P03_SD_CS-96_Silt_Fence_2022.docx
DOCX document 47 KB Posted
- Attached to
- NRCS South Dakota Easement Restoration IDIQ
- Solicitation number
- 12FPC124Q0011
About this file
This document is the Natural Resources Conservation Service (NRCS) Construction Specification SD-96 for Silt Fence. It outlines the requirements for furnishing materials, equipment, and labor to install silt fences in South Dakota.
The specification covers the quality and installation requirements for silt fence fabric and posts. It specifies the fabric shall meet NRCS Material Specification SD-592 for Class II and III materials. The posts may be wood, steel reinforcing, or steel pipe. Silt fence shall be installed along slopes, at the base of slopes, or as indicated, with a maximum post spacing of 8 feet. For concentrated flow areas, the fence shall be installed perpendicular to the flow with 4-foot maximum post spacing. The fence shall be keyed into the ground a minimum of 6 inches. Maintenance requirements include cleaning sediment when it reaches one-third the fence height and inspecting/repairing the fence after runoff events.
The related federal contract opportunity is the NRCS South Dakota Easement Restoration IDIQ, Solicitation #12FPC124Q0011. This solicitation seeks Easement Restoration and Emergency Watershed Protection services in South Dakota, with quotes due by 5/20/2024 and questions due by 5/10/2024.
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Text version
Natural Resources Conservation Service
Construction Specification SD-96 Silt Fence
Scope The work shall consist of furnishing all material, equipment, and labor necessary for the installation of silt fences.
Quality Silt fence fabric shall conform to the requirements of Material Specification SD-592, Table 1, Class II and III and this specification. Posts may be wood, steel, or steel T fence posts. Wood posts shall have minimum dimensions of 1.5”x1.5” by the length shown on the plans. Steel shall consist of either size #6 reinforcing steel or larger, or shall consist of ASTM A 120 steel pipe with a minimum diameter of 3/4 of an inch.
Storage Before installation, silt fence shall be protected from damage by weather, sunlight, and other causes.
Installation Where silt fence is placed to contain sediment from runoff from slopes, hills, berms, or spoil piles, place the silt fence along the contour of the slope, the base of the slope, or as shown on the plans. The maximum spacing of the posts shall be eight feet.
Where silt fence is placed to contain sediment from concentrated flow (pipe discharge, culverts, waterways) place the silt fence perpendicular to the flow with the ends turned upstream or as shown on the plans. The maximum spacing of the posts shall be four feet.
The fabric shall be anchored to the post by a minimum of three staples or ties.
Bottom of the silt fence shall be keyed in a minimum of six inches.
Trenches shall not be excavated wider and deeper than necessary for proper installation.
The final eight feet of the silt fence shall be turned up the slope.
Maintenance Typical silt fence life is five to eight months. If permanent vegetation is not established during this period of time, the fence shall be inspected to determine if the fabric needs to be replaced.
Clean sediment from silt fence when accumulations reach one-third the height of the exposed fence.
Silt fence shall be inspected after every runoff event and promptly repaired if necessary.
| NRCS, SD | CONSTRUCTION SPECIFICATION SD-96 – Page 2 of 2 | October 2022 |
| NRCS, SD | CONSTRUCTION SPECIFICATION SD-96 – Page 1 of 4 | October 2022 |
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