Attach2-Vol_1_BOD_1a.pdf

CH2M HILL - HDR JV

Basis of Design – Part I

Design Intent

REPAIR MX HANGAR

MANSFIELD LAHM ANG BASE, MANSFIELD, OHIO

PBXP132166

Prepared By:

179th Civil Engineering Squadron 1947 Harrington Memorial Road

Mansfield, Ohio 44903

February 2019

SIGNATURES

Base Commander Base Civil Engineer

Using Organization Representative Environmental Manager

Fire Chief Security Chief

Safety Officer Communications Chief

Tab A – Project Requirements

M E M O R A N D U M

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Tab A – Project Requirements Repair MX Hangar, Ohio Air National Guard PREPARED FOR: Mansfield Lahm Air National Guard Base

PREPARED BY: Dennis Pearson, SE / CH2M HILL – HDR JV

DATE: February 2019

REVISION NO: Type B‐3 Final Design Submittal

PROJECT NUMBER: 669816 (CH2M HILL – HDR JV), PBXP132166 (ANG)

APPROVED BY: Chris Manz, PE / CH2M HILL – HDR JV

Project Location

Base Name: Mansfield Lahm Air National Guard Base

Location: 1947 Harrington Memorial Road Mansfield, Ohio 44903‐0179

Project Requirements

1. ANG Project Number & Title: PBXP132166 ‐ Repair MX Hangar

2. Scope: This project is for the repair and renovation of the existing maintenance hangar to accommodate and optimize space utilization in order to include shops for AMXS and MXS. The work is to include the repair and replace the HVAC system, the removal and replace carpeting with hard finish, repair exterior siding and doors, repair and/or replace the trench drain and associated system, upgrade fire alarm and suppression system, and update electrical systems to meet current codes and the Unified Facility Criteria.

3.Maximum Construction Cost (MCC):

4. Definitive/Facility Design Guides: ANG ETL 15‐01 Air National Guard Design Policy UFC 1‐200‐01 General Building Requirements UFC 4‐211‐01 Aircraft Maintenance Hangars

5. Floor Plan: The following existing drawings are provided:

• Original Drawings – 1949

• Lean‐To Additions – 1964

• CMU/Window Alterations ‐ 1975

• Renovation Drawing ‐ 1997

• Roof Renovation Drawings – 2015

• Hangar Door Retrofit ‐ 2015

6. Number of Occupants: UTA: 165, Full Time: 60

TAB A – PROJECT REQUIREMENTS

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7. Hours of Operations: 24‐hour operations

8. Individual Space Criteria: Space criteria sheets are attached

9. Sustainability Goal: LEED Certifiable

10. Facility Description: Building 102 – Aircraft Maintenance Hangar. The building was designed in 1948 and constructed in 1950. Construction documentation for the facility is limited. The as‐built drawing, Drawing Number 39‐01‐07 – Foundation & First Floor Plan (electronic file name: MMA 3‐18) indicated footings were designed for a soil pressure of 4,000 psf. Files MMA 3‐18, MMA 3‐19, MMA 3‐36 through MMA 3‐41 may be provided by the Base Civil Engineer (BCE) to the A‐E for references. The facility provides space for general maintenance activities for the C‐130 aircraft. The activities supported by the facility include:

• Training and Testing

• Electronic Counter Measures

• ISO Phase Inspection

• Avionics

• Aircraft Maintenance (Crew Chiefs)

• Maintenance Operations Control

• Quality Assurance

• Other Administrative Functions

MANSFIELD AFB INSTALLATION STANDARDS

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CH2M HILL - HDR JV

FACILITY STANDARDIZATION

Department of Defense (DoD) Instruction 4165.70 (Real Property Management) establishes the requirement for Installation Development Plans (IDP). As part of the IDP, installations are encouraged to coordinate development, remove clutter, enforcing consistent architectural themes, create appropriate pedestrian and vehicle circulation patterns, and focus attention to the installation’s appearance, which can enhance the quality of life and contribute to the overall mission.

It is Civil Engineering’s mission to construct, maintain, and sustain the installation infrastructure through standardization. Standardization represents the best course of action to implement best practices in sustainable planning, design and construction of sites and facilities. In doing so, enabling leadership to be good stewards of fiscal, human, and natural resources provided by the public, our Airmen, and the environment, in accordance with (IAW) all applicable Presidential Executive Orders (EO), Congressional Mandates, Unified Facility Criteria (UFC), DoD Instructions (DoDI), Air Force Instruction (AFI), Engineering Technical Letters (ETLs), et sequitur.

EXTERIOR ARCHITECTURE AND LANDSCAPE PLANNING

INTRODUCTION

The purpose of this section is to identify and evaluate the exterior architecture and landscape of the installation. The exterior environment creates the first impression of the installation for the community.

It should enhance the public image of the installation as well as provide a pleasant working/pedestrian environment for its personnel.

BUILDING EXTERIORS

The building exteriors on the installation are generally consistent. New construction and renovation of existing facilities shall have standard exterior finishes to provide consistent and cohesive appearance.

Brick Façade Facilities shall have the lower exterior with a brick façade matching Belden Brick Product Number 8632.

Administrative facilities shall have architectural emphasis by using Belden Brick Product Number 8621 to visually delineate building function. (Specification 09 06 90)

Figure 1: Belden Brick, Product Number 8621 Figure 2: Belden Brick, Product Number 8632

Metal Wall Panels, Hardware, and Associated Trim Facilities shall have the exterior trim comprised of metal wall panels. The panels shall be shall be G‐90 galvanized steel base material, with isocyanurate foam core. Exterior liner for the metal wall panels shall be embossed and striated. Interior liner shall be embossed and planked. (Specification 13 34 19)

The exterior color shall match the color from Sherwin‐Williams® Ohio Air Brown. (Specification 09 06 90) The formulation for the color is as follows:

Table 1: Ohio Air Brown Color Mix

BAC COLORANT 02 32 64 128

W1‐White ‐ 19 ‐ 1 B1‐Black 2 35 1 1 N1‐Raw Umber ‐ 32 ‐ 1 R2‐Maroon ‐ 13 ‐ ‐ Y3‐Deep Gold 2 32 ‐ ‐

Figure 3: Centria® Versawall® Wall Panel, Ohio Air Brown

Exterior Signage Signage to meet Unified Facilities Criteria (UFC) 3‐120‐01, Signs. Details to be generated.

(Specification 10 14 00.10)

LANDSCAPING

Landscape and hardscape of the installation adds the appearance and quality of life to the installation and its personnel. As highlighted in Air National Guard Engineering Technical Letter (ANGETL) 15‐01‐01, Sustainable Design, Development, and Resource Conservation and the overall design goals for ANG installations. The standardization of vegetation, pedestrian traffic, and circulation provides the visual and physical direction through the installation. Antiterrorism and Force Protection (ATFP) shall be

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considered as part of planning, as well as applicable codes, rules, and regulations for the environment and natural resource conservation. A cohesive list of standard vegetation shall be created as part of the standardization initiative to include the maintenance there of. (Specification 32 05 33)

As required by State guidance, the establishment of new vegetation shall be species native to Ohio.

EXTERIOR DOORS AND WINDOWS

Exterior trim shall be Ohio Air National Guard (OHANG) Brown. Color mix for OHANG Brown is provided in Table 1. All exterior openings shall meet the requirements of applicable laws, criteria, Executive Orders (EO), and instructions to include, but not limited to AFI 10‐245, Antiterrorism and Force

Protection; AFI 31‐101, Integrated Defense, and; UFC 4‐010‐01, Minimum Antiterrorism Standards.

FACILITY INTERIOR

Building interiors provide functional delineation between industrial and administrative space and occupancy. Requirements are driven by Occupational Health and Safety Administration (OSHA) and Local, State, and Departmental requirements. Standardization of facility appearance and systems provide a common palette and systems throughout the installation, thereby reducing the sustainability and maintenance cost.

Interior Paint There are two standard colors for interior walls. Accent walls or alternative colors are on a case by case basis, as approved by the Base Civil Engineer (BCE). (Specification 09 06 90)

Table 2: Ohio Air Dark Blue

CCE COLORANT 0Z 32 64 128

W1‐White 6 16 ‐ ‐ B1‐Black ‐ 5 ‐ ‐ L1‐Blue ‐ 49 ‐ ‐ R2‐Maroon ‐ 46 ‐ ‐ Y1‐Yellow ‐ 12 ‐ ‐

Table 3: Ohio Air Coconut Cream

BAC COLORANT 0Z 32 64 128

W1‐White ‐ 32 ‐ 1 R4‐New Red ‐ ‐ ‐ 1 Y3‐Deep Gold ‐ ‐ 1 ‐ Y1‐Yellow ‐ ‐ ‐ 1

Countertops Countertops and backsplashes shall be solid surfaced of solid polymer or stainless steel construction for non‐industrial and industrial spaces, respectively. The use of plastic laminate is discouraged due to maintenance purposes, with the exception of customer service counters. Color shall be selected by the command and/or management of the local area, subject to approval by the BCE. Specific requirements shall meet the Unified Facilities Guide Specification (UFGS) Section 12 36 00.

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ELECTRONIC SAFETY AND SECURITY

Intrusion Detection Systems (IDS) Intrusion detection systems shall be coordinated in conjunction with the 179TH Security Forces Squadron. (Specification 28 16 00.00 20)

Fire Suppression Systems In general, Fire Suppression Systems are dictated by UFC, local and National Fire Codes, and the National Fire Protection Agency (NFPA) standards. New systems shall be reviewed by a Professional Fire Protection Engineer licensed and registered by the State of Ohio (FPE). Systems shall be certified by the FPE that the design is in compliance with the applicable UFC, with concurrence of the ANG Civil Engineer Technical Service Center (CETSC) and Air Force Civil Engineer Center (AFCEC). (Division 21)

Fire Alarm Reporting Systems Annunciator and mass notification systems shall be compatible with the existing system on the installation and capable of expansion/upgrade. The existing systems on the installation are manufactured by Simplex‐Grinnell® and Monaco Systems®. Systems shall be DIACAP compliant, as required by DoDI. The Architect‐Engineer (A‐E) and General Contractor (GC) shall coordinate with the Installation Fire Department (179CES/CEF) Chief and 179TH Communications Flight (179CF) for specific requirements. (Specifications 28 31 00.00 10 & 28 31 02.00 20)

Heating, Ventilation, and Air Conditioning (HVAC) Building renovations and systems repair (by replacement) shall provide HVAC equipment to meet the installation standards. HVAC systems having one manufacturer allows for the maintenance staff to eliminate the need to have a large stock of parts and filters for streamlining preventative maintenance (under the Recurring Work Order Program (RWP)), and the training and operating costs of the equipment. (Division 23)

Air Handlers, Chillers, Cooling & Heat Pumps The large majority of the buildings on the installation use HVAC equipment manufactured by Daikin McQuay® therefore, this shall be the Basis of Design (BOD) for all renovations and replacement.

Installations of split unit systems are strongly discouraged and are approved on a case‐by‐case basis.

Boiler Systems The Basis of Design for boiler systems shall be Lochinvar® brand or equal. Parts required for RWP for the boiler systems shall be standardized, reducing the overhead costs of training, operations, and maintenance. All boiler systems shall meet all applicable Local, State, Federal codes, and UFCs.

Utility Monitoring and Control/Direct Digital Control System (UMCS/DDC) New projects and renovations shall include an integrated UMCS/DDC system. The system shall be compatible with the existing control system installed and operated by Civil Engineering. The existing system is the SmartStuxureTM by Schneider Electric® therefore, this system shall be the Basis of Design.

Coordination with the 179TH Communications Flight and Civil Engineering shall be required.

Tab B – Project Site Requirements

M E M O R A N D U M

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Tab B – Project Site Requirements Repair MX Hangar, Ohio Air National Guard

PREPARED FOR: Mansfield-Lahm Air National Guard Base

PREPARED BY: Dennis Pearson, SE / CH2M HILL – HDR JV

DATE: February 2019

PROJECT NUMBER: 669816 (CH2M), PBXP132166 (ANG)

REVISION NO: Type B-3 Final Design Submittal

APPROVED BY: Chris Manz, PE / CH2M HILL – HDR JV

Project Location

Base Name: Mansfield Lahm Air National Guard Base

Location: 1947 Harrington Memorial Road Mansfield, Ohio 44903-8049

Project Site Requirements

1. ANG Project Number & Title: PBXP132166 - Repair MX Hangar.

2. Site Description: Access to the installation is by way of Harrington Memorial Road. The South entrance is not to be utilized by contractor personnel. Two facilities are part of the Scope of Work for this project. Building 102 is one of the two hangars located on the installation. Building 102 is located on the northeast of the aircraft parking apron.

The hangar and its associated additions were completed in 1950. Facility drawings are available in pdf and dwg format. The following information is incorporated into this document or a disposition is provided:

1. Base Standards – Included as attachment.

2. Existing Utilities – Utility map for the installation is provided and attached. Building Specific utilities are available based off of historical documents:

a. Natural Gas

b. Electrical

c. Water

d. Sanitary Sewer

e. Storm Water

3. Existing Topographic Survey – A combined survey is completed for Hangar Building 102 and a planned Fire Station east of the hangar.

4. Existing Soil Borings – A combined geotechnical investigation is completed for Hangar Building 102 and a planned Fire Station east of the hangar.

TAB B - PROJECT SITE REQUIREMENTS

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5. Surrounding Infrastructure – An installation map is attached.

a. Parking:

i. Privately Operated Vehicle Parking – North East of facility.

ii. Government Operated Vehicle Parking – South East of facility.

b. Vehicular Traffic – Main delivery thoroughfare parallel to southeast wall of building.

Traffic typically includes supply deliveries and passenger vehicles.

c. Suspected Environmental Restrictions – A hazardous materials survey is complete for Hangar Building 102. The survey is provided in Appendix C.

d. Special Siting Criteria – A new Fire Station is currently planned in the parking lot area east of the Hangar.

e. Existing Master Plan – Master Airfield Base Layout Provided.

PHOTOGRAPHIC LOG

Project Name:

Hazardous Materials Survey

Location:

Repair Mx Hangar, Mansfield-Lahm ANG Base, Ohio

Project No.

W-16-023

Photo No.

Date:

3-1-16

Description:

View of the interior of the hangar.

Hazardous Materials Survey

Location:

Repair Mx Hangar, Mansfield-Lahm ANG Base, Ohio

Project No.

W-16-023

Photo No.

Black mastic was present under the epoxy flooring.

Hazardous Materials Survey

Location:

Repair Mx Hangar, Mansfield-Lahm ANG Base, Ohio

Project No.

W-16-023

Photo No.

Black mastic was present under carpet.

Hazardous Materials Survey

Location:

Repair Mx Hangar, Mansfield-Lahm ANG Base, Ohio

Project No.

W-16-023

Photo No.

The southern-most concrete column in Rm 112 contained lead paint.

Hazardous Materials Survey

Location:

Repair Mx Hangar, Mansfield-Lahm ANG Base, Ohio

Project No.

W-16-023

Photo No.

Transformers within the structure were dry-type and did not contain oil.

Tab C ‐ ANG Design Objectives and Procedures

16 APRIL 2010

AIR NATIONAL GUARD

DESIGN OBJECTIVES AND PROCEDURES

(TAB C)

Tab D ‐ ANG Design Policy

1 Attachment 1 ANGETL 15-01-00, 1 May 15

AIR NATIONAL GUARD

DESIGN POLICY

INDEX

SECTION 1 DESIGN CODES, STANDARDS AND REFERENCES

SECTION 2 GENERAL DESIGN GOALS AND GUIDANCE

SECTION 3 BUILDING SYSTEMS LIFE CYCLE COST DESIGN

SECTION 4 ARCHITECTURAL STANDARDS

SECTION 6 LANDSCAPING

SECTION 7 AIRFIELD AND VEHICLE PAVEMENT DESIGN

SECTION 8 MECHANICAL ENGINEERING

SECTION 9 SUSTAINABILITY DESIGN, DEVELOPMENT AND RESOURCE CONSERVATION

SECTION 10 SENSITIVE COMPARTMENTED INFORMATION FACILITIES (SCIF) and

ANTITERRORISM/FORCE PROTECTION (AT/FP) GUIDANCE

SECTION 11 UNDERGROUND AND ABOVEGROUND STORAGE TANKS

SECTION 12 FIRE PROTECTION DESIGN GUIDANCE

SECTION 13 ELECTRICAL AND COMMUNICATION ENGINEERING

SECTION 14 OCCUPATIONAL SAFETY AND HEALTH

SECTION 15 ENVIRONMENTAL REQUIRMENTS AND REFERENCES

SECTION 16 DEMOLITION AND REMODELING

Tab E ‐ Project Approval Package

Basis of Design – Part II

Design Narratives

T E C H N I C A L M E M O R A N D U M

CH2M HILL ‐ HDR JV 1

Architectural Design Narrative Repair MX Hangar, Mansfield Lahm ANG Base, Ohio PREPARED FOR: Mansfield‐Lahm Air National Guard Base

PREPARED BY: John Baudry / CH2M HILL – HDR JV

DATE: February 2019

PROJECT NUMBER: 669816 (CH2M HILL – HDR JV), PBXP132166 (ANG)

REVISION NO.: Type B‐3 Final Design

APPROVED BY: Dennis Pearson, SE / CH2M HILL – HDR JV

Introduction This design narrative summarizes the architectural approach to the Repair MX Hangar, a project to upgrade the existing Maintenance Hangar, Building 102, located at the Mansfield LAHM ANG Base, Mansfield, Ohio. The personnel who will occupy this new facility are members of the 179th Aircraft Maintenance Squadron working in support of the units C‐130H2 Hercules aircraft.

The existing maintenance hangar was constructed in 1950 and renovated in 1997. Facility infrastructure systems are at the end of their useful life and do not meet code, ETL or UFC criteria. The guard has commissioned a current design/construction project that will replace the existing rolling door with a vertical lift fabric door.

Office, shop and support space configurations have been negatively impacted by mission and functional changes and have caused a degradation of spatial organization. In the future non‐maintenances functional groups that are currently located within the hangar will be relocated to other facilities.

Maintenance focused functional groups such as Sheet Metal, Tech Metals, Welding and Electrical & Environmental are currently located in other base facilities and this project will maximize co‐location into the Maintenance Hangar.

Multiple design plan Alternatives have been produced and distributed for review and discussion with the Ohio Air National Guard. From those concepts Alternate 4 has been selected as the floor plan for Type A2 Concept Development.

Design Approach and Concept The design intent for the project is to provide a highly functional, economical, user friendly, aesthetically pleasing facility that is durable, easy to maintain and supports maintenance personnel and functions while also bringing the hangar up to modern and current standards.

Functional Groups

The following functional maintenance groups are currently located in the Maintenance Hangar and will be relocated to make room.

Avionics Shop

Guidance and Control

Communications

ARCHITECTURAL DESIGN NARRATIVE

Navigation

Electronic Counter Measures

Isochronal Dock Shop

The following functional maintenance groups have been proposed to be located in the Maintenance Hangar.

Electrical & Environmental Shop

Hydro Shop

Wheel & Tire Shop

Structural Sheet Metal Shop

Stencil Shop

ISO/Dock Shop

Dock CKT

Code Analysis The International Building Code, NFPA and applicable UFC’s will be utilized to assure the repaired facility complies with current fire, life‐safety codes. The initial code search synopsis is located in Appendix A.

Exterior and Interior Materials and Finishes

Exterior Building Design and Systems

Currently the original brick is failing with broken and spalled brick and failing mortar joints. The veneer does not match the color/texture of new base facilities. Metal wall panels are discolored, HVAC ductwork has been abandoned in place altogether presenting a very negative public image as it is one of the first buildings seen upon entering the base. New brick veneer and insulated metal wall panels will meet base standards. Exterior doors and windows will be replaced with insulated units meeting base standard.

Exterior overhead coiling doors and swing doors in shop and support spaces will be factory primed, field painted steel in steel frames. Overhead doors will be insulated roll ups. Concrete filled pipe bollards will be provided at exterior equipment and roll‐up doors to protect equipment and building corners.

The roof membrane has recently been replaced, is a white single ply membrane, and only limited work is expected to take place to accommodate limited new roof penetrations and to repair areas impacted by demolition.

Daylighting for interior spaces will be provided to the maximum extent possible.

The exterior building envelope systems including wall assemblies, glazing and door systems will be in compliance with Air National Guard Design Policies and base standards.

Replacement of exterior finish materials will work to provide a cohesive public and private visual connection to existing buildings on base.

Interior Building Design and Systems

Only limited and minor repair work will be executed within the hangar bay.

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Non‐piped trench drains will be provided at doors leading to adjacent industrial/office areas to preclude entry of liquids into those spaces. Planes to be serviced are drained of hazardous and combustible fluid before being brought into the hangar, minimizing the event of a spill. Minor spills are expected to be contained within the drains to be manually drained should such an event occur.

The facility will meet the Architectural Barriers Act (ABA) standards as required by UFC. Compliance with the ABA will be provision of an elevator capable of accommodating an ambulance stretcher.

Construction of interior partitions and walls will comply with Air National Guard Design Policy. Per NGB mandate, office spaces will be open (workstations with partitions) wherever possible. Partition height will be extended to deck above.

Limited supervisory office, break and training spaces will be located on a second floor. Work carrels will be provided to accommodate computer based training activities.

Demising walls, floors, roofs between the hangar bay and adjacent industrial/office space will be fire rated per applicable standards.

Interior demising walls in shops will be constructed of painted CMU. Office areas will be built out of steel studs with gypsum wall board.

In accordance with UFC 4‐211‐01 spaces adjacent and communicating with the hangar bay will be “suitably cutoff” from the hangar by the use of two normally closed (self‐closing) doors i.e. air lock entry.

Exterior walls and wall separating the hangar and shop space will be insulated to achieve mandated R‐ values.

Ceramic tile walls and floors will be provided in toilet, shower, and locker rooms. Toilet and locker room walls will be tiled to a minimum of 6 feet‐0 inch above finished floor.

A sealed concrete finish will be provided for floors in shops, storage, mechanical, electrical, utility rooms etc. The hangar bay will have its epoxy coating touched‐up and repaired where damaged.

Interior doors will be insulated painted hollow metal. Relite frames will match adjacent door frames.

Suspended acoustical ceilings will be utilized in spaces requiring a ceiling. Moisture resistant gypsum board ceilings will be provided at all restroom and locker areas. Ceilings for shop, storage and utility rooms will be left exposed to structure with suspended lighting, visible ductwork and sprinklers lines.

Energy Criteria

The building envelope walls are designed to include insulated components to meet or exceed the Air National Guard Energy performance criteria. The roof is relatively new and will not be impacted by this design.

Sustainability Criteria

Although the project has not been required to receive a LEED® certification, the project is being designed to be LEED® Certifiable. See Sustainability Narrative and Checklist for additional details.

Anti‐terrorism and Force Protection Measures The proposed design will incorporate force protection and security measures in accordance with UFC 4‐010‐0, DoD Minimum Anti‐Terrorism Standards for Buildings. Refer also to the Structural Design

Narrative and ATFP documentation for further discussion on the AT/FP approach and the Civil Design Narrative for further discussion to the AT/FP site approach of the facility.

In conjunction with base personnel it has been determined that the hangar bay will be considered low occupancy while the adjacent shops will be considered inhabited.

Force protection features include glazing and window frames detailed to meet UFC standards, outward swinging exterior doors properly seated for blast mitigation, controlled roof access, and mechanical air intakes at least 10 feet above the ground.

Demolition Interior and exterior demolition is indicated as required by the final design. Interior walls, to be demolished, are not bearing walls and are not anticipated to impact structural integrity of the facility.

The existing mezzanine is to be demolished and replaced with complete second floor structure and finished spaces.

Asbestos floor mastic has been identified in the facility. Asbestos abatement has been addressed in the Hazard Material Survey Narrative in this document. Specification sections provide guidance.

Technical Architectural Design Criteria ANG ETL 15‐01, Air National Guard Design Policy

UFC 4‐211‐01, Aircraft Maintenance Hangars (95% Submittal)

UFC 1‐200‐01, Jul 2013, General Building Requirements.

UFC 4‐010‐01, Feb 2012, DoD Minimum Antiterrorism Standards for Buildings

2012 International Building Code (IBC)

NFPA101 Life Safety Code

NFPA Standard on Aircraft Hangars

CH2M HILL ‐ HDR JV 1

Civil Design Narrative Repair MX Hangar, Mansfield Lahm ANG Base, Ohio PREPARED FOR: Mansfield‐Lahm Air National Guard Base

PREPARED BY: Amanda Thompson / CH2M HILL – HDR JV

DATE: February 2019

PROJECT NUMBER: 669816 (CH2M HILL – HDR JV), PBXP132166 (ANG)

REVISION NO.: Type B‐3 Final Design

APPROVED BY: Dennis Pearson, SE / CH2M HILL – HDR JV

Introduction This design narrative summarizes the site conditions and presents the approach to the civil design of Building 102 Hangar Repair project at the Mansfield‐Lahm Air National Guard base in Mansfield, Ohio.

Site design elements for the project include:

Anti‐Terrorism

Site Circulation and Parking

Grading and Drainage

Utilities

Landscaping

Facility Location Building 102 is located immediately adjacent to the parking lot just inside the main entrance of the Mansfield‐Lahm Air National Guard Base on the northern side of Mansfield, Ohio. The project consists of renovating the interior spaces of the building, upgrading facility infrastructure (new oil water separator, sanitary and storm drain piping), adding an access driveway to the rollup door, adding fire water storage tanks and pump building, adjusting sidewalks to access the building from adjacent roads and parking spaces, adjusting stoops to exterior doors, parking spaces, adding equipment enclosures and access control.

The northwest side of the Building opens onto the parking apron via the hangar door. Along the northeastern side of the building is a POV parking lot approximately 70 feet from the building with a grassed (sod) area and sidewalks to the exterior doors. An access road runs parallel to the southeast side of the building approximately 40 feet from the building. The site generally slopes from the south to the north and the existing access road is approximately 5 feet higher than the finish floor elevation of the building. Between the building and the access road, the ground (sod) slopes down towards the building to a low spot approximately 10 feet from the building. There are existing buildings 103, 104, 104A, and 114 to the southwest of the building. Sidewalks and a grassed area exist along the southwest corner of the building. There is existing mechanical and electrical equipment located both at the southwest corner and along the northwest side of the building. Downspouts surround three sides of the building and tie into below grade storm drain lines.

CIVIL DESIGN NARRATIVE

Current drawing base mapping is based upon field run topographic survey and CAD files provided by the Mansfield‐Lahm ANG.

Design Criteria Driveway Widths = 12 feet minimum, one‐way

Curb and Gutter = match existing = 6‐inch vertical face with 12 inches wide gutter pan

Sidewalk = match existing = 5 feet minimum width; 4 inches thick

Grading = Pervious Surfaces, 2% min

= Roadways, Longitudinal grade, 0.5% min

= Roadways, Transverse grade, 2% min

= Sidewalks, Longitudinal grade, 5% max

= Sidewalks, Transverse grade, 2% max

= Stoops, 2% max

Anti‐Terrorism The renovation project is located within the fenced perimeter of the Mansfield‐Lahm ANG and Mansfield‐Lahm Regional Airport. The base perimeter is fenced completely along the south, west and east sides and has a main entrance on the east side (off Harrington Memorial Road) that has the capability of searching and detecting explosives. There is a secondary gate on Cairns Road near Building 600 that is located in the southwest corner of the base approximately 4,300 feet southwest of the main gate. The north side of the base borders the airport and most of the perimeter is either fenced or has buildings separating it from the air field. Since Security Forces personnel watch and patrol the apron, and security cameras are present, the gates along the apron can be considered having the ability to search for explosives. Therefore, the renovation project would be considered within a controlled perimeter as defined by UFC 4‐010‐01.

The site was therefore designed to meet anti‐terrorism (AT) standoff requirements for buildings within a controlled perimeter. The shops portion of the building classification will be classified Inhabited and the hangar bay will be classified low occupancy. An analysis of the occupancy and conventional wall construction type of the structure determined that the conventional construction standoff distance for weight II explosives (CCSD‐II) is 33 feet. Refer the “Structural Narrative” and AT documentation for more information.

The placement of fire protection, mechanical and electrical equipment must not provide the opportunity to conceal a 6‐inch diameter object. As a result, equipment located within the 33‐foot CCSD‐II that is directly adjacent to the building requires metal sheathing between the equipment and the building face. Due to the high visibility location of the existing transformers, fencing is not required.

In addition, the new transformer will be enclosed within a lockable cabinet type enclosure that matches the enclosure on the existing transformer. One of the fire tanks will be located within the 33‐foot CCSD‐ II. A fence will be installed surrounding the tanks and tie into the fire pump building. Due to the proximity of Buildings 103, 104 and 104A, a fence will be installed that ties into the hangar building and adjacent building 104A. A pedestrian gate will be provided with a cypher lock. This fence will control the access between the buildings. The driveway to the rollup door will require access control at the 33‐foot CCSD‐II line that will be accomplished by a locked drop‐down arm. In addition, striping “No Parking” will be placed at the 13‐foot standoff distance in front of the roll up doors (on the driveway access and along the flight line). All exterior furnishings that are currently surrounding the building including but not limited to picnic tables, grills, horse shoe pits and propane tanks will be removed and relocated to another site by the Government.

Site Circulation and Parking

Construction Access and Staging

Primary contractor access to the construction site will be through the Main gate located on Harrington Memorial Road. A secondary access route will be through the gate located off Cairns Road. Potential staging areas are located in a gravel area southwest of the site and adjacent to Building 207 as well as in the existing parking lot to the northeast of the building.

Site Circulation and Parking

The existing access road along the southeast side of the building will remain in service and provide vehicular access to the building. The existing parking lot to the northeast contains 13 spaces for the building. One new driveway off the parking lot will be constructed to provide access to a new rollup door. Per the Base, the driveway will be Portland cement concrete pavement with 6‐inch vertical curb and gutters. It will be stripped from the building to the 33 foot CCSD‐II and “NO PARKING” added to the pavement. Apron connections along the flightline will be provided to the rollup door for access to the shops. Existing pavement in the parking lot is assumed to be 3 inches thick and existing asphalt in flight line is assumed to be 8 inches. Existing concrete in flightline is 11 inches. Any patching required will match existing material thicknesses.

There are currently 229 parking spaces located in the existing parking lot northeast of Building 102. The closest row of 13 spaces along the northeast side of the building will contain 4 ADA spaces with sidewalks connecting the ADA spaces to the building door at the eastern corner of the building. The sidewalks will be revised to accommodate the new rollup door driveway. Curb cuts in the existing curb and gutter will be provided where new sidewalks tie into existing pavement. Curb ramps will be provided at pedestrian crossings across the new driveway. Two regular parking spaces will be removed for the addition of the driveway, however, the capacity of the remaining existing parking lot provides adequate parking for the surrounding buildings and their occupancies. Per ADA, a parking lot with 229 stalls needs to provide 7 ADA stalls and at least one of them needs to be van accessible or Universal.

An additional three ADA spaces are provided in the existing parking lot closer to Building 164.

The existing sidewalks along the southwestern and southeastern sides of the building will remain. The sidewalk along the southwestern side will be extended as needed to provide access to the new personnel doors. A new sidewalk will connect two segments of existing sidewalk to provide pedestrian access to the southwestern side of the building. Concrete stoops will be demolished where existing doors will be removed and concrete stoops added where new doors will be installed. Connections will be made from the new stoops to the adjacent sidewalks. Segments of existing sidewalk will be demolished as needed to accommodate circulation to the new door locations and the new driveways to the roll up doors.

Grading and Drainage Site grading will provide adequate drainage away from the structures. Existing drainage paths will be maintained and utilized for the finished drainage plan. If a low point in the grading is unavoidable, then a new catch basin and storm drain piping will be installed to prevent ponding. All drainage will eventually discharge either to the drainage channel to the south or to the storm drain main located in access drive to the southeast of the building.

The new driveway will be sloped away from the building to a low point with a cross slope. The gutter at the low point will have a curb cut and gutter that discharges to the infiltration basin. The northeastern edge of the driveway will tie into existing parking lot grade.

Per Section 438 of the Energy Independence and Security Act of 2007, a redevelopment project involving a Federal facility with a footprint that is greater than 5,000 square feet must maintain or restore predevelopment hydrology of the property. As a result, infiltration galleries have been designed to retain runoff from the added impervious surfaces (sidewalks and roll up door driveway). Using daily precipitation data from NOAA, for the Mansfield Airfield Base, a 95th percentile rainfall event of

1.29 inches was calculated, see appendix. To address the 2,703 additional square feet of impervious area on site, an infiltration basin was designed to contain 291 cubic feet of stormwater. A 252 square foot basin with 3‐feet of 3‐inch drain rock will be used to contain the stormwater runoff from the new driveway. See calculation below:

INFILTRATION BASIN

95th Percentile = 1.29 in Impervious Area = 2703 sf Required Volume of Basin = 2703 sf *(1.29 in /12 in/ft) = 291 cf Area of Basin = 9 ft x 28 ft = 252 sq ft Basin Depth = 3 ft Volume of Basin: 3 ft * 252 sf = 756 cf Assumed Void Ratio = 40% Proposed Volume of Basin = 750 cf * 0.4 = 302 cf

To address the existing soggy area along the south‐eastern side of the building a 2‐foot wide infiltration swale was designed with 1 1/2 feet of 3‐inch drain rock to hold the runoff from the new sidewalk installed along the southeastern side of the building. The existing drain inlets will be relocated to the centerline of the infiltration swale or low spot to improve drainage. See calculation below:

INFILTRATION TRENCH

95th Percentile = 1.29 in Impervious Area = 950 sf Required Volume of Swale = 950 sf *(1.29in /12 in/ft) = 102 cf Area of Swale = 2 ft x 160 ft = 320 sf Swale Depth = 1.5 ft Volume of Swale = 1.5 ft *320 sf = 480 cf Assumed Void Ratio = 40% Proposed Volume of Swale = 480 cf * 0.4 = 192 cf

Soil Erosion and Sediment Control

The design documents will include a soil erosion and sediment control plan along with erosion control details that will follow local requirements. Existing storm drain inlets surrounding the building will be protected during construction. Fiber rolls/straw wattles will be installed along the curb line to ensure excavation for the demolition and replacement of the OWS, does not contribute sediment laden runoff to the parking lot.

CH2M HILL ‐ HDR JV 5

Utilities All utilities needed to serve the new complex are available in the immediate vicinity of the building, except for fire suppression, see Fire Protection Narrative. Site utilities serving the renovation project include:

Sanitary Sewer

The existing floor and trench drains within the hangar bay are tied together and discharge under the center of the hangar door. The 4‐inch outlet pipe exits the building and ties into an existing sanitary manhole in the flight line apron. The 4‐inch pipeline (which may be 6 or 8 inches from the manhole) connects to another manhole in the apron then, turns southeast and connects to the AFFF diverter valve pit then the existing oil/water separator. The outlet from the oil/water separator is assumed to be 6 inches and discharges to the existing sanitary sewer manhole on the existing 8 inches main line located in the access road.

The existing pipe outside the hangar and the downstream manholes freeze. In addition, the AFFF diverter valve is stuck in a closed position which may contribute to the freezing. As a result, the pipe and manholes will be lowered. Even though the frost depth is anticipated to be 30 inches segments of the pipe located shallower than 3 feet will be insulated. This work requires surface restoration of the concrete apron, sidewalks and sod. The remainder of the outlet pipe from the oil/water separator to the existing sanitary sewer main will be replaced.

In addition, the existing AFFF diverter valve pit and oil water separator will be demolished. Per UFC 4‐211‐01, Chapter 3‐5.7, a new oil/water separator (OWS) sized according to the anticipated drainage flow, approximately 2,000 gallons, is required and will be installed. The OWS was sized based upon the function of the facility, the flow from the hoses used in the facility, estimated peak trench flow during normal use, and the size of the existing trench drain outlet pipe. The OWS will consist of double‐ wall containment and level monitoring, a UL‐listed tank, and solids interceptor for incidental grit and sand that may be present during limited rinse activities occurring in the hangar. New 4‐foot diameter manholes will be installed at direction changes and at the connection point into the existing sanitary sewer main. The majority of the sewer pipe will be pressured rated (150 psi) pipe conforming to AWWA standards due to its proximity to the existing water line. A 10‐foot horizontal or 18‐inch vertical separation was not possible due to the existing storm drain line and downspout connections, the proximity to the building and existing water line and lack of fall between the trench drain outlet and existing sanitary main line pipe.

The building’s existing 6‐inch sanitary sewer service exits the northwestern side of building at the existing locker room. It ties into the existing sanitary pipe line downstream of the oil/water separator via an existing manhole. This line will be abandoned and a new sanitary service will be provided from the relocated locker rooms along the southeastern side of the building. The service will be tied into the existing 6‐inch main pipeline parallel to the access road. Two new services will exit the southwestern side of the building and tie into the existing service near the southwestern corner of the building.

Cleanouts will be installed 5 feet outside the building and service connections at the main pipeline.

Water

The existing 8‐inch water service line for both potable and fire protection services is connected to an existing 8‐inch water line located south of the building just north of the access road. The line enters the building’s mechanical room in the southwest corner. This line will remain in service to supply domestic water to the facility. A new fire protection water line will be installed between the building and the fire

6 CH2M HILL ‐ HDR JV

pump building. An additional connection off the existing water line will be made to service the fire pump building and tanks. A post indicator valve will be located off this connection.

Fire Service

The new fire suppression system will require two above grade water tanks and a fire pump house. The building and tanks will be located near the 33‐foot CCSD‐II in the existing landscaped area to the south/southeast of the building. The building will be located parallel to the existing access road with the tanks located north of the building. A 10‐inch fire protection line will be installed from the fire equipment room inside the hangar to the fire pump building. The pipe will be placed parallel to the existing 8‐inch water line to the south of the building. The fire department connection will be placed just outside of the fire equipment room.

Refer to the “Fire Protection Narrative” for additional information on fire service.

Roof Drains and Storm Sewers

Roof drains surround the building and tie into below grade pipes that connect to the Base’s storm sewer system. Modifications to the building face and new door locations will require roof drain connections to the existing storm drain piping to be modified. The existing storm drain piping will be cut and a new pipe elbow installed to receive the outlet of the roof drain. Surfaces surrounding the roof drain pipe connection will be repaired to match existing surrounding surfaces.

There are several inlets and catch basins surrounding the building. These drains also tie into the existing storm sewer system. Drain inlets will be relocated and added based upon location of new sidewalks and the driveway to the roll up door. Drain inlets along the southwestern side of the building will be relocated to the low point between the building and the access drive.

Landscaping Most of the area around the building is grassed (sod). It is planned to restore areas surrounding the building disturbed by construction with sod. There is no existing irrigation system and no new irrigation will be provided. Existing trees will be protected where possible.

References The following documents were consulted in the preparation of this memorandum:

ANG ETL 01‐1‐1 Air National Guard Design Policy Final, Revised March 2004 (Tab D)

ANG ETL 98‐2 Compliance with Handicapped Accessibility Standards

United States Access Board, ABA Accessibility Standard for Department of Defense Facilities

United State Environmental Protection Agency, Technical Guidance on Implementing Stormwater Runoff Requirements for Federal Projects under Section 438 of the Energy Independence and Security Act (EISA)

UFC‐3‐201‐01 Civil Engineering

UFC‐3‐201‐02 Landscape Architecture

UFC‐3‐210‐10 Low Impact Development

UFC‐3‐220‐01 Geotechnical Engineering

CH2M HILL ‐ HDR JV 7

UFC‐3‐230‐01 Water Distribution

UFC‐3‐240‐01 Wastewater Collection

UFC‐3‐250‐01 Pavement Design for Roads & Parking Areas

UFC‐3‐250‐03 Standard Practice Manual for Flexible Pavements

UFC‐3‐250‐04 Standard Practice for Concrete Pavements

UFC‐4‐010‐01 DoD Minimum Antiterrorism Standards for Buildings

UFC‐4‐022‐03 Security Fences & Gates

UFC‐4‐211‐01 Aircraft Maintenance Hangars

CH2M HILL‐HDR JV 1

Structural Design Narrative Repair MX Hangar, Mansfield Lahm ANG Base, Ohio PREPARED FOR: Mansfield‐Lahm Air National Guard Base

PREPARED BY: Dennis Pearson, SE / CH2M HILL – HDR JV

DATE: February, 2019

PROJECT NUMBER: 669816 (CH2M HILL – HDR JV), PBXP132166 (ANG)

REVISION NO.: Type B‐3 Final Design

APPROVED BY: Dennis Pearson, SE / CH2M HILL – HDR JV

Introduction The Repair MX Hangar project is a retrofit of Building 102 at Mansfield Lahm Airfield in Mansfield, Ohio.

This narrative describes structural engineering criteria and the design intent for the project. The intended audience for this narrative includes stakeholders, project management, quality reviewers, and other members of the A/E design team.

Building 102 is a single bay aircraft maintenance hangar with ancillary spaces supporting shop and administrative functions. The building will be updated to accommodate the current mission of the 179th Wing. The hangar portion of the facility was originally constructed overseas before being shipped to the United States and re‐constructed in the 1950’s. The existing building structure includes long span arched trusses over the hangar bay that bear on concrete frames. The single story ancillary spaces around the hangar bay are constructed of concrete frames, elevated concrete slabs, and CMU infill walls. An exterior brick veneer covers the CMU infill walls and concrete frames. Foundations are shallow spread footings

Geotechnical Information Foundation design is based on existing drawings from 2015 and foundation recommendations authored by CH2M HILL – HDR JV. Shallow spread footings will be founded on 8‐inches minimum of compacted granular fill and are designed for 2500 psf allowable soil bearing in accordance with the geotechnical recommendations.

ASCE 7 requires site classification to characterize seismic ground motions at a building site. For this project, soil borings were drilled to a depth of 100 feet to determine the Site Classification. Based on these borings and soil test reports, the Geotechnical Engineer recommends a Site ‘D’ classification in accordance with ASCE 7, section 20.1.

Environmental Structural Loads Risk Category III is used in accordance with UFC 4‐211‐01, Section 3‐3. Risk Category is important for environmental load design as it defines the acceptable performance of the building in event of an extreme seismic, wind, or snow event. Risk Category III facilities are designed for the minimum seismic, wind, and snow forces permitted by the building code. Risk Category III structures are expected to incur significant damage in a design level event, possibly rendering the facility un‐inhabitable and subject to significant repair or replacement. The design intent for Risk Category III is to prevent structural collapse

STRUCTURAL DESIGN NARRATIVE

that results in loss of life and prevent failure of equipment required to evacuate the building and prevent release of toxic substances. Facilities that are required to remain operational after an extreme event are classified as Risk Category IV or V facilities; these facilities will typically have significantly higher design and construction costs.

UFC 3‐301‐01, Structural Engineering, provides environmental load conditions for several DoD installations throughout the world. Mansfield LAHM Airfield is not identified in this UFC so environmental load parameters will be based on ASCE 7 and the U.S. Geologic Survey (USGS).

Wind

The basic wind speed at the project site is 120 MPH based on ASCE 7 for Risk Category III structures. The facility is an Exposure C classification considering scattered wind obstructions on a relatively flat terrain.

There are no topographical features on this site that would cause wind speed up effects. Building 102 contains one story flat roofs over the ancillary spaces, and an arched roof approximately 85 feet tall over the hangar bay.

The hangar doors may be open during times of high wind. Therefore, wind loads inside the hangar bay will be the worst case of an enclosed structure with 120 MPH winds, or a partially enclosed structure with 85 MPH winds. This design approach is based on the 2009 edition of UFC 4‐211‐01, Aircraft Maintenance Hangars. Wind speeds presented in this UFC are based on Allowable Stress Design (ASD) and have been adjusted to reflect strength level design in accordance with currently adopted codes.

While this requirement is eliminated from the latest edition of UFC 4‐211‐01, CH2M HILL – HDR JV believe it a prudent design practice for hangars with large door openings.

Snow

The ground snow load specified for this site is 20 psf. Building spaces under the roof are heated. The low flat roofs over the ancillary spaces is subject to drift loading caused by wind and snow shedding off the higher hangar roof as well as rain on snow surcharge conditions.

Seismicity

According to the U.S. Geologic Survey, seismicity is very low in this region of the country. Based on expected ground accelerations, the project is classified as a Seismic Design Category (SDC) B.

Accordingly, seismic bracing for architectural and MEP components is not required by ASCE 7, though it may be required by other MEP codes and standards. Specific ground motion criteria are identified below.

Site Classification: D According to Site Specific Geotechnical Recommendations

Design 5% Damped Spec. Acceleration (Sds): 0.127 g Per USGS Criteria (Attached)

Design 5% Damped Spec. Acceleration (Sd1): 0.090 g Per USGS Criteria (Attached)

Importance Factor (Ie): 1.25 Per UFC 4‐211‐01, Section 3‐3 and ASCE 7, Table 1.5‐1

Seismic Design Category: B Per ASCE 7, Table 11.6‐1 and 11.6‐2

Seismic Lateral Resisting System

Existing: Ordinary Reinforced Concrete Moment Frames, and Steel Systems Not…