Attachment_Design Narrative 5-28-21 (20 Pages).pdf

VA NEBRASKA-WESTERN IOWA HEALTH CARE SYSTEM – CONSTRUCT AIR HANDLING TOWER

PROJECT NO. 636-18-303 PAGE 1

100 % CONSTRUCTION DOCUMENTS

May 28, 2021

CLIENT / OWNER

Department of Veterans Affairs

VA Nebraska-Western Iowa Health Care System

4101 Woolworth Avenue

Omaha, NE 68105

US Department of Veterans Affairs

Nebraska-Western Iowa Health Care System - 4101 Woolworth Avenue MS 138, Omaha, NE 68105

PROJECT TEAM

PROJECT TEAM LEAD:

ANDERSON ENGINEERING OF MINNESOTA, LLC

13605 1st Avenue North, Suite 100

Plymouth, MN 55441

(763) 412-4000

ARCHITECTURE / CIVIL ENGINEERING:

ANDERSON ENGINEERING OF MINNESOTA, LLC

13605 1st Avenue North, Suite 100

Plymouth, MN 55441

(763) 412-4000

STRUCTURAL/MECHANICAL / ELECTRICAL ENGINEERING:

IMEG

2882 106TH Street

Des Moines, IA 50322

(630) 717-2433

Table of Contents

1.0 CIVIL NARRATIVE

2.0 ARCHITECTURAL NARRATIVE

PROJECT NO. 636-18-303 PAGE 2

1.0 CIVIL NARRATIVE

OVERVIEW

The project consists of demolition, abandonment and relocation of various wet utilities that service existing buildings and the new Air Handling Tower. Utilities range from 1” water lines to 16” Condensing

Water lines to and from the chilling tower. Existing parking lot near Building 17 will be removed for the new building.

UTILITY AND CONSTRUCTION CONSIDERATONS

Care will need to be exercised in the relocation and new installation work to insure uninterrupted sanitary, storm and water service. Contractor will need to verify on site utilities prior to demolition and construction. Some utilities may exist that were not shown on VA mapping or field investigation efforts.

Contractor to verify minimum bury depth for frost considerations other utility crossings such as electrical and proximity to new foundation system.

Verify interior pluming/utility connections with exterior conditions for sanitary, storm drain, water and condensing water.

Site logistics for delivery and laydown areas should be highly coordinated with the VA onsite staff so customer, patient and worker access is safe.

2.0 ARCHITECTURAL NARRATIVE

OVERVIEW

The project is a core and shell design of a 8-story addition (levels basement through seventh floor) to Building 1 to accommodate 16 identical air handing units (2 per floor) to supply air to each corresponding existing level. The installation of the AHU’s will be a separate project. It is designed for a future vertical expansion of four additional floors to accommodate 8 air handling units (2 per floor) to supply air to each existing upper level. The construction type will be 1A. The addition is located to the south and east of the existing elevator 7/8 tower. It abuts the existing building, covering the windows east of the elevators and the west facing windows of the southeast wing of

Building 1. Inpatient rooms requiring windows that are in these locations will be lost. Removal of the existing one story education room on the first floor is required.

Area Summaries:

• Levels 3-7 are 3094 SF each

• Levels B,1,2 are 4812 SF each

• The total area is 29,906 SF

• Future levels 8-11 will be 3094 SF each

PROJECT NO. 636-18-303 PAGE 3

INTERIOR CONSIDERATONS

• First floor corridor leading to the new doctor’s entrance will have finishes that match the facility’s current interior finish standards.

• The floors and ceilings of the mechanical rooms will be unfinished. A durable floor finish could be applied as part of the future phase.

• Each floor will have access into the mechanical room. Some remodeling of existing space will be required to provide access to the door.

• The typical mechanical room will have space to accommodate a maintenance passage to and clearances around the future AHU’s.

• As part of a future phase, remodeling of existing space will be required where the future ductwork enters the existing building under the perimeter spandrel beam and transitions up into the ceiling plenum.

• Future air ducts serving the west part Building 1 will enter just east of elevators 7 & 8.

• Future air ducts serving the east part of Building 1 will enter the west wall of the southeast wing on levels B-9.

• Future air ducts serving the east part of Building 1 will enter the south wall on levels 10-11.

TOWER EXTERIOR

• The upper part of the tower is visually broken into two forms. The primary form is clad in a composite insulated metal panel system. The color matches the clear anodized aluminum color of the metal panels on the new ACC Building. The secondary form is clad in stone that matches the existing stone in the window bands of Building 1. The stone form emulates the stone entrance and stair tower masses that anchor the ACC and matches the joint pattern.

Both forms are capped with a flat roof at level 8. The future vertical expansion will extend both forms up to a roof at level 12. The stone clad form will be capped with a flat roof and the metal panel clad form will be capped with a roof that has both sloped and flat roof design areas.

• On floors 3-7, two exhaust louvers are on the west elevation. Each will serve one of the future AHU’s. The northern most louver will be removable to provide access for the installation and/or replacement of future AHU’s. It is floor to ceiling to provide the necessary clearance. Unused portions of both louvers will be blanked off. These exhaust louvers will also be on levels 8-11 of the future vertical expansion.

• On floors 3-7, outside air intake louvers are on the south elevation. It will be subdivided to serve both of the future AHU’s. This louver will be removable to provide access for the installation and replacement of future AHU’s. It is floor to ceiling to provide the necessary clearance. The roof of the podium under these access louvers will be a staging area from which to lift them. These outside air louvers will also be on levels 8-11 of the future vertical expansion.

• All new walls are designed to meet blast protection requirements.

PODIUM EXTERIOR

• The first and second floors are clad in insulated precast concrete panels, with thin brick to match the brick of Building 1.

• Some panels on the first and second floor are removable to provide access for installation and replacement of future AHU’s

PROJECT NO. 636-18-303 PAGE 4

• The outside air intake louver serving the basement, first floor and second floor is facing west in a hood above the podium roof. The louver is 30 feet above the ground per the Physical

Security Design Manuel requirement. The hood is clad in the same metal panel system that is on the tower.

• An areaway covered by a removeable metal grate is on the south side of the podium. A louver serving the basement, first floor and second floor exhausts air into the areaway. The louver doubles as a removable access panel for the installations of AHU’s.

• The existing doctors entrance is relocated on the east elevation of the podium. The new entrance will have automatic sliding doors and will be covered by a canopy.

• All new walls are designed to meet blast protection requirements.

Design and construction to conform to all VA Design Criteria, including, but not limited to:

* PG-18-1 Master Construction Specifications

* PG-18-3 VA Design and Construction Procedures

* VA Nebraska- Western Iowa Health Care System VA Design and Construction Standards

* VHA National CAD Standard Application Guide

* VA Space Planning Criteria Chapter 312 MH RRTP

* Signage Design Guide

* PG-18-4 Standard Details and CAD Standards

* PG-18-5 Equipment Guide

* PG-18-13 Barrier Free Design Standard

* PG18-14 Room Finishes, Door and Hardware Schedule

* Manual for Preparation of Costs Estimate for VA Facilities

* PG-18-15 Minimum Requirements for A/E Submissions

APPLICABLE CODES: Work to comply with all applicable local building codes including:

* 2018 NFPA Life Safety Code

* 2015 Nebraska State Building Code

* 2012 International Building Code

* 2015 Nebraska Fire Code (incorporating 2012 IFC)

* ABAAS (Architectural Barriers Act Accessibility Standards)

* VA Barrier Free Design Standard

* 2015 Nebraska Accessibility Code

* 2015 Nebraska Energy Code (incorporating 2012 IEC Code) i

TABLE OF CONTENTS

A. Introduction

1. Purpose

2. Project Description

B. General Building Design Criteria and Assumptions

C. Structural Design Requirements

1. Building Code and Industry Reference Standards:

2. Performance Requirements

3. Sub-Structure System

4. Superstructure System

D. Mechanical Design Requirements

1. General HVAC System Description

2. Heating System Components

3. Cooling System Components

4. Controls System

E. Plumbing Design Requirements

1. Plumbing Fixtures

2. Domestic Water System Components

3. Sanitary Waste and Vent System Description

4. Storm Water System Description

F. Fire Protection Design Requirements

G. Electrical Design Requirements

1. Lighting Systems

2. Power System Requirements

3. Branch Distribution

4. Grounding System Requirements

5. Fire Alarm and Communication System Requirements

6. Firestopping

H. Technology Design Requirements

1. Telecommunications Pathways and Spaces

2. Structured Cabling System

3. Security Systems

Construction Documents Narrative for

Veterans Administration Hospital Construct Air Handling Unit Tower

Omaha, Nebraska

IMEG #19004249.01

May 26, 2021

A. Introduction

1. Purpose

a. The primary purpose of this report is to describe and provide a permanent record of the building systems for the Air Handling Unit (AHU) Tower project at the

Veterans Administration (VA) Hospital in Omaha, Nebraska. In addition to describing the systems, the fundamental assumptions used for the design are outlined. These include external and internal temperature and humidity criteria, future expansion needs, and lighting levels.

2. Project Description

a. The purpose of this project is to construct an aesthetically pleasing 7-story tower with the ability to expand to 12 stories in the future. The tower will house mechanical rooms to provide the necessary space and access to utilities for concentration of HVAC equipment serving each floor of the existing hospital facility. Two approximately equal construction phases (less than $10 million each) are planned. This narrative describes the first phase of approximately seven stories, with provisions for upward expansion in the second phase. This single tower will be located on the south side of Omaha’s VA hospital that borders Center Street.

b. The AHU Tower is designed to house approximately two (2) identical AHUs per floor that will supply conditioned air to each floor of the facility. These AHUs are intended to utilize hydronic chilled and heating water for conditioning air as well as low pressure steam for humidification. The installation of AHUs will be in separate unrelated projects.

c. Hydronic utilities (including chilled water, heating water, and low-pressure steam) are included in the design to provide immediate AHU utilization for VA Hospital AHU Tower

IMEG #19004249.01

May 26, 2021 whenever installation occurs. Domestic water utilities (including cold water, hot water, and hot water recirculation) are included in the design to provide future floor-by-floor plumbing system upgrade opportunities, but the domestic water risers will remain disconnected from the existing services to prevent possible contamination from dead legs in the system.

d. Electrical distribution is an extension of existing distribution from Building 17A.

Distribution is sized for shell and core only and is not sized for future build-out, AHU, or equipment. Refer to planning document for recommended scope for build-out.

B. General Building Design Criteria and Assumptions

1. Codes and Design Standards

a. VA HVAC Design Manual (11/1/17 edition)

b. VA Fire Protection Design Manual (12/2015 edition)

c. VA Plumbing Design Manual (11/2014 edition)

d. ASHRAE Standard 170-2013

e. VA Sustainable Design Manual

f. VA Physical Security Design Manual for Mission Critical Facilities

g. VA Omaha Facility Standards

h. Building Code - 2018 International Building Code

i. Existing Building Code - 2018 International Existing Building Code

j. Electrical Code - 2017 National Electrical Code

k. Mechanical Code -- 2018 International Mechanical Code

l. Plumbing Code - 2018 International Plumbing Code

m. Energy Conservation Code - 2018 International Energy Conservation Code

n. Fuel Gas Code - 2018 International Fuel Gas Code

2. Summer Space Environmental Requirements: 84°F ± 2°F, 60%RH high limit. These conditions are taken from the VA HVAC Design Manual for an “Air Handling Equipment

Room.”

3. Cooling Design Outdoor Air Conditions: 94.5°F db / 76.4°F wb (based on ASHRAE 0.4%

DB/MCWB for Omaha, Nebraska)

Winter Space Environmental Requirements: 50°F ± 2°F, no humidity control. These conditions are taken from the VA HVAC Design Manual for an “Air Handling Equipment

Room.”

IMEG #19004249.01

May 26, 2021

4. Heating Design Outdoor Air Conditions: -4.3°F (based on ASHRAE 99.6% Heating DB for Omaha, Nebraska)

5. Seismic Design Conditions

a. Seismic Design Category: Geotechnical report required for determination of

SDC.

b. Occupancy Category Risk Category: IV

c. Seismic bracing is required for the structures supporting mechanical/electrical equipment.

C. Structural Design Requirements

1. Building Code and Industry Reference Standards:

a. IBC, ASCE7, AISC 360, AISC 341, ACI 318, ACI 350, AWS, CRSI, AWS, ASME, FEMA, ASCE 41

2. Performance Requirements

a. Live Load

1) Building live loads are designed as follows:

a) Typical floors: 100 psf (reducible)

b) Mechanical rooms: 125 psf (non-reducible)

c) Compact storage: 400 psf (non-reducible)

d) Live load reduction: Used for columns only.

b. Snow, Wind and Seismic Loads

1) Snow load is based on ASCE7 Chapter 7 as follows:

a) Ground snow load: 25 psf

b) Importance factor: 1.2

2) Wind load is based on ASCE7:

a) Design wind speed: 124 mph

b) Importance factor: 1.0

c) Exposure class: C

3) Seismic load is based on ASCE 7.

c. Floor Flatness/Floor Levelness Criteria

1) Based on the intended use of the slab on grade and/or elevated slab, IMEG recommends the slab on grade be designed per industry standards.

IMEG #19004249.01

May 26, 2021

d. Vibration Requirements

1) Based on the intended use of the building, IMEG recommends designing the floors based on the design criteria for sensitive floors.

2) IMEG recommends providing concrete on steel deck roof to reduce the effects of noise and vibration from roof-mounted HVAC units.

e. Future Expansion: The current eight-story structure has been designed for an additional four stories added vertically with the same column bay spacing and assuming similar construction and occupancy.

f. Fire Resistance

1) Per the requirements specified by the Architect, IMEG understands that the structural system requires the following fire ratings: normal-weight concrete on steel deck provides a two-hour rating; steel columns shall be fire proofed to provide a three-hour rating.

3. Sub-Structure System

a. Foundation System:

1) A mat slab supported by cast-in-place augered piles is being used to support the building columns and superstructure. The piles are anticipated to be approximately 90 feet long and 20 inches in diameter.

2) Geotechnical testing and inspection will be required during construction to verify the actual on-site soil conditions prior to concrete placement.

b. Slab-on-grade Construction: Geotechnical report required to verify requirements.

1) The mat slab will act as the finished slab for a large portion of the building. There will be a small portion on the east side that will be a more typical slab on grade:

a) The typical slab-on-grade will be 6", 4,000 psi concrete reinforced with welded wire fabric (typically).

b) A 10 mil polyethylene vapor retarder will be provided below the slab.

4. Superstructure System

a. Floor and Roof Construction

1) Floor and Roof Construction - Composite Steel and Concrete

a) Conventional wide flange framing with welded shear studs and composite metal deck forms.

b) Two-hour fire rating is required.

IMEG #19004249.01

May 26, 2021

c) 4.5 inches of normal weight concrete on a 1.5 inch composite deck are being utilized for floor construction to meet fire ratings.

b. Columns Construction

There are three options to consider for columns:

1) Columns – Wide Flange Sections

a) Columns will be ASTM Designation A992, Grade 50 ksi steel.

b) Two-hour fire rating is required.

c) Columns will be spliced at intermediate floor levels as required.

c. Lateral Load Resisting System

1) Lateral Load Resisting System – Braced Frames and Moment Frames

a) Braced frames and moment frames will be used to provide the lateral support for the structural framing and to limit story drift of the Tower. Tube steel sections will be used for the bracing elements.

d. Exterior Enclosure: Will be finalized by Architect.

e. Structural Expansion Joints

1) A one-foot expansion joint is being utilized at the higher floors to account for the seismic spacing required. The lower floors that create the podium levels will utilize a 3” expansion joint.

D. Mechanical Design Requirements

1. General HVAC System Description

a. Existing high pressure steam, pumped condensate, and chilled water supply/return extend from tie-in points in Building 17 to the new equipment serving the AHU Tower.

b. Fan coil units connected to new heating and chilled water mains provide heating and cooling for mechanical rooms in the AHU Tower.

c. This project does not include AHUs or ventilation systems for the hospital;

AHUs will be installed in future floor renovation projects. However, this project incorporates blanked off louvers which are appropriately sized for the future air handling systems into the exterior envelope. The louvers also provide a point-of-entry for future AHU sections.

IMEG #19004249.01

May 26, 2021

2. Heating System Components

a. New 8” high pressure steam and 3” pumped condensate connections extend from the existing high-pressure steam and pumped condensate mains in the

Building 17 basement mechanical room.

b. The following heating equipment will be installed in the Building 17 basement mechanical room:

1) A new 1/3-2/3 steam pressure reducing valve (PRV) reducing the high-pressure steam to low-pressure steam (15 psig).

2) A flash tank for the high-pressure condensate.

3) Three new shell and tube heat exchangers serving the heating water system. Each heat exchanger is sized for 50% of the anticipated heating load of all future AHUs and terminal heating units included in both construction phases (providing N+1 redundancy). The PRV discharge of low pressure steam (15 psi) provides the heating source.

4) A new duplex condensate return station collecting all steam condensate associated with the heating equipment and returns it back to the pumped condensate main in the Building 17 basement mechanical room.

c. The following heating equipment will be installed in the AHU Tower:

1) Three new base mounted end suction pumps on variable frequency drives (VFDs). Each pump is sized for 50% of the anticipated heating load of future AHUs included in the first construction phase only

(providing N+1 redundancy of the lower seven stories). These pumps will need to be replaced with larger pumps in the future when the second construction phase is complete, and more than half of the planned AHUs are installed.

2) New heating water supply and return risers extending from the basement mechanical room to the top floor of the AHU Tower. Blind flanges provide connection points for future vertical expansion by the second phase of construction. Valve and caps on each floor provide connection points for future extension to the AHU coils and reheat coils.

Branch heating water piping extends to serve fan coil units in the AHU

Tower mechanical rooms.

d. Steam piping is Schedule 40 and condensate return and pumped condensate piping is Schedule 80. All steam and condensate piping require fiberglass insulation. Heating water piping is Type L copper with soldered joints and also requires fiberglass insulation.

IMEG #19004249.01

May 26, 2021

3. Cooling System Components

a. New 14” chilled water supply and return connections extend from the existing chilled water supply and return mains in the Building 17 basement mechanical room. These pipes will be routed from the connection points to the mechanical room in the basement of the new AHU Tower.

b. The following cooling equipment will be installed in the AHU Tower:

1) Three new base mounted end suction pumps on VFDs. Each pump is sized for 50% of the anticipated cooling load of future AHUs included in the first construction phase only (providing N+1 redundancy of the lower seven stories). These pumps will need to be replaced with larger pumps in the future when the second construction phase is complete, and more than half of the planned AHUs are installed.

2) New chilled water supply and return risers will be extended from the basement mechanical room to the top floor of the AHU Tower. Blind flanges provide connection points for future vertical expansion by the second phase of construction. Valve and caps on each floor provide connection points for future extension to the AHU cooling coils. Branch chilled water piping extends to serve the fan coil units in the AHU Tower mechanical rooms.

c. Chilled water piping 2” and smaller is Type L copper with soldered joints and fittings. Piping 2-1/2” and larger is Schedule 40 black steel with butt-welded, mechanically coupled, or flanged joints.

4. Controls System

a. The existing hospital is controlled by a direct digital control (DDC) system. New controllers, sensors, and actuators will be provided as part of the project and connected to the existing system.

E. Plumbing Design Requirements

1. Plumbing Fixtures

a. The following plumbing fixtures will be installed in the AHU Tower:

1) One hose bibb is provided in each mechanical room for maintenance cleaning of the future AHUs. Floor drains are provided for the future cooling coil condensate drains.

IMEG #19004249.01

May 26, 2021

2. Domestic Water System Components

a. The facility’s existing domestic cold water (CW) system, domestic hot water

(HW) heaters, and domestic hot water recirculation (HWC) pump have sufficient capacity to serve the AHU Tower.

b. The following domestic water infrastructure will be installed in the basement of

Building 1:

1) New 4” CW, 3” HW, and 1-1/2” HWC connections extend from the existing CW, HW, and HWC mains in the Building 1 basement to the

AHU Tower where they are capped for future connection. Each of these systems require a system shut down to make the new connections.

c. The following domestic water infrastructure will be installed in the AHU Tower:

1) New domestic CW, HW, and HWC risers extending from the basement mechanical room to the top floor of the AHU Tower. Blind flanges provide connection points for future vertical expansion by the second phase of construction. Valve and caps on each floor provide connection points for future extension.

2) A domestic cold water pressure reducing valve on the fourth floor creating a reduced pressure zone for the lowest five floors.

3) A twin domestic cold water riser on fifth and sixth floors for future connection to a second reduced pressure zone.

d. Domestic CW, HW, and HWC piping is Type L copper with soldered joints. All domestic CW, HW, and HWC piping requires fiberglass insulation.

3. Sanitary Waste and Vent System Description

a. The new AHU Tower requires a new 6” sanitary sewer connection. All sanitary fixtures will drain by gravity to the existing site sanitary sewer.

b. Underfloor sanitary piping is cast iron. All above grade piping is cast iron no-hub.

4. Storm Water System Description

a. New primary and secondary roof drains provide storm drainage for the roof of the AHU Tower. The new primary roof drains connect to a new 8” storm service connection for the addition. The new secondary roof drains connect to a lambs-tongue fitting and will spill onto grade.

b. All primary and secondary storm piping is cast iron with fiberglass insulation.

Horizontal leaders from roof drains to storm risers is heat traced.

IMEG #19004249.01

May 26, 2021

c. New drain tile installed around the AHU Tower basement foundation connects to a duplex sump pump located in the basement mechanical room. The sump pump discharge connects to the new 8” storm service connection exiting the building.

F. Fire Protection Design Requirements

1. Each floor of the existing building is served by an automatic fire protection system. New branch piping will be extended from the existing zones on each floor into the new AHU

Tower mechanical room on the associated floor. Upright sprinklers protect the new mechanical rooms. The mechanical rooms on each floor of the AHU Tower are categorized as Ordinary Hazard Group 1.

2. The facility’s existing fire pump will not be modified or affected as part of this project.

3. No dry fire protection systems are required.

4. Fire Protection piping is Schedule 40 black steel with threaded connections for 2” and smaller, and Schedule 10 black steel with rolled groove connections for 2-1/2” and larger. Flexible connections from piping to sprinklers will be used as allowed by VA specifications.

G. Electrical Design Requirements

1. Lighting Systems

a. System Narrative

1) Lighting design for this project will meet current Illuminating Engineering

Society recommended illuminance targets.

2) Additional mandatory controls for lighting that include manual switching, automatic controls to reduce lighting levels, and day lighting controls will be installed.

3) All luminaires will have a Correlated Color Temperature (CCT) °K and a minimum Color Rendering Index (CRI) of 80.

b. Average Illumination Levels: The average maintained illuminance levels are indicated in the table below.

c. Lighting System Components

1) Interior Luminaires

a) LED luminaires will be used for general lighting.

IMEG #19004249.01

May 26, 2021

2. Power System Requirements

a. Normal Distribution

1) New 277/480 volt normal power for phase one will be provided by a new distribution panel located on the basement floor. This distribution panel will be fed from existing panel DP-H located in existing Building 17A.

One 4” empty conduit will be extended to each upper floor (total of 11) for future 277/480 volt panels. These conduits will be capped at each floor, labeled, and not allowed to be used for any other function than the future phase 277/480 volt tower loads.

2) Phase one 120/208 volt loads will be served by new branch panels in four groups; basement through second floor, third through fifth floor, sixth through eighth floor, and ninth through twelfth floor. These new panels will be served by four existing spare 225A breaker cubicles located in existing unit substation SB-2 in Building 17A. Each group will be feed through style with a disconnect for each panel to allow local shut off with affecting the whole group.

3) New normal power branch lighting and receptacle loads on each floor will be served from the new 200-amp, 208/120 volt, 3-phase, 4-wire branch circuit panel located on that floor.

b. Emergency Distribution

1) Existing unit substations in Building 17A have the ability to switch between circuits 90 and 95 on the campus’s medium voltage primary loop. Circuit 95 is currently backed up by the campus’s 15kV 3MW generator. This allows for generator backup of phase one equipment should the owner desire this equipment to be on generator backup power.

3. Branch Distribution

a. Branch circuit panels serving lighting and receptacle loads will use molded case, thermal magnetic type circuit breakers.

b. Branch circuit panelboards will be sized with a minimum of 20% spare circuits.

Where panelboards are flush mounted or installed in closets less than 2’ deep, five empty 1” conduits will be stubbed into an accessible location above the ceiling for future use.

c. Branch circuit panelboards will be provided with door-in-door construction with copper bussing.

IMEG #19004249.01

May 26, 2021

d. Branch circuit design will be based on a maximum of 1,900 volt amperes per

20 ampere, 120 volt circuit, and 4,400 volt amperes per 20 ampere, 277 volt circuit.

e. 120 volts will be used for all general purpose lighting.

f. All receptacles will be hospital grade with unbreakable thermoplastic coverplates.

g. GFCI receptacles will be provided in exterior locations.

h. GFCI receptacles with weatherproof, heavy duty in-use covers will be provided on the exterior of the building and near all roof-mounted mechanical equipment.

i. Devices will be red in color for emergency circuits.

j. Minimum wire size will be #12 for power circuits and #18 for controls circuits.

k. A dedicated neutral conductor will be provided in all branch circuits.

l. Feeder sizes will be increased as required to limit voltage drop from the branch circuit panel to the terminal device to not more than 3%.

m. Motor Connection and Control

1) Motors 3/4 horsepower and larger will be served at 480 or 208 volt, 3-phase, 3-wire. Motors less than 3/4 horsepower will be served at

120 volt service, 1-phase, 2-wire as applicable. Heating, ventilation, air conditioning, and other mechanical loads will generally be served at

480 volt, 3-phase, 3-wire.

2) Fans and large pumps will be controlled by VFDs. Smaller motors will be controlled by full voltage starters or manual starters as required.

4. Grounding System Requirements

a. A grounding system and equipment grounding will be provided per National

Electrical Code Article 250 for transformers, motor starters, panelboards, switchboards, transfer switches, wiring systems, etc.

b. A green insulated equipment ground copper conductor, sized per National

Electrical Code 250.122, will be run with all feeders and branch circuit homeruns.

IMEG #19004249.01

May 26, 2021

5. Fire Alarm and Communication System Requirements

a. A new fire alarm control panel will be provided on the first floor to allow for connections of phase one and future phase devices. This fire alarm control panel will report to the main fire alarm control panel for the campus.

b. Notification appliance circuit panels will be sized for 24 hours of standby operation and 15 minutes of alarm.

c. System notification will consist of ADA- and NFPA-compliant audio, visual, and combination audio/visual devices.

d. System initiation will consist of individually addressable analog smoke and heat detectors, addressable fire pull stations, and sprinkler system flow switches.

e. Smoke detectors will be located in mechanical rooms and areas open to the corridor.

f. Duct-type smoke detectors to close smoke dampers and shut down air distribution systems will be provided.

g. Heat detectors will be provided in janitors’ closets and some mechanical rooms.

h. Pull stations will be located within a travel distance of 200 feet and at all exterior exits.

i. All fire alarm system wiring will be installed in red-colored conduit.

6. Firestopping

a. All penetrations to fire rated wall will be fire stopped.

H. Technology Design Requirements

1. Telecommunications Pathways and Spaces

a. Interior Pathways

1) Wall penetrations into the new area will be required for new and future telecommunications cabling. For penetrations serving more than 12 cables, mechanical firestopping will be required.

2. Structured Cabling System

a. Extension of the existing telecommunications infrastructure will be designed and installed to EIA/TIA requirements and the current VA standards. This

IMEG #19004249.01

May 26, 2021 infrastructure will support equipment installed in the current phase and support additional needs in the future.

b. The system will be required to be fully tested to CAT 6 performance requirements and will be tested at 250 MHz.

3. Security Systems

a. Access Control System

1) New card readers (smart card), door contacts, electrified hardware, request to exit devices, and control panels will be installed to support the exterior portal and connect via copper cable to the existing access control system head end.

b. Surveillance System

1) New exterior wall mounted camera at the exterior portal will be installed and cabled via copper cable to the existing surveillance system head end.

Prepared by: Eric Henderson, PE

ADC:DJL:EJH:ADT:KLS:DMD/amb:rjb \\files\Active\Projects\2019\19004249.01\ReportsNarratives\03_CD Narrative\20210526 CD Narrative_VA Omaha AHU Tower.docx