USDI-BLM

Specifications for Installation of Fences

A. GENERAL DESCRIPTION

This project will be constructed under contract with the materials and labor furnished by the Contractor for the Socorro Field Office of the Bureau of Land Management (BLM).

B. PRECONSTRUCTION AND INSPECTION

A preconstruction meeting will be held prior to the start of project construction. The Contractor will notify the BLM office 3 days in advance for scheduling the meeting.

Present at the meeting will be, at minimum, the BLM COR/Project Inspector for the project, the Contractor, and the Contractors Laborers. The purpose of this meeting will be to review required work, project drawings, specifications, and general stipulations for installation of the project. The Contractor is responsible for notifying the Project Inspector, Socorro Field Office, 901 S. Hwy 85, Socorro, New Mexico 87801, (575) 835- 0412, prior to starting construction. The project will be inspected during construction for compliance with the specifications, drawings and stipulations. A final inspection will be made after notification by the Contractor that the project is completed. Final inspection shall be done prior to Demobilization and Invoicing.

C. ON-SITE REQUIREMENTS

The BLM will set necessary stakes or flagging when required to give the Contractor measurements, lines, and locations to complete the installation of the fence as shown on the drawings. The work shall be performed in conformity with the stakes or flagging.

D. MATERIALS

Contractor furnished materials – The Contractor will furnished all materials and Labor.

The Contractor shall load and transport materials to the worksite and shall be responsible for protection of materials from theft and damage until work is completed and accepted by the BLM.

E. EXICUTION

The fence will be built in accordance with the attached drawings and specifications. The drawings show post and wire spacing, along with other dimensions and design. The Contractor will complete the project within 90 days after receipt of Notice to Proceed, or as indicated in the Contract Period of Performance.

The Contractor shall remove only the brush and trees which are flagged by the BLM or as has been discussed in the pre-work conference.

Should an archaeological or historical site be encountered during construction, work shall cease immediately, the BLM area archaeologist will be notified.

Access is to be from existing roads and authorized routes only. No new roads are to be bladed without prior consultation and authorization.

F. MATERIAL SPECIFICATIONS

Barbed Wire: A strand of two 12 1/2-gauge galvanized wires twisted together with two-point barbs of 14-gauge wire spaced 4 inches apart. Wire and barbs shall be zinc-coated steel, with a zinc coating of at least 0.3 oz/ft5 of coated surface area. The minimum breaking strength of wire shall be 950-lbs. force

Barbless Wire: A strand of two 12 1/2-gauge galvanized wires twisted together.

Wire shall be zinc-coated steel wire of at least 0.3 oz/ft5 of coated surface area.

The minimum breaking strength of wire shall be 950-lbs. force.

Wire Fence Stays: Shall be twisted wire fence stays manufactured from smooth galvanized 9-gauge wire.

Wood Fence Stays: Shall be sound and straight pieces, 2” to 3” inch diameter of the species listed under wood posts and braces. Treatment with preservative is not required. Stays shall be of uniform length sufficient to extend a minimum of 3 inches above the top fence wire and 6 inches below the bottom wire. Honey locust, western redcedar (full stem with bark removed), juniper, osage orange, and white oak are acceptable without treatment. Ponderosa pine, lodgepole pine, fir, balsam, and tamarack will be acceptable if treated for the full length.

Staples: Staples shall be 9-gauge, bright-finish or galvanized, 1-1/2” inches long.

Steel Fence Posts: Steel posts shall be painted solid green (white or silver tipped posts will be allowed), galvanized "T" type, with a welded or riveted anchor plate, and shall be furnished with clip-type wire fasteners (punched tabs for fastening wires are not acceptable). Steel posts shall be manufactured from wrought, rail, or new billet steel, and shall weigh a minimum of 1.33 lbs/linear ft.

exclusive of the anchor plate. Steel “T” post spacing is 16 feet 6 inches.

Steel Pipe Posts: Galvanized steel pipe shall be new standard weight schedule

40 or better. Pipe shall be 2 inches in diameter. Non galvanized pipe shall be painted as specified. 2-3/8” drill stem pipe can be used to construct brace panel “H-braces”.

Angle Iron Posts and Braces: All posts and braces shall be painted solid green after they have been cleaned of all loose scale and rust. Posts shall be painted with one or more coats of weather resistant, air drying or baking, paint or enamel.

1. Angle Iron Posts: Shall be a minimum of 6 feet, 6 inches long, 22 inches by

22 inches by 3 inch in dimensions.

2. Angle Iron Braces: Shall be a minimum of 5 feet long, 2 inches by 2 inches by 3 inch in dimensions.

Wood Posts and Braces: Wood Posts are not acceptable.

Clip-Type Wire Fastener: Shall be 11-gauge galvanized wire.

Brace Wires: Shall be double loop, four wires of 9-gauge smooth, galvanized wires or two wires of galvanized, 12 1/2-gauge barbless-wire, twisted tight.

Miscellaneous Wire: Wire for gate loops and fasting wood stays shall be 9 or

12 1/2-gauge galvanized wire (smooth).

Post Grout: The grout shall be a rapid setting commercial product manufactured for anchoring posts.

Paint:

1. Exterior paint shall be metal primer followed by exterior enamel.

2. Metal primer shall be first line, highest quality alkyd primer for inhibiting rusting of new ferrous metal surfaces.

3. Exterior enamel shall be first line, highest quality, general purpose alkyd enamel suited for outdoor use on metal and offer high resistance to deterioration from moisture, weather, and abrasion. Color shall be the same green as required for the steel "T" fence posts.

4. All paint shall be lead free.

Wire Gates: Shall have the same type wire and wire spacing as the fence. Wood stays for wire gates shall be sound and straight pieces, 3-inch minimum diameter, and of the species listed under posts and braces. Minimum width of wire gates is 16 foot.

G. INSTALLATION OF POSTS, GATES, AND BRACES

General: Steel "T" posts will not be used for end-panel, corner-panel, gate-panel, or stress-panel posts. Steel pipe or angle iron may be used for end panels and stress panels. If pipe is used the horizontal braces will be a minimum of 5 feet long and be welded in place.

Setting Posts: Dig holes for setting posts to the depth as shown on the Work

Data Sheet. Set posts plumb and to the spacing, grades and depths as shown on the drawings, unless staked otherwise. Space within 6 inches of that dimension shown on the drawings or in the Work Data Sheet. Steel pipe or angle iron posts shall be set in holes and grouted solidly in position with cement grout or mortar.

Post Grout shall be a rapid setting commercial product manufactured for anchoring posts.

Driving Posts:

1. Steel Posts: Drive steel posts into the ground to the depth shown on the drawings or until the anchor plate is slightly below the ground surface. Posts shall be driven plumb. Posts that are split, twisted, bent, or have broomed tops will not be accepted. When rock formations prevent driving remove anchor plate and excavate or drill holes a minimum of 18 inches deep and slightly larger than the diameter of the post. Place posts in the holes and grout the post solidly in position with cement grout or mortar. Steel “T” post spacing is 16 feet 6 inches for typical line panels.

Corner Post, Gate Post, Stress Panel and End Panel Assemblies: Construct as shown on the drawings or as staked in the field. Rock jacks shall not be substituted for these items. Construct stress panels on crests of hills, and a maximum of 80 rods center-to-center for barbed wire sections. In addition, stress panels are required at points between which wire is to be stretched.

Construct end panels at the end of fence runs unless shown otherwise on the drawings.

Wire: Stretch tightly and staple to wood posts or securely attach to steel posts with standard wire clips. Wire is properly stretched when it is springy to the touch. Avoid excessive tension in the wire. Drive staples into wood until the staple comes in contact with the wire against the post, but not so tight as to crimp the wire or prevent free movement of the wire between the post and the staple.

Do not drive staples parallel to the grain of the wood. Terminate wire at each end post, gate post, corner post, or stress panel by wrapping wire around the post two times and tie off by wrapping the incoming wire a minimum of four times.

Wire Spacing from ground level up: first wire - 16 inches above ground level to bottom wire (smooth wire). Second wire - 6 inches above bottom wire, barbed. Third wire - 8 inches above second wire, barbed. Top wire - 12 inches above third wire, barbed (42 inches from ground level), also 6 inches from top wire to top of post.

Gates: Shall be installed according to the Work Data Sheet, the drawings, and as recommended by the manufacturer when applicable.

Mechanical Gate Closures: Line up the latch with the gate. Adjust latch assembly after installation so that the latch does not bind and the gate hangs properly.

Brace Wire: Shall be twisted tight with a stick. Leave one end of the stick long enough to fasten behind the horizontal brace to prevent wire from unwinding.

WORK DATA SHEET

FOR

WIRE FENCES AND GATES

Fence type: Four-wire fence Type of top wire: Barbed Type of intermediate wires: Barbed Type of bottom wire: Barbless

Dimensions for Drawing No. 02834-1 Barbed Wire Fence (Four-wire), Drawing No. 02834-6 Wire Gates and Drawing No. 02834-9 Corner Panels.

Wire Spacing from ground level up:

A - 16 inches from ground level to first wire (smooth wire).

B - 6 inches from bottom wire, barbed.

C - 8 inches from second wire, barbed.

D - 12 inches from third wire, barbed. (42 inches from ground level).

E - 6 inches from top wire to top of post.

Brace Posts H1 - 6 feet 6 inches h1 - 2 feet 6 inches

Line Posts H2 - 5 feet 6 inches h2 - 18 inches

Line Panels L - 16 feet 6 inches I - 8 feet 3 inches

Specifications for Installation of Fences