Replace Perimeter Fencing

PRESOLICITATION NOTICE - THIS IS NOT A SOLICITATION

The purpose of this memorandum is to explain the Contracting Officer's logic supporting the inclusion of the following four option items in the solicitation W50S6M-22-B-0001, project number BRKR202005, Replace Base Perimeter Fence at the 117 Air Refueling Wing, Birmingham, AL.

1. Construct an asphalt access road for AT/FP measures. Provide all labor, tools, parts transportation, tools, equipment, materials, supplies, services, permits, insurance, supervision necessary to install asphalt access road as per Specifications and Drawings.

2. Install concrete driveway. Provide all labor, tools, parts transportation, tools, equipment, materials, supplies, services, permits, insurance, supervision necessary to install concrete driveway as per Specifications and Drawings.

3. Install erosion control measures and clear trees. Provide all labor, tools, parts transportation, tools, equipment, materials, supplies, services, permits, insurance, supervision necessary to install erosion control measures and clear trees

4. Install security bollards. Provide all labor, tools, parts transportation, tools, equipment, materials, supplies, services, permits, insurance, and supervision necessary to install security bollards.

This project will consist of replacing the boundary fence line according to UFC

4-022-03, and constructing access road for security concerns, located at the

117ARW, 5401 East Lake Blvd, Birmingham, AL 35217. Any plans provided

are original construction documents for information to the bidder and any

reference to new work should be ignored. Field verification of all work items,

site conditions, or any questions about the work to be performed are required

before submission of bids.

B. Replace 5,867 linear feet of chain link fence. Removal of fence includes posts,

fabric, and portions of the old fence posts that remain visible. Contractor will

haul the old fence and attachments off base, and dispose of. Use of concrete for

the fence project will be subject to compressive tests. Government will take

samples, and perform 7, 14, and 28 day tests. Compressive tests must be in

compliance with UFC standards. The section of fence that will be replaced is

indicated on Section 3-15.

C. Clearing and grubbing of 7,260 square yards of trees and vegetation.

Dimensions to clear the designated area include 30’ on the outside of fence,

and a 20’ on the inside of the fence. Clearing and grubbing include any

vegetation over 8” in height. This includes clearing small shrubs all the way to

large trees 24” in diameter.

D. Earthwork will be needed on the east fence line to make way for riprap. Remove

4” of top soil from future fence line to retaining wall to equivalent to 370 square

yards. Section 3-15 will indicate area. Geotextile will be placed on the remaining

subgrade, before riprap is laid. Riprap will be 9” in size.

E. Remove existing outriggers with the three strand barbed wire, and install new

“Y” outriggers with six strand of barbed wire for 545 LF. Indicated on map.

F. Installation of the new fence line will follow the same route as the existing fence

line unless directed otherwise.

G. Fencing fabric must be minimum 9-gauge wire mesh and mesh openings must

not be greater than 2-inches per side. Fence fabric material will be galvanized

steel. The fencing fabric must be extended to within 2 inches of firm ground

and anchored using horizontal bottom rails, tension wires, or concrete curbs

materials. Locate all posts, rails, bracing and tension wires on the

secure/protected side of the fencing fabric. See drawing 3.1

H. Fencing fabric must be mounted on steel posts that are set in concrete with

additional bracing at corners and gate openings, as necessary. Posts, bracing,

and all other structural members must be placed on the secure-side of the

fencing fabric.

I. Steel truss rods used for bracing must have a minimum nominal diameter of

5/16 inch and provided with turnbuckles for tensioning. Provide bracing for

each gate, terminal and end post. Install truss rods diagonally from near

ground level of the gate, terminal or end post to within 6 inches from the top of

the fabric at the adjacent line post. Fencing fabric can be securely fastened to

tension wires on the top and bottom with 9 gage galvanized tie wires

incorporating at least three full twists, 9 gage round wire galvanized hog rings,

or in a manner that provides a tensile strength equal to or greater than the

strength of the fencing fabric. Securing all fastening and hinge hardware by

welding to prevent disassembly of fencing and gate components.

J. All security and perimeter fencing must have a minimum fence fabric height of

7 feet excluding the top guard. Fence height including outriggers must be a

minimum of 8 feet.

K. When required, install outriggers at 45-degree angles in a "Y"/"V"

configuration, constructed of a double outrigger consisting of 18-inch arms,

each having three strands of barbed wire at regular intervals along the top of

the fence.

L. The outriggers must provide a minimum of an additional 12 inches to the

fence height. The top guard fencing adjoining gates with vertical height of 18

inches, but for a limited distance along the fence line to adequately open the

gates. Outriggers must be permanently affixed to the fence posts with screws

or by spot welding. Screws used to affix outriggers to posts must be made

tamper-proof either by design, peening, or welding.

M. Fences require 6 strands of barbed wire equally spaced. Barbed wire must

consist of two 12.5-gauge twisted line wires with 15-gauge round barbs.

Barbed wire must be zinc-coated steel. All barbs must consist of four points

and spacing of barbs must be at 5-inch centers.

N. Fences must be grounded at each side of a gate or other opening. In addition

to openings, grounding will be added at the start and last post of fence

section. Gates must be bonded to the grounding conductor, jumper, or fence.

A buried bonding jumper must be used to bond across a gate or other opening

in the fence, unless a nonconducting fence section is used. If barbed wire

strands are used above the fence fabric, the barbed wire strands must be

bonded to the grounding conductor, jumper, or fence. When fence posts are of

conducting material, the grounding conductor must be connected to the fence

post or posts, as required, with suitable connecting means. When fence posts

are of nonconducting material, suitable bonding connection must be made to

the fence mesh strands and the barbed wire strands at each grounding

conductor point. See section 3.1 for grounding detail.

O. Ditches and swales must provide additional fencing below, suspending from

the lower rail of the main fence to the auxiliary frame and around the sides of

the ditch. The added fence must be attached every 2 inches along the

intersection of the two fence sections and either attached to a series of ground

stakes secured to the sides and bottom of the ditch, or embedded in a

concrete sill in the ditch or swale. Concrete curbing must be used to fill areas

between fencing and ground surface. Several cases in this project will include

adding additional fabric to extend into the ditches. Most will only include a few

additional inches in depth. See section 3.3 and 3.4 drawing.

P. Provide a screen arrangement below fencing using vertical and/or horizontal

steel bars or pipes for ditches and swales receiving frequent water flow.

Provide a maximum spacing of 9 inches between either vertical or horizontal

bars. Possible debris must be considered when designing the spacing

between bars. Crossing bars must be welded at each intersection, with bars

embedded 6 inches into concrete and fastened to the bottom rail of the

crossing fence.

Q. Where cabling exist, replace post by post to ensure holding tension of the

cabling. Do not demo entire fence line with cabling, unless COR approves. As

new fabric and accessories are installed, ensure cabling is installed same

height as previously on old fence. Please refer to the DOD Anti-Ram Vehicle

Barrier listing to choose the correct cabling. Cabling must be securely bolted

back on. See section 3.5 and 3.6 for drawing.

R. Roughly 1575 LF of cabling will be added to fence line. Reinforcing cables

must be terminated to concrete deadman anchors. Anchors are to be placed

at intervals of 200 feet on the secure/protected side of the perimeter fencing.

Offset deadman anchors from fence at the minimum distance required to

avoid interference with post and to allow maintenance access to the

turnbuckles, clamps, and other accessories. Terminations for 200’ sections

should overlap the adjacent cabling section to ensure no lapse of coverage.

DOD Anti-Ram Vehicle Barrier listing will be provided to contractor. See

drawing 3.7 for cable terminations.

S. Eyebolts embedded in the concrete deadman anchors may have either a

welded "T" or "L" end. The eyebolt can either be in-line with the attached

cable or flush against the deadman surface. When used, eyebolts should be

welded and galvanized to the anchor rods. The top side of the deadman can

be placed flush with or below the ground surface with the eye of the eyebolt

above ground. Threaded rods may also be used as an alternative to the eye

bolt when securing the cables to the deadman anchor. When using threaded

rods, the threaded rod and wire rope connection must be visible above ground

like the eyebolt previously described.

T. With the case of cable terminations, bollards will be placed in the weaken

areas. This is to ensure protection is still provided. Eight bollards will be

placed at 4’ intervals or less. See section 3.5, 3.7, and 3.8 for bollard details.

CAD drawings will indicate location of needed bollards.

U. For concrete pipes that pass under fences, the grill ends must be welded to a

steel rim that fits snugly over the concrete pipe. The rim and grillwork will be

fastened over the concrete pipe and bolted or pinned to the rim of the

concrete pipe. Grill ends may be embedded in a concrete headwall that

encapsulates the concrete pipe. Grills must be placed on attack side of the

fence. Care must be taken during design to assure that bars and grills across

culverts are not susceptible to clogging. All utility openings are intended to be

designed with a debris catcher to permit either rapid clearing or removal of

grating for cleaning when required. Steel used for grill must be in accordance

with ASTM A529 and the corrosion prevention control section of the UFC. See

section 3.12 for drawing. Contractor may submit their plan for options other

than mentioned.

V. The double swing vehicular gate must be designed to swing inward, toward

secured area. A 2 inch maximum clearance must be maintained between the

bottom of fence and the road surface when gate is in closed position. Gate

openings for double swing gates 12 feet. Provide 3’ 6” deep concrete

foundation must be used for swing gate posts. Gate swings must be designed

with a large arc space for proper operation. Weld hinges to the gate post and

gate. Provide chain for swing gate, and ensure chain is reasonably tight but

easy to remove with the lock. Government will provide lock.

W. Reweave bottom fabric which includes 500 LF of existing fence fabric to

horizontal post, or wire. Use the same standards as new fence line using 9-

gauge tension wire.

X. Access road will begin south of detention pond, indicated on Section 3-15, and

tie into existing asphalt near church. 3” of ¾” stone to be compacted to 95%

for ASTM standards. Compact every 2” lifts. Two foot shoulders for each side

which will make a total of 16’ width. 2” of asphalt binder course, and 1.5” of

asphalt wearing surface for a width of 12’. The difference from wearing

surface, and aggregate shoulder should not exceed more than a 1” drop off in

height. Asphalt compaction of 94lbf, plus or minus 2lbf. Earthwork will be

needed to ensure asphalt is no more than 2” above existing surface. Asphalt

will be roughly 1,050LF. ALDOT sign R5-11, Authorized Vehicles Only, will be

placed at both ends of new street. On same pole, street name plate will be

added on both poles. Contractor will provide all four signs, posts, and concrete

to set posts. See drawings for more information. Base Civil Engineer will

determine street name at a later time.

Y. Access road will begin behind CE warehouse, and travel east to CE aggregate

pit. 4” of ¾” stone, and 2” of 8910 to be compacted to 95% for ASTM

standards. Compact every 2” lifts. 4” of asphalt binder course, and 2” wearing

surface with a 12’ width. The difference from wearing surface, and existing

surface should not exceed more than a 1” drop off in height. Asphalt

compaction of 94lbf, plus or minus 2lbf. Asphalt will be roughly 875LF.

Earthwork will be needed. ALDOT sign R5-11, Authorized Vehicles Only, will

be placed at beginning of new street. On same pole, street name plate will be

added. Contractor will provide both signs, post, and concrete to set post. See

drawings for more information. Base Civil Engineer will determine street name

at a later time.

Z. Base must stay secured at all times. Contractor must not demo the existing fence

unless plans are in place to install new fence in its place same day. Contractor

will not leave worksite for the day unless boundary fence is still connected.

AA. The tree clearing, and fence replacement of the eastern most fence line will be

conducted on Birmingham Airport Authority property. Any crews that will be a

part of this portion of the project must have a STA badge from the Airport. Each

badge will cost $65. This badge will include the contractor taking three airfield

courses. These courses are offered at the BAA badge office. Contractor must set

up time with BAA through project COR to take courses, and register their

employees.

1.3 ADDITIONAL BID ITEM

A. Install 180 linear feet of vehicle cabling to secure secondary gates near building

40. Install 16 bollards to help secure the new cabling. Cabling and bollards will

follow UFC 4-022-03 standards. See Section 3-5, and map for indicated area.

1.4 CONTRACT RESPONSIBILITIES

A. The work is one contract bid package that will be contracted directly with the

CONTRACTING OFFICER.

B. Responsibilities of CONTRACTOR:

1. Except as specifically noted, provide and pay for:

a) Labor, materials, and equipment.

b) Tools, construction equipment andmachinery.

c) Other facilities and services necessary for proper execution and

completion of work (locating and flagging underground utilities, etc.)

d) Independent testing lab to do all materials and quality control testing

if required.

e) “Provide” means to furnish and install, complete and ready for

operation.

2. Give required notices.

3. Comply with codes, ordinances, rules and regulations, orders and other

legal requirements of public authorities which bear on performance of

work.

4. Promptly submit written notice to CONTRACTING OFFICER of observed

variance of contract documents from legal requirements.

a) Assume responsibility for work to be contrary to such

requirements, without notice.

b) Appropriate modifications to Contract Documents will adjust

changes necessary due to legal requirements.

5. Enforce strict discipline and good order among employees. Do not

employ on work:

a) Unfit persons.

b) Persons not skilled on assigned tasks.

6. Furnish all submittals (including shop drawings, catalog cuts, brochures,

test reports, progress schedules, estimates and general correspondence)

promptly and on time to be approved before starting the work for which

submittals are required.

C. Responsibilities of CONTRACTINGOFFICER:

1. CONTRACTING OFFICER to review materials testing lab qualifications

submitted by the CONTRACTOR. This responsibility is generally

delegated to the Base Civil Engineer Office.

2. Construction Drawings.

1.5 CONTRACTOR USE OF PREMISES

A. Confine operations at site to areas permitted by:

1. Law

2. Ordinances

3. Permits

4. Contract Documents

5. Existing Staging Areas

6. Where directed by CONTRACTING OFFICER.

B. Do not unreasonable encumber site with materials or equipment.

C. Assume full responsibility for protection and safekeeping of products stored on

premises.

D. Move any stored products which interfere with operations of CONTRACTING

OFFICER or other CONTRACTORS engaged in work for the CONTRACTING

OFFICER.

E. Use of Site: Government will occupy the site during construction. Coordinate so

that the least amount of disruption is caused, that traffic and personnel safety is

maintain.

F. CLEANLINESS IS THE ESSENCE OF QUALITY. Keep site clean. Remove

waste material from the site weekly. Failure to comply will result in notice to

clean site given by CONTRACTING OFFICER; if not cleaned within twelve (12)

hours from time of notice, the CONTRACTING OFFICER will clean the site and

charge the CONTRACTOR $200.00/hour for this work.

1.6 SUBMITTALS

A. Approval for all materials must be given before installation.

B. No work can be started until such work has been discussed and reviewed by the

CONTRACTING OFFICER

C. Test reports shall be checked by the Base Civil Engineer and the

CONTRACTING OFFICER to insure compliance with the Specifications.

D. Any deviations will be made known to the CONTRACTOR and

CONTRACTING OFFICER.

E. It is the CONTRACTOR’S responsibility to achieve compliance with the

Specifications.

PART 2 PRODUCT SUBMITTAL

2.1 Fence fabric (wire gauge)

2.2 Fence post

2.3 Extension arm

2.4 Barbed wire

2.5 Fence bracing rod and turnbuckles

2.6 Fasteners/Weld

2.7 Concrete

2.8 Rebar

2.9 Bollard

2.10 Steel culvert grate/other option

2.11 Vehicle Cable

2.12 Riprap

2.13 Geotextile fabric

2.14 Tree Trimming equipment (Approval from FAA)