Attachment_0001_DB_SOW_Meadowood_Sensory_Nature_Trail.pdf

A/E/C Services Statement of Work

Design- Build (DB)

MEADOWOOD SPECIAL RECREATION MANAGEMENT AREA

New Sensory Nature Trail, Enchanted Pond Outflow Culvert Replacement, &

Mustang Trailhead Improvements

BLM Lower Potomac Field Station 10406 Gunston Road Lorton, Virginia 22079

UNITED STATES DEPARTMENT OF THE INTERIOR

Bureau of Land Management National Operations Center

Architecture & Engineering Branch (OC-671)

13 March 2026

Meadowood Special Recreation Management Area

BLM Eastern States Design-Build Statement of Work

13 March 2026

CONTENTS

1 OVERVIEW 5

1.1 Project Background and Scope

1.2 Project Scope & Salient Features

1.2.1 Sensory Nature Trail

1.2.2 Enchanted Pond Outflow Culvert

1.2.3 Mustang Trailhead Improvements

1.3 Design-Build Contractor Scope

1.4 Government Furnished Information and Materials

2 GENERAL PROJECT REQUIREMENTS 14

2.1 Progress Payments

2.1.1 Design Phase:

2.1.2 Construction Phase:

2.2 Project Schedule

2.2.1 General:

2.2.2 Purpose:

2.2.3 Software:

2.2.4 Schedule Development:

2.2.5 Project Schedule Updates

2.2.6 Progress Payments:

2.3 Forms

3 DESIGN PARAMETERS 17

3.1 General

3.2 Compliance & Authority Having Jurisdiction (AHJ)

3.3 Geotechnical Report

3.4 Survey

3.5 Site Design

3.6 Sensory Trail Design

3.7 Building Design (Trail Entrance Structure)

3.8 Electrical Design

4 DESIGN DELIVERABLES & SERVICES 21

4.1 Overview

4.2 Project Administration & Management Services

4.3 Pre-Design (PD) & Schematic Design (SD) Deliverables & Services

4.3.1 General / All Disciplines (PD/SD)

4.3.2 Site, Survey & Landscape (PD/SD)

4.3.3 Civil Engineering (PD/SD)

4.3.4 Landscape Architecture (PD/SD)

4.3.5 Architecture (PD/SD)

4.3.6 Structural Engineering (PD/SD)

4.3.7 Plumbing Engineering (PD/SD)

4.3.8 Electrical Engineering (PD/SD)

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4.4 Design Development (DD) & Construction Document (CD) Deliverables & Services

4.4.1 General / All Disciplines (DD/CD)

4.4.2 Civil Engineering (DD/CD)

4.4.3 Landscape Architecture (DD/CD)

4.4.4 Architecture (DD/CD)

4.4.5 Structural Engineering (DD/CD)

4.4.6 Electrical Engineering (DD/CD)

4.5 Construction Administration

5 CONSTRUCTION REQUIREMENTS 25

5.1 Overview

5.2 Environmental and Sustainability Requirements

5.2.1 Sustainability Requirements:

5.2.2 Minimize Construction Impacts:

5.2.3 Air and Water Pollution Control:

5.3 Schedule of Values

5.4 Construction Support

5.4.1 Staging Areas

5.4.2 Structures

5.4.3 Construction Zones

5.4.4 Parking of Construction Vehicles

5.5 Submittals During Construction

5.5.1 Applicability

5.5.2 Construction Submittal Types:

5.5.3 Government Review of Construction Submittals

5.5.4 Submittal List

5.5.5 Use for Construction

5.6 Construction Coordination

5.7 Construction Photographic Documentation

5.8 Construction Quality Control

5.9 Working Hours Restrictions

5.10 Temporary Services

5.10.1 Fire Protection Equipment

5.10.2 Vehicles and Equipment

5.10.3 Spark Arresters

5.10.4 Smoking

5.10.5 Welding

5.10.6 Electricity and Lighting

5.10.7 Telephone

5.10.8 Sanitary Facilities

5.11 Access

5.12 Preservation of Adjacent Features

5.13 Existing Utilities

5.14 Hauling Restrictions

5.15 Accident Prevention

5.15.1 Accident Prevention Program

5.15.2 Accident Reporting

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5.15.3 Quality Assurance

5.15.4 Accident Prevention Products

5.15.5 Training

5.16 Temporary Controls

5.16.1 Housekeeping

5.16.2 Weather Protection

5.17 Field Engineering

5.18 Project Close-Out

5.18.1 Project Record Drawings

5.18.2 As-Constructed Drawings

5.18.3 Posted Operating Instructions

5.18.4 Cleaning

5.18.5 Final Inspection

5.18.6 Operation and Maintenance Data

5.19 Substantial Completion and Final Inspection

6 DELIVERABLE DETAILS 35

6.1 Format Requirements

6.2 Distribution

6.3 Communication

7 PERIOD OF PERFORMANCE & SCHEDULE 37

7.1 Period of Performance Summary

7.2 Initial Conference Call

7.3 Kickoff Meeting and Site Visit at Meadowood

7.4 Site Survey, Geotechnical, and Schematic Design Studies SD1

7.5 Schematic Design Documents SD2

7.6 100% Design Development Documents

7.7 50% Construction Documents

7.8 100% Draft Construction Documents

7.9 Final Construction Documents

7.10 Construction

7.11 As-Constructed Drawings

8 SUBMITTALS AND MEETINGS 39

8.1 Design Submittals

8.2 Progress Meetings

8.2.1 Progress Meeting Milestones

8.2.2 Design Phase Progress Meetings

8.2.3 Pre-Construction Meeting

8.2.4 Construction Phase Progress Meetings

8.2.5 Meeting Participation

8.3 Quality Control

8.4 Required Reports

Design-Build Statement of Work

13 March 2026

1 OVERVIEW

1.1 PROJECT BACKGROUND AND SCOPE

The Bureau of Land Management (BLM) owns the Meadowood Special Recreation Management Area (Meadowood) in Northern Virginia. Meadowood is managed by the BLM’s Lower Potomac Field Station, located on the area’s premises at 10406 Gunston Road, Lorton, Virginia 22079.

The BLM has identified three separate Task Areas at Meadowood for which the Design-Build Contractor (DBC) will be responsible for providing design and construction services. The aerial image below is for reference only – the DBC shall be responsible for ensuring that all work will be in compliance with the project extents outlined in the attached National Environmental Policy Act (NEPA) approvals.

Reference Aerial Image showing the location of the three separate projects.

1. Meadowood Sensory Nature Trail

The Meadowood Sensory Nature Trail, to be located at the BLM’s Meadowood Special Recreation Management Area (Meadowood), will invite visitors of all ages to explore nature in a way that is specifically designed for individuals with neurodivergent conditions (such as Autism Spectrum Disorder), sensory processing disorders, and intellectual disabilities.

This unique trail will be the first dedicated sensory nature trail on Federal lands and will offer a welcoming environment where everyone can connect with nature in a sensory-friendly setting – making it the perfect place for families and individuals seeking a calm and engaging outdoor experience.

The Sensory Nature Trail will engage the senses of individuals with autism and other developmental disabilities, helping them connect more fully with nature. Designed with

Design-Build Statement of Work

13 March 2026 accessibility in mind, it will offer a sensory-friendly experience that encourages a deeper interaction with the outdoors. The proposed trail will offer a variety of opportunities where visitors can run, jump, climb and move while experiencing the sights, sounds, textures, and smells of nature.

The Sensory Nature Trail is intended to encourage moments of reflection, inviting guests to pause, think and meditate. It will foster creativity by allowing visitors to design, explore, and construct in a safe, welcoming environment. The trail will serve as a dynamic outdoor classroom, where visitors can learn, listen, coordinate, and share experiences.

The Sensory Nature Trail is largely inspired by the existing Autism Nature Trail (ANT) located at Letchworth State Park in New York. As such, it is strongly encouraged that the DBC conduct an in-person site visit to the ANT and meet with the founders and designers to identify key design considerations and concepts to incorporate into the Meadowood Sensory Nature Trail. In addition, the DBC will conduct public outreach and host an on-site public engagement meeting to further define the needs and requirements for the Sensory Trail.

The proposed approximately 21.02 acre location for the Sensory Nature Trail within the Meadowood Area has been identified in the attached “Meadowood SRMA Reference Plans” document.

2. Mustang Trailhead Parking Improvements

The existing parking lot at Mustang Trailhead (10702 Harley Rd, Lorton, VA 22079) is undersized and has inadequate turning geometry to serve the special events that take place in the adjacent pavilion and recreation area. These events attract numerous visitors driving several vehicle types such as POV’s, semi-trailers, and horse trailers. The BLM has determined that improvements are necessary to the existing 8.20 acre Mustang Trailhead area to improve trailhead functionality and safety and shall consist of, among other items, upgrading stormwater management, adding public toilets, expanding the parking area, and installing water/electrical utilities. A complete project scope is outlined in Section 1.2.2 and the attached “Meadowood SRMA Reference Plans” document identifies the approximate location for key project scope items.

Reference Aerial Image of Mustang Trailhead

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3. Enchanted Pond Outflow Culvert Replacement

The existing outflow culvert at Enchanted Pond, (Coordinates: 38°40'14.1"N 77°11'29.9"W) which is a twelve-inch corrugated metal pipe, is beyond its service life due to corrosion. The pond outflow is no longer functioning properly causing some localized flooding adjacent to the pond. Proposed work includes excavating and replacing the failed culvert, backfill and provide any necessary repairs to pond embankment, provide positive outlet for culvert and channel stabilization within the immediate area of culvert outlet. A complete project scope is outlined in Section 1.2.3.

Reference Aerial Image of Enchanted Pond Outflow Area

This Statement of Work outlines the design and construction work to be completed by the Design-Build Contractor (DBC).

1.2 PROJECT SCOPE & SALIENT FEATURES

The Project Scope for the three Task Areas outlined in this Task Order shall consist of the following items and shall incorporate the following Salient Features. The DBC is responsible for providing all items in accordance with their associated Salient Features, unless otherwise noted:

1.2.1 Sensory Nature Trail

The Government anticipates that the Sensory Nature Trail Task Area shall include the following items:

1. Walking trail in the areas west/southwest of the existing Enchanted Pond. The Sensory Nature Trail shall incorporate the following Salient Features:

a. Up to approximately one (1) mile in length or as determined feasible within the existing site boundaries.

b. All elements of the trail shall be fully accessible in accordance with Architectural Barriers Act (ABA) standards (e.g., slope, turning radius, trail surface, height of structures, etc.). All Activity Stations and their primary functions shall be fully accessible.

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c. Maintain a minimum trail width of 6’-0”.

d. Trail, trailhead, and access road shall be crushed gravel surface with stone dust on top.

e. Utilize the existing site contours to minimize the need for significant grading efforts and to maintain the natural landscape. A minimum of two stream crossings will be necessary, the DBC shall utilize either a culvert or pedestrian bridge for these stream crossings. See section 3.5 Site Design Parameters for stream crossing requirements. The trail over the stream crossings shall comply with ABA guidelines.

f. DBC shall perform a stream reconnaissance and perform any stream stabilization work to protect the trail integrity along with scour mitigation adjacent to the stream crossing structures.

g. Provide vegetative / natural screening throughout the trail to minimize ambient noise and to allow visitors to enjoy sounds of the natural surroundings. Plant species selection shall consider olfactory sensation and shall be approved by the Government.

h. Utilize materials that are easy to procure and that reduce maintenance needs for on-site Government personnel.

i. Trail shall be constructed as a singular, one-way loop – visitors shall exit the trail at /or next to the same location that they enter the trail. An additional trail shall be added halfway to allow a shortcut back to the exit of the trail / trailhead. A sensory barefoot “alternate” path may be installed in between two or more of the stations.

This path would be braided into the main loop trail and made with various natural materials (e.g., wood, stone, pebbles, sand, etc.). Each time the path braids across the main loop trail, a different material would be used as the trail surface.

j. Additional amenities along the trail may include, but are not limited to interpretive signage, directional signage, benches, tables, swings, guide ropes, natural materials (logs and rocks), bridges, boardwalks, overlooks, writing boards (chalk or wooden), artwork/structures (metal, rock, or wooden), bird blinds, native plants, wildlife habitat infrastructure, etc.

k. Trail elements and amenities shall be constructed using natural materials and finishes that are appropriate and native to the Meadowood SRMA and surrounding natural areas, such as wood, stone, and masonry. Materials such as steel, plastics, or other composites shall be largely avoided unless a specific application requires it and it is approved by the Government.

l. Exposed wood amenities, such as benches, pergolas, and other structures shall be made of high-strength species that are rot-free and treated with an outdoor waterproof stained finishes to prolong element longevity.

m. Contractor will utilize BLM standard environmental colors where practicable and in accordance with Visual Resource Management (VRM) requirements outlined in the project NEPA documents.

2. Six (6) “Activity Stations” dispersed throughout the trail. If the DBC determines that six stations are not feasible due to geographic / spatial limitations, it shall provide the Government with a documented justification for a reduction in the number of stations and shall not proceed with further design until the Government has agreed to the reduced number of stations. Each Activity Station includes a trail junction sign identifying the station name and may have a spur trail off the main trail to the station and a secondary exit spur

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13 March 2026 trail back to the main trail. The Activity Stations are to serve as spaces for visitors to engage with their processing senses. Activity Stations shall provide accessible options and amenities that accommodate physical, cognitive, and sensory needs.

Non-accessible amenities may be provided only when an equivalent, comparably engaging opportunity is also provided in an accessible format for individuals with disabilities. Each station shall have ABA-compliant surfaces, woodchips, grass, or other natural materials where necessary. The DBC shall be responsible for identifying the adequate size for each station based on the survey and each station’s specific needs and equipment.

The following are potential station ideas based on the Government’s initial research and the attached “Sensory Trail Inspiration Imagery and Examples” document, but it will be up to the contractor to identify stations based on their research and design freedom:

a. Classroom Station: Spaces for visitors to learn, attend lessons or classes, and share experiences. The Classroom Station may include items such as seating (benches, tree stumps, rocks, etc.), presentation areas (stages, podiums), a board (chalk or wooden), tables, shelters, shelves, and a general layout that fosters education.

b. Build / Design Station: Starter structures and natural building materials to allow visitors to construct and design small structures such as teepees, forts, houses, stages, platforms, tables, and other unique creations utilizing the available resources and space within the station. The Build / Design Station is intended to foster creativity and allow visitors to engage in hands-on building activities.

c. Senses Station: Collection of commonly found natural items from the surrounding landscape, such as nuts, pinecones, bark, rocks, seeds, sticks, sand, flowers, leaves, etc. that can be touched and smelled, counted and sorted, or classified and categorized. The Senses Station should include open-air structures to house and store these items, as well as benches for sitting. Additional amenities may include a sensory garden and interactive signage, boards, tables, stages, wildlife habitat infrastructure (bug hotels, bird houses, bats boxes, etc.), stationary scopes, and shelves.

d. Play / Active Station: A natural playground area for free play activities, including running, jumping, balancing, and rolling. The Play / Active Station should include accessible play equipment and variations in grading for visitors to interact with.

Examples include items such as balance beams, tunnels, stairs, sloped hills, mounds, slides, climbing equipment, maze paths, steppingstones, pathways, ropes, water station, etc.

e. Reflection Station: Spaces for visitors to pause, rest, and think. The Reflection Station should include seating and spaces laid out in a manner that allow visitors to experience solitude, quiet and physical / visible separation from the primary trail.

Seating would ideally be made of natural material like wood or boulders. Roped swings or hammocks may also be installed. Provide alternate spur trails off the main station to allow an increase in solitude experience.

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f. Music Station: Setting for nature-inspired instruments that visitors can “play” and experience the process of creating rhythms, tunes, and other natural noises. The Music Station shall be laid out in a manner that allows for visitors to “present” and/or “attend” performances via seating, stages, or a combination thereof. The music equipment and stage should be accessible for wheelchairs users.

Instruments and other musical amenities would be made from weatherproof materials. Examples of musical amenities include drums, xylophones, chimes, or cymbals.

g. Pollinator / Herb Garden: The Mustang Trailhead Task Area in this Scope requires the relocation of the existing pollinator garden. This garden may potentially be relocated to serve as a station or ancillary amenity within the Sensory Trail.

h. Other Station: The DBC shall be responsible for identifying other station concepts throughout the Pre-Design and Schematic Design Phase. Additional amenities like signage, benches, swings, native vegetation, artwork, and other infrastructure may be included.

3. Access road from Gunston Road to provide access to trailhead parking lot. The access road shall incorporate the following design considerations:

a. Width adequate for two cars to pass each other, or a pull-off area.

b. Utilize materials that are easy to procure and reduce maintenance needs for on-site Government personnel.

c. Adequate signage (wayfinding and directional signage) to direct visitors towards the parking lot and trail entrance. Signage shall comply with the MUTCD. The Portal sign shall be a Government Furnished Item. All other signage shall be provided by the DBC.

d. Fence or similar continuous structure to block cars from going into the nearby trails, meadow, and pond areas. An equestrian crossing shall be provided that allows horses and riders to access the northwest portion of Mustang Meadows over the access road. The crossing shall be designed in a way that allows the crossing of horses while preventing automobiles to pass through. Additional pedestrian crossing to enter Enchanted Pond may be needed during design phase.

e. Installation of Portal Entrance Sign at the junction of Gunston Road and the trail access road, providing information about the trail, including name, hours, address and other pertinent information. The Portal Entrance Sign base would have a trapezoid rock base (estimated measurements: W:18”-24, H:12, L”:89”) to match the other portal signs across Meadowood SRMA.

4. Parking lot for a minimum of eight (8) passenger vehicles and one (1) full-size commercial bus. The parking lot shall incorporate the following design considerations:

a. The parking area is intended to serve as a dual function as parking for visitors fishing at Enchanted Pond and utilizing the Sensory Trail.

b. Utilize materials that are easy to procure and reduce maintenance needs for on-site BLM personnel.

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c. Ensure adequate turning clearances to allow a full-size commercial bus to pull completely through and loop around without having to reverse.

d. ABA compliance.

e. Adequate signage and pavement markings direct visitors towards the trail entrance would be provided by DBC.

f. Acquire and install kiosk that provides general information to visitors at the parking lot. Kiosk shall consist of the following products, or equal:

1. One (1) RockArt 6x6 1-Panel Kiosk (72 x 48 sign panels) w/ Gable Roof

(no shingles, brown), or Equal.

a. The government would provide DBC with the customized names on the Kiosk.

2. One (1) RockArt 5x5x12h Kiosk Brochure Box Add-On w/ 0.188 thick steel w/ Tamper Resistant Mounting Hardware, mounts to 6x6 kiosk post, or Equal.

g. A fence or similar structure will surround the parking lot to block cars from going into the nearby trails, meadow, and pond.

5. Trail Entrance Structure to denote entrance/exit of the trail. This structure would be located near the start of the sensory trail and visible from the trailhead parking lot. The entrance structure shall incorporate the following design considerations:

a. Allow for both visitors entering and exiting the trail to do so without physically encountering each other.

1. At the entrance of the trail, the following amenities may be added to this structure: kiosk with sensory trail map, benches, open aired shelves, board, etc. The sensory trail map shall be visitor-oriented and developed in a way that is clear, inviting, and visually engaging. The map shall utilize a park-style, colorful, and user-friendly graphic approach suitable for public distribution and on-site display. The map shall be weatherproof.

2. At the exit of the trail the following amenities may be added to this structure: celebration signage, open aired shelves, board (chalk / wooden), etc.

b. Construct structures out of modest, economical materials to reduce cost.

c. Portion of the structure shall be covered to provide visitors with temporary shelter if needed in the event of rain.

d. Structure shall be similar in vernacular and aesthetics to similar other East Coast park structures, including the use of native wood framing, stone, and construction methods.

e. No mechanical or plumbing needs.

f. ABA compliance including height of kiosk.

6. Restroom facilities at trailhead shall include the following design considerations:

a. Restrooms shall consist of an ABA compliant CXT Precast Vault toilet, Double Cascadian and shall be located in a manner that does not distract from the general aesthetics and essence of the trail and trailhead. The Vault Toilet will be provided as Government Furnished Equipment and the DBC shall be responsible for prepping the site for installation in accordance with the manufacturer’s installation instructions. CXT would install the toilets on site and provide us a window of a week before delivery.

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i. Provide excavation, grading, and proper backfill around vault toilet

ii. Provide concrete pad/walkway around vault toilet along with a concrete walkway from the accessible parking to vault toilet.

iii. All aspects of the vault toilet and walkways must follow ABA requirements

b. Provide a manually-operated adult changing table within the Vault Toilet, to be in compliance with ABA requirements and maintain necessary turning clearances inside the unit.

1.2.2 Enchanted Pond Outflow Culvert

The BLM anticipates that the Enchanted Pond Outflow Culvert Task Area shall include the following items:

1. Remove existing pond outflow structure (12” CMP and riser pipe).

a. Existing 12” CMP is approximately 80 feet long and 15 feet below pond embankment.

DBC is responsible for determining trench width for removal of existing structure.

2. Install outflow pipe and riser pipe with conical trash rack. Pipe material shall be Reinforced

Concrete or High-Density Polyethylene

a. DBC shall provide an Engineering report confirming the hydraulic model of the as-built structure will perform with similar hydraulic ratings in comparison with the existing site conditions.

b. Design of the proposed outlet structure shall keep the normal pond water surface elevation at a minimum the same elevation as the top of the existing riser pipe. DBC shall evaluate if pond surface elevation could be raised a maximum of 9 inches above the top of the existing riser pipe. Provide this analysis to the Government to determine the design water surface elevation of the pond.

c. Provide proper backfill and anti-seep collar

3. Provide headwall at pipe outlet for embankment slope stabilization

4. Provide rip-rap at pipe outlet for scour protection

5. Reconstruct channel as necessary to provide positive outlet

6. Seed and straw all disturbed areas

1.2.3 Mustang Trailhead Improvements

The BLM anticipates that the Mustang Trailhead Improvements Task Area shall include the following items:

1. Expand gravel surfaced parking area to accommodate parking for a minimum of 12 horse trailers, 25 POV’s, and 4 semi-trailers

a. Horse trailer parking space shall be a minimum of 65’ L x 14’ W

b. Provide accessible parking meeting ABA requirements

i. ABA parking area shall be concrete

ii. Provide ABA spaces adjacent to the vault toilet and the existing pavilion along with adjacent to the pavilion

iii. Provide ABA accessible path to/from the nearest parking stalls and the vault toilet/pavilion

2. Parking surface shall be crushed gravel, the DBC shall take into account the vehicle types, loads, and turning movements in the design requirements for the gravel pavement typical section and will be responsible for determining section thickness, material requirements, and compaction requirements. Provide adequate space to accommodate equipment

Design-Build Statement of Work

13 March 2026 onloading/offloading for event setup/teardown along with equestrian loading/unloading adjacent to southeast portion of existing pavilion

3. Provide a gravel pad and a 50 amp 120V/240V pedestal receptacle for an office trailer to be utilized for special events at the pavilion, located near Northeast side of existing pavilion

4. Prepare site for “CXT Precast Vault toilet., Double Cascadian” (Vault Toilet will be provided as Government Furnished Equipment)

a. Provide excavation, grading, and proper backfill around vault toilet

b. Provide concrete pad/walkway around vault toilet along with a concrete walkway from the accessible parking to vault toilet.

c. All aspects of the vault toilet and walkways must follow ABA requirements

5. Install water line and provide six (6) water hydrants. Locate 1 hydrant at each corner of pavilion and 1 at each mid span along the long side of pavilion.

6. Install underground electrical around outside perimeter of pavilion

a. Install new 20 Amp 120V each receptacle to be on a dedicated circuit at each pavilion column to support temporary lighting and electrical needs for special events.

7. Remove existing parking area delineators and parking space delineators

8. Provide parking space delineators as needed, provide boulders (or other methods as approved by the Government) for delineation between parking area and remaining site as needed

9. Install one Meadowood SRMA Information Kiosk (Kiosk to be provided as Government Furnished Equipment)

10. Provide signage as needed, signs shall comply with the MUTCD

11. Remove all items associated with the existing pollinator garden. Vegetation may be re-used at the new proposed pollinator garden as outlined in Section 1.2.1, as approved by the Government.

12. Relocate/repair/install site perimeter fencing as needed

13. Design shall adhere to Fairfax County, Virginia – Code of Ordinances, Chapter 124.1

Erosion and Stormwater Management Ordinance

All design elements included within the Scope of Work shall comply with the BLM Guidelines for a Quality Built Environment, First Edition.

The items contained within the Scope of Work shall be located approximately in the location as illustrated in the Reference Site Plans included with this Statement of Work.

1.3 DESIGN-BUILD CONTRACTOR SCOPE

The DBC shall be responsible for the design and construction of the Scope outlined in this Task Order, including all associated site and utility work unless otherwise noted.

The work will include, but may not be limited to, the following:

• Evaluate the Government Requirements and Project Scope / Salient Features.

• Review existing site information and data.

• Upon award, provide schedule of work, with milestone submittal dates indicated. Coordinate proposed milestone dates with the Government.

• Prepare Topographical Surveys and Geotechnical Reports.

• Design site, site utilities, buildings and foundation systems.

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• Organize and host public engagement meeting on site.

• Submit DB Design Developments and DB Construction Documents for review and approval, as required per milestone dates outlined in the design schedule.

• Provide schedule of construction work. Coordinate proposed milestone dates with Government.

• Secure work area and provide for continued access to the recreation area as technically feasible and safe. Coordinate with the Government regarding which portions of the facility will be accessible to the public throughout the construction phase.

• Construct project.

• Create and provide Operations and Maintenance (O&M) manuals.

• Provide Project Record documents and As-Constructed drawings including utility supply ratings.

1.4 GOVERNMENT FURNISHED INFORMATION AND MATERIALS

The Government will provide the following information and materials:

● Meadowood SRMA Reference Plans

● Sensory Trail Inspiration Imagery and Examples

● Project Site Photos

● NEPA Documents, including:

○ Sensory Trail NEPA Environmental Assessment and Finding of No Significant Impact

(FONSI)

○ Mustang Trailhead NEPA Environmental Assessment and Finding of No Significant Impact

(FONSI)

○ Enchanted Pond Outflow System Replacement Categorical Exclusion (CE) and Decision Record (DR)

● BLM Building Codes and Standards

● CXT vault toilets including pre-installation/pre-delivery instructions (pre-installation by DBC)

● Mustang Trailhead Information Kiosk and wayfinding signage including kiosk installation steps

(Installation by DBC)

● Portal Sign at Sensory Trail access / Gunston Road intersection (Installation by DBC)

2 GENERAL PROJECT REQUIREMENTS

2.1 PROGRESS PAYMENTS

Progress payments shall be made to the DBC as follows:

2.1.1 Design Phase:

Progress payments during the design phase of the work will be based on submission, review, and acceptance of design deliverables as outlined in this Statement of Work.

2.1.2 Construction Phase:

Progress payments during construction will be based on the percentage of work completed on items listed on the approved schedule of values. Actual construction completed and in place will form the basis for payment. Verification of the percentage of completion shall be initiated by the DBC under the direction of a representative of the Government, unless the Government waives this requirement in a specific instance. The DBC shall make the computations for payment based on the Government’s verification of work completed and in place for any periods for which progress payments are requested. The DBC shall furnish to the Government originals of all field notes and

Design-Build Statement of Work

13 March 2026 all other records relating to the basis for payment, who shall use them as necessary to determine the final amount of progress payments. The DBC shall retain copies of all such material furnished to the Government.

2.2 PROJECT SCHEDULE

The Project Schedule shall be managed by the DBC as follows:

2.2.1 General:

The DBC shall furnish the project schedule to the Government and provide digital copies after award and before the Design Meetings. The Schedule shall include a detailed design phase with design deliverable submission dates and review periods, as well as a summary construction schedule, with important milestones included for both phases.

The DBC shall fully develop the construction portion of the schedule and submit it to the Government before the Preconstruction Meeting or any construction begins. The project schedule shall be updated every month throughout the entire contract period until project substantial completion. The status date of each schedule update shall be 10 days before the progress payment request date.

2.2.2 Purpose:

The purpose of the project schedule is to ensure adequate planning, coordination, scheduling, and reporting during execution of design and construction activities of the DBC. The project schedule will assist the DBC and the Government in monitoring the progress of the work, evaluating proposed changes, and processing the DBC’s monthly progress payment requests.

2.2.3 Software:

Scheduling software shall be the latest version of Microsoft Project or approved equal.

2.2.4 Schedule Development:

The project schedule shall cover the entire contract period. The late finish date of the project schedule shall be the same date as the established completion date of the contract.

The DBC shall use the Critical Path Method (CPM) with limited use of lead or lag durations between scheduled activities. The DBC’s project schedule shall consist of procurement activities (including mobilization, submittal issue and approvals, and the fabrication and delivery of key and long-lead procurement items) and construction activities.

The DBC’s project schedule shall consist of, but not be limited to, the following for each activity:

• Identify each and every activity number with numerical designations (maximum 5-digit).

Number of activities shall be in increments of 10.

• Concise description of the work represented by the activity (maximum 48 characters).

Avoid the use of non-standard abbreviations. The work related to each activity shall be limited to one work trade.

• Activity duration in whole working days with a maximum duration of 15 workdays each, unless otherwise approved by the Government; exceptions may be made for non-

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13 March 2026 construction activities including mobilization, shop drawing and sample submittals, fabrication of materials, delivery of materials and equipment, and concrete curing.

In developing the project schedule, the DBC shall be responsible for ensuring that subcontractor work at all tiers, as well as its own work, is included in the project schedule.

The project schedule shall show the sequence and interdependence of activities required for complete performance of the work. The DBC shall be responsible for ensuring all work sequences are logical and the project schedule shows a coordinated work plan, with critical path dependencies clearly delineated. Proposed durations assigned to each activity shall be the DBC’s best estimate of time required to complete the activity considering the scope and resources planned for the activity. Resource loading of each activity shall list all personnel by labor category and equipment type and capacity proposed to complete the activity in the duration shown. Include any permit requirements and constraints. Seasonal weather conditions shall be considered and included in the planning and scheduling of all work influenced by high or low ambient temperatures, wind and/or precipitation, etc. to ensure completion of all work within the contract time.

2.2.5 Project Schedule Updates

2.2.5.1 Monthly Updates:

The monthly updating of the project schedule shall be an integral part and basic element of the estimate upon which progress payments shall be made under this contract. If, in the judgement of the Government, the DBC fails or refuses to provide a schedule of values and a complete schedule update or revision as specified hereinafter, the DBC shall be deemed to have not provided the required information upon which the progress payment may be made and shall be subject to retainage of a portion of the payment.

2.2.5.2 Progress Report:

The report shall include a brief description of the actual progress made during the update period; actual and potential delaying activities; any impediments to progress; issues related to inclement weather; progress toward established milestones and project float. The report shall include a brief description of the work anticipated to be performed in the next month.

Any minor revisions to the schedule should be identified so they can be evaluated and accepted or rejected.

As the project progresses, indicate Actual Completion percentage for each activity. If the schedule update shows a late finish date after the contract completion date, at a minimum, include the following in the progress report submission:

• Any known delays.

• Actions that will be taken to get back on schedule.

• Pending modifications.

• Impediments or constraints affecting progress.

2.2.6 Progress Payments:

The monthly updating of the currently accepted construction schedule shall be an integral part of the process upon which progress payments will be made under this contract. If the DBC fails to provide schedule updates or revisions, then a portion of the monthly payment may be retained until such corrections have been made.

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Time Impact Analysis for Contract Modifications, Changes, Delays, and Contractor Requests Requirements:

When contract modifications or changes are initiated, delays are experienced, or the DBC desires to revise the project schedule, the DBC shall submit to the Government a written time impact analysis illustrating the influence of each modification, change, delay, or DBC request on the contract time.

Time Extensions:

Activity delays shall not automatically mean that an extension of the contract time is warranted or due the DBC. It is possible that a modification, change, or delay will not affect existing critical activities or cause non-critical activities to become critical. A modification, change, or delay may result in only absorbing a part of the available total float that may exist within an activity chain of the project schedule, thereby not causing any effect on the contract time. Time extensions will be granted in accordance with the terms of the contract.

Float: Float is not for the exclusive use or benefit of either the Government or the DBC.

Extension of the contract time will be granted only to the extent the equitable time adjustments to the activity or activities affected by the modification, change, or delay exceeds the total (positive or zero) float available on a particular activity.

2.3 FORMS

The Government will require the DBC to submit the following forms at appropriate intervals and milestones established prior to commencement of project construction:

• Submittal / Transmittal.

• Accident / Property Damage Reports.

• Quality Control Reports.

• Testing Reports.

• Inspection Reports.

• Update / Status Reports.

The actual forms used will be designed by the DBC with input from the Government and approved by the Government. As part of this SOW, the Government has provided sample forms that the Government has utilized in the past.

3 DESIGN PARAMETERS

3.1 GENERAL

The Sensory Trail design will be based on the Scope of Work and Salient Features Document developed by the Government and included with the project solicitation, as well as largely influenced by the existing Autism Nature Trail (ANT) in New York. The DBC will be responsible for developing an integrated design solution, construction documents, and final construction.

The project design will require review and coordination with the Government. This includes, but is not necessarily limited to utility development, security fencing, vehicle / equipment storage, and parking for personal and Government vehicles.

The DBC remains fully responsible for determining if the standards or provisions cited in the Performance Specifications have been revised or updated. Any such conflicts between the Performance Specifications

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13 March 2026 and the identified standard or provisions shall be brought to the attention of the Government requesting direction.

All Architect-Engineer (A/E) Services shall be performed by licensed Architects and Engineers registered in the State of Virginia.

3.2 COMPLIANCE & AUTHORITY HAVING JURISDICTION (AHJ)

The project design shall comply with all applicable codes, regulations, and standards to ensure adherence to safety, structural integrity, and environmental requirements. This includes, but is not limited to, compliance with all standards identified in the “BLM Building Codes and Standards” document, BLM Manual 9112 "Bridge and Major Culvert Manual", AASHTO "LRFD Bridge Design Specifications", AASHTO "LRFD Guide Specifications For The Design Of Pedestrian Bridges", and the FHWA Manual on Uniform Traffic Control Devices (MUTCD). It is the responsibility of the contractor and associated personnel to ensure that all aspects of design meet these requirements throughout all phases of the project to guarantee public safety and the long-term functionality of the facilities.

The BLM will serve as the Authority Having Jurisdiction (AHJ) on this project; therefore, a building permit will not be required. While the BLM will serve as the Authority Having Jurisdiction (AHJ), some of these services may still require coordination with state and local agencies (e.g. utility service approvals). The DBC shall prepare the necessary submittal documentation for clearances and approvals when needed.

3.3 GEOTECHNICAL REPORT

The DBC shall perform on-site Geotechnical Engineering Analyses for the relevant areas within the project area boundaries and shall at a minimum analyze soils at the following locations:

1. Access road.

2. Trailhead Parking Lot.

3. Vault toilets.

4. Trail Entrance Structure.

5. Activity stations where proposed structures will require load-bearing systems.

6. Stream crossing structures.

7. Any other areas that may need analysis prior to construction.

Stamped and signed Geotechnical report with foundation recommendations and Survey information shall be provided to the Government.

3.4 SURVEY

A topographic site survey shall be provided by the DBC for all three sites outlined in Section 1. A minimum of two permanent control points shall be set at each site during the survey. Any control points disturbed or removed during construction shall be reset by the DBC. Control points shall be a #5 rebar 18-24 inches long identified by a minimum 24-inch stake and flagging, unless otherwise approved by the Government.

The DBC shall identify and document relevant property lines adjacent to existing privately owned parcels of land as necessary to ensure all proposed work is

The topographic survey shall utilize global positioning, traditional surveying methods, or other appropriate industry standard surveying techniques. Survey datum shall be North American Datum of 1983 (NAD 83) and the North American Vertical Datum of 1988 (NAVD 1988). The DBC shall be responsible for

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13 March 2026 determining survey boundary extents, accuracy, control, and features collected to be able to provide enough information that will be used as the basis for detailed civil design and site development. The DBC will be responsible for determining and locating utility locations, including underground services. The DBC shall submit an AutoCAD Civil3D.dwg file of the survey to the Government.

3.5 SITE DESIGN

The DBC shall evaluate the feasibility of wasting excavated material onsite vs offsite disposal.

There are no existing utilities on any the project sites. It will be the DBC is responsible to locate all utilities and coordinate any proposed utility hook-ups, including but not limited to primary electric and potable water.

The DBC will initiate contact with the relevant power and water companies and will coordinate with them to have service extended to the location proposed in this SOW. The construction documents shall indicate individual advance metering for all applicable utilities.

The DBC shall investigate the site and perform on-site Geotechnical Engineering Analyses, Hydraulic Analysis, and a Topographic Site Survey as required. Stamped and signed Geotechnical report with foundation recommendations and Survey information shall be provided to the Government.

The DBC shall evaluate the site, consult with the Government, and review the Project Scope provided by the Government. After proposed changes are approved by the Government at the conclusion of Schematic Design, the DBC shall proceed with Design Development and subsequently prepare Construction Documents.

All stream crossing shall be designed in accordance to BLM Manual 9112 “Bridge and Major Culvert Manual”. The structure shall be designed to sufficiently pass the anticipated flow of a 100-year storm event.

The stream crossing structure shall include pedestrian railing measuring a minimum of 54 inches from edge of trail to top of railing, the structure shall be wide enough to maintain a trail width of 6.5 feet over the structure measured from face of rail to face of rail. DBC shall evaluate the structure for any potential scour and provide scour mitigation to withstand the effect of scour from a 100-year flood event. Culvert types permitted include a round reinforced concrete pipe, round reinforced high-density polyethylene pipe, a 3-sided open-bottom reinforced concrete box culvert, or a 4-sided concrete box culvert. Pedestrian/trail bridges shall be timber or self-weathering steel girders with a timber deck/wearing surface. The design of pedestrian/trail bridges shall accommodate a bridge length that will place the abutments outside of the channel with minimal risk of scour. Bridges shall be designed in accordance with the most current version of the AASHTO "LRFD Bridge Design Specifications" and AASHTO "LRFD Guide Specifications For The Design Of Pedestrian Bridges".

All facets of stream crossing structures shall be designed, reviewed and stamped by a Professional Engineer registered in the State of Virginia. Stream crossing structures shall be designed to accommodate all loads outlined in the "LRFD Guide Specifications For The Design Of Pedestrian Bridges" including the equestrian load and a vehicle load to accommodate an occasional six thousand pounds (6,000 lb) four-wheel vehicle with the load equally distributed to four wheels. The intent of the vehicle load is to account for the occasional fully loaded off road utility vehicle. The DBC shall perform a geotechnical investigation and a hydraulic analysis. Any variations from the standards outlined above will need approval from the Government.

Design of the Mustang Trailhead Parking and Sensory Trailhead shall comply to Fairfax County, Virginia – Code of Ordinances, Chapter 124.1 Erosion and Stormwater Management Ordinance

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Anticipated services include Site and Utility Analysis (including Geotechnical Investigation, Hydraulic Analysis, and Topographic Survey), Schematic Design, Design Development, and Construction Documents with each submittal, at the appropriate class level.

3.6 SENSORY TRAIL DESIGN

The DBC shall include, at a minimum, one medical or clinical specialist with demonstrated expertise in neurodiversity and sensory processing – such as a pediatric occupational therapist trained in sensory integration, or a sensory integration specialist with experience working with individuals on the autism spectrum. This specialist shall be either a direct member of the design team or retained as a dedicated consultant throughout project planning, design reviews, and construction phases. Their responsibilities will include guiding the placement and types of sensory stimuli and regulation zones, reviewing material selections and environmental transitions, and advising on accommodations (amenities, facilities, and infrastructure) tailored to sensory sensitivities and self-regulation strategies. Additional consultation from professionals such as a developmental pediatrician, neuropsychologist, or behavior specialist with documented experience in sensory processing disorders and autism is strongly encouraged to validate that the trail design aligns with clinical best practices.

The DBC must furnish and install all materials, components, and assemblies including equipment/structures in the sensory stations using high-quality, durable, commercial-grade, and weather resistant products suitable for continuous outdoor use and visitor wear. Materials used in the sensory trail project shall be non-toxic, splinter-free, corrosion-resistant, and designed for safe, tactile interaction by users of all ages and abilities.

3.7 BUILDING DESIGN (TRAIL ENTRANCE STRUCTURE)

The Trail Entrance Structure shall serve as a welcoming, durable, and visually engaging entry point to the sensory trail. The structural shall be sized and configured to comfortably accommodate anticipated typical visitor flow, including individuals with disabilities, families, and small groups.

The design of the Trail Entrance Structure shall reflect a park-appropriate, nature-integrated aesthetic consistent with the sensory trail theme by incorporating natural wood materials and stone or stone veneer elements at bases, seating, columns, or low walls to create a sense of permanence and grounding.

Roofing systems shall be durable, low maintenance and compatible with local climate conditions.

Provide fixed seating elements suitable for individuals and small groups. Seating area shall be fully accessible, including appropriate height, knee clearance, and firm/level approach surfaces. Seating materials shall be weather resistant, splinter-free and shall prevent ponding of water on its surfaces.

Provide mounting locations and infrastructure for an accessible, visitor-friendly sensory trail map. Include space for regulatory signage (separate from SRMA Information Kiosk), trail rules, and emergency information.

Provide a stable, non-slop accessible surface beneath and immediately surrounding the structure. Ensure positive drainage to prevent pooling or erosion. Integrate landscaping elements (native plantings, pollinator attractors, low-maintenance vegetation) where appropriate.

Minimize protrusions or hazards; edges and transitions shall be clearly defined.

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