P03_SD_CS-33_Mulch_Blankets_and_Nets_2022.docx
DOCX document 48 KB Posted
- Attached to
- NRCS South Dakota Easement Restoration IDIQ
- Solicitation number
- 12FPC124Q0011
About this file
This document is a Construction Specification from the Natural Resources Conservation Service (NRCS) in South Dakota, providing details on the requirements for mulch blankets and nets to aid in establishing vegetation. It covers the materials and installation specifications for straw, excelsior, and polypropylene mulch netting. Key details include:
The related federal contract opportunity is a solicitation for an NRCS South Dakota Easement Restoration IDIQ, where the contractor shall provide Easement Restoration and Emergency Watershed Protection services to USDA NRCS in South Dakota. Quotes are due by 5/20/2024 at 1700, with questions due by 5/10/2024 at 1400. The contract is issued by the USDA Under Secretary for Farm Production and Conservation.
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Text version
Natural Resources Conservation Service
Construction Specification SD-33 Mulch Blankets and Nets
Scope This work shall consist of furnishing and installing all materials for mulch blankets and nets specified to aid in establishing vegetation.
Materials Mulch Net Netting to control movement of mulch materials shall be designed for coverage of mulch and shall be manufactured from oriented polypropylene, except as otherwise specified. The net shall have individual opening sizes between 3/8 and 1 1/2 inch.
Straw Erosion Control Blanket Straw erosion control blankets shall be a machine-assembled mat consisting primarily of clean, weed-free straw from agricultural crops. The straw must be evenly distributed throughout the mat with a thickness between 3/8 and 5/8 inch. The top of the blanket shall be covered with a biodegradable plastic mesh with opening sizes between 3/8 and 1 inch. The mesh must be adhered to the straw by a knitting process using biodegradable thread.
Excelsior Erosion Control Blanket (Standard Weight) Excelsior erosion control blanket (standard weight) shall consist of a machine produced curled wood excelsior mat with at least 80 percent 6-inch or longer fiber and with even distribution and consistent thickness. Fiber diameter shall be between 0.015 and 0.15 inch. The top of the blanket shall be covered with a polypropylene mesh with 3/8 to 3 inch openings. Dry blanket weight shall be at least 0.7 pounds per square yard.
Excelsior Erosion Control Blanket (Heavy Duty) Excelsior erosion control blanket (heavy duty) shall consist of a machine produced curled wood excelsior mat with at least 80 percent 6-inch or longer fiber and with even distribution and consistent thickness. Fiber diameter shall be between 0.015 and 0.15 inch. The top of the blanket shall be covered with a polypropylene mesh with 3/8 to 1 1/2 inch openings. Dry blanket weight shall be at least 1.4 pounds per square yard.
Staples Except as otherwise specified, staples shall be 11 gage or heavier galvanized steel wire formed into "T" or "U" shape with 6 inch or longer vertical legs. Horizontal measurements of staples must be longer than two mesh opening diameters. Horizontal measurements must not be longer than vertical measurements of staples.
Installation Areas to be covered with mulch net or erosion control blankets shall be fertilized and seeded prior to but not more than two days before installation. All rocks, clods, or other objects over one and one-half inch in maximum diameter shall be removed prior to placing mulch. Except as otherwise specified, the following shall apply:
Application Sequence Nets and/or blankets shall be placed first in the lowest area of water flow and oriented with length in the direction of flow.
Overlap Up-slope sections must lap on top of lower sections. Side edges must overlap at least 3 inches and ends must overlap at least 12 inches.
Top and bottom ends shall be folded under at least four inches and stapled.
Anchoring Prior to anchoring the first laid section, adjust net or blanket laterally in ditch or channel to bring both edges to approximately the same elevation. Nets and blankets shall be held in place using staples driven vertically through the mesh into the soil. Nets or blankets must not be drawn taut in stapling. Except as otherwise specified, staples shall be installed in the following pattern:
| a. | Install a row of staples three feet apart down the low point of all channels and ditches. Place these staples perpendicular to centerline of the ditch. |
| b. | Areas where nets or blankets do not touch the ground shall be secured with extra staples to insure full contact with the soil and/or mulch. |
| c. | Along upper outside edges of the blanketed area where runoff water will flow onto the net or blanket, place a row of staples one foot apart. Where significant ditch or channel water flows pass onto the blanketed area, bury the leading edge of the blanketed area one foot deep into the ground. |
| d. | Along lapped seams running perpendicular to runoff water flow, place a row of staples one foot apart. |
| e. | For all other areas sloped 3:1 or flatter, install staples evenly at the rate of one staple per square yard of net or blanket, and with other edge staples spaced not more than three feet apart. |
| f. | For channel bottoms and areas steeper than 3:1 slope, install staples evenly at the rate of 2 staples per square yard of net or blanket and with other edge staples spaced not more than 2 feet apart. |
| NRCS, SD | CONSTRUCTION SPECIFICATION SD-33 – Page 2 of 2 | October 2022 |
| NRCS, SD | CONSTRUCTION SPECIFICATION SD-33 – Page 1 of 4 | October 2022 |
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