Attachment 25QA045.pdf
PDF 5 MB Posted
- Solicitation number
- W912WJ25QA045
About this file
This document is a detailed set of images and instructions for waterbar installation at Buffumville Lake Park, part of a U.S. Army Corps of Engineers walkway contract in Charlton, Massachusetts. The solicitation is set aside for small businesses with a NAICS code of 238110 and a small business size standard of $19 million. The contract requires replacing approximately 700 linear feet of stone dust walkways, three railroad tie staircases, two railroad tie and stone dust picnic platforms, and a 26' by 10' concrete pad, with a construction magnitude between $25,000 and $100,000.
The document includes technical specifications for waterbar installation, explaining their purpose of diverting water off paths and trails. Installation instructions detail using rot-resistant wood logs or timbers, positioning at a 30-degree angle across paths, securing with stones or rebar, and backfilling with crushed stone. The specifications provide comprehensive guidance on materials, placement, and maintenance, including a table for waterbar spacing based on path grade. Vendors must have an active SAM.gov registration to be considered for the contract.
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| File | Type | Posted |
|---|---|---|
| Amendment W912WJ25QA045-0001.pdf | ||
| Solicitation W912WJ25QA045.pdf |
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Text version
®®BUILDING STRONG
FIGURE 1
BUFFUMVILLE LAKE DAM
U.S. ARMY CORPS OF ENGINEERS
NEW ENGLAND DISTRICT
01/2025
WALKWAY CONTRACT
U.S. ARMY CORPS OF ENGINEERSBUFFUMVILLE LAKE PARK
Legend
Vehicle Access
Concrete Pad
Tiers8' Walkways
Water Bar
10' Walkways
1.
2.
1.
2.
0 0.03 0.050.01 Miles
3.
5' Walkways Stairs
LEGEND
Map not to scale. For reference only.
Staircase #1.
Staircase #2.
Staircase #3.
10’ Walkway Install
5’ Walkway Install
10’ Walkway Install
5’ Walkway with 2 Waterbar Install
Tier #1.
Tier #2.
WATERBARS
~diverting water off paths and trails~
Purpose: A waterbar intercepts water traveling down footpaths, trails and other areas and diverts it into stable vegetated areas.
Installation: Install waterbars on moderately steep paths with concentrated flows. Select a location where the waterbar outlet can drain to a stable, vegetated area. Install multiple waterbars as needed and space closer together on steeper slopes as directed in Table 1.
Any rot-resistant type of wood, such as cedar, spruce, fir or hemlock logs can be used. For logs, the diameter should be at least 8� at the small end. 6� to 8� diameter, pressure treated or cedar timbers can also be used. The length should extend past the edge of the path on both sides. Install waterbars as follows:
1. Dig the trench � First, dig a trench for the wood that is a 30° angle across the path. Be sure the trench and the waterbar extends off both sides of the path. The trench should be deep enough so the top of the log will be almost flush with the trail on its downhill side once in place. Soil and rock excavated from the trench should be heaped on the trail below the water bar to be used later as backfill.
2. Install the log or timber � Place the log or timber in the trench. The log should fit snugly in the trench with no high point or voids under the log. Secure the waterbar with large stones, rebar pins or wooden stakes. If using stones, partially bury on downhill side. If using rebar, drill ½� holes 6� in from each edge and pound in 18� pieces of rebar so that the rebar is flush or slightly recessed with the top.
3. Backfill around the waterbar � Dig a 12� wide and 6� deep trench along the uphill side of the bar. Fill the trench with crushed stone, leaving a few inches of the timber exposed.
Place a flared apron of stones to armor the waterbar outlet. Pack soil and gravel up against the downhill side of the waterbar so that the top of it is flush with the trail. Cover all disturbed soil with seed and mulch or leaf litter.
Steel Rebar 18� long
½� diameter
6�-8� diameter log or timber
¾� crushed stone
Side View Top View
Place larger stones to armor outlet
Install at 30° angle
Secure with stones or steel rebar
Line trench with non-woven geotextile
Portland Water District
Materials: Fallen rot-resistant timbers can often be found on site. Pressure treated timbers, cedar landscape timbers and steel rebar can be purchased from lumber and hardware stores. Some stores will cut rebar to the specified length for a small fee. Otherwise, rebar can be cut with a hack saw.
Contact your local Soil and Water Conservation District for suppliers of non-woven geotextile fabric. Other geotextiles, including landscaping weed barrier, can be substituted for smaller projects.
Maintenance: Waterbars should be checked periodically and after storm events to ensure that material is not eroding behind the structure or at the outlet. Any needed repairs should be made as soon as possible. Periodically remove accumulated leaves and debris from behind the waterbar.
Other Types of Waterbars: There are several other types of waterbars that are better suited for diverting water off driveways and gravel roads. For more information, see fact sheets on open-top culverts and rubber razors.
Part of the Conservation Practices for Homeowners Factsheet Series, available at:
Maine DEP (800.452.1942); http://www.maine.gov/dep/blwq/docwatershed/materials.htm
Portland Water District (207.774.5961); http://www.pwd.org/news/publications.php
Table 1. Waterbar Spacing
Grade
Spacing Between Waterbars (feet)
25+
Before After
May 2006 DEPLW0788
File details come from the government source that posted it. Updated .