Bujumbura LCP SOW_Final.pdf

General

Design Drawings and Specifications

Project Management and Engineering (PME) will provide the design package and specifications for the contractor to build and install the infrastructure for the handholes, and underground conduit as outlined in the Bujumbura 21030 LCP design package document.

It is the contractors responsibility to review and understand the work involved and what is required to complete the project. If any error or inconsistencies are found on the drawings, contractor will bring these to the attention of post and/or pme.

Criteria

Contractor shall have a resident registered/certified/licensed civil engineer or graduate architect on site or a qualified construction supervisor at all times, who should have at least two years’ experience in similar work and can speak, write and read English at a moderate or higher level.

Contractor shall submit the curriculum vitae of the resident engineer as part of the proposal

Contractor will provide a detailed project schedule, with start and end dates for work activities and stating a critical path.

Contractor will provide post with weekly work progress reports and construction schedule updates during the duration of the project.

Post will have final approval of all work performed by contractor.

Materials

PM-Provided materials

PME will provide all materials for this design package, unless noted otherwise within the document.

Codes and guidelines

All work shall be accomplished as per the following codes and guideline:

• 2018 International Fire Code (IFC) and 2020 National Electrical Code (NEC)

• DS Security Engineering application guidelines

• 1990 Americans with Disabilities Act

• ASCE/SEI 7-16 minimum design loads and associated criteria for buildings and other structures.

Design criteria

1.d.1. Risk category

1. Office and utility buildings iii

2. All other buildings ii

1.d.2. Wind criteria

1. Ultimate design wind speed

a. Risk category iii 61 m/s 136.46 mph

B. Risk category ii 57 m/s 127.51 mph

Commented [JF1]: Please clarify. It looks like you are not providing anything except the design.

Commented [VD2R1]: PME will be providing all material (e.g. conduit, hand holes, etc.) unless noted otherwise in this SOW (e.g. material to fix concrete, backfill)

Commented [JF3]: Please provide as an attachment

Commented [VA4R3]: This reference can be deleted.

2. Exposure c

1.d.3. Seismic criteria

1. Mce spectral response accelerations (mcer)

A. Short period, s/s 1.63

B. 1-second period, s/1 0.77

2. Seismic importance factor

A. Office and utility buildings 1.25

B. All other buildings 1.00

3. Site class d

4. Design spectral response coefficients

A. Short period, s/ds 1.08

B. 1-second period, s/d1 0.87

5. Seismic design category d

6. Seismic requirements for non-structural components

A. Component importance factor, i/p 1.0

Site and safety requirements

1.e.1. Site installation oversight

Installation oversight, supervision and escorting is the responsibility of post in accordance with any site-specific security directives.

Site preparation

• Contractor will be responsible for cleaning and removing all debris from the embassy compound to the nearest authorized dump facility (authorized by the town). The areas affected by contractor's work must be returned back to pre-construction conditions after the work is completed. (e.g. grass, gravel, sidewalk, landscaping, asphalt etc.)

• Contractor shall limit the site disturbance to a maximum 6 feet (1829 mm) on each side of trench. Excavated material will be placed next to the excavated area to be used as select backfill.

• A construction laydown area. If needed, will be the responsibility of post to coordinate.

Site safety

• Contractor must clearly mark all excavation work zones with warning signs and yellow plastic safety tape fixed to wood posts. Contractor must comply with all applicable safety standards to protect the embassy compound employees, the public and contractor workers from injuries and accidents. Contractor will be held liable for injuries or accidents sustained due to negligence by contractor during this project.

Protection of the embassy compound equipment

• Contractor must make sure that the embassy compound equipment and property in the work zone or surrounding areas are protected to prevent them from getting damaged during construction. Should any repair or change have to be done due negligence by contractor or its workers, contractor will be responsible for the costs incurred in the repair.

• Contractor must keep all debris and excavated material clear of service network drains, covers and sumps near the trenches, to prevent clogs or damage.

Infrastructure support system

Handhole/underground conduit system

Trench

• Contractor will verify existing utilities and provide as-built drawings prior to excavating of trench. If the excavation work interferes with drain or piping, the contractor shall inform post and provide suitable protection for these structures prior to proceeding with the work. If excavation cannot proceed due to existing obstacles then post will provide a new conduit route.

• All trenches will be excavated to the required depth according to specifications shown on drawings.

Handhole (with drainage)

• Lockable handholes will be installed by the contractor as specified on detail drawings.

• Contractor will make hole penetrations to the existing manholes according to number of conduits entering and exiting the manhole.

• The base of the handholes shall be placed over a base of crushed non-porous rock or gravel and sand. The gravel size shall not exceed 1/2 inch (13mm).

Conduit

• All existing conduits shall be left in place unless noted otherwise on the design drawings.

• Under grass, dirt, sidewalk or asphalt, install schedule 80 pvc conduit 24 inches (610mm) below finish grade to the top of the conduit as specified on the drawings.

• All underground 90-degree bends with a 12 inch (305mm) radius shall be made with pre-fabricated 90 degree sweeping bend.

• All underground conduits shall be converted from schedule 80 pvc to rgs above ground using pvc to rgs couplers.

• Contractor shall leave a pull line in all installed conduit paths.

• Contractor will install the conduit from the handhole to handhole or the exterior junction box as shown on drawings.

• All conduit stubbed and capped above the ground shall be at a height of no less than 12"

(305mm) from the ground. When the stubbed conduit is near a wall or pole it must be at a least 2" (51mm) from the wall or pole to allow for box mounting.

• Junction boxes Contractor will install junction boxes in all locations shown on drawings.

Concrete

• Contractor will provide labor and materials to repair concrete where disturbed. Concrete color, type and thickness shall match existing.

• Concrete used shall be 25mpa.

• Concrete may not be poured if weather conditions do not permit.

• Approval from post must be obtained 24 hours prior to pouring of concrete. Post and contractor crew supervisor must be present during the pouring of concrete.

• Concrete placement

• Comply with requirements and with recommendations in aci 304r for measuring, mixing, transporting, and placing concrete.

• Consolidate concrete by mechanical vibrating equipment supplemented by hand-spading, rodding, or tamping. Use equipment and procedures to consolidate screed pavement surfaces with a straightedge and strike off. Commence initial floating using bull floats or darbies to form an open textured and uniform surface plane before excess moisture or bleed water appears on the surface. Do not further disturb concrete surfaces before beginning finishing operations or spreading dry-shake surface treatments.

Concrete finishing

• General: wetting of concrete surfaces during screeding, initial floating, or finishing operations is prohibited.

• Float finish: begin the second floating operation when bleed-water sheen has disappeared and the concrete surface has stiffened sufficiently to permit operations. Float surface with power-driven floats, or by hand floating if area is small or inaccessible to power units. Finish surfaces to true planes. Cut down high spots and fill low spots. Refloat surface immediately to uniform granular texture

• burlap finish: drag a seamless strip of damp burlap across float-finished concrete, perpendicular to line of traffic, to provide a uniform, gritty texture.

• medium-to-fine-textured broom finish: draw a soft bristle broom across float-finished concrete surface perpendicular to line of traffic to provide a uniform, fine-line texture.

• medium-to-coarse-textured broom finish: provide a coarse finish by striating float-finished concrete surface 1/16-inch (1.6mm) to 1/8-inches (3mm) deep with a stiff-bristled broom, perpendicular to line of traffic.

Soil materials

• Contractor will provide labor and materials for soil where distributed.

• Select backfill: ASTM d 2487 soil classification groups sw, sp, and sm, or a combination of these groups; free of rock or gravel larger than 3-inches (75mm) in any dimension, debris, waste, frozen materials, vegetation, and other deleterious matter.

• (asphalt/concrete) base course: naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; astm d 2940; with at least 95 percent passing a 1-1/2-inch (40mm) sieve and not more than 8 percent passing a 1/4-inch (6.4mm) sieve.

• Base gravel: naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; astm d 2940; except with 100 percent passing a 1-inch

(25mm) sieve and not more than 8 percent passing a 1/4-inch (6.4mm) sieve.

• Sand cushion: astm c 33; fine aggregate, natural, or manufactured sand.

• compaction of soil backfills and fills

• Lace backfill and fill soil materials in layers not more than 8-inches (203mm) in loose depth for material compacted by heavy compaction equipment, and not more than 4-inches

(102mm) in loose depth for material compacted by hand-operated tampers.

• Place backfill and fill soil materials evenly on all sides of structures to required elevations, and uniformly along the full length of each structure.

• Compact soil materials to not less than the following percentages of maximum dry unit weight according to astm d 1557:

o under structures, building slabs, steps, and pavements, scarify and re-compact top 11-inches (280mm) of existing sub grade and each layer of backfill or fill soil material at

95 percent.

o under walkways, scarify and re-compact top 6-inches (152mm) below sub grade and compact each layer of backfill or fill soil material at 92 percent.

o under lawn or unpaved areas, scarify and re-compact top 6-inches (152mm) below sub grade and compact each layer of backfill or fill soil material at 85 percent.

o for utility trenches, compact each layer of initial and final backfill soil material at 85 percent.