A04_Statement_of_Work_-_SOW_-_FOFR_Boardwalk.pdf

FORT FREDERICA NATIONAL MONUMENT

BOARDWALK REPLACEMENT

Statement of Work (SOW)

National Park Service (NPS)

1. Project Background and Justification

The National Park Service (NPS) is replacing an existing elevated wood boardwalk structure to address deterioration, improve visitor safety, and provide continued accessibility. The boardwalk is part of the visitor circulation system and provides an accessible route over a dry moat that defines the historic townsite boundary.

Replacement of the existing boardwalk provides the National Park Service the opportunity to improve life-safety features and construction practices consistent with current International Building Code requirements, including updated loading capacity and compliant guardrail and handrail configurations, while maintaining its role as an accessible route and interpretive feature.

2. Scope

The Contractor shall provide all labor, materials, equipment, and transportation necessary to complete the Work, consisting of:

1. Demolition, removal, and disposal of the existing elevated wood boardwalk structure, including all decking, framing members, guardrails, and associated components. Disposal shall occur outside of the Park boundary in accordance with Local, State, and Federal regulations.

2. Installation of reinforced concrete footings at locations and dimensions indicated in the Contract Documents.

3. Construction of a new elevated wood boardwalk structure, including framing, decking, and all structural components, in accordance with the Contract Documents.

4. Installation of guardrail systems along the full length of the boardwalk.

5. Construction of a continuous accessible route across the boardwalk in accordance with applicable standards.

6. Protection of adjacent resources and restoration of all disturbed areas to pre-construction condition.

3. Tasks

3.1 Demolition

1. Contractor shall demolish and remove the existing wood boardwalk structure in its entirety, including all decking, framing members, posts, guardrails, and associated components.

2. Contractor shall remove all existing posts and associated concrete encasements to the limits indicated in the Contract Documents.

3. Contractor shall perform demolition in a controlled manner to prevent damage to adjacent resources, including the dry moat and surrounding landscape.

4. Voids resulting from removal of posts and concrete encasements shall remain open for reuse where indicated in the Contract Documents. Contractor shall not backfill these areas unless directed by the Contracting Officer.

5. Contractor shall stage, contain, and remove all demolition debris from the site. All debris shall become the property of the Contractor and shall be disposed of outside of the Park boundary in accordance with Local, State, and Federal regulations.

6. Contractor shall maintain site control and implement measures necessary to ensure visitor and employee safety throughout demolition activities.

3.2 Footings

1. Contractor shall install reinforced 4000 psi concrete footings to support elevated boardwalk vertical supports.

2. Vertical supports at reinforced concrete footings shall be installed with approved pre-manufactured post base systems attached to J-Bolt anchors.

3. Use of pre-manufactured post base systems shall not modify the required footing dimensions or increase ground disturbance beyond that specified herein.

4. Footings shall be constructed in cylindrical excavations bored to 12 inches in diameter and 12 inches in depth.

5. Existing voids from removed posts shall be reused where indicated to limit new ground disturbance. Contractor shall not backfill these areas unless directed by the Contracting Officer.

6. Each footing shall consist of a full-depth concrete placement that extends to finished grade.

7. Contractor shall provide welded wire mesh (WWM) reinforcement within each footing. WWM shall be formed into a cylindrical configuration approximately 9 inches in diameter and 8 inches in height and shall be supported on 2-inch chairs to maintain proper clearance from the bottom of the excavation.

8. Vertical supports shall be centered on each footing and installed using approved post anchorage methods.

9. Contractor shall place and consolidate concrete to ensure full bearing and eliminate voids within each footing.

3.2.2 Post Anchorage

1. Vertical supports at reinforced concrete footings shall be installed using pre-manufactured post base systems with compatible threaded J bolt post anchors.

2. For site-poured concrete footings, post anchors shall be wet set in the concrete at the time of placement and aligned to receive the post base.

3. For pre-cast footing systems, post anchors shall be integrated or installed in accordance with manufacturer requirements.

4. Post bases and anchors shall be installed plumb, aligned, and centered on the footing to ensure proper load transfer.

3.3 Ground Contact Boardwalk Construction

1. Contractor shall construct boardwalk segments in full ground contact using preservative-treated wood members supported by posts embedded in concrete.

2. Posts shall be nominal 4x4 preservative-treated lumber spaced at 8 feet on center and set plumb and aligned.

3. Existing voids from removed posts shall be reused where indicated to limit new ground disturbance. Voids may be widened as necessary, not to exceed 12 inches in diameter, to allow for concrete embedment of posts.

4. Posts shall be embedded in concrete to provide stable bearing and prevent movement. Concrete shall fully encase the embedded portion of each post.

5. Each line of posts shall support two (2) nominal 2x6 preservative-treated beams spanning the width of the boardwalk. Beams shall be installed in direct ground contact and shall be continuous across each span.

6. Beams shall be attached to posts with two (2) through-bolts at each connection.

7. Joists shall be nominal 2x8 preservative-treated lumber and shall bear on the 2x6 beams.

8. Joists shall be spaced at 16 inches on center. Contractor shall adjust spacing as necessary to accommodate equal layout across the width of the boardwalk.

9. Framing members shall be installed to provide continuous support for decking and to maintain a uniform walking surface.

10. Decking shall be installed to provide a smooth, continuous walking surface suitable for an accessible route.

11. Contractor shall ensure finished elevations, alignment, and transitions provide a continuous path of travel without abrupt changes in elevation.

3.4 Elevated Boardwalk Construction

1. Supporting beams shall consist of double nominal 2x8 preservative-treated members.

2. Beams shall be supported by perimeter posts and interior bearing posts to establish continuous load paths.

3. Interior bearing posts shall be spaced at intervals not exceeding 4 feet on center.

4. Perimeter posts supporting the guardrail system shall be spaced at intervals not exceeding 8 feet on center.

5. Posts supporting beams shall be minimum nominal 6x6 preservative-treated lumber.

6. Posts shall be notched to provide full bearing for beam members. For double 2x8 beams, the notch shall be 7-1/4 inches in height and 3 inches in depth measured from the face of the post. Beam members shall bear fully and uniformly on the notched surface.

7. Beam-to-post connections shall include not less than two (2) 1/2-inch diameter Type 316 stainless steel through-bolts with Type 316 stainless steel washers and nuts at each connection.

8. All cuts, notches, and field modifications shall be treated with a preservative compatible with pressure-treated lumber.

9. Framing members shall be installed to provide continuous support for decking and to maintain a uniform walking surface.

10. Decking shall be installed to provide a smooth, continuous walking surface suitable for an accessible route.

11. Contractor shall ensure finished elevations, alignment, and transitions provide a continuous path of travel without abrupt changes in elevation.

3.5 Decking

1. Contractor shall install decking using nominal 5/4 x 6 preservative-treated lumber installed perpendicular to the joists.

2. Decking shall extend beyond the outer joists with a 3 ½” overhang at each edge of the boardwalk.

3. Deck boards shall be fastened with two (2) 3-inch coated deck screws at each joist.

4. Decking shall be installed to provide a smooth, continuous walking surface suitable for an accessible route.

3.6 Guardrail

1. Contractor shall install a two-rail guardrail system along the full length of the boardwalk.

2. Guardrail height shall be 42 inches measured from the finished walking surface to the top of the guardrail.

3. Guardrail posts at ground contact boardwalk segments shall be nominal 4x4 preservative-treated lumber.

Guardrail posts at elevated boardwalk segments shall be nominal 6x6 preservative-treated lumber. Posts shall be installed plumb and aligned.

4. The upper rail shall consist of nominal 2x4 preservative-treated lumber installed flush with the top of the posts.

5. The intermediate rail shall consist of nominal 2x4 preservative-treated lumber installed 14 ½” below the top rail.

6. A top cap shall be installed over the guardrail system consisting of nominal 2x6 preservative-treated lumber.

7. At locations where the top cap spans between 6x6 posts, the top cap shall be constructed from nominal 2x lumber ripped to 8 inches in width and securely fastened to the tops of the posts.

8. All guardrail components shall be securely fastened to provide a rigid assembly capable of resisting imposed loads.

4.0 Requirements

1. All lumber in contact with soil or embedded in concrete shall be preservative treated for ground contact in accordance with applicable industry standards. All other lumber shall be preservative treated for exterior use.

2. All fasteners, connectors, bolts, washers, and hardware shall be corrosion-resistant and suitable for exterior and ground contact applications. Hardware in contact with preservative-treated wood shall be compatible to prevent corrosion and deterioration. Through-bolts, washers, and nuts specified in the Work shall be Type 316 stainless steel.

3. All cuts, notches, and field modifications to preservative-treated lumber shall be field-treated with a preservative compatible with the original treatment.

4. Concrete shall be placed in a manner that prevents segregation and ensures full consolidation. Concrete shall be free of voids and shall provide full bearing at all support locations.

5. Contractor shall verify all dimensions, layout, and field conditions prior to construction. Any discrepancies shall be brought to the attention of the Contracting Officer prior to proceeding with the Work.

6. Work shall be performed in a manner that minimizes ground disturbance and protects adjacent resources.

7. Contractor shall perform all Work in accordance with best practices for construction within a historic site, taking care to avoid unnecessary disturbance, damage, or alteration to surrounding features.

8. Contractor shall maintain site control and implement measures necessary to ensure visitor and worker safety throughout the Work.

6.0 Resource Protection

6.1 Cultural Resource

The boardwalk is a non-historic structure located within a culturally significant, maintained landscape that reflects the historic townsite. The alignment of the boardwalk conveys the location of the original entry bridge into the townsite and shall be preserved throughout the Work.

1. Contractor shall confine construction access, equipment staging, and material storage to previously disturbed areas and areas immediately adjacent to the existing boardwalk alignment to the maximum extent practicable.

2. Ground disturbance shall be limited to the existing boardwalk footprint and areas within 10 feet of the existing perimeter. Contractor shall not disturb areas outside of this limit without written approval from the Contracting Officer.

3. ew excavations and borings shall be limited to those required for structural support. Additional borings shall not exceed 12 inches in diameter and shall be minimized to the greatest extent practicable.

4. Archeological monitoring will be provided by the National Park Service. Contractor shall notify the Contracting Officer’s Representative (COR) a minimum of 72 hours prior to performing any new borings to allow for monitoring.

5. Contractor shall take all necessary precautions to avoid damage to adjacent cultural resources and sensitive landscape features.

6. In the event that cultural materials, archeological resources, or human remains are encountered during construction, Contractor shall immediately stop work in the vicinity of the discovery and notify the Contracting Officer. Work shall not resume in the affected area until directed by the Contracting Officer.

6.2 Natural Resources

1. Any disturbed turf or ground surface within the work zone shall be restored by the Contractor to pre-construction condition. Restoration shall include grading to match existing contours and seeding of disturbed areas. Seeded areas shall be stabilized to prevent erosion until vegetation is established.

2. Contractor shall not disturb, harass, or otherwise interfere with wildlife. Work shall be conducted in a manner that avoids impacts to wildlife and their habitats.

3. Contractor shall stage, contain, and remove all demolition and construction debris from the site. All debris shall become the property of the Contractor and shall be disposed of outside of the Park boundary in accordance with Local, State, and Federal regulations.

7.0 Deliverables

1. Contractor shall provide material submittals for all major components, including lumber, fasteners, connectors, and hardware, for review and approval prior to installation.

2. Contractor shall provide a site-specific safety plan prior to commencement of Work. The plan shall address, at a minimum, site control, visitor safety, worker safety, and hazard mitigation associated with demolition, excavation, and construction activities.

3. Contractor shall prepare Activity Hazard Analyses (AHAs) for all high-risk activities, including but not limited to demolition of the existing boardwalk, excavation and concrete placement for footings, installation of structural framing, and use of wheeled or mechanized equipment. AHAs shall address site control, visitor interface, material handling, and work within a culturally sensitive environment.

4. Contractor shall provide a one (1) year workmanship warranty for all Work performed under this contract. The warranty period shall begin upon final acceptance of the Work by the Government.

31°13'25.02"N 81°23'24.22"W rsdaniels Polygon rsdaniels Line

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TOTAL PRICE FOR ALL OPTIONS BASE PRICE (Contract Line Item Number 9)-----------

TOTAL BASE PRICE (Contract Line Item Number 1 through 7-----------------------------

Option 1: N/A

Total Price

Demolition of Existing Boardwalk

Concrete Footing Placement

Decking

Structural Framing

Guardrail

General Conditions

Profit

Overhead

Project Title: FOFR Moat Boardwalk

Notice: Offerors are required to submit, a minimum, an offer that conforms to the solicitation documents with pricing for Base line items and all option line items. Failure to do so may render the proposal unacceptable. On lump-sum line items, provide the total price only. For all unit-priced line items, provide the unit price and the extended total price. If no specific line item exists for a portion of the work, include the costs in a related item. In case of error in calculation of extended prices, the unit price governs. In case of error in summation, the total of the corrected amounts govern. Round totals and extended prices to whole dollars.

Contract

Line Item

Number

(CLIN)

Unit of

Measure Contract Line Item (CLI) Title Quantity Unit Price

Contract Price Schedule National Park Service (NPS)

Solicitation : TBD

Park: FOFR

PMIS Number: 327467

Developed Area: