1600103 - Bid Set - Design Manual.pdf

EWINGCOLE | NMNH UPGRADE SANITARY AND STORM SYSTEMS DESIGN MANUAL SF PROJECT #1600103| © EWINGCOLE 2025

Smithsonian Institution National Museum of Natural History

10th STREET AND CONSTITUTION AVENUE | WASHINGTON DC | DC 20560

Upgrade Sanitary and Storm Systems

Bid Set Issuance

Project Manual

SMITHSONIAN FACILITIES CONNTRACT NUMBER: 1600103

EWINGCOLE PROJECT NUMBER: 20190809

November 5, 2024

CONTENTS

EWINGCOLE | NMNH UPGRADE SANITARY AND STORM SYSTEMS DESIGN MANUAL SF PROJECT #1600103| © EWINGCOLE 2025

1.0 EXECUTIVE SUMMARY Tab 1

1.1 Project Executive Summary

2.0 PROGRAM SUMMARY Tab 2

2.1 Table of Space Types

2.1.1 Public Restrooms

2.1.2 Non-Public Restrooms

2.1.3 Family Restrooms

2.1.4 Pantries

2.1.5 Third Floor - Rose Room

2.1.6 Third Floor Shared Office (Room 317)

2.1.7 Wing Dash Elevator Lobbies

2.1.8 Wing Dash Labs

3.0 SCHEDULE Tab 3

3.1 Construction Schedule

4.0 COST MODEL Tab 4

4.1 Cost Estimate

5.0 ARCHITECTURE Tab 5

5.1 Regulatory Criteria

5.2 Main Building

5.2.1 Tunnels

5.2.2 North Lobby

5.2.3 West Dock

5.2.4 Third Floor Women’s Restroom

5.2.5 Third Floor Pantries

5.3 East and West Wings

5.3.1 Dash Restrooms

5.3.2 Wing Restrooms

5.3.3 East Court Family Restroom

5.4 Phasing

5.4.1 Phase 1 – Main Building

5.4.2 Phase 2 & 3 – West and East Wing

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6.0 INTERIOR DESIGN Tab 6

6.1 Program Narrative

6.1.1 Main Building

6.1.2 East Wing

6.1.3 West Wing

6.1.4 East Court

6.1.5 Temporary Construction

6.2 Interior Architectural Materials General

6.3 Interior Finishes

6.3.1 Main Building

6.3.2 East Wing

6.3.3 West Wing

6.3.4 Restrooms

6.3.5 East Court – Family Restroom

6.3.6 West Wing - Third Floor Copy Room

6.3.7 East and West Wing - Fourth Floor Copy/Microwave Room

6.3.8 West Wing - Fifth Floor Copy/Microwave Room

6.3.9 Custodial Closets

6.3.10 Construction Walls

6.4 Toilet Accessories

6.4.1 Restrooms

6.4.2 Pantries

7.0 STRUCTURAL Tab 7

7.1 Applicable Codes and Standards

7.2 Existing Conditions Summary

7.3 Design Criteria

7.3.1 Risk Category

7.3.2 Design Live Loads for Structure Supporting New Work

7.3.3 Seismic Load Criteria

7.3.4 Materials for New Work

7.4 Structural Systems

7.4.1 Storm Drainage Routing

7.4.2 Restroom and Pantry Renovations

7.4.3 Floor Penetrations Through Existing Floor Assemblies

7.4.4 Access to Service Tunnels

7.4.5 Utility and Partition Support Framing

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8.0 MECHANICAL Tab 8

8.1 Applicable Codes and Standards

8.2 Existing Conditions Assessment

8.3 Design Criteria

8.3.1 Climatic Conditions

8.3.2 Ventilation

8.3.3 Indoor Design Criteria

8.4 HVAC Loads

8.5 Cooling and Heating Plants

8.6 HVAC Systems

8.7 HVAC Controls

8.8 Commissioning

9.0 PLUMBING Tab 9

9.1 Applicable Codes and Standards

9.2 Existing Conditions Assessment

9.3 Design Criteria

9.3.1 Storm Drainage Systems

9.3.2 Sanitary Waste and Vent

9.3.3 Potable Cold Water (Renovated Restrooms and New Pantries)

9.3.4 Potable Hot Water (Renovated Restrooms and New Pantries)

9.3.5 Existing Office Sink Locations

9.3.6 Plumbing Fixtures and Specialties

9.4 General

9.5 Materials of Construction

9.5.1 Piping Specifications

9.6 Plumbing and Utility Interface

10.0 ELECTRICAL Tab 10

10.1 Applicable Codes and Standards

10.2 Existing Conditions Assessment

10.3 New Work

11.0 ELECTRICAL Tab 11

11.1 LEED

11.2 Life Cycle

11.3 Water Consumption

EWINGCOLE | NMNH UPGRADE SANITARY AND STORM SYSTEMS DESIGN MANUAL SF PROJECT #1600103| © EWINGCOLE 2025

12.0 HAZMAT Tab 12

12.1 Hazmat

13.0 Civil Tab 13

13.1 Civil

14.0 PROJECT TEAM Tab 14

14.1 Architect/Engineer/Interior Designer

14.2 Specialty Consultants

1.0 EXECUTIVE SUMMARY

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1.1 PROJECT EXECUTIVE SUMMARY

The National Museum of Natural History has existed on the National Mall for more than a century. In that time, the building grew significantly from the original footprint to meet the ever-changing needs of the institution. Originally opened in 1910, the building was expanded in the 1960s with the addition of the East and West Wings, which provided storage space for the museums’ vast collections as well as supporting staff spaces. Over the next several decades the original building’s courtyards were infilled to provide additional necessary square footage for both public and private needs. In addition, the

Chiller Plant was constructed in the east parking lot to better support building-wide infrastructure needs.

Many decades of use have left the Storm and Sanitary Systems in need of extensive repair and in many cases full replacement in various portions of the building. As problems have developed over time, the museum has repaired leaks as best they can, but the number and frequency of repairs are becoming unsustainable. This growing problem has placed numerous collections, research, exhibit, and office spaces at a level of unacceptable risk.

A significant intervention is needed to address these failing systems so that the museum can continue its mission.

As part of a comprehensive Implementation Study, the Design Team surveyed the Storm and Sanitary Systems throughout the building to gain a comprehensive understanding of the condition. The exhaustive survey effort uncovered many issues with the Storm and

Sanitary piping systems. In addition to systems needing replacement because of being at the end of their useful life, many components were found to be inadequately sized, improperly installed or contained materials not in alignment with current Smithsonian

Design Standards (SDS). Based on the findings, a series of options were developed to address the issues and compiled into the Implementation Study Report. The report made recommendations for each issue and weighed the pros and cons of each. Since the report has been issued, SI has made decisions on how to proceed. Those decisions are reflected in this 100% Construction Documents Submission.

The path forward for the Storm and Sanitary Systems are highlighted below:

• East and West Wing Toilet Rooms

The renovation of a stack of restrooms one at a time will be phased, starting from the top and working down. To facilitate this a new stack will be installed prior to commencement of demolition to allow for a more efficient construction process.

• East and West Wing Storm Piping

A single storm piping stack will be replaced in kind one stack at a time. Roof drains will be plugged while the piping in a stack is methodically replaced floor by floor. New Roof drains will not be provided.

• East and West Wing Office Sinks

Existing office sinks will be maintained in the East and West Wings. The sanitary piping associated with these existing sinks will be replaced. Existing piping will be demolished and abandoned in place. Domestic water to these sinks will not be impacted.

1.0 EXECUTIVE SUMMARY

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• Main Building Storm Piping

New stacks will be provided, from the attic to the tunnels that are offset to peripheral spaces that have potential to have less impact on building operations, both public and private. Existing stacks will be abandoned in place to avoid disruptive and costly demolition.

• Main Building Roof Scuppers

The roof scuppers connected to the Main Building’s stormwater system feature a variety of attachment methods to the existing copper roofing. Internal repairs will be conducted on the scuppers at locations where leaks have been identified.

• Main Building Third Floor Office Sinks

Remove office sinks, cap, and abandon associated piping in place. Kitchenettes will be provided to give users access to sinks in this area of the building.

• Main Building Toilet Rooms

Main Building toilet rooms will be renovated. New offset stacks will be provided to facilitate the renovation of restrooms.

• Tunnel Piping Replacement

Much of the existing piping in the Main Building requires replacement. New, larger tunnel access points throughout the Ground Floor of the Main Building will be needed to better support the replacement effort.

• Exterior Storm Piping Replacement

At seven locations, the storm piping increases in size as it exits the building. This change results from the consolidation of stormwater piping within the Main Building, East Wing, and West Wing. As internal piping systems merge, the combined flow necessitates larger pipe diameters downstream. Consequently, exterior excavation is required to accommodate the upsized piping and to reconnect it to the nearest existing storm drain structures. Additional details regarding this scope of work are provided in the Plumbing and Civil Engineering sections of this report.

2.0 PROGRAM SUMMARY

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The Upgrade Sanitary and Storm Project maintains the existing restrooms throughout the building while upgrading the necessary infrastructure that supports them. Modifications throughout the building will improve the accessibility of the space and provide spaces for gender inclusiveness.

The core program function of these spaces remains unchanged.

2.1 TABLE OF SPACE TYPES

2.1.1 PUBLIC RESTROOMS

Restrooms serving the public in the Wings and Main Building will be revitalized as part of this project. Each space will receive all new finishes and improve layouts where applicable. To the greatest extent possible, existing fixture counts will be maintained.

2.1.2 NON-PUBLIC RESTROOMS

Restrooms in staff areas, particularly in the Wings, will be revamped. Many of these spaces will have adjustments to the layout that improve the overall flow.

Additionally, underutilized space previously used as lounges in women’s restrooms will be utilized to add additional useable space to restroom facilities.

2.1.3 FAMILY RESTROOMS

Family Restrooms are an amenity that provides a gender neutral, universally accessible restroom for both the public and non-public. The key difference in this restroom from a single-use gender neutral room is the adult changing table, which provides an amenity previously not provided in the building.

2.1.4 PANTRIES

To minimize the impacts of sanitary pipe replacement in the Main Building, office sinks are being removed on the Third Floor. To allow staff access to sinks for personal use, two pantries are being provided on the Third Floor of the Main

Building. Spaces selected for this function are identified below.

2.1.5 THIRD FLOOR - ROSE ROOM

The Rose Room is a large conference room that is used for lectures, conferences, and meetings. The pantry will replace the existing sink in this space. The purpose of this amenity is to serve the staff in the East Range, providing them with a place to store and prepare their lunch or cater for an event happening in the room.

2.1.6 THIRD FLOOR SHARED OFFICE (ROOM 317)

The Shared Office in the East Hall contains a space outside of the room to be utilized as a pantry. There will be some space taken out of the adjacent custodial closet to house this pantry. The purpose of improving this amenity is to serve the staff in the East Hall, providing them with a place to store and prepare their lunch.

2.0 PROGRAM SUMMARY

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2.1.7 Wing Dash Elevator Lobbies

The elevator lobbies outside of the wing restrooms will are heavily trafficked and will take constant wear and tear as part of the renovations of the restrooms. These areas will be improved through new finishes and new water fountains, to provide an improved transitional space into the new restrooms for both the public and non-public.

2.1.8 Wing Dash Labs

The labs adjacent to wing dash restrooms on the first and third floor of both wings will be utilized as part of the sanitary piping scope. These rooms will be used to access sanitary pipes as they come from the restrooms above. Where labs have outdated ceilings and fixtures, they will receive new ceilings, lighting, diffusers, sprinklers, and paint. Where labs have been recently renovated, they will receive new paint.

3.0 SCHEDULE

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3.1 CONSTRUCTION SCHEDULE

A construction schedule for the implementation of this project is included in this section.

This schedule will be updated throughout the design. Future phases of the project will identify the preferred sequencing of the work through the building.

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Start Tue 2/3/26

Finish Wed 11/15/28

Mar '26 May '26 Jul '26 Sep '26 Nov '26 Jan '27 Mar '27 May '27 Jul '27 Sep '27 Nov '27 Jan '28 Mar '28 May '28 Jul '28 Sep '28 Nov '28

East Wing Wed 3/18/26 - Tue 9/22/26

Main Building – East Hall Wed 9/16/26 - Tue 1

Main Building - East Range Wed 12/16/26 - Tue 4/20/27

Main Building - North Hall Wed 4/14/27 - Tue 8/17/27

Main Building – Rotunda Wed 8/11/27 - Tue 11

Main Building - W e Wed 11/10/27 - Tue

Main Building - West Range Wed 2/2/28 - Tue 6/20/28

West Wing 28 Mon 3/6/28 - Tue 11/14/

Bathroom Updates Tue 2/3/26 - Mon 5/1

Project Management Tue 2/3/26 - Wed 11/15/28

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4.0 COST MODEL

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4.1 COST ESTIMATE

A cost estimate is being issued under a separate cover. The estimate was developed in

CostOS in accordance with SI standards and templates.

5.0 ARCHITECTURE

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This Architectural narrative has been updated to reflect the development of the NMNH Upgrade

Sanitary and Storm design since the Implementation Study Phase. Please refer to the 100%

Construction Documents drawings for additional information.

5.1 REGULATORY CRITERIA

• Smithsonian Institution Facilities Design Standards - 2021 Edition

• International Building Code (IBC) 2021 Edition

• International Existing Building Code (IEBC) 2021 Edition

• (ANSI) American National Standards Institute All related documents.

• Smithsonian Institution, Office of Facilities and Operations, Codes, Standards and

• Guidelines Latest edition

• Smithsonian Sustainability Plans Latest edition.

5.2 MAIN BUILDING

The ground-breaking ceremony for the new United States National Museum was held on

June 15, 1904, and the museum officially opened to the public on March 17, 1910, just before it was fully complete. Over time the building became known as the National Museum of Natural History (NMNH). Over the course of more than a century, the building and site have undergone continuous, substantial changes, resulting in a building that continues to evolve to this day.

5.2.1 TUNNELS

The Tunnels are located below the Ground Floor of the Main Building. They were originally built to accommodate the distribution of Mechanical, Electrical, and

Plumbing systems across the building. Over the years the tunnels have become congested in various locations. To accommodate the extensive piping replacement required in the tunnels, a few of the tunnel access hatch locations on the Ground

Floor will need to be replaced and enlarged to facilitate work within the tunnels. It is also anticipated that access to the tunnels will require extensive use of the space where the hatch access points are located. This may interfere with the function of the space while the tunnel work is being performed.

5.2.2 NORTH LOBBY

The North Lobby is the Ground Floor access point for staff and the public alike to enter the Museum. Located off the North Lobby, the public restrooms are extensively used by the public.

The interior elements of the North Lobby Restrooms, finishes, fixtures, and toilet accessories have been refreshed over the years due to constant wear and tear.

Universally accessible toilet stalls and fixtures have been installed in both North

Lobby restrooms. Existing tiling in the North Lobby restrooms produce cleaning and maintenance issues due to their small format and excessive grout lines. The existing tile has been coated to protect the grout and provide surfaces that are easier to clean. The coating strategy has been implemented in several restrooms throughout the building. While this has eased maintenance and provided an aesthetic refresh, recoating does not provide long-term durability.

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The design intent for the North Lobby Restrooms is to update the current layout and upgrade the fixtures and finishes to provide a higher level of durability. A new

Family Restroom, located near the Evans Gallery, includes accessible fixtures, accessories, and an adult changing table. Within North Lobby Restrooms, the tiling, paint, and toilet partitions will be improved to remedy the current hygiene concerns.

The sanitary scope for this area will be minimal due to its frequent maintenance over its history, which provides the opportunity to phase the work later.

This will allow the public to continue to use these restrooms while work is happening in non-public areas.

5.2.3 WEST DOCK

The West Dock is a major access point for deliveries to the building. There are two restrooms directly beside the loading dock that will require sanitary piping replacement and updated layouts. Due to its proximity to a vital loading area, the existing perimeter walls will be maintained to minimize disruption. The revised layouts provide universal accessibility while also converting them into single-use restrooms.

5.2.4 THIRD FLOOR WOMEN’S RESTROOM

The Third Floor Women’s Restroom is one of the few remaining restrooms from the museum’s original early 1900s construction. Finishes in this space include marble flooring and wall coverings, laminate counter tops (Added later), and wooden toilet stalls. The design team will document the salvage and storage of the historic material for NMNH use in the future. The space will receive all new finishes to be aligned with new restroom standards being implemented as part of this project.

5.2.5 THIRD FLOOR PANTRIES

The Third Floor scope includes two new pantries to respond to the removal of office sinks in offices in this portion of the building. One of these pantries will be in the

Rose Room. The other pantry will be located outside of Room 317. The design of both pantries provides six-foot layouts, including cabinetry, countertop, sink, a commercial microwave, and a commercial mini fridge.

5.3 EAST AND WEST WINGS

5.3.1 DASH RESTROOMS

The Dash is the connection point between the Wing Buildings and the Main Building.

Both the West Wing and East Wing have their own Dash spaces, containing various

MEP spaces, vertical transportation, and some staff and collection spaces. The restrooms on the Second and Fourth Floor of the Wing Dash Spaces have direct access to the Main Building, so they were designed to accommodate public use.

These restrooms will be renovated to accommodate (3) Gender Neutral Single Use restrooms.

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5.3.2 WING RESTROOMS

The Wing restrooms are non-public male and female restrooms, with a custodial closet. These facilities will be brought to equivalent square footages to provide universal accessibility, as well as efficient sanitary stacks. When the women s restrooms in the wings were originally built, they each were adjacent to a vestibule space. Over time, some of these spaces have become programming for the needs of the department occupying the floor. We have provided restroom layouts to accommodate the sanitary and restroom layout design around these department’s programmatic needs. Further coordination to accommodate these ancillary programs will occur in later phases.

5.3.3 EAST COURT FAMILY RESTROOM

The East Court Second Floor contains existing public restrooms including a family restroom. While the exiting family restroom meets some accessibility requirements, the design intent is to update the space to improve the universal accessibility by providing improved clearances, fixtures, accessories including a new adult changing table. This is the second Family Restroom containing a new adult changing table as part of this project.

5.4 PHASING

The project is divided into three primary phases:

Phase 1 – Main Building

Phase 2 – West Wing

Phase 3 – East Wing

Each phase will be executed using a top-down construction approach, beginning in the attic, and progressing downward. This methodology is driven by the requirements of the piping replacement strategy, which is detailed further in the Plumbing section of this report.

5.4.1 Phase 1 – Main Building

Phase 1 is further subdivided into the following sequential subphases, organized by building sections:

Phase 01A – Mobilization

Phase 01B – West Hall

Phase 01C – Rotunda

Phase 01D – East Hall

Phase 01E – North Hall

Phase 01F – East Range / East Court

Phase 01G – West Range / West Court

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These subphases are arranged based on the contractor’s primary access point at the West

Hall Dock, with work proceeding in a logical sequence according to the physical adjacency of each area. The contractor is required to fully complete each subphase before advancing to the next.

5.4.2 Phases 2 and 3 – West and East Wings

Phases 2 and 3 will follow a similar top-down and adjacent-based sequencing strategy, ensuring consistency in execution and minimizing disruption across the site.

6.0 INTERIOR DESIGN

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This Interiors narrative has been updated to reflect the development of the NMNH Upgrade

Sanitary and Storm design since the Implementation Study Phase. Please refer to the 100%

Construction Documents drawings for additional information.

6.1 PROGRAM NARRATIVE

6.1.1 MAIN BUILDING

6.1.1.1 North Lobby Restrooms

The North Lobby Restrooms will receive new finishes, plumbing fixtures, and toilet accessories. This includes a new family restroom containing an adult changing table.

6.1.1.2 Third Floor Private Restroom

The Private Restroom will receive all new finishes, plumbing fixtures, and toilet accessories. Our intent is to meet universal accessibility requirements, and we will identify any conditions that may not meet these requirements.

6.1.1.3 Third Floor Women s Restrooms

The Women s Restrooms will receive all new finishes, plumbing fixtures, and toilet accessories. Our intent is to meet universal accessibility requirements, and we will identify any conditions that may not meet these requirements.

6.1.1.4 Third Floor Rose Room Pantry

The Rose Room Pantry will receive all new finishes. 6’-9” countertop w/ base and wall cabinets. Must meet accessibility requirements. Include undermount sink, microwave, UC fridge, and built-in trash receptacle.

Patch and repair disrupted finishes in adjacent spaces. The existing walls in the Rose Room to receive new wall paint.

6.1.1.5 Third Floor Shared Office Pantry

The Shared Office Pantry will receive all new finishes. 6’-9” countertop w/ base and wall cabinets. Must meet accessibility requirements. Include undermount sink, microwave, UC fridge, and built-in trash receptacle.

6.1.2 EAST WING

6.1.2.1 Restrooms

The East Wing Restrooms will receive all new finishes, plumbing fixtures, and toilet accessories. Must meet accessibility requirements unless noted otherwise.

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6.1.3 WEST WING

6.1.3.1 Restrooms

The West Wing Restrooms will receive all new finishes, plumbing fixtures, and toilet accessories. Must meet accessibility requirements unless noted otherwise.

6.1.4 EAST COURT

6.1.4.1 Family Restroom

The East Court Family Restroom will receive all new finishes, plumbing fixtures, and toilet accessories. This will also include an adult changing table. Must meet accessibility requirements unless noted otherwise.

6.1.5 TEMPORARY CONSTRUCTION

6.1.5.1 Construction Walls

Temporary construction walls to receive temporary finishes to provide a finished appearance while construction is underway. Finishes to include wall base, paint, and graphics. Graphics to be coordinated and provided by others.

6.2 INTERIOR ARCHITECTURAL MATERIALS GENERAL

Interior partitions will be identified as one of the following types:

• 6 or 8 CMU braced above the ceiling to the structure above, located at perimeter walls of the restroom where indicated,

• 3 5/8 Cold Formed Metal Framing (CFMF): braced above the ceiling to the structure above, located at walls shared between spaces where indicated.

• Cold Formed Metal Framing (CFMF): braced above the ceiling to the structure above, located at furring conditions against existing walls and existing structure where indicated.

New doors will be painted hollow metal with painted hollow metal frames.

6.3 INTERIOR FINISHES

All materials specified shall be in accordance with all prevailing codes, regulations, and industry testing standards.

For the interior environment, materials shall be selected to reinforce the overlaying need for function, durability, and maintainability.

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6.3.1 MAIN BUILDING

All toilet rooms in the Main Building will receive new finishes, plumbing fixtures, and toilet accessories. Pantries will receive new finishes and appliances. Patch and repair disrupted finishes in adjacent spaces. Provide temporary construction walls where required.

6.3.1.1 North Hall Restrooms

• Floor: Large Format Ceramic Tile

• Ceiling: Acoustic Ceiling Tile (24x48)

• Walls: Full-height Ceramic Wall Tile, including metal edge trim at outside corners

• Base: Metal Cove Base

• Countertops: Solid Surface w/ solid surface angled panel apron, and undermount sinks

• Mirrors: Frameless w/ Wall mounted Lighting

• Toilet Accessories: Provide all new Accessories and Waste

Receptacles as indicated.

• Toilet Partitions: Phenolic floor mounted, overhead braced, No

Sightline System

6.3.1.2 Third Floor Private Restroom

• Ceiling: Acoustic Ceiling Tile (24x48)

• Walls: Full-height Ceramic Wall Tile, including metal edge trim at outside corners

• Base: Metal Cove Base

• Mirrors: Framed Mirror w/ wall mounted lighting.

• Toilet Accessories: Provide all new Accessories and Waste

Receptacles as indicated.

6.3.1.3 Third Floor Women s Restrooms

• Ceiling: Acoustic Ceiling Tile (24x48)

• Walls: Full-height Ceramic Wall Tile, including metal edge trim at outside corners

• Base: Metal Cove Base

• Countertops: Solid Surface w/ solid surface angled panel apron, and undermount sinks.

• Mirrors: Frameless w/ wall mounted lighting.

• Toilet Accessories: Provide all new Accessories and Waste

Receptacles as indicated.

• Toilet Partitions: Phenolic floor mounted, overhead braced, No

Sightline System.

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6.3.1.4 Third Floor Rose Room Pantry

• Floor: Luxury Vinyl Tile (Planks) Patch & Repair adjacent carpet, Provide resilient floor transition

• Ceiling: N/A

• Walls: Painted Drywall -Existing walls in Rose Room to receive new wall paint to match.

• Base: To match existing

• Countertops: Solid Surface w/ integral backsplash, waterfall edge where indicated on drawings.

• Cabinets (Base & Wall): Plastic Laminate

6.3.1.5 Third Floor Shared Office Pantry

• Floor: Luxury Vinyl Tile (Planks)

• Ceiling: Painted drywall soffit.

• Walls: Painted to match existing adjacent finish.

• Base: To match existing adjacent finish.

• Countertops: Solid Surface w/ integral backsplash

• Cabinets (Base & Wall): Plastic Laminate

6.3.2 EAST WING

All toilet rooms in the East Wing will receive new finishes, plumbing fixtures, and toilet accessories. Provide temporary construction walls where required.

6.3.2.1 Gender Neutral/Single Use Restrooms

• Ceiling: Acoustic Ceiling Tile (24x48)

• Walls: Full-height Ceramic Wall Tile, including metal edge trim at outside corners

• Base: Metal Cove Base

• Countertops: Solid Surface w/ solid surface angled panel apron, undermount sinks

• Mirrors: Frameless w/ Wall mounted Lighting

6.3.2.2 Restrooms

• Ceiling: Acoustic Ceiling Tile (24x48)

• Walls: Full-height Ceramic Wall Tile, including metal edge trim at outside corners

• Base: Metal Cove Base

• Countertops: Solid Surface w/ solid surface angled panel apron, undermount sinks

• Mirrors: Frameless w/ Wall mounted Lighting

• Toilet Accessories: Provide all new Accessories and Waste

• Toilet Partitions: Phenolic ceiling mounted, No Sightline System

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6.3.3 WEST WING

All toilet rooms in the West Wing will receive new finishes, plumbing fixtures, and toilet accessories. Provide temporary construction walls where required.

6.3.3.1 Gender Neutral/Single Use Restrooms

• Ceiling: Acoustic Ceiling Tile (24x48)

• Walls: Full-height Ceramic Wall Tile, including metal edge trim at outside corners

• Base: Metal Cove Base

• Countertops: Solid Surface w/ solid surface angled panel apron, undermount sinks

• Mirrors: Frameless w/ Wall mounted Lighting

6.3.4 RESTROOMS

• Ceiling: Acoustic Ceiling Tile (24x48)

• Walls: Full-height Ceramic Wall Tile, including metal edge trim at outside corners

• Base: Metal Cove Base

• Countertops: Solid Surface w/ solid surface angled panel apron, undermount sinks

• Mirrors: Frameless w/ Wall mounted Lighting

• Toilet Accessories: Provide all new Accessories and Waste Receptacles as

• Toilet Partitions: Phenolic ceiling mounted, No Sightline System

6.3.5 EAST COURT – FAMILY RESTROOM

The Family Restroom on the East Court, Second Floor, will receive new finishes, plumbing fixtures, and toilet accessories. Patch and repair disrupted finishes in adjacent spaces. Provide temporary construction walls where required.

• Ceiling: Acoustic Ceiling Tile (24x48)

• Walls: Full-height Ceramic Wall Tile, including metal edge trim at outside corners

• Base: Metal Cove Base

• Mirrors: Framed Mirror w/ wall mounted lighting.

• Toilet Accessories: Provide all new Accessories and Waste Receptacles as

6.3.6 WEST WING - THIRD FLOOR COPY ROOM

• Ceiling: Acoustic Ceiling Tile (24x48)

• Walls: Painted Drywall

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• Base: Rubber base

6.3.7 EAST AND WEST WING - FOURTH FLOOR COPY/MICROWAVE ROOM

• Ceiling: Acoustic Ceiling Tile (24x48)

6.3.8 WEST WING - FIFTH FLOOR COPY/MICROWAVE ROOM

• Ceiling: Acoustic Ceiling Tile (24x48)

6.3.9 CUSTODIAL CLOSETS

• Floor: Sealed Concrete

• Ceiling: No Ceiling - Exposed

• Walls: Epoxy Paint w/ Wall Protection Panels (4 -0 AFF)

6.3.10 CONSTRUCTION WALLS

• Walls: Paint w/ Graphics to be Coordinated and Provided by others

6.4 TOILET ACCESSORIES

6.4.1 RESTROOMS

All restrooms will receive the following toilet accessories:

Refer to standard toilet room mounting height sheet for toilet accessory requirements per stall.

• (1) TA-01 surface toilet tissue dispenser roll type per toilet

• TA-05 recessed hand dryer – at least (1) per restroom, see drawings for exact counts.

• (1) TA-07 surface mounted waste receptacle per restroom

• (1) TA-08 surface napkin / tampon vendor per women’s restroom

• (1) TA-10 surface napkin disposal per toilet in each women’s restroom

• TA-13 surface soap dispenser – at least (1) per restroom, see drawings for exact counts.

• (1) TA-16 surface seat cover dispenser per toilet

• (1) TA-19 mop strip per custodial closet

• (1) TA-20 framed mirror where indicated over wall mounted lavatories only

• (1) TA-23 surface baby changing station horizontal see drawings for locations

• TA-28 grab bar straight horizontal as required for accessible and ambulatory toilets.

• TA-29 grab bar straight vertical as required for accessible and ambulatory toilets.

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• Frameless mirrors 4’-0” high over length of counters see elevations for widths.

• Full-length mirror – at least (1) per toilet room

6.4.2 PANTRIES

Both Pantry areas will receive the following accessories:

• (1) TA-03 surface paper towel dispenser

• (1) TA-13 surface soap dispenser

7.0 STRUCTURAL

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7.1 APPLICABLE CODES AND STANDARDS

• IBC 2021 ICC International Building Code

• IEBC 2021 ICC International Existing Building Code

• IEBC 2021 International Building Code

• ACI 318-19 American Concrete Institute - Building Code for Structural Concrete

• ASCE 7-16 American Society of Civil Engineers - Minimum Design Loads and Associated

Criteria for Buildings and Other Structures

• AISC 360-16 American Institute of Steel Construction - Specification for Structural Steel

Buildings

• ASTM - American Society for Testing and Materials

• AWS D1.1 American Welding Society - Structural Welding Code for Steel

• TMS 402-16 The Masonry Society - Building Code Requirements for Masonry Structures

7.2 EXISTING CONDITIONS SUMMARY

The Natural History Museum structure consists of additions, renovations, and infills which have added to or modified the original building structural systems over its 100 plus year lifespan. The original main building consisted of a partial basement and three supported floors in three halls and two range spaces. The original structure was constructed with heavy masonry walls and piers bearing on unreinforced concrete spread footings. The floors consist of riveted steel plate columns and girders bearing on masonry piers. The steel structure supports segmental brick arch and concrete floors at the first-floor level and terracotta flat arches with concrete topping at the upper floors. The roof structure is a cast-in-place concrete one-way slab supported by reinforced concrete rafters and riveted steel trusses.

The east and west wing additions were added in 1960 and 1963 respectively as independent structural systems isolated from the main building with expansions joints. The building additions each consist of full basements and six supported floors constructed from cast-in-place concrete foundations and columns supporting concrete flat plate floors with drop panels at column locations.

Both main building courtyards have been infilled with structures tied into the original building walls and framing. Additional interstitial floor mezzanines have also been added over the years. These infill areas and mezzanines consist of a variety of different structural systems which can vary from steel or concrete framing with concrete slabs to wood or gage metal bearing walls and floors.

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7.3 DESIGN CRITERIA

7.3.1 RISK CATEGORY

IBC 2021 Table 1604.5 Risk Category III

7.3.2 DESIGN LIVE LOADS FOR STRUCTURE SUPPORTING NEW WORK

Public Rooms 100 psf

Corridors Serving Public Rooms 100 psf

7.3.3 SEISMIC LOAD CRITERIA

Seismic Importance Factor IE = 1.25

0.2 Sec Spectral Response Acceleration Ss = 0.133

1.0 Sec Spectral Response Acceleration S1 = 0.043

5% Damped Spectral Response Acceleration at Short Periods SDS = 0.142

5% Damped Spectral Response Acceleration at 1-Second Period SD1 = 0.069

Seismic Design Category B

7.3.4 MATERIALS FOR NEW WORK

Steel Wide Flange Sections, Channels, Angles ASTM A992 Gr. 50

Steel Plates ASTM A36 Gr. 36

7.4 STRUCTURAL SYSTEMS

7.4.1 STORM DRAINAGE ROUTING

In general, relocated storm drains will be rerouted horizontally to areas with vertical distribution of utilities where existing penetrations or shaft openings through floor systems can be used. The horizontal routing of piping to these areas may require penetrations through existing clay tile or CMU walls. It is anticipated that these wall penetrations will be small enough to not require reinforcement of the walls around these penetrations. However. If any area of clay tile wall is determined to be too unstable for a penetration, it may be necessary to locally demolish sections of wall and replace with a gypsum on cold formed metal framing or CMU wall in the same location.

7.4.2 RESTROOM AND PANTRY RENOVATIONS

The renovation of the existing restrooms will improve or keep the number of fixtures the same as existing, which will allow the reuse of the existing utility routing. It is anticipated that there are limited locations where restroom and pantry layouts will require relocated chase areas and additional or relocated floor drains. These special conditions will require some additional work at the floor penetrations.

7.4.3 FLOOR PENETRATIONS THROUGH EXISTING FLOOR ASSEMBLIES

Where proposed work cannot utilize existing floor openings and requires a penetration through the existing floor, careful coordination with existing floor assemblies will be required.

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If the work occurs in an area of the original segmental brick arch construction or terra cotta flat arches, steel frames consisting of angle or channel members may be required around the proposed openings. Frames must be installed, spanning between existing steel beams, prior to cutting penetrations to support the areas of the brick arch system which will be disturbed. Openings must be coordinated to avoid tie rod locations. Tie rods must remain unless the complete floor system is removed and replaced as described below. Larger openings or groups of smaller penetrations may require a section of the floor system to be removed entirely between main framing members and replaced with a concrete slab on metal deck.

7.4.4 ACCESS TO SERVICE TUNNELS

Existing hatches into many of the service tunnels are too small or congested to allow reasonable access to areas required to complete the proposed work. These hatches will either be enlarged, or new hatches will be added in areas where work will need to be completed. The structural cover on the existing tunnels is an approximately 9 thick concrete slabs reinforced with expanded steel mesh. Angle frames will be installed on all sides of new or enlarged openings and anchored into the underside of the existing slab.

7.4.5 UTILITY AND PARTITION SUPPORT FRAMING

In areas of work within the Main Building where floors are comprised of brick or terra cotta assemblies, as described in Section 8.2, MEP and Architectural systems are not permitted to be supported by or braced to the floor assembly. Connections must only be made to the steel framing members. This work will require the local removal of plaster ceilings to allow steel hanger tabs to be welded onto the existing beam’s bottom flange. All exposed steel must be covered after installation by spray fire resistant material or intumescent coatings at the architect’s direction to restore the existing floor’s fire rating.

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In many areas, the existing framing may not be located close enough to where supports are required. At these locations, supplemental framing between existing beams or slotted channel framing members will be required. In areas with particularly dense MEP and partition requirements it may be preferred to install a suspended grid of slotted channel framing in the whole space to allow more flexibility in the layout of the supported systems.

8.0 MECHANICAL

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8.1 APPLICABLE CODES AND STANDARDS

The following codes and guidelines have been referenced.

• International Building Code (IBC) 2021 Edition

• International Existing Building Code (IEBC) 2021 Edition

• International Mechanical Code (IMC) 2021 Edition

• International Energy Conservation Code (IECC) 2021 Edition

• ASHRAE standard 62.1 2022 Edition

• ASHRAE standard 90.1 2022 Edition

• ASHRAE HVAC Fundamentals Handbook

• ASHRAE HVAC Applications Handbook

• ASHRAE HVAC Systems and Equipment Handbook

• NFPA -All applicable codes and standards

• Energy Policy Act (EPACT)

• SMACNA Duct Standards - All applicable standards (including duct leakage)

• (ASME) American Society of Mechanical Engineers -All related documents

• (ASTM) American Society for Testing and Materials International -All related documents

• (ANSI) American National Standards Institute -All related documents

• Smithsonian Standards and Guidelines, including:

▪ Fire Protection and Life Safety Design Manual

▪ Smithsonian Facilities Design Standards

8.2 EXISTING CONDITIONS

The West Wing Southwest bathrooms are served by a common exhaust shaft for all floors up to toilet exhaust fan E-40 in the penthouse. The West Wing Northeast bathrooms are also served by a common exhaust shaft up to toilet exhaust fan E-48 in the penthouse.

The Northeast bathrooms on the fourth and sixth floors have exterior exposure and are provided with hot water finned tube heating. The West Wing ground, first, and second floor have been renovated within the last 15 years and bathrooms are currently provided with supply air from terminal units.

The East Wing Northwest bathrooms are served by a common exhaust shaft for all floors up to toilet exhaust fan E-15 located in the penthouse. The northwest bathrooms on the second, fourth, and sixth floors have exterior exposure and are provided with hot water-finned tube heating. The East Wing Southeast bathrooms are served by a common exhaust shaft up to toilet exhaust fan E-17 located in the penthouse.

Large supply and return duct mains run throughout the attic. Branch ducts with terminal equipment serve halls below. Existing storm piping is located next to ductwork mains and above or below branch ductwork.

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8.3 DESIGN CRITERIA

8.3.1 CLIMATE CONDITIONS

Site Location Washington, District of Columbia

38.892o Lat., 77.03o Long., 6.6 ft. (2 m) Elevation

Climatic Location Reagan International Airport, VA

38.847 o Lat., 77.035o Long., 10 ft. (3 m) Elevation

Climate Zone 4A

Summer

Dry Bulb Temp1 94.5o F (34.7 o C)

Coincident Wet Bulb1 75.6o F (24.2 o C)

Enthalpy1 38.986 BTU/lb (90.68 kJ/kg)

Evaporative Wet Bulb2 78.4o F (25.8 o C)

Coincident Dry Bulb2 89.1o F (31.7 o C)

Enthalpy2 41.878 BTU/lb (97.41 kJ/kg)

Dehumidification DP3 6o F (24.2 o C)

Coincident Dry Bulb3 83.3o F (28.5 o C)

Enthalpy3

Winter 41.098 BTU/lb (95.59 kJ/kg)

Dry Bulb Temperature4: 17.1o F (-8.3 o C)

1Source: 2021 ASHRAE Fundamentals 0.4% Cooling Design Condition for peak dry bulb and mean coincident wet bulb.

2Source: 2021 ASHRAE Fundamentals 0.4% Cooling Design Condition for peak wet bulb and mean coincident dry bulb.

3Source: 2021 ASHRAE Fundamentals 0.4% Cooling Design Condition.

4Source: 2021 ASHRAE Fundamentals 99.6% Heating Design Condition.

8.3.2 VENTILATION

Exhaust air quantities for the spaces will be in accordance with ASHRAE 62.1

2022 Ventilation for Acceptable Indoor Air Quality.

8.3.3 INDOOR DESIGN CRITERIA

Room conditions will be designed for a minimum of 68°F +/- 1.5 F (20°C +/-

.825°C).

8.4 HVAC LOADS

All load calculations will be performed utilizing state-of-the-art hourly energy load computer simulations (Carrier HAP v5.11 software). Computer simulation software will calculate loads in accordance with ASHRAE Standard 183. Reference Appendix A for hand load calculations.

Lighting loads are assumed to be compliant with previous ASHRAE 90.1 minimum lighting power densities. Safety factors of 10% for heating and cooling are used to account for variance.

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Units are sized according to worst-case outside air conditions based on enthalpy, which is evaporative 0.4%.

8.5 COOLING AND HEATING PLANTS

Existing hot water heating plant will be utilized for new equipment to the maximum extent possible. The hot water entering temperature is 180” F (82.2”C).

8.6 HVAC SYSTEMS

For each renovated bathroom, the branch exhaust and supply ductwork will be removed back to the tie in point at the existing main and existing air devices will be removed. Pre-

Demolition airflow measurements will be made on each floor to confirm existing airflows.

New branch ductwork will be installed and connected to new air devices within the bathroom as needed. Exhaust airflows will be increased as needed to comply with updated code minimum exhaust rates. Existing fans will be rebalanced as needed for change in airflow. Existing finned tube will be demolished and replaced with new electric radiant panels in bathrooms with exterior exposure. Hot water piping will be altered as needed.

Ductwork, piping, and air devices will need to be relocated and/or replaced as needed for new storm piping installation. Areas of particular concern for ductwork coordination are the

Northwest, Northeast, and North side of West Hall sections of the Attic. These locations have a significant amount of ductwork and little space to relocate. Refer to the 100%

Construction Documents drawings for the extent of duct rerouting required. See pictures of example locations below:

Branch duct above storm in Northwest attic (Northeast similar)

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West Hall North side branch ductwork in path of extended storm

West Hall South side branch ductwork in path of new storm

East Hall South Side Duct Conflicts with rerouted storm

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8.7 HVAC CONTROLS

All new equipment requiring controls will connect to the existing SI BAS system through

BACnet.

8.8 COMMISSIONING

All existing equipment altered, relocated, or replaced shall be pre-commissioned to determine pre-demolition airflow and proper operation. After the final construction phase is complete and the equipment is returned to normal operation, the system shall be recommissioned.

9.0 PLUMBING

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9.1 APPLICABLE CODES AND STANDARDS

The latest edition of the following codes and standards shall be used, except where a specific version is listed. Where a deviation or conflict occurs, the more stringent code or standard shall be applied.

• Smithsonian Institution Facilities Design Standards - 2021 Edition.

• International Plumbing Code (IPC) - 2021 edition

• International Energy Conservation Code (IECC) - 2021 edition

• International Building Code (IBC) 2021 Edition

• International Existing Building Code (IEBC) 2021 Edition

• International Energy Conservation Code (IECC) 2021 Edition

• ASHRAE standard 90.1 2022 Edition

• NFPA - All applicable codes and standards

• Energy Policy Act (EPACT)

• (ASTM) American Society for Testing and Materials International - All related documents

• (ANSI) American National Standards Institute - All related documents

• Smithsonian Institution, Office of Facilities and Operations, Codes, Standards and

Guidelines - Latest edition

• Smithsonian Sustainability Plans - Latest edition

• 10 CFR 434 - Energy Code for New Federal Commercial and Multi-Family High-Rise

Residential Buildings. Plumbing Drainage Institute Standard PDI-WH-201, Appendix A, Domestic Water System Sizing.

• DC Water and Sewer Authority (DCWASA) Requirements

9.2 EXISTING CONDITIONS ASSESSMENT (IMPLEMENTATION PHASE)

The Design Team was tasked with providing an extensive implementation study to determine the conditions of the existing sanitary, vent and storm systems that serve the

NHB. Over the course of two years, it was discovered the systems had in most cases exceeded their life expectancy and action would be necessary to upgrade those systems.

Although there are areas that have been renovated over the years and have had the sanitary and vent systems modified or replaced, there are storm piping systems that have been left untouched behind walls in sensitive areas that need to be addressed as well…