S01 Amendment 02 64 Spec Items of work Changes.pdf
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- Emergency Watershed Protection Little Creek Church Site 1, Kanawha County, West Virginia
- Solicitation number
- 12FPC325Q0003-1
About this file
This is a construction specification document detailing requirements for Wire Mesh Gabions (Bid Item 2) for a streambank stabilization project in Little Creek, West Virginia. The document outlines specific technical requirements for gabion installation, including the use of twisted-mesh baskets with Gray PVC coating and zinc coating (ASTM A975 Style 3), mandatory lacing fasteners, and rock requirements conforming to Material Specification 523 or West Virginia Department of Highways approval.
Key construction requirements include: foundation preparation and first row placement within 24 hours of excavation, hand placement of rocks (minimum 4 inches) on visible faces with flat edges turned outward, mandatory use of lid stretchers, and backfilling with coarse-grained materials. The work includes subsidiary items such as pollution control, seeding and mulching, traffic control, water removal, excavation, earthfill, contractor quality control, geotextile installation, and obstruction removal. The contractor is responsible for debris removal, landfill fees, and may assemble gabions off-site at contractor facilities not exclusively dedicated to this federal contract.
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Text version
Chapter 2 National Standard Construction Specification Part 642 National Engineering Handbook
NRCS – AUGUST 2023
WV-EWP-LITTLE CREEK 64–4
7. Items of work and construction details
Items of work to be performed according to this specification and the construction details are:
A. Bid Item 2, Wire Mesh Gabions
(1) This item shall consist of furnishing, assembling, and installing rock-filled wire mesh gabions as shown in the drawings and staked in the field. This item shall also include all excavation necessary to install the gabion wall protection to neat lines and grade.
(2) Included in the item is the removal and disposal of trash and debris within the work area. Refuse material shall be hauled to an approved off-site landfill. Contractor shall be responsible for landfill tipping fees.
(3) In Section 2, Types, gabions shall be twisted-mesh baskets. The gabion baskets shall also include
Diaphragms.
(4) In Section 2, Material:
(a) Gabion basket wire and all other wire shall be coated with Gray PVC. Twisted-wire mesh shall be zinc- coated and coated with PVC (ASTM A975 Style 3).
(b) All fastenings shall be made by lacing for twisted-mesh. Ring fasteners or other alternative fastening methods are prohibited.
(c) Rock shall conform to the requirements of Material Specification 523, Rock for Riprap,
(d) Type 1 or be from a source with current approval with the West Virginia Department of Highways.
(e) In Section 2, Materials, Rock, “30 days” is hereby changed to “2 days.”
(5) In Section 3, Foundation preparation, within 24 hours of the foundation being excavated, the first row of gabion baskets must be placed and backfilled.
(6) In Section 4, Assembly and placement, twisted-mesh baskets shall be assembled using lacing wire and welded- mesh baskets shall be assembled using spiral binders.
(7) In Section 5, Filling Operation, hand placement is required to assure no rocks smaller than 4 inches are exposed on visible faces. The rock on visible faces are also required to be placed such that flat edges are turned out to make a smooth surface. Hand placing is also required to remove voids around all edges of baskets and under the crosstie wires. A minimum of one lid stretcher must be onsite to facilitate closing the lids.
(8) Gabion baskets are to be unfolded and all kinks and unwanted folders are to be removed prior to assembling.
(9) Gabion baskets may be assembled off-site. “Off-site” is defined as work areas where work is being performed at the contractor’s headquarters, tool yards, etc. and must not be dedicated to the exclusively to the performance of the federal contract.
(10) Gabions will be backfilled with coarse-grained materials obtained from required excavations. Where adequate material is not present, the contractor shall obtain a suitable supply from an off-site location.
All backfill materials will be approved by the NRCS Technical Representative before placement.
(11) In Section 6, Measurement and payment, method 2 will apply.
(12) Items of work subsidiary to this bid item are:
(a) Pollution Control, Construction Specification 5
(b) Seeding, Sprigging and Mulching, Construction Specification 6
Chapter 2 National Standard Construction Specification Part 642 National Engineering Handbook
NRCS – AUGUST 2023
WV-EWP-KANAWHA COUNTY 64–5
(c) Traffic Control, Construction Specification 9
(d) Removal of Water, Construction Specification 11
(e) Excavation, Construction Specification 21
(f) Earthfill, Construction Specification 23
(g) Contractor Quality Control, Construction Specification 94
(h) Geotextile, Construction Specification 95
(i) Obstruction Removal, Construction Specification 401
| A. Bid Item 2, Wire Mesh Gabions |
| prohibited. |
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