178 SECTION 260
260.01 Description
This work consists of furnishing, installing, maintaining, and removing silt fence.
260.02 Equipment
Reserved.
260.03 Materials
A.Posts. Do not use silt fence with posts pre-attached. Use posts that have a minimum length of 4 feet.
1.Wood Posts. Use one of the following wood posts with the minimum dimensions: − 2 inch diameter round wood posts; or − 1.5 × 1.5 inches rectangular wood posts.
2.Steel Posts. Use steel posts that are a minimum of 0.95 pounds per foot and have projections for fastening wire or fabri c.
B.Filter Fabric. Provide filter fabric as specified in AASHTO M 288. Use fabric with a minimum width of 36 inches. Protect the filter fabric from moisture and ultraviolet exposure before placement.
C.Silt Fence Supported. Use wire backing or monofi lament silt fence when installing supported silt fence. If backing for a silt fence is required, use a steel wire fence fabric meeting the following: - A minimum of 32 inches wide; - Has a maximum opening size of 6 × 6 inches; and - Is a minimum of 14 gauge, gr ade 60.
260.04 Construction Requirements
A.Installation. Install continuous silt fences transverse to the flow and follow the contours of the site. Place the fence so water cannot flow around the end of the fence. If joining two sections of filter fabric, overlap at support posts a minimum of 18 inches in such a manner that prevents silt from passing through the fence.
B.Maintenance. Remove sediment when it reaches 1/3 of the exposed height of any section of the silt fence, or as directed by the Engineer. The Engineer may direct the installation of additional silt fence if removing the sediment deposit is not feasible. 179 Inspect the silt fence within 24 hours of each rainfall greater than 0.25 inches and at least daily during prolonged rainfall. Submit a silt fence inspection report within 24 hours of each inspection. Perform a daily review of the location of silt fences and check for effectiveness. In addition, the Contractor shall make daily review of the location of silt fences in areas where construction activities have changed the natural contour and drainage runoff to ensure that the silt fences are properly located for effectiveness. Immediately repair or remove and replace ineffective silt fence.
C.Removal. Do not remove the silt fence without the Engineers approval. Level, smooth, seed, and mulch the removal area to match existing conditions.
260.05 Method of Measurement
The Engineer will measure as specified in Section 109.01, “Measurement of Quantities” and as follows: Material used for overlaps and seams will not be measured.
260.06 Basis of Payment
Pay Item Pay Unit Silt Fence Supported Linear Foot Silt Fence Unsupported Linear Foot The Department will pay for the cleaning of sediment deposits as specified in Section 109.03 C, “PS-1 Price” . The Department will pay for the removal of pre-existing silt fence as specified in Section 109.03, “Compensation for Contract Revisions” . Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified. Section 261 180 SECTION 261 FIBER ROLLS
261.01 Description
This work consists of furnishing, installing, maintaining and removing fiber rolls.
261.02 Equipment
Reserved.
261.03 Materials.
Provide fiber rolls that are composed of degradable netting that contains compressed: − Hay or straw that is seed free and free of noxious weeds; or − Wood excelsior.
261.04 Construction Requirements
A.Maintenance. Remove sediment when it reaches 1/3 of the exposed height of any section of the fiber roll, or as directed by the Engineer. The Engineer may direct the installation of a second fiber roll if removing the sediment deposit is not possible. Inspect the fiber rolls within 24 hours of each rainfall greater than 0.25 inches and at least daily during prolonged rainfall. Submit a fiber rolls inspecti on report within 24 hours of each inspection. Perform and submit a daily review of the location of fiber rolls and check for effectiveness. Remove and replace fiber rolls when necessary.
B.Removal. Do not remove the fiber roll without the Engineers approval. Level, smooth, seed, and mulch the removal area to match surrounding conditions.
261.05 Method of Measurement
The Engineer will measure as specified in Section 109.01, “Measurement of Quantities” and as follows: The Engineer will not measure overlaps.
261.06 Basis of Payment
Pay Item Pay Unit Fiber Roll __IN Linear Foot Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified.
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 213–214 of 550.