Attch 2 - 2019_1211 Design Analysis B1560.pdf

DESIGN ANALYSIS

AJXF 16-1563

Repair Roof & HVAC Navy Facility, Building 1560 Joint Base Andrews, MD

CONCEPTUAL DESIGN

MARCH 13, 2020; Revised August 31, 2020

Base Civil Engineering

11 CES/CENM

3710 Fetchet Avenue Joint Base Andrews MD 20762-4803

Design Analysis Repair Roof & HVAC Navy Facility B1560 Joint Base Andrews, MD

Page Left Intentionally Blank

TABLE OF CONTENTS

PART I DESIGN ANALYSIS

A. Architectural

1. Flooring

2. Partitions/Doors

3. Ceilings

4. Exterior Work

B. Interior Finishes C. Exterior Walls

1. Summary

2. Brick Masonry

3. Windows and Exterior Paint

4. Concrete Beam Repair

D. Roof

1. Summary

2. Roof Repairs

E. Structural

1. References

2. Design Criteria

3. Summary

4. Scope Items

5. Out of Scope Items

F. Plumbing

1. Scope of Work

2. Existing Conditions

3. Design Criteria

4. New Work

G. HVAC

1. Scope of Work

2. Existing Conditions

3. Design Criteria

4. New Work

H. Fire Protection/Life Safety

1. Building Code Analysis, Occupancy Classification

2. Compliance with UFC 3-600-01 and National Fire Codes

3. Analysis of Automatic Sprinkler Systems and Suppression Systems and Protected Areas, including Hydraulic Analysis of Required Water Demand

4. Water Supplies, Water Distribution, Location of Fire Hydrants

5. Smoke Control Methods and Smoke Control Systems

6. Fire Alarm System and Connection to the Base Fire Alarm Reporting System

7. Mass Notification System

8. Standpipe Systems and Portable Fire Extinguishers

9. Coordination with Security and Antiterrorism Requirements

10. Fire Protection During Construction

11. Fire Department Access

I. Electrical

1. Scope of Work

2. Existing Conditions

3. Design Criteria

4. New Work

J. Civil/Site

1. Scope of Work

2. Existing Conditions

3. Design Criteria

4. New Work

PART II SPECIFICATIONS

A. Division 01 B. Division 2 through 34

PART III APPENDICES

A. Advanced Final Design Submission Comments/Responses B. RFI’s C. Cost Estimate D. QC Checklist

End of Table of Contents

PART I DESIGN ANALYSIS

A. Architectural

Building 1560 is located at Joint Base Andrews in Maryland. The building was constructed in 1961 as a dormitory, and later converted to accommodate the Naval Communications Security Material System. This facility houses a 24/7 critical mission that must remain in operation for the duration of the project. In general, the building is occupied between 6 am and 6 pm, Monday through Friday. However, mission operations sometimes require that the building be occupied outside of those hours. The work must be phased so as not to impact mission operations. The building is a controlled/restricted area, and escort will be required for workers without appropriate clearances. Accessibility for disabled employees must be maintained for the duration of the project.

The following Unified Facilities Criteria (UFC), and other codes and standards, are referenced for the Architectural portion of this project. No waivers or exceptions are required:

UFC 1-200-01 DoD Building Code (General Building Requirements) UFC 1-200-02 High Performance and Sustainable Building Requirements UFC 3-101-01 Architecture UFC 3-110-04 Roofing Maintenance and Repair UFC 3-120-01 Design: Sign Standards UFC 3-120-10 Interior Design UFC 4-010-01 DoD Minimum Antiterrorism Standards for Buildings UFC 4-010-05 Sensitive Compartmented Information Facilities IBC 2015 International Building Code IEBC 2015 International Existing Building Code ABA 2015 The Architectural Barriers Act Standards AFMAN 32-1084 Facility Requirements Standards

The architectural scope of work in B1560 includes supporting the work of the other disciplines, such as repair or replacement of partitions, ceilings, flooring, and other finish materials required by mechanical, electrical, or fire protection work, as well as miscellaneous finish upgrades throughout the building. Investigations of existing conditions included on-site field investigations, and examination of records and documents provided by the Government.

Building 1560 must meet the security requirements of Secure Room with Open Storage Secret.

As such, any penetrations through the exterior walls and roof which measure 96 square inches or more must have grating installed per DODM 5200.01.

1. Flooring

The floor finish materials are to be replaced throughout. Replace all carpet on the 1st, 2nd, and 3rd floors in corridors and office areas with a product compatible with high traffic. Also, replace the rubber flooring, including risers and treads, in the center stair.

Existing ceramic tile flooring in the rest rooms is to remain, as is the existing concrete flooring finish in the north and south stairs

2. Partitions/Doors

The building is to be repainted throughout, including all partitions, doors, and frames.

On the 3rd floor, the existing Acrovyn panels in the corridor are to be removed and replaced with gypsum wallboard, properly finished and painted.

In the Ladies room on the 3rd floor, remove the existing urinals. The existing solid surface wall panels at those locations are to be replaced as required.

3. Ceilings

HVAC work on the 3rd floor requires removal and replacement of the existing suspended acoustical ceiling system, including grid, supports, tiles, lighting, and HVAC and fire alarm devices. This work is generally limited to Corridor 300.

In addition, all damaged acoustical ceiling tiles are to be replaced as required throughout the building.

4. Exterior Work

A new dumpster pad and enclosure are to be provided. The location must comply with ATFP setbacks and other requirements, and is to be located so as to be convenient for Building 1560’s users, and readily accessible to the trash removal contractor.

Two pine trees located at the west side of the building are to be removed. The stumps are to be removed as well, and topsoil and sod provided as required. Compensatory planting is to be coordinated with Joint Base Andrews.

B. Interior Finishes

Office Spaces-3rd Floor: carpet tile in administrative spaces; linear vinyl tile in break areas and support spaces; rubber base; painted gypsum board walls; suspended acoustical tile ceilings.

Stairs: textured rubber tile on landings and treads; rubber base on landings; painted walls;

painted gypsum board ceilings.

Corridors: carpet tiles; painted walls; rubber base; suspended acoustical tile ceilings.

C. Exterior Walls

In general, the design requirements follow the guidance of the following Unified Facilities Criteria for this portion of the work unless otherwise indicated:

• UFC 1-200-01 DoD Building Code (General Building Requirements)

• UFC 3-101-01 Architecture

1. Summary

Scope of work includes addressing various deficiencies on exterior walls such as:

- removal abandoned mechanical equipment and patching openings

- filling repairing damaged exposed concrete beam

- repair of masonry deficiencies (abandoned holes, brick cracks, step cracks)

- enlarging existing expansion joints and providing adequate means of thermal movement of the masonry

- replacement of all sealants on the building

- sealing windows with clear silicone sealant

All exterior wall repairs will be warranted for a period of 2 years for discoloration, mismatch, fracturing, and efflorescence from improper repair technology.

2. Brick Masonry

Various pieces of mechanical equipment are being removed under the scope of this project. See mechanical narrative for more information. The openings of removed components will be patched with matching masonry veneer. Internal load bearing wall is concrete masonry unit (CMU) with no air/water barrier or thermal insulation indicated on existing condition drawings.

It is in the contractor`s scope to determine actual wall composition and to patch all wall components.

Approximately 50 weep holes will be drilled (including providing of new opening or repair of existing clogged ones) at locations of through-wall flashings. Activity aims to restore and improve drainage of existing wall cavity. Locations include through-wall flashings over doors, windows and at the junction with the foundation.

Multiple cracks, including step cracks, were observed on the brick veneer. Masonry cracks are being repaired. Step cracks will be addressed via repointing the joints as specified in section 01 10 10. For proper repair, cracks engaging the bricks themselves require complete replacement of masonry in affected area. To ensure match of existing façade to the greatest extent possible, 24’’ x 24’’ brick masonry mock-up panel will be provided to the Government for approval.

Existing masonry expansion joints do not provide adequate means for thermal/moisture movement of the masonry. Joints are being enlarged and the existing sealant is being removed.

Repaired expansion joints will be filled with ASTM C920 sealant and bond breaker. design-build (DB) contractor shall provide expansion calculations to determine adequate joint size, sealant class and width-to-depth ratio.

3. Windows and Exterior Paint

All existing sealant joints will be replaced including doors, windows, window sub-sills and masonry joints. Color will match masonry and will be approved by the Government. Windows will be sealed to improve energy efficiency of the building though reducing air infiltration through the windows. This effort will make windows inoperable. All glass panels will be wet-sealed at the interface with the frame. Window frames, sashes and operable parts will be sealed with clear silicone sealant on both sides. Window seal work will be warranted for 5 years.

One exterior door is being re painted due to corrosion observed in the lower part. Surfaces will be prepared with mechanical tools to remove all loose matter, contamination and rust. Entire door will be painted to avoid mismatch between old and new color. DB contractor will further paint all new exterior construction per API Architectural painting specification.

4. Concrete Beam Repair

Locations of damaged concrete beam repair will be repaired with polymer-modified high-strength concrete. Deficiencies include spalling concrete, cracks and exposed rebars. Those need to be repaired to avoid further water infiltration and deterioration of the structure. DB contractor, using licensed structural engineer will develop exact techniques using American Concrete Institute (ACI) recommended practices.

After completion of the repairs and concrete curing process, entire exposed concrete beam and fascia will be painted with high-performance, moisture permeable elastomeric coating.

D. Roof

1. Summary

Existing roof on B1560 is currently under warranty. PRIME AE contacted roofing manufacturer

– Johns Manville – and had them repair some of the deficiencies that were under the currently effective warranty. DB contractor will be responsible for:

- repairing roof membrane creases on approximately 250SF

- replacement of roofing in roof area D DB contractor will further address roof repairs necessitated from HVAC repairs and alterations.

These items include:

- Patching of structural deck and roofing at locations of removed mechanical equipment

- Installing elevated metal equipment frame and associated waterproofing

- Modification or replacement of curbs for mechanical equipment

New standing seam metal roof on new steel construction will be installed on the west side of the building over the stairs leading to underground floor.

All roof repairs on area A will be warranted for weathertightness for period of 5 years by the roofing installer. Roofing assembly on roof area D will be warranted by roofing manufacturer for 20 - year and by roofing installer for 5-year, both effective from the date of substantial completion.

2. Roof Repairs

Creases on the existing cap sheet will be repaired through cut of creased area and application of new modified bitumen cap sheet over the entire area of deficiencies. There will be no disturbance of roof insulation.

On roof area D, built-up roof assembly will be removed and replaced with Modified bitumen roof over cover board, over tapered rigid insulation over existing concrete deck.

All repairs of roof area A will match composition of existing roofing in terms of assembly components and thickness. Over metal corrugated deck, patch will be a piece of deck with matching profile. Over concrete deck, patched will be flat steel plate or decking attached to the top of existing concrete with new concrete topping. Repairs and waterproofing associated with new supports or mechanical components will be performed utilizing standard waterproofing techniques per NRCA roofing and waterproofing manual. Alternatively, 20-year warranted reinforced liquid flashing could be used.

Deficiencies such as existing roof granulation loss, standing water on the roof, and inadequate drainage will not be addressed in the scope of this project nor by manufacturer warranty services.

Manufacturer has inspected the roof and indicates they will maintain the warranty of the roof.

All roof repairs will be made consistent with and approved by the Manufacturer.

E. Structural

1. References

All structural work shall be completed in accordance with the following codes and standards.

a. IBC International Building Code

b. IEBC International Existing Building Code

c. ASCE 7 American Society of Civil Engineers, Minimum Design Loads For

Buildings and Other Structures

d. AISC Manual American Institute of Steel Construction, Manual of Steel

Construction, Fourteenth Edition, Allowable Stress Design (ASD) or Load and Resistance Factor Design (LRFD).

e. ACI 315 Manual of Standard Practice for Detailing Reinforced Concrete Structures

f. ACI 318 Building Code Requirements for Structural Concrete

g. ACI 530 Building Code Requirements and Specifications for Masonry

Structures

h. ACI 546R Guide to Concrete Repair

i. AWS D1.1 American Welding Society, Structural Welding Code – Steel

j. UFC 2-200-01 General Building Requirements

k. UFC 3-301-01 Structural Engineering

l. UFC 3-310-04 Seismic Design for Buildings

m. UFC 3-190-06 Protective Coatings and Paints

n. UFC 4-010-01 DoD Minimum Antiterrorism Standards for Buildings

o. UFC 4-020-01 DoD Security Engineering Facilities Planning Manual

2. Design Criteria

Dead Loads: Actual Live Loads Per UFC 3-301-01 Wind Loads Design Wind Speed 120 mph Risk Category IV Exposure Classification C Seismic Ss 0.12 S1 0.05 Risk Category IV Site Class (Assumed) D Ground Snow Load 25 psf Ground Frost Penetration 26 inches

3. Summary

Building 1560 is a 3-story, cast-in-place concrete structure with infill masonry.

According to the existing drawings, the second, third, and roof structures are two-way flat slabs. The existing drawings also indicate that the first floor is also a two-way flat slab.

The existing drawings were completed in 1955 and it is assumed that construction commenced soon thereafter. The scope of the project generally involves ancillary items associated with plumbing and mechanical improvements.

4. Scope Items

a. The rooftop mechanical units will be replaced. The intent is to reuse the existing mechanical curbs to prevent the addition of additional penetrations through the roof structure. It is expected that the replacement rooftop mechanical units will be approximately 15 percent heavier than the existing units. In accordance with the IEBC 807.4, an analysis of the existing structure shall be completed to verify the capacity of the roof structure has not been exceeded. Per IEBC 807.5, existing structural elements resisting lateral loads shall be evaluated with for the increased loads.

b. The removal of existing roof rooftop mechanical equipment will leave abandoned roof structure penetrations. These penetrations shall be infilled. The patches shall be made using a polymer-modified, portland-cement repair mortar. Penetration repairs shall provide a flush smooth surface on both the top and bottom of the slab.

Repairs shall be designed to support all dead, live, and snow loads per the UFC 3- 301-01.

c. Infill unused mechanical louver wall openings will concrete unit masonry. Concrete masonry shall be designed and installed per ACI 530.

d. New plumbing penetrations may be required for this project. As previously mentioned, the building is a two-way, flat slab. Any penetrations shall be diamond core drilled. Prior to coring the slab, GPR shall be completed to locate and avoid slab reinforcement. Penetrations shall not be made in the shearhead areas as noted on the existing drawings.

e. A new dumpster enclosure will be added for this project. The dumpster enclosure will be constructed of a free-standing concrete masonry wall on three sides supported on a continuous shallow foundation. A gate will be installed on the open side and a concrete slab on grade will be poured.

f. An awning/canopy shall be constructed on the west side of the building to protect the mechanical basement access area. The canopy will be approximately 12 feet by 30 feet. It shall be designed to divert precipitation and leaves away from the mechanical basement entry structure. The canopy will be a column supported, structural steel canopy with shallow foundations. The steel members shall be galvanized and painted. All steel members shall be designed and detailed per the AISC Steel Construction Manual.

5. Out of Scope Items

a. Exterior window and door replacement is not anticipated for this project.

b. Project costs are not expected to exceed 50 percent of the Plant Replacement Value of the building. Therefore, no analysis nor retrofit will be required for either antiterrorism, force protection or progressive collapse.

F. Plumbing

1. Scope of Work

Plumbing work in the scope for Building 1560 includes both demolition and new work:

a. Replace six water coolers.

b. Remove existing urinals in the female restroom. Add ADA compliant fixtures.

c. Add instant-hot water dispenser in break room sinks.

d. Extend new rooftop unit condensate to the closest roof drain.

e. Provide new sump pumps in the basement mechanical room.

Equip sump pumps with emergency power (i.e. battery back-

up) and audible alarm.

f. Replace aged cast/black iron sump pump drain lines with

PVC.

g. Clean/snake out floor drains in basement and areaway drain in the exterior stairwell to the basement.

2. Existing Conditions

The plumbing systems work in Building 1560 is primarily in the basement and on the 3rd floor but covers all three floors. The following are the areas of concern:

a. Electric Water Coolers: Six (6) electric water coolers in the corridors on the 1st, 2nd and 3rd floors are aged; two on each floor.

b. 3rd Floor Women’s Room: The women’s room has three (3) urinals.

c. Break Rooms: The break rooms on the 1st and 3rd floors do not have instant-hot water dispensers and they are desired.

d. Roof Unit Condensate: The condensate drain from Dedicated Outside Air System (DOAS) unit on the roof does not currently extend to a roof drain.

e. Sump Pumps: Two foundation drain sump pumps in pits in the basement utility room are aged. The original sump pump in the southeast corner is a duplex pump designed with each pump capable of pumping 79 gpm with 29 ft of head.

f. Sump Pump Drain Lines: The drain lines on the discharge side of the sump pump are a pieced together with a variety of piping types.

DOAS Condensate Drain

Basement Sump Pumps and Drain Pipes

g. Drains: The areaway and the basement have flooded several times. The drain lines and drains do not drain well causing a backup of water.

3. Design Criteria

Design and installation will be in accordance with the International Plumbing Code (IPC), including the IPC supplemental requirements within UFC 3-420-01, Plumbing Systems, and in accordance with all Government requirements, regional, and national applicable codes, and UFC criteria effective at issue date of the RFP.

New plumbing fixtures and faucets will meet the water-efficiency requirements of UFC 3-420-01, Plumbing Systems, and UFC 1-200-02, High Performance and Sustainable Building Requirements, which requires compliance with ASHRAE 189.1, Standard for the Design of High-Performance Green Buildings, Section 6.3.2 (Building Water Use Reduction).

Advance Metering and On-Site Renewable Energy and Solar Hot Water study will not be required for this project. New Metering and new domestic water heater are not in scope for this project. Existing gas meter and domestic water heater will remain and be reused.

4. New Work

The demolition and new plumbing work in Building 1560 is:

a. Electric Water Coolers: Six (6) electric water coolers in the corridors on the 1st, 2nd and 3rd floors, two on each floor, will be replaced. The EWCs will be ADA compliant with a single fountain. Piping will be provided/adjusted as required to connect to the existing domestic cold water and sanitary systems. An individual stop will be provided at each.

b. 3rd Floor Women’s Room: The three (3) urinals in the women’s room will be demolished. Piping will be demolished to the point of concealment and capped.

c. Break Rooms: The break rooms on the 1st and 3rd floors will be provided with new instant-hot water dispensers adjacent to the sink. Piping will be provided as required to connect to the existing domestic cold water system. An individual stop will be provided at each.

d. Roof Unit Condensate: The condensate drain from the new DOAS unit on the roof will be extended to a roof drain.

e. Sump Pumps: A new, duplex sump pump will be provided in the basement utility room using one of the existing foundation drain sump pits. The new unit will consolidate the functions of the two (2) existing sump pumps and should have a capacity like the original duplex pump capacity. Audible alarm and visual alarms will

Replace 6 Electric Water Coolers be provided to notify building personnel when the water level in the sump hits a high limit or if the pump fails to operate. These alarms will be connected to the direct digital control (DDC) system to provide notifications.

f. Sump Pump Drain Lines: The drain lines on the discharge side of the sump pump will be replaced with PVC in the basement mechanical room.

g. Drains: The areaway and the basement below grade drain lines and drains will be cleaned and snaked out to remove foreign matter.

The building will be occupied during construction. Equipment replacements and piping installation will be coordinated to allow service to continue through most of the building while portions are renovated. Shutdowns and new connections will require coordination and probable off hour work.

G. HVAC

1. Scope of Work

The mechanical work for this project includes both demolition and new work:

a. Replace R-22 cooling generation and distribution systems including:

1) One (1) Air-Cooled Chiller

2) Packaged Direct Expansion (DX), rooftop Dedicated Outside Air System

(DOAS) to serve entire building including 3rd floor that is not currently served.

3) Six (6) Mini-split AC units serving Server Rooms and Computer Rooms.

4) One (1) packaged Rooftop Unit (RTU) serving the Elevator Machine Room.

b. Replace ductwork above the roof.

c. Provide DOAS distribution (insulated ductwork and air devices) to individual spaces on the 3rd floor.

Recommended additional mechanical work is:

a. Replace office area 2-pipe fan coil units (FCUs) with 4-pipe FCUs.

b. Remove dual temperature water distribution system and provide separate chilled and heating water systems distributed to HVAC equipment including each FCU throughout the building, heating only units and new DOAS unit.

c. Replace basement mechanical room exhaust fan.

d. Remove exhaust ductwork and grilles extended from toilet exhaust systems on 3rd floor. Patch ductwork and rebalance systems.

2. Existing Conditions

The fuel sources for Building 1560 are natural gas and electricity. Most of the mechanical systems in Building 1560 were installed around 1962, 55 years ago, and are due for replacement. The existing mechanical systems are:

a. Dual Temperature Water System: The dual temperature water system has pumps in the basement mechanical room and distributes either heating hot water or chilled water in a loop through the 6-foot-high crawl space below the first floor, up to FCUs. In the heating season, radiation and cabinet unit heaters are also served.

1) The natural gas fired boiler is in good condition.

Original design drawings indicate a heating hot water supply temperature of 180°F. The boiler will not be replaced.

2) One (1) 70-ton, air-cooled chiller, Trane model RTAA070AYM01A3COB. The chiller uses R-22 (a refrigerant which ends production in 2020) and has some rust. Original design drawings indicate a chilled water supply temperature of 48°F.

Air-Cooled Chiller

3) Two (2) 5-HP, base-mounted constant volume (CV) pumps with a capacity of 197 gpm each and associated expansion tank, air separator, etc.

4) Room FCUs are older, 2-pipe units that were not sized for the current occupancy. They were installed as part of the original building construction as a dormitory and have exceeded their anticipated life span.

5) Finned radiation and cabinet unit heaters were installed during the original construction and have also exceeded their anticipated life span.

6) The dual temperature water and condensate drain piping was installed with the FCUs, about 55 years ago, and has reached the anticipated life span.

Piping is reported to be leaking.

b. DOAS System: The packaged, rooftop unit provides approximately 4,000 cfm of 100% outside air to the 1st and 2nd floors and is a Lennox LCC180, 15-ton unit. It uses R- 22 refrigerant and does not include energy recovery. The unit was installed around 2004 (14 years ago) and is nearing the anticipated life expectancy of about 15 to 20 years. The duct work shows signs of deterioration.

c. 3rd Floor Exhaust: The 3rd floor toilet exhaust system has been extended down the corridor with grilles from each space to provide exhaust from the entire floor. Since this air is not replaced with conditioned make-up air, the exhaust system is bringing unconditioned outside air in through whatever cracks are available.

d. Server Rooms: The server rooms (rooms 206, 207, 208, 209 and 318) are cooled by split systems with roof mounted air-cooled condensing units. All the split systems use R-22 refrigerant and are nearing the end of their anticipated life span.

e. Elevator Machine Room (EMR): The EMR is served by an RTU that uses R-22 refrigerant.

f. Basement Exhaust Fan: The exhaust fan serving the basement mechanical room is no longer functional.

3. Design Criteria

Design and installation will be in accordance with the International Mechanical Code (IMC), including the IMC supplemental requirements within UFC 3-410-01, UFC 3-400- 02, Engineering Weather Data, and UFC 3-401-01, Mechanical Engineering, and in accordance with all Government requirements, regional, and national applicable codes, and UFC criteria effective at issue date of the RFP.

DOAS and Ductwork

Server Room Condensing Units

3rd Floor Exhaust

Calculations for the HVAC system simulation including heating and cooling loads and energy use analysis will be performed with a computer simulation program that meets ANSI/ASHRAE/ACCA Standard 183, Trane TRACE. A 40-year Life Cycle Cost Analysis (LCCA) will be performed to determine the replacement HVAC systems in accordance with UFC 1-200-02 and using the National Institute of Standards and Technology (NIST) BLCC program. The goal is to achieve 30% energy reduction compared to ASHRAE 90.1 base building design in accordance to UFC 1-200-02.

However, if the goal is not life-cycle cost-effective, the proposed building system should achieve an energy consumption level at the highest level of energy efficiency that is life-cycle cost-effective.

The design parameters that will be used to determine the heating and cooling loads are provided below:

a. Outdoor Conditions: In accordance with UFC 3-410-01, base outdoor conditions from the latest UFC 3-400-02 Engineering Weather Data for Andrews AFB, Maryland.:

1) Outdoor conditions for cooling are:

a) The 1.0% dry bulb (DB) and corresponding mean coincident wet bulb

(MCWB).

b) The 1.0% humidity ratio (HR) and corresponding mean coincident dry bulb (MCDB) temperature.

c) Size condensers and condensing units for 5°F above the outdoor temperature.

Condition °F DB °F WB °F DP

1.0% DB/

MCWB

91.0 74.0 66.93

1.0% HR/ MCDB 80.2 75.3 73.5

Table 1. Outdoor Conditions for Cooling Design

2) Outdoor conditions for heating are the 99% dry bulb (DB): 18.0°F.

3) Design preheat coils for an outside DB temperature of 18.0°F.

b. Indoor Conditions: The required conditions in UFC 3-410-01, Change 4, 01 November 2017 and used in the LCCA are:

1) Indoor conditions required for cooling and heating are:

2) For unoccupied mode, provide the following night setback temperatures:

3) Humidification is not required.

4) Provide dehumidification by cooling the air to a dew point of 57.9°F or lower.

c. Building Envelope: The approximate existing envelope U-values shown below are greater than current ASHRAE values:

1) Exterior Walls: U = 0.24 btuh/SF-°F

2) Roof: U = 0.07 btuh/SF-°F

3) Windows: U = 0.95 btuh/SF-°F

Heating/Cooling System Serving

Space Type Cooling Heating

DB, °F % RH DP, °F DB, °F

FCUs and DOAS

Office 78.0 - 55.0 68.0 Conference 78.0 - 55.0 68.0

Storage/Vault 78.0 - 55.0 68.0 Break Room 78.0 - 55.0 68.0

Gym 78.0 - 55.0 68.0

Corridor 78.0 - 55.0 68.0 Cabinet Unit Heaters Stairwells none none none 68.0

Dedicated Split System Computer/Server Room 72.0 - 55.0 68.0

Dedicated Split System Elevator Machine

Room

78.0 - 55.0 68.0

Radiation Toilet Rooms* none none none 68.0 None Janitor’s Closet** none none none 68.0

* Replace FCUs in toilet rooms with cabinet unit heaters ** Fully interior rooms not heated

Table 2. Indoor Conditions for Cooling and Heating

Space Type Cooling Heating

DB, °F % RH DP, °F °F DB

Office 85.0 - - 55.0

Conference 85.0 - - 55.0

Storage/Vault 85.0 - - 55.0

Break Room 85.0 - - 55.0

Gym 85.0 - - 55.0

Corridor 85.0 - - 55.0

Stairwells none none none 55.0

Computer/Server Room* 72.0 - 55.0 68.0 Elevator Machine Room* 78.0 - 55.0 68.0

Toilet Rooms none none none 55.0

Janitor’s Closet none none none 55.0

* No unoccupied setback Table 3. Indoor Conditions for Unoccupied Cooling and Heating

d. Internal Loads: Verify the occupancy and heat loads from all sources including Government furnished equipment prior to performing calculations. Internal loads are only considered for spaces requiring cooling. Heat gains for occupants are based on the values in the ASHRAE Handbook – Fundamentals.

Space Type Occupants Heat Gain/Person

Sens/Latent (btuh)

Lighting

(W/SF)

Equipment

(W/SF)

Office Seat count 250 / 200 1.11 0.5

Conference Seat count or 20 sqft/person

250 / 200 1.23 1.0

Storage/Vault 0 - 0.98 0 Break Room 30 sqft/person 250 / 200 0.73 0

Gym 4 710 / 1,090 1.11 1.5 Corridor 0 - 0.66 0

Computer/Server 0 - 1.71 1.53 Elevator Machine Room 0 - 0.42 1,200**

Table 4. Internal Loads

e. Occupancy Schedule: The building is primarily occupied from 6am to 6 pm Monday through Friday. However, the building is occasionally occupied outside of these hours due to mission operations.

f. Ventilation: Ventilation rates will be in accordance with ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality. The required ventilation will be provided through the DOAS unit ducted to each space. Air will be transferred from each room and returned through the corridor plenum to an open end duct and then to the DOAS unit on the roof.

Space Type Outdoor Air Exhaust Air, CFM CFM/Person CFM/SF Office 5 0.06 0

Conference 5 0.06 0 Storage/Vault 0 0.12 0 Break Room 5 0.12 0

Gym 20 0.06 0 Corridor - 0.06 0

Computer/Server 5 0.06 0 Elevator Machine Room 0 0 0

Toilet - - 50 / fixture Table 5. ASHRAE Required Ventilation

g. Moisture: A psychrometric analysis documenting that the system meets the design criteria will be provided.

4. New Work

New HVAC systems will be provided for Building 1560 and Elevator Machine Room.

The system types for Building 1560 will be determined by the LCCA. LCCA for the Elevator Machine Room is not required.

The existing equipment and systems will be demolished including piping, ductwork, controls and appurtenances except the heating hot water boiler and ventilation ductwork serving the first and second floors will remain and be reused.

Building 1560 shall be conditioned with localized four pipe fan coil units. Building heating water will be provide via the existing gas-fired heating water boiler. Adjust boiler flue as required to accommodate new outdoor rear canopy. Building chilled water will be provided via an air-cooled chiller located outside with a chilled water temperature of 44°F and rise in temperature of 12°F. Provide heat tracing for chiller. Pairs of variable volume pumps will be provided for both the chilled and hot water systems. Ventilation to the building will be provided via a Dedicated Outdoor Air System (DOAS) with chilled and heating water coils including an energy recovery wheel. The DOAS unit will connect to the existing ventilation ductwork and air devices serving the first and second floors.

New ductwork and air devices will be distributed throughout the third floor and connect to the existing ventilation duct riser serving the first and second floor. New piping will connect the existing boiler and new chiller to the building HVAC systems. Isolation valves shall be provided to/from each floor. Computer/server rooms and the Elevator Machine Rooms will be provided with separate dedicated split DX systems.

Table 6 shows a summary of the options considered in a separate LCCA for the envelope and HVAC system replacements for Building 1560. Perform 40-year LCCAs to confirm the results of the separate LCCA or to provide alternate option(s).

Windows and Lighting LCCAs Baseline (Existing) Option 1A Option 1B Option 1C

Existing HVAC Existing HVAC Existing HVAC Existing HVAC Existing Windows Existing Windows Improved Windows Improved Windows Existing Lighting Improved Lighting Existing Lighting Improved Lighting

Building HVAC LCCAs with ASHRAE envelope values Existing ASHRAE Baseline System #5

Building Heating Hot Water System 80% Eff. Boilers 80% Eff. Boilers

(2) CV Pumps (2) VV Pumps

Gas Gas Building Chilled Water System

(1) 10.2 EER, Air-Cooled Chiller (3) Packaged DX Rooftop w/ Heating Water N/A N/A

Ventilation DOAS 1st, 2nd Via (3) Rooftop Units

DX Cooling, Elec. Heat N/A No ERW No ERW

Office Area HVAC 2-Pipe FCUs VAV boxes w/reheat

Option 2A – Air Cooled Chiller Option 2B – Split DX Option 2C – Packaged RTU Building Heating Hot Water System

80% Eff. Boilers 80% Eff. Boilers 80% Eff. Boilers

(2) VV Pumps (2) VV Pumps (2) VV Pumps

Gas Gas Gas Building Chilled Water System

(1) 10.1 FL EER, Air-Cooled Chiller (3) Split DX w/Heating Water (3) Packaged DX Rooftop w/Heating Water

(2) VV Pumps N/A N/A Ventilation

DOAS 1st, 2nd, 3rd DOAS 1st, 2nd, 3rd DOAS 1st, 2nd, 3rd Chilled & Heating Water Packaged DX & Heating Water Packaged DX & Heating Water

(1) 50% Eff. ERW (1) 50% Eff. ERW (1) 50% Eff. ERW Office Area HVAC

4-Pipe FCUs Constant Volume Constant Volume Table 6. LCCA Options

Abbreviations CV - Constant Volume DOAS – Dedicated Outside Air System DX – Direct Expansion EER – Energy Efficiency Ratio ERW – Energy Recovery Wheel FCU – Fan Coil Unit FL – Full Load PTAC – Packaged Thru Wall Air Conditioner RTU – Rooftop Unit VV – Variable Volume

In addition to replacing the HVAC systems serving the occupied spaces, the basement mechanical room exhaust fan will be replaced. The exhaust ductwork and grilles extended from the toilet exhaust systems on 3rd floor will be demolished; the ductwork will be patched where the connection was made and the system will be rebalanced.

Controls will be DDC controls. Connection to the building or the campus control or monitoring capabilities is anticipated.

Due to the complicated nature of the mechanical work, commissioning of the installed systems is anticipated. Testing, adjusting and balancing (TAB) is anticipated.

Anticipated additional design and construction items related to the secure nature of this facility, in accordance with UFC-4-010-05 Sensitive Compartmented Information Facilities Planning, Design, and Construction, with Change 1, are:

a. Mechanical system refrigerant lines will be grounded within 6 inches of the perimeter penetration using a no. 4 wire to the building ground. The integrity of refrigerant line insulation will be maintained.

b. HVAC ducts will be provided with a nonconductive break (flex connection) using material appropriate for the climate, for a 2- to 6-inch section of the duct inside the SCIF perimeter adjacent to the penetration.

c. All vents or duct openings exceeding 96 square inches that penetrate the perimeter will be protected with permanently affixed bars, grills, metal sound baffles or wave forms. If one dimension of the penetration measures less than 6 inches, protection is not required. For vents or ducts that require bars or grill, an accessible access panel in the bottom within the perimeter of the SCIF to allow visual inspection of the bars, grill or waveguide-below-cutoff RF filter will be provided.

The building will be occupied during construction. Equipment replacements and piping installation will be coordinated to allow service to continue through most of the building while portions are renovated. Shutdowns and new connections will require coordination and probable off hour work.

H. Fire Protection/Life Safety

Per UFC 3-600-01, a fire protection design analysis is required for major projects and must address the fire protection requirements of the project as required by this UFC. This design analysis summarizes fire protection features that are required versus features that are provided.

References:

• International Building Code (IBC), for fire resistance requirements and area limitations as referenced by UFC 3-600-01

• NFPA 10 Standard for Portable Fire Extinguishers

• NFPA 13 Installation of Sprinkler Systems

• NFPA 70 National Electrical Code

• NFPA 72 National Fire Alarm Code

• NFPA 80 Standard for Fire Door and Other Opening Protectives

• NFPA 101 Life Safety Code, for exit facilities and means of egress as referenced by UFC 3-600-01

• UFC 3-600-01, Fire Protection Engineering For Facilities

• UFC 4-010-01, DoD Minimum Antiterrorism Standards for Buildings

The Joint Base Andrews Fire Protection Standards shall be referenced in the Design\Build RFP package. The Design\Build Contractor will be required to comply with current Base Standards, to the extent they are applicable to this projects’ work scope.

Work on this project is generally defined as ‘modification’ and ‘reconstruction’ work per UFC 3- 600-01, Chapter 34. Therefore, work must conform to the requirements for ‘new construction in UFC and NFPA 101.

Comply with UFC 3-600-01, Chapter 34, for phasing of construction and coordination of fire protection and life safety features during construction:

• Phasing of construction and demolition operations must be planned so that the integrity of fire-rated separations, smoke-tight boundaries, means of egress, exit enclosures, and vertical openings are maintained to the highest level possible.

• The phasing plan must ensure that obstruction of the means of egress is avoided or minimized.

• If exits are obstructed during construction, provide alternate means of egress and exit routes during each phase of construction and identify the alternate routes on the construction drawings as part of the phasing plan(s).

• Minimize, to the extent possible, any impairments or disruptions to active fire protection features. Delineate phasing of construction to ensure that installations of new features (or systems) or modifications to existing ones are expedited.

• Where possible, maintain existing systems in service until the replacement work has been deemed operational.

• Prior to taking any actions to impair a fire protection feature or disrupt its performance, ensure alternative procedures have been prepared and incorporated and confirm that official notification of system impairments and schedules have been given to the staff of the Facility.

1. Building Code Analysis, Occupancy Classification

Occupancy Classification \ Building Construction Type

Use Group Existing to Remain - Business Group B (IBC).

Minimum Construction Type

Type II-B (Existing To Remain)

For reference, the equivalent NFPA 101 construction type for this project is Type II (000):

Exterior Bearing walls: 0-hr FRR, Interior Bearing:

0-hr FRR, Floor: 0-hr FRR, Roof: 0-hr FRR.

Area and Height Limitations

Allowable Floor Area At = 69,000 sq.ft. (IBC, Table 506.2)

Actual Area Approximately 9,000 sq.ft. per floor (three floors)

Height Limitation 75 feet or 4 Stories

Fire Resistive Substitution

N/A

Occupancy Separations N/A

Fire Resistive Requirements

IBC Table 601

Exterior Walls 0 hour

Interior Bearing Walls 0 hour

Structural Frame 0 hour

Permanent Partitions 0 hour

Floors & Floor-Ceilings 0 hour

Roofs & Roof-Ceiling

Vertical Shafts

0 hour

1 hour

Fire Blocks & Draft Stops Not required in non-combustible construction (Reference IBC, Section 718)

Hazard Classification For determining automatic sprinkler densities and hose stream demands per UFC 3-600-01, NFPA 13, and as shown on drawings. Occupancy classification is considered “ordinary” as defined by NFPA 101.

Automatic Sprinklers & Other Extinguishing Equipment

Automatic Sprinklers (existing) are provided throughout the facility in accordance with UFC 3- 600-01 and NFPA 13 (See automatic suppression system section below for complete description)

Portable Fire Extinguishers No extinguishers will be installed in the storage and office areas (not required, per UFC, for a fully sprinklered facility). Existing portable fire extinguishers are to remain as-is.

Detection Alarm & Communication

Per UFC 3-600-01 and NFPA 72

Fire & Smoke Dampers NFPA 90A and UFC 3-600-01

Interior Finish Requirements

Egress Corridors Class A or Class B Interior Finish Materials, NFPA101 Section 10.2

Typical Class I or II, NFPA 101, Section 10.1

Means of Egress Separation of Means of Egress

Separation of Means of Egress as required by NFPA 101. For a new Business occupancy, fully sprinklered, corridor separation is not required.

Illumination of Means of Egress

Illuminated emergency lighting powered through battery packs will be located as required by NFPA 101.

Marking of Means of Egress

All exits and passageways leading to an exit will have LED (Light Emitting Diode) illuminated emergency exit signs (NFPA 101 Section 7.10, and

UFC 3-600-01).

Occupant Load

Occupant Load Factor & Egress Capacity

Business – 100 sq.ft. per person Storage – 500 sq.ft. per person

Occupant load is existing. Scope of work does not affect existing occupant loads.

Number of Means of Egress

Minimum Number of Exits

Minimum Two (2) Required (Per NFPA 101)

Actual Number of Exits Three (3) exits

Exit Configuration \ Travel Distances

Dead End Limits

NFPA 101

Business - 300 ft (sprinklered)

Common Length of Travel

Business - 100 ft (sprinklered)

Length of Travel Distance

Business - 50 ft (sprinklered)

2. Compliance with UFC 3-600-01 and National Fire Codes

As part of the design document preparation, the designer-of-record for each individual system is to ensure compliance with UFC 3-600-01 and the applicable National Fire Codes.

3. Analysis of Automatic Sprinkler Systems and Suppression Systems and Protected Areas, including Hydraulic Analysis of Required Water Demand

The building is equipped with an existing wet-pipe automatic fire sprinkler system. The system will be modified, as required, to meet the requirements of the project work scope, UFC, and applicable NFPA standards.

The basic description of the wet-pipe fire sprinkler the system operation is as follows:

Automatic sprinklers are attached to piping containing water and that is connected to water supply. Water discharges immediately from sprinklers when they are opened.

Sprinklers open when heat melts a fusible link or destroys frangible bulb device (depending on the specific sprinkler head type). Upon water flow (after an allowable set retard period) the flow switch installed in the system riser/zone will initiate an alarm on the building fire alarm panel.

New automatic fire sprinklers shall be of the Quick Response (QR) type. Temperature ratings shall be consistent with the environment that the head is installed, per the requirements of NFPA 13. The majority of the heads utilized on this project will be 155°F considering the renovation occurs in climate-controlled areas.

The fire protection water supply for this buildings fire sprinkler system is existing, to remain as-is.

The aboveground fire sprinkler system shall be hydraulically designed to meet the requirements of UFC 3-600-01, which includes the following for this facility:

a. Office Areas, Corridors, Restrooms, and similar spaces: Light Hazard Occupancy with a design density of 0.10 gpm/sf over the hydraulically most remote 1,500 sf area, with an outside hose allowance of 250 gpm. The occupancy hazard classification chosen for these areas is consistent with the description of similar areas provided in

UFC 3-600-01.

b. Mechanical Rooms, Electrical Rooms, Small Storage Rooms\Closets, and similar spaces: Ordinary Hazard Occupancy with a design density of 0.20 gpm/sf over the hydraulically most remote 2,500 sf area, with an outside hose allowance of 250 gpm.

The occupancy hazard classification chosen for these areas is consistent with the description of similar areas provided in UFC 3-600-01.

Modifications to aboveground piping systems will require system pressure testing in accordance with NFPA 13. Drain piping, downstream of drain valves, does not require pressure testing.

All fire protection devices shall be UL Listed / Approved for the intended use.

4. Water Supplies, Water Distribution, Location of Fire Hydrants

The fire protection water supply feeding this facility is existing to remain as-is. The scope of work on this project does not require hydraulic calculation of the existing fire sprinkler system.

5. Smoke Control Methods and Smoke Control Systems

No active smoke control systems are required for this occupancy. Penetrations in floors shall be sealed to limit the transfer of smoke (at a minimum). If a floor fire rating is required, the penetration shall be rated to match.

6. Fire Alarm System and Connection to the Base Fire Alarm Reporting System

The existing fire alarm system in this building shall remain as-is and shall be modified to coordinate with the scope of work on the project. The existing fire alarm system is a Notifier AFP-400 system.

All software, software locks, special tools and other proprietary equipment required to maintain, add devices to or delete devices from the system or test the system will be furnished to the Government prior to final inspections of the system.

All new fire alarm system wire shall be located in dedicated conduit.

The fire alarm system will be activated by the initiation of the following primary means.

a. Automatic sprinkler water flow switch(s). Existing to remain as-is.

b. Manual pull station, located at each of the indicated required exits. Existing to remain as-is.

c. Detection of smoke particles by the smoke detectors.

d. Detection of heat that exceeds the set temperature level set for either the rate of rise method, or thru a fixed temperature point.

Duct smoke detectors located in the HVAC system upon activation shall shutdown all of the facilities air handler units, initiate an ‘alarm’ signal on the FACP for building evacuation, and transmit an alarm signal to the local Central Dispatch (central monitoring station).

Manual pull stations at exits are existing to remain.

Occupant notification by the fire alarm system will be performed through the facility by visual and audible notification until the system is reset or acknowledged at the main fire alarm control panel or remote annunciator.

All visual notification devices will be synchronized as per ABA requirements. Audible notification will be performed with the horns that are integrated into the fire alarm visual notification device.

Upon detection of any fire alarm system alarm or trouble, the fire alarm panel connected to the fire alarm transmitter will transmit the indicated system signal to the local authorities having jurisdiction.

The run time of the fire alarm system, mass notification system, and the fire alarm transmitter, on batteries is designed to perform for 15 minutes of alarm, with a standby of 48 hours after loss of primary power.

7. Mass Notification System

There is no existing Mass Notification System in this facility (Building 1560). The current scope of work does not include the installation of a mass notification system.

8. Standpipe Systems and Portable Fire Extinguishers

Considering the height and size of the building, a standpipe system (NFPA 14) is not required.

Per UFC 3-600-01 portable fire extinguishers will not be required on this project due to the building being fully sprinklered and being provided with a fire alarm system.

9. Coordination with Security and Antiterrorism Requirements

Each system (including architectural, mechanical, electrical, plumbing, fire protection, etc.) shall be coordinated with the anti-terrorism requirements and recommendations of UFC 4-010-01. It will be the responsibility of the designer-of-record for each system to incorporate antiterrorism requirements.

Security features that interface with means of egress components (i.e. exit doors) of the building shall meet the requirements of NFPA 101. Egress access shall be available to all occupants of the building while occupied.

10. Fire Protection During Construction

Construction activities shall consider and incorporate the recommendations of NFPA 241

- “Standard for Safeguarding Construction, Alteration, and Demolition Operations”.

The existing fire alarm shall be maintained in service, to the extent possible, during renovation activities. If fire protection systems are removed from service a Fire Watch shall be provided by the Contractor.

Base fire department Hot Work permit requirements shall be obtained prior to any Hot Work activities. A Hot Work permit is required for any temporary operation involving open flames or producing heat and/or sparks. This includes, but is not limited to: Brazing, Grinding, Soldering, Thawing Pipe, Torch Applied Roofing and Welding.

11. Fire Department Access

Fire Department vehicular access routes serving this building\site are existing, to remain as-is.

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