross ditches to minimize erosion

2. Armor all cross drain outlets with large (12”+ size) rock obtained from the excavated road prism.

3. Armor with rock the entire length and width of the 108” culvert removal site on road 8444000.

4. Dispose of excess material (spoils) so it does not enter stream channels or other water bodies. Place excess material a minimum of 20’ for stream channels.

5.

Specific Sites of Concern: (large fills, stream-adjacent slopes, unstable soils):

Landslide areas at Upper Carroll Inlet on road 8448000 and road 8444000 at Shoal Cove.

Scheduling (includes timing, item/provision, and contract specifications/reference):

Contract Construction

Contractor: Date:

Contracting Officers Representative: Date: