Project 1. B2261 StearleyHeights Planning Charrette.pdf

Conceptual Charrette Report

Stearley Heights Admin Conversion Study - Conceptual Charrette Report, Kadena AB, Japan ii

Table of Contents

1 Introduction .................................................................................................................................................................. 1-1

1.1 Purpose of Conceptual Charrette Report .................................................................................................. 1-1

1.2 Project Overview .................................................................................................................................................. 1-1

1.2.1 Purpose and Scope .......................................................................................................................... 1-1

1.2.2 Description of Proposed Construction ..................................................................................... 1-2

1.2.3 Analysis of User Requirements ................................................................................................... 1-3

2 Primary Facilities ......................................................................................................................................................... 2-1

2.1 User Information and Space Analysis ......................................................................................................... 2-1

2.1.1 Facility Descriptions ........................................................................................................................ 2-1

2.1.2 Renovation Sketches ....................................................................................................................... 2-1

2.2 Parametric Design Analysis ............................................................................................................................ 2-4

2.2.1 Structural ............................................................................................................................................. 2-4

2.2.2 Architectural ....................................................................................................................................... 2-6

2.2.3 Conveying ......................................................................................................................................... 2-11

2.2.4 Plumbing .......................................................................................................................................... 2-11

2.2.5 Heating, Ventilation, and Air Conditioning ......................................................................... 2-11

2.2.6 Fire Protection and Life Safety ................................................................................................. 2-13

2.2.7 Electrical/Communications ....................................................................................................... 2-17

2.2.8 Additional Mechanical, Electrical, and Plumbing Requirements ................................ 2-19

2.2.9 Antiterrorism ................................................................................................................................... 2-19

2.2.10 Sustainability Requirements ..................................................................................................... 2-19

2.2.11 Cybersecurity ................................................................................................................................... 2-20

2.2.12 Airfields ............................................................................................................................................. 2-20

2.2.13 Design Guidelines .......................................................................................................................... 2-20

3 Supporting Facilities ................................................................................................................................................... 3-1

3.1 Other User or Mission Facilities ..................................................................................................................... 3-1

3.2 Site/Civil ................................................................................................................................................................. 3-1

3.2.1 General ................................................................................................................................................. 3-1

3.2.2 Facility Demolition ........................................................................................................................... 3-1

3.3 Site Preparation ................................................................................................................................................... 3-1

3.4 Site Improvements ............................................................................................................................................. 3-1

3.4.1 Landscaping ....................................................................................................................................... 3-1

3.5 Site Utilities Requirements .............................................................................................................................. 3-1

3.5.1 Water Supply ...................................................................................................................................... 3-1

3.5.2 Sanitary Sewer ................................................................................................................................... 3-1

Stearley Heights Admin Conversion Study - Conceptual Charrette Report, Kadena AB, Japan iii

3.5.3 Stormwater ......................................................................................................................................... 3-1

3.6 Airfield Lighting and Navigational Aids ..................................................................................................... 3-2

4 Equipment From Other Appropriations ................................................................................................................. 4-3

4.1 User and Mission Requirements ................................................................................................................... 4-3

4.2 Equipment Details .............................................................................................................................................. 4-3

4.2.1 Prewired Work Stations .................................................................................................................. 4-3

4.3 Information Systems Requirements ............................................................................................................ 4-3

4.4 Non-RPIE Generators/Uninterruptible Power Supply/Other Backup Power Storage or

Capability ............................................................................................................................................................... 4-3

4.5 Other Equipment Items .................................................................................................................................... 4-3

4.6 Raised Access Flooring ..................................................................................................................................... 4-3

4.7 TEMPEST/HEMP/RF Shielding ...................................................................................................................... 4-3

4.8 Intrusion Detection System ............................................................................................................................ 4-3

4.9 Closed Circuit TV ................................................................................................................................................. 4-4

4.10 Other User Equipment ...................................................................................................................................... 4-4

5 Other Scope/Cost Considerations ........................................................................................................................... 5-1

5.1 Environmental Issues ........................................................................................................................................ 5-1

5.2 Unexploded Ordnance, Cultural, and Real Estate Issues .................................................................... 5-2

5.3 Site Accessibility .................................................................................................................................................. 5-2

5.4 Construction Security ........................................................................................................................................ 5-2

5.5 Construction Phasing ........................................................................................................................................ 5-2

5.6 Temporary User Space ..................................................................................................................................... 5-2

5.7 Approvals/Exemptions/Waivers ................................................................................................................... 5-3

7 Appendices .................................................................................................................................................................... 7-1

Appendix A Acronyms

Appendix D Concept Drawings

Appendix E Site and Facility Photos

Stearley Heights Admin Conversion Study - Conceptual Charrette Report, Kadena AB, Japan iv

Appendix G Sustainability Requirements Scorecard

List of Tables

Table 1-1: Convert Stearley Heights School and Gym B2261, B2279, and B2285 ...........................................................1-2 Table 5-1: Environmental Permits..........................................................................................................................................................5-1 Table 5-2: Hazardous Substance and Abatement Requirements ..............................................................................................5-2

List of Figures

Figure 2-1: Preferred COA – First Floor ................................................................................................................................................2-2 Figure 2-2: Preferred COA – Second Floor ..........................................................................................................................................2-3

Stearley Heights Admin Conversion Study - Conceptual Charrette Report, Kadena AB, Japan 1-1

1 Introduction

1.1 Purpose of Conceptual Charrette Report

This Conceptual Charrette Report (CCR) documents the validation process for the Stearley Heights Admin

Conversion Study at Kadena Air Base (AB), Japan. Jacobs was contracted by the U.S. Army Corps of Engineers

(USACE), Tulsa District, under Contract W912BV-19-D-0008, Task Order W912BV-23-F-0057, to validate the scope, requirements, and cost for the project. The objective of the effort is to clearly define and confirm project requirements, scope, cost, and criteria. It also provides the conceptual framework for executing the project as required by the user. Active involvement by the building users during all phases of design and construction is essential to ensure the facility meets all functional requirements. The Design Agent (DA) is responsible for verifying the accuracy of the information contained within this document.

The Jacobs team first reviewed the statement of work provided in the request for proposal and, in April 2023, the task was awarded. The project stakeholders attended a monthly teleconference meeting for the Kadena AB task orders until the planning charrette for the Stearley Heights Admin Conversion Study was scheduled. Additional project information was obtained from the 718th Civil Engineering Squadron (718 CES) prior to the planning charrette, which was held on 16 to 18 January 2024 at Kadena AB. The out-brief for the Admin Conversion Study occurred on 18 January 2024 at Kadena AB to inform the stakeholders of the general condition of the facility and to present three courses of action (COAs). From the three COAs, a Preferred COA was selected and was used as the basis for this report, which documents the findings and subsequent analysis of requirements to bring the facility up to building code standards and meet the requirements set forth by the Kadena AB stakeholders.

1.2 Project Overview

1.2.1 Purpose and Scope

The 718 CES is in the project validation stage of evaluating the existing Stearley Heights Elementary School

(Building [B]2261), Gymnasium (B2279), and Utility building (B2285) at Kadena AB to determine how the existing spaces best suit the needs for administrative space. This project provides a visual assessment of the existing conditions and provides renovation and repair recommendations for three COAs. The COAs were developed with three paths, one COA with no significant changes, one with minimal changes, and one COA with significant changes. The visual investigations included structural, architectural, mechanical, plumbing, electrical, communication, and fire protection review and analysis.

The charrette sessions included a review of the visual investigation of the selected buildings. The functional requirements for the facility were gathered from the stakeholders and subject matter experts during the charrette work sessions and site tours and they were developed further by the Jacobs team. The goal of the charrette work sessions was to define the scope of renovation needed to bring the building up to the appropriate building code and Unified Facilities Criteria (UFC) standards.

It was confirmed by 718 CES during the planning charrette that the project will take place during Fiscal Year

2024, and that the funding stream will be centralized Operations and Maintenance (O&M). Additionally, the category code is 610-100 Administrative Office, Misc.

The renovation scope was reviewed and validated during discussions with building users by applying guidance from applicable sections in Department of the Air Force Manual (DAFMAN) 32-1084, Facility Requirements

Standards, and UFC standards. Additional requirements were based on user input and existing conditions. Table

1-1 presents the project scope information.

Stearley Heights Admin Conversion Study - Conceptual Charrette Report, Kadena AB, Japan 1-3 reconfiguring the northwest quadrant existing administrative area with an efficient administrative concept of open and private office suites, toilets, and a lactation room. Additional work includes removing the existing stove, selective demolition, selective patch-and-repair finishes, and painting the interior.

Further detail on the renovation recommendations for each building are captured in Section 2.3, Parametric

Design Analysis, per the individual discipline narratives. The plan for the repairs was developed through interactive work sessions with the stakeholders to ensure that the repair items would be aligned with the planned administrative use for the facilities at Kadena AB, as well as mitigating building code and UFC deficiencies discovered during the facility walkthroughs and subsequent analysis.

1.2.3 Analysis of User Requirements

The purpose of this project is to renovate the existing Stearley Heights Elementary School and gymnasium to convert the primary use to an administrative facility to enable the 718 CES additional area for office space functions to meet the growing demand at Kadena AB. Currently, all surveyed facilities have sufficient structural, life safety, and electrical systems, with major deficiencies in the mechanical systems and fire protection systems.

The mechanical system has deteriorated because of harsh climatic conditions and excessive use without consistent maintenance.

During the charrette, three COAs were developed and presented to 718 CES leadership and stakeholders for review and selection of the Preferred COA. The Preferred COA was selected after the charrette out-brief on

18 January 2024. A summary of the scope of the initial three COAs follows.

COA 1 includes:

▪ Fire Protection:

o Install a new wet pipe sprinkler system throughout entire facility (fire pump and storage tank required) o Install a new fire alarm/MNS throughout entire facility o Add exit signage as necessary

▪ Electrical:

o Add circuits and receptacles to building to support additional users o Replace fluorescent fixtures with LED fixtures o Add emergency lighting as necessary

▪ Electrical changes supporting other disciplines o Communications:

• Add Cat6 work area outlets and distribution to support additional users, up to 288 total ports

▪ Mechanical:

o Recommission the existing mechanical systems (air and water side) o Clean all existing duct systems o Perform asbestos abatement from existing piping insulation o Demolish the nonfunctioning boilers

▪ Plumbing:

o Scope the waste system to identify and correct any broken or blocked pipes o Implement a secondary roof drainage system o Remove toilets and wall-hung sinks and lavatories within classrooms o Provide instantaneous water heaters for group toilets

▪ Structural:

o Repair concrete spalling below a blank-off louver in the upper mechanical room o Add 3-inch diameter scuppers by core-drilling parapet walls at low ends of the roof areas.

Apply an elastomeric protection inside the cored area.

▪ Architectural:

o Assume 170 personnel per floor for a total occupancy of 340

1541162751U Cross-Out

Stearley Heights Admin Conversion Study - Conceptual Charrette Report, Kadena AB, Japan 1-4 o Add a secure café on each floor o Assume two conference rooms per floor o Assume approximately 12 administrative personnel per classroom o Replace roof drain strainers and add overflow scupper openings o Add access ladder to low roof area (trapezoid) o Install new suspended ACT throughout o Plan for selective interior paint and patch finishes o Remove stove in B2261 first-floor kitchen o Incorporate lactation room o Remove traditional tatami mat room o Use existing kitchen and/or sink areas for reuse as break rooms

COA 2 includes:

▪ Fire Protection:

o Install a new wet pipe sprinkler system throughout entire facility (fire pump and storage tank required) o Install a new fire alarm/MNS throughout entire facility o Add exit signage as necessary

▪ Electrical:

o Add circuits and receptacles to building to support additional users o Replace fluorescent fixtures with LED fixtures o Add emergency lighting as necessary o Perform electrical changes to support other disciplines

▪ Communications:

o Add fiber optic service cabling o Remove abandoned/underused communications cabling o Add communications infrastructure to support maximum design capacity of users o Add wireless data

▪ Mechanical:

o Update the control system and connect it to the Base Automated Logic System o Replace existing air handlers, fans, and pumps

▪ Plumbing:

o Replace all plumbing fixtures with new low-flow type units o Remove sinks built into the existing cabinets

▪ Structural:

o Repair concrete spalling below a blank-off louver in the upper mechanical room o Add 3-inch diameter scuppers by core-drilling parapet walls at low ends of the roof areas;

apply elastomeric protection inside the cored area

▪ Architectural:

o All of COA 1 items plus the following:

• Replace flooring throughout

• Demolish cabinets/sink in each classroom

• Replace windows to improve energy efficiency

• Repurpose gymnasium as a storage area

COA 3 includes:

▪ Fire Protection:

o Install a new wet pipe sprinkler system throughout entire facility (fire pump and storage tank required)

1541162751U Cross-Out

Stearley Heights Admin Conversion Study - Conceptual Charrette Report, Kadena AB, Japan 1-5 o Install a new fire alarm/MNS throughout entire facility o Add exit signage as necessary

▪ Electrical:

o Add circuits to building to support additional users o Replace fluorescent fixtures with LED fixtures o Add emergency lighting as necessary o Replace lighting controls per energy code o Replace electrical breakers o Perform electrical changes to support other disciplines o Service transformer replacement

▪ Communications:

o Build out telecommunications spaces o Provide new backbone infrastructure o Provide new communications infrastructure to support maximum design capacity of users o Add wireless data o Add intrusion detection and access control to utility spaces o Build out common conference/video teleconference space

▪ Mechanical:

o Perform a total upgrade to the mechanical system, including redesign of the system to variable volume type and addition of a dedicated outdoor air system (DOAS) o Perform upgrades to the building thermal envelope

▪ Plumbing:

o Redesign and replace the entire plumbing system to meet the requirements of the current codes and UFCs, including the Americans with Disabilities Act (ADA)/Architectural Barriers Act

(ABA) requirements

▪ Structural:

o Level the music room by placing a 4-inch reinforced concrete slab on styrofoam o Strengthen the second-floor areas designed for 40 pounds per square foot (psf) live load to 50 psf live load o Perform a detailed lateral analysis of the building for current code requirements and strengthen where needed

▪ Architectural:

o Assume all COA 1 and COA 2 changes, as modified with the following:

• Increase maximum occupancy for second floor

• Replace all finishes

• Infill music room floor to match existing finish floor elevations

• Replace/add perimeter wall/roof insulation to match energy code requirements

• Demolish small toilet room and closet rooms

• Incorporate new dedicated electrical and communications rooms

• Create new partitions at the central open area to facilitate office area

• Add fall protection to roof

• Update central toilet facilities with new finishes to meet ABA standards

The Preferred COA was selected after discussion of the three COAs, which resulted in elements from COA 1 and

COA 3 combined to form the Preferred COA. As a note, since the fire protection/sprinkler system is required for any change of use, the fire protection scope is the same for each COA. The electrical, communication, and plumbing scope items were taken from COA 1. The mechanical scope for the selected COA was taken from COA

3. Lastly, structural and architectural scope items were taken from both COA 1 and COA 3. The following provides a summary of the Preferred COA. Appendix D contains the charrette concept renovation drawings for each COA for reference.

Stearley Heights Admin Conversion Study - Conceptual Charrette Report, Kadena AB, Japan 1-6

Preferred COA:

▪ Fire Protection o Install a new wet pipe sprinkler system throughout entire facility (fire pump and storage tank required) o Install a new fire alarm/MNS throughout entire facility o Add exit signage as necessary

▪ Electrical:

o Add circuits and receptacles to building to support additional users o Replace fluorescent fixtures with LED fixtures o Add emergency lighting as necessary o Perform electrical changes to support other disciplines

▪ Communications:

o Add Cat6 work area outlets and distribution to support additional users, up to 288 total ports

▪ Mechanical:

o Update the control system and connect it to the Base Automated Logic System o Replace existing air handlers, fans, and pumps o Perform a total upgrade to the mechanical system, including redesign of the system to variable volume type and addition of a DOAS o Perform upgrades to the building thermal envelope (roof)

▪ Plumbing:

o Scope the waste system to identify and correct any broken or blocked pipes o Implement a secondary roof drainage system o Remove toilets and wall-hung sinks and lavatories within classrooms o Provide instantaneous water heaters for group toilets

▪ Structural:

o Repair concrete spalling below a blank-off louver in the upper mechanical room o Add 3-inch diameter scuppers by core-drilling parapet walls at low ends of the roof areas;

apply elastomeric protection inside the cored area o Level music room by placing a 4-inch reinforced concrete slab on styrofoam o Limit the live loads in the existing classrooms on the second floor to 40 psf to avoid the need for detailed floor analysis or strengthening to be fully used for 50 psf as required by UFC for office spaces o Consider a complete lateral analysis for wind and seismic loading, which could be grandfathered if the building is maintained at similar loading

▪ Architectural:

o Maximize personnel, assume +/- 170 personnel per floor for a total occupancy of approximately 340 o Add a secure café on each floor o Add two conference rooms per floor o Assume approximately 12 administrative personnel per classroom o Replace roof drain strainers and add overflow scupper openings o Add access ladder to low roof area (trapezoid) o Install new suspended ACT throughout o Perform a selective interior patch and repair of finishes o Remove stove in B2261 first-floor kitchen o Incorporate a lactation room o Remove traditional tatami mat room o Reuse existing kitchen and sink areas as break rooms

Stearley Heights Admin Conversion Study - Conceptual Charrette Report, Kadena AB, Japan 1-7 o Renovate the northwest corner of the space to create an open office with private suites; add a men’s and women’s toilet, break room, and lactation room, and small electrical room since these areas were demolished to make room for the open office o Add spray-applied insulation to the underside of the roof structure o Add a communications room to the second floor o Paint the interior

Stearley Heights Admin Conversion Study – Conceptual Charrette Report, Kadena AB, Japan

2-1

2 Primary Facilities

2.1 User Information and Space Analysis

2.1.1 Facility Descriptions

2.1.1.1 Stearley Heights Elementary School, B2261

Building 2261 is an existing 58,069 SF former elementary school referred to as Stearley Heights Elementary

School. The purpose for this project is to renovate the existing school classrooms and associated support rooms into an administration office facility ready for the Air Force tenants to occupy and fulfill their mission. The interior of the facility is generally in good condition; therefore, the scope items are intended to bring value by providing efficient and cost-effective recommendations to get the Stearley Heights Elementary School up and running into an administration facility so the 718 CES can assign groups in need of short- and long-term office space.

The primary drivers used in developing the Preferred COA are as follows:

▪ Maximize the number of personnel that can occupy the facility o The Preferred COA shows 177 personnel on the first floor and 170 personnel on the second floor, for a total occupancy of 347 (note that expanding the parking for the building is not included in the scope and it will limit the number of people who can be assigned)

▪ Designate a room on each floor that can be used as a secure café

▪ Designate two conference rooms per floor

▪ Target +/- 12 personnel for each existing classroom for admin conversion

▪ Use the existing kitchen/kitchenette areas for the proposed break rooms to capitalize on the existing plumbing and infrastructure already in place

▪ Assume normal operating hours are 06:30 to 18:00

▪ Assume reuse of existing furniture provided by government; no equipment is expected

2.1.1.2 Stearley Heights Gymnasium/Cafeteria, B2279

The existing gymnasium and cafeteria building is 10,620 SF and will remain as a gymnasium for the community.

The existing seating for the cafeteria is no longer in use and the kitchen area is currently being used as storage, so it will remain as such. No scope items for B2279 are included in this effort.

2.1.1.3 Utility Building, B2285

The utility building is 1,291 SF and contains the chiller water pumps and heat exchangers for the school. These will be replaced as part of the HVAC recommendations for this project.

2.1.2 Renovation Sketches

The graphics presented on the following pages depict conceptual facility plans based on the information-gathering, stakeholder input, and analytical processes of the charrette and post-charrette planning activities.

The recommended renovation scope items are primarily interior; therefore, conceptual floor plans are presented, and the existing site will remain as is currently configured. The following diagrams represents the Preferred COA.

The building configurations depicted in this concept are based on stakeholder input, flexibility of user group functions, adaptability for future missions, and total building utilization. Building concepts identify the planning analyses for each of the functional areas of each facility and establish the foundation for further development during the design phase. Jacobs assumes that the final design concept will comply with relevant codes and criteria, as well as other applicable guidelines.

Stearley Heights Admin Conversion Study – Conceptual Charrette Report, Kadena AB, Japan 2-2

Figure 2-1: Preferred COA – First Floor

Stearley Heights Admin Conversion Study – Conceptual Charrette Report, Kadena AB, Japan 2-3

Figure 2-2: Preferred COA – Second Floor

2-4

2.2 Parametric Design Analysis

This section provides a conceptual-level narrative that describes identified requirements and notional design features or assumptions made for cost-estimating purposes. The DA is responsible for the final design solution to meet the project requirements.

2.2.1 Structural

2.2.1.1 Stearley Heights Elementary School, B2261

The existing facility is a two-story building with cast-in-place load-bearing concrete walls and cast-in-place concrete framing for the second floor and roof. The ground floor consists of cast-in-place reinforced slab-on-grade.

The rigid perimeter walls comprise the lateral force resisting system in all directions. The concrete rigid frames structural system transfers lateral loads to the foundations.

2.2.1.1.1 Substructure General Requirements

The foundation system for this building consists of shallow spread footings for the interior concrete columns and continuous footings for the concrete walls. No foundation movement was observed. The elevated slabs and the concrete slab-on-grade appear to be in good condition.

2.2.1.1.2 Superstructure and Roof General Requirements

The second and roof floor framing consists of cast-in-place reinforced concrete slab spanning between concrete columns and concrete walls. The existing facility comprises a two-story cast-in-place concrete framed structure with interior cast-in-place concrete columns and walls and perimeter cast-in-place concrete walls and columns to support the elevated cast-in-place concrete slabs at the second floor and roof. The lateral force resisting system consists of cast-in-place concrete shear walls in both directions.

The second floor and roof system consist of cast-in-place concrete slabs supported by cast-in-place concrete beams, which frame between cast-in-place concrete walls and columns. The rigid perimeter walls and columns comprise the lateral force resisting system in all directions. The concrete rigid frames structural system transfers lateral loads to the foundation.

2.2.1.1.3 Structural Modifications and Repairs

This existing facility is in a high seismic area with Seismic Design Category E designation. It can be subjected to winds up to 283 miles per hour for Risk Category II, based on current UFC requirements. Based on seismic and wind forces, lateral loads are resisted by the concrete wall rigid frames. Because this facility was designed and built between 1984 and 1986 to function as a school, and the proposed conversion/study is to change the occupancy to function as an administrative space, a more in-depth structural analysis is recommended to verify if any structural upgrade is required.

The initial occupancy of the second floor was to be used for classrooms, which were designed for 1.9 kilopascals

(kPa) (40 psf) uniform live load. The proposed use as offices requires a design load of 2.4 kPa (50 psf) plus partition loads. It is recommended that an evaluation of the second-floor structural system be performed to verify if the existing system is capable of supporting the higher loads. If it is determined that it cannot support the higher loads, a strengthening program will be recommended.

The existing music room has two concrete stairs to access a lower floor and step floors up to ground floor. This area will be leveled by infilling the low space and pouring a concrete slab at the same elevation of the ground floor.

2-5

For the upper mechanical room that is accessed from the roof, it was observed that the concrete wall below a blank-off louver is experiencing some concrete spalling and rusted rebar caused by water leakage. The wall area of approximately 1.2 square meters needs to be repaired.

When it rains, it was observed that large quantities of water accumulate at the lower portion of the sloped roof. It is recommended that some 3-inch (75 millimeter [mm]) diameter holes be core drilled throughout the parapet walls to allow water to drain. The exposed cored holes should be protected with an elastomeric membrane of the same color as the building to protect the concrete and any reinforcing steel that is cut.

2.2.1.1.4 Seismic Design Requirements

The project site is in a high seismic area with a Seismic Design Category E designation. Based on seismic forces, lateral loads should be resisted by the concrete wall rigid frames. All nonstructural components should require seismic bracing. A seismic evaluation in accordance with American Society of Civil Engineers (ASCE) Standard 41 should be performed for the entire building during the design/evaluation phase.

2.2.1.1.5 Structural Antiterrorism Requirements

Protective measures as specified by the current Department of Defense (DoD) Minimum Antiterrorism Standards for Buildings (UFC 4-010-01) are required for this facility. However, since the conversion cost is estimated to be less than 50% of the estimated replacement cost (ERC), these protective measures will not apply for this effort.

Because the structure is less than three stories in height, it is not required to be evaluated to resist progressive collapse in accordance with UFC 4-023-03.

2.2.1.1.6 Special Structural Requirements

Per UFC 1-200-01, Chapter 4, Kadena AB has an Environmental Severity Classification (ESC) of C5. The corrosive environment in Okinawa, Japan, must be considered to protect the rebar and steel from rusting.

2.2.1.2 Stearley Heights Gymnasium/Cafeteria, B2279

The existing facility consists of a single high-bay building with cast-in-place load-bearing concrete walls and cast-in-place concrete framing for the roof. The ground floor consists of cast-in-place reinforced slab-on-grade.

The rigid perimeter walls comprise the lateral force resisting system in all directions. The concrete rigid frames structural system transfers lateral loads to the foundations.

2.2.1.2.1 Substructure General Requirements

The foundation system consists of pile and pile caps to support the upper framing, but no foundation movement was observed. The slabs are concrete slab-on-grade, which appear to be in good condition.

2.2.1.2.2 Superstructure and Roof General Requirements

The roof framing consists of cast-in-place reinforced concrete slab spanning between concrete walls. The lateral force resisting system consists of cast-in-place concrete shear walls in both directions.

2.2.1.2.3 Structural Modifications and Repairs

It is anticipated that no structural modifications will be required for this facility.

2.2.1.2.4 Seismic Design Requirements

This existing facility is in a high seismic area with a Seismic Design Category E designation. Based on seismic forces, lateral loads should be resisted by the concrete wall rigid frames. All nonstructural components should require seismic bracing.

2-6

2.2.1.2.5 Structural Antiterrorism Requirement

Protective measures as specified by the current DoD Minimum Antiterrorism Standards for Buildings (UFC 4-

010-01) are required for this facility. However, protective measures will not apply to this effort. Because the structure is less than three stories in height, it is not required to be evaluated to resist progressive collapse in accordance with UFC 4-023-03.

2.2.1.2.6 Special Structural Requirements

Per UFC 1-200-01, Chapter 4, Kadena AB has an ESC of C5. The corrosive environment in Okinawa, Japan, must be considered to protect the rebar and any miscellaneous steel elements from rusting.

2.2.1.3 Utility Building, B2285

The existing facility consists of a single-story building with cast-in-place load-bearing concrete frame and infill precast walls and steel framing for the roof. The ground floor consists of cast-in-place reinforced slab-on-grade.

The rigid perimeter concrete framing comprises the lateral force resisting system in all directions. The concrete rigid frames structural system transfers lateral loads to the foundations.

2.2.1.3.1 Substructure General Requirements

The foundation system consists of shallow continuous footing to support the concrete framing. No foundation movement was observed. The slabs are concrete slab-on-grade, which appears to be in good condition.

2.2.1.3.2 Superstructure and Roof General Requirements

The roof framing consists of steel framing to support the metal deck roofing.

2.2.1.3.3 Structural Modifications and Repairs

No apparent repair needs were observed at this facility.

2.2.1.3.4 Seismic Design Requirements

This existing facility is in a high seismic area with a Seismic Design Category E designation. Based on seismic forces, lateral loads are resisted by the rigid concrete wall frames. All nonstructural components should require seismic bracing. A seismic evaluation in accordance with ASCE 41 should be performed for the entire building during the design/evaluation phase.

2.2.1.3.5 Structural Antiterrorism Requirements

Protective measures as specified by the current DoD Minimum Antiterrorism Standards for Buildings (UFC 4-

010-01) are not required for this facility since the building is not occupied.

2.2.1.3.6 Special Structural Requirements

Per UFC 1-200-01, Chapter 4, Kadena AB has an ESC of C5. The corrosive environment in Okinawa, Japan, must be considered to protect the rebar and any miscellaneous steel elements from rusting.

2.2.2 Architectural

The project and Department of Defense (DD) Form 1391 scope consists of renovating and sustaining existing facilities; therefore, the existing architectural style, massing, and fenestration/window openings should be maintained.

2-7

The facility renovation should be designed to be noncombustible, have a 50-year useful life, and be low maintenance with durable material choices. The climate is hot and humid; therefore, the facilities should be resistant to tropical conditions, including high winds, high humidity, high temperatures, corrosive salt-laden air, and earthquakes.

Materials should be selected for ease and speed of construction and should resist fire, winds, and seismic conditions.

Dead-level roofs and rooftop-mounted equipment are not allowed. The minimum roof slope for low-slope roofs should comply with UFC 3-110-03. The existing B2261 roof does appear to comply with minimum slope requirements based on the as-builts and onsite visual observation.

A satisfactory building envelope requires strength, durability, and weather resistance. The vapor retarder, insulation, and vapor dissipation systems should be properly balanced. Since this project is a renovation, the air barrier should follow the best practice guidance in Appendix A of UFC 3-101-01 for modifying an existing building to any area that is disturbed or repaired for the building envelope.

Any field-applied paints should be flexible enough to expand and contract with the substrate. The need for paint should be avoided by using materials that are in their natural color, are prefinished, or are integrally colored. The exterior color scheme should comply with the Kadena Air Base Design Guide and match the existing facilities color scheme, which also should be used to guide the design of each renovation.

The Preferred COA concept plans, the proposed demolition plans, and the proposed roof plan are included in

Appendix D.

2.2.2.1 Exterior Enclosure and Roofing

The following architectural elements represent the recommended approach for the renovated materials/systems and the quality of each exterior building component.

2.2.2.1.1 Exterior Walls

The existing walls are cast-in-place concrete with a spray acrylic coating and are in good condition. In general, no new work is anticipated for the exterior walls except where new penetrations or attachments are required. This includes new overflow drains, a roof access ladder, and any required mechanical penetrations. New penetration should be patched, repaired, and painted with a silicon-based elastomeric coating with antimicrobial properties and painted to match the adjacent surface.

2.2.2.1.2 Roof Assembly

The roof structure is cast-in-place concrete with a spray-applied roofing membrane. The roofing membrane is in good condition and no additional work is recommended. If any roof penetrations should be required during the design and construction, the roofing should be patched and repaired with a single-component, elastomeric, air-dry silicone coating with antimicrobial properties directly applied to the roof deck with a solar reflective top coating. Any flashings and copings should be prefabricated and factory finished. The existing roof does not appear to have insulation per the as-built drawings. The insulation is shown at the interior ACT level; therefore, it is recommended to install a spray-applied roofing insulation to the underside of the roof structure at approximately an RSI 6.7 (R-38) to provide a thermal envelope to meet the energy-saving requirements of

American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Standard 90.1.

2.2.2.1.3 Roof Drainage

The existing roof drains appear to be located and sized adequately, but the roof drain strainers are in corroded condition and are preventing the roof drainage from occurring efficiently. Some locations have backed up during heavy rains and caused leaks or overflow. To correct this problem, two actions are recommended. Firstly, each

2-8 roof drain strainer should be replaced. Secondly, there are no overflow drains on the existing roof; an overflow scupper is recommended to be incorporated by drilling 3-inch (75 mm) diameter holes into the concrete parapet wall just above the roof drains. This will allow overflow water to spill over the side in case of a clogged drain and also will alert personnel that there is a problem on the roof that needs maintenance.

2.2.2.1.4 Doors

No work is anticipated. Any unforeseen replacement of personnel doors and frames should be aluminum and have an anodized finish. Doors should be insulated and weather stripped with integral thermal break.

2.2.2.1.5 Keying Hardware

No changes are anticipated, but any keying updates/changes should be coordinated with 18 CES.

2.2.2.1.6 Windows

The existing windows are aluminum frame with a single-pane glazing component and will remain in place based on the limited scope of this project. One benefit to the existing building configuration is that the windows are shaded by an extensive concrete block shade structure on most of the inhabited spaces, resulting in little direct sun exposure. If any windows are damaged during construction, the window frames should be aluminum with impact-resistant, insulated, low-E, laminated glass with reflective tint. Glazing thickness should be designed to meet typhoon resistance requirements.

2.2.2.1.7 Louvers

No work is anticipated. Any louver required to be added during the design should be stainless steel or aluminum material and should be typhoon and insect resistant. Louvers should provide supporting performance data in accordance with the Air Movement and Control Association (AMCA) Standards 500 and 511, and louvers should bear AMCA certified rating seals for air performance and water penetration.

2.2.2.1.8 Metals

A roof access ladder is recommended to gain access to the one-story roof above the library (1996 addition area).

All exterior metal elements should be aluminum or stainless steel grade 316L for superior corrosion resistance, with special attention to providing a means of separation for any dissimilar metals to avoid galvanic action and premature corrosion.

2.2.2.1.9 Exterior Scope Summary

The following subsections present the recommended exterior scope summary for each facility.

2.2.2.1.9.1 Stearley Heights Elementary School, B2261

The exterior architectural elements are in good condition and work will be required only where the exterior components are adjacent or connected to the following scope items:

▪ Replace the existing roof drain strainers

▪ Incorporate scuppers (3-inch/75 mm diameter holes) in the parapet at each roof drain and patch/paint with elastomeric coating

▪ Install a roof access ladder to the one-story trapezoid roof structure (south central side of building); clean, patch, repair, and repaint concrete walls with elastomeric coating at any new penetrations required

2-9

2.2.2.1.9.2 Stearley Heights Gymnasium/Cafeteria, B2279

There are no current renovations anticipated for the gymnasium/cafeteria. It will continue to house the gymnasium activities and ground-level or low-shelving storage will continue in the cafeteria area.

2.2.2.1.9.3 Utility Building, B2285

The exterior architecture scope for the utility building will be limited to patch, paint, and repair where any new penetrations are required for the new HVAC system.

2.2.2.2 Interior Construction, Stairs, and Finishes

The primary interior scope items for the architectural components are as follows:

▪ Replace the ceilings based on the new fire sprinkler system required to be installed

▪ Add roof insulation to the underside of the roof structure

▪ Reconfigure the northwest administration quadrant

▪ Paint/patch/repair any finishes for the demolition/replacement of any scope recommendations required for all disciplines

The existing northwest quadrant configuration is not an efficient layout and contains multiple smaller rooms, three toilet compartments, and three millwork/kitchenette areas. One request from 718 CES is to provide some private offices for flexibility for tenant configurations. The proposed recommendation provides five private offices along with an open workstation area with 24 workstations. This provides more density and flexibility with the adjacent private offices. Additionally, the reconfiguration allows for a break area, consolidated men’s and women’s toilets, and a lactation room that is not currently present at the facility and is required for DoD facilities.

The office area and lactation room finishes should be vinyl composition tile flooring, painted gypsum board walls, and a suspended acoustical tile ceiling. The toilet rooms should have ceramic tile flooring and wainscotting with moisture-resistant painted gypsum board above. The ceiling should be painted moisture-resistant gypsum board.

The existing classrooms are well suited to be converted into administration space and each can hold approximately 12 workstations. The existing built-in cabinets and sinks in each classroom will be left as is to be used as storage for each administration suite. However, there are wall-hung lavatories outside of each toilet compartment in the classrooms that will be removed to create an efficient, open space for the incoming furniture and administration workstations. The existing single kid-sized toilets also will be removed and capped to allow those rooms to be used as storage.

The secure café rooms are purposefully stacked on the first and second floors in case there is a need to provide separation from other suites. There is currently an ongoing project to convert the second-floor room designated in the concept plan to a secure café. Additionally, the first-floor secure café is designated at that location, but there are no security requirements required at this time. For this effort, black-out curtains for those two rooms will be included, but no additional effort will be made for the walls/windows/doors, which will have to be addressed and analyzed by the System Safety Manager for the facility to confirm if any additional secure café requirements are required for the future tenants.

Additional recommendations include:

▪ Remove the Host Nation tatami mat room on the first floor to provide additional open area to configure new office layouts efficiently

▪ Remove the stove in the kitchen on the first floor to remove potential code violation issues

2-10

▪ Add a communications room on the second floor since very little room is available for the communications infrastructure

▪ Paint the interior to provide a fresh and updated appearance with a cost-effective solution

The flooring throughout the facility is typically vinyl composition tile and is in adequate shape.

2.2.2.2.1 Interior Scope Summary

The following subsections present the recommended interior scope summary for each facility.

2.2.2.2.1.1 Stearley Heights Elementary School, B2261

▪ Install a new suspended acoustical tile ceiling throughout

▪ Paint, patch, and repair finishes as needed for damaged areas or where fixtures/walls have been demolished

▪ Remove the stove from the first-floor kitchen

▪ Incorporate a lactation room

▪ Remove the traditional tatami mat room and repair finishes for administration space

▪ Revise the northwest quadrant of school administrative space to create an open and private office suite. Add a men’s and women’s toilet, break room, and lactation room, and a small electrical room to replace rooms that are to be demolished

▪ Add spray-applied insulation to the underside of the roof structure

▪ Remove wall-hung lavatories in classrooms

▪ Add a communications room to the second floor

▪ Paint interior walls

▪ Add black-out curtains to the secure café rooms

2.2.2.2.1.2 Stearley Heights Gymnasium/Cafeteria, B2279

There are no current renovations anticipated for the gymnasium/cafeteria.