Exhibit N - LR and NLR VAMCs Preliminary Assessment Report.pdf

Preliminary Assessment (PA) at the

U.S. Department of Veterans Affairs North Little Rock VAMC

2200 Fort Roots Drive, North Little Rock, AR 72114 Little Rock VAMC

4300 West 7th Street, Little Rock, AR 72205

A PROPOSAL In Accordance with Request for Proposal VA701-17-R-0072

SUBMITTED TO

U.S. Department of Veterans Affairs

PROPOSAL SUBMITTED BY

TLS – CES Services I, LLC 4733 Kibler Road

Van Buren, AR 72956

Date: April 30, 2018

36C25622Q1188 0001 Exhibit N

Table of Contents

Project Overview

Executive Summary

Site Information

Utility Data and Analysis

Technical Assessment

ECM Descriptions – North Little Rock VAMC

ECM Descriptions – Little Rock VAMC

Risk, Responsibility, and Performance Matrix

Project Schedule

Management Approach

Project Management Overview

Organization

Roles and Responsibilities

ECM Installation Activities

Subcontracting Plan

M&V and Commissioning Overview & Approach

Commissioning

Training

Operations and Maintenance Training

Measurement and Verification (M&V) Approach

Financial Assessment, TO Schedules

Basic Summary Schedule

Annual Escalation

TO-1 Preliminary Assessment Cost Savings and Payments

TO-2a Implementation Cost by ECM

TO-2a Implementation Price by ECM (cont’d)

TO-2b Project Implementation Price Worksheet

TO-3 Post Acceptance Performance Period Cash Flow

TO-3 Post Acceptance Performance Period Cash Flow (cont’d)

TO-4 First Year Estimated Cost Savings by ECM and TC

Appendix J-13

Project Overview Executive Summary TLS-CES Services I, LLC (TLS-CES) are pleased to submit this Preliminary Assessment (PA) of proposed Energy Conservation Measures (ECMs).

The scope of work of this report includes the following VA facilities:

• North Little Rock VA Medical Center (2200 Fort Roots Drive, North Little Rock, AR 72114)

• Little Rock VA Medical Center (4300 West 7th Street, Little Rock, AR 72205)

TLS-CES included the ECMs outlined by the VA for each site within this PA report as well as additional opportunities identified during the process. The ECM project implementation costs identified in this report total approximately $72M with approximately $2.7M potential annual cost savings. However, the total values include mutually exclusive measures that will result in lower contracted values. It is anticipated that the VISN will choose the most attractive and feasible options for full project development during the Investment Grade Audit. Not only can this project save energy, but it will repair and upgrade critical HVAC infrastructure that will ensure the facilities will be positioned for future upgrades.

This PA presents a comprehensive package of ECMs at both facilities. Some highlights of the measures include:

• At North Little Rock VAMC, mutually exclusive boiler project options are included to either upgrade or convert the existing steam supply system with hot water. The upgrade projects include the addition of thermostatic valves to radiators throughout the site and the replacement of steam boiler burners and addition of burner management at the existing boilers. The other direction involves conversion from steam heating to hot water heating across the entire campus and includes a feasibility study in the IGA phase.

Replacing the steam to heating hot water heat exchangers in Building 170 with a new condensing hot water plant is also offered as an option to reduce steam demands from the existing infrastructure.

• At Little Rock VAMC, boiler projects include replacement of steam to heating hot water heat exchangers with a new condensing hot water plant and replacement of steam boiler burners, addition of burner management and a stack economizer at the existing boilers.

• Upgrades to the chilled water plant at the North Little Rock VAMC include installation of one (1) 910-ton high efficiency chiller with VFD, installation of one (1) new cooling tower with VFD, installation of one (1) new primary chilled water pump, one (1) new condenser water pump, and new plant optimization controls. A separate ECM replaces the 165-ton air-cooled chiller to address Data Center cooling issues.

• Upgrades to the chilled water plant at the Little Rock VAMC include the installation of one (1) 1,400-ton high efficiency chiller with VFD, (1) 900-ton high efficiency chiller with VFD, installation of new increased capacity cooling towers with VFDs, installation of all new increased capacity chilled water and condenser water pumps, and new plant optimization controls.

• Upgrades to the controls to provide unoccupied set back thermostat set points in Buildings 5 and 102 at North Little Rock VAMC.

• Repairs to the existing advanced metering systems and integrating them locally with and without continuous commissioning are mutually exclusive options offered at both sites.

• Ducting return air to AHU-27 at Little Rock VAMC can reduce some of the outside air load.

• Retrofit, re-lamp or replace fluorescent, HID and incandescent interior and exterior fixtures with LED luminaires at both North Little Rock VAMC and interior fixtures at Little Rock VAMC.

• Building envelope upgrades include weather stripping in 48 buildings across both sites, attic insulation in eight (8) buildings and window film in four (4) buildings at North Little Rock VAMC.

• Replace failed steam traps and repair steam monitoring at both sites.

• Provide insulation, where missing or damaged, for steam piping systems at both sites.

• At North Little Rock VAMC, a combined heat and power plant would consist of a natural gas driven turbine or engine/generator set to produce electricity with waste heat recovery to offset steam production from the natural gas boilers.

• At North Little Rock VAMC, a carport mounted solar photovoltaic system installed in the parking lot and ground mounted solar photovoltaic options would offset purchased power costs.

• Replacement of the secondary transformers with more efficient units at both sites.

• Upgrade plumbing fixtures to lower consumption units at both sites.

• Install 100% back-up power including a fourth generator at the Little Rock VAMC to allow the facility to take advantage of the Optional Interruptible Service Rider offered by Entergy Arkansas, Inc.

• Retrofit air compressors at Little Rock VAMC to prevent use of domestic water for cooling.

See the table below that summarizes energy and water savings by ECM.

TLS-CES has prepared a project development and implementation schedule that includes the development and construction of all VA identified ECMs. The project schedule allows for a 12 month development period and a 32 month construction period. Proposed schedule milestones:

• Investment Grade Audit NOITA: 5/31/18

• 30% IGA Submission: 9/6/18

• 60% IGA Submission: 11/21/18

• 95% IGA Submission: 2/19/19

• Final IGA Submission: 5/23/19

• Contract Award: 6/21/19

• Final Project Acceptance: 2/18/19

The full project schedule can be found following the ECM Descriptions.

Electric Savings

Natural gas savings

Total energy cost savings Water savings

O&M cost savings

Estimated annual cost savings

($/yr) ($/yr) ($/yr) ($/yr) ($/yr) ($/yr)

NLR.1.01 Heating Hot Water $0 $16,530 $16,530 $14,521 $0 $31,051 NLR.1.02 Thermostatic Valves $0 $2,182 $2,182 $0 $0 $2,182 NLR.1.03 Decentralization $0 $165,169 $165,169 $29,699 $0 $194,868 NLR.1.04 Boiler Burners and Burner Management $0 $95,102 $95,102 $0 $0 $95,102 NLR.2.01 Upgrade Chil ler Plant -$3,520 $0 -$3,520 $0 $0 -$3,520 NLR.3.01 Programmable Thermostat $520 $0 $520 $0 $0 $520

NLR.3.02 Upgrade Building Automation System $113 $345 $458 $0 $0 $458

NLR.3.03 Advanced Metering & Continuous Commissioning $80,520 $0 $80,520 $0 $0 $80,520

NLR.3.04 Advanced Metering Recommissioning $0 $0 $0 $0 $0 $0 NLR.5.01 Interior Lighting $277,294 -$52,411 $224,883 $0 $26,642 $251,525 NLR.5.02 Exterior Lighting $14,250 $0 $14,250 $0 $0 $14,250 NLR.6.01 Attic Insulation $2,567 $225 $2,792 $0 $0 $2,792 NLR.6.02 Window Film $22,051 $0 $22,051 $0 $0 $22,051 NLR.6.03 Weatherization $2,475 $2,803 $5,278 $0 $0 $5,278 NLR.7.01 Steam Traps $0 $50,342 $50,342 $0 $0 $50,342 NLR.7.02 Steam Piping Insulation $0 $123,119 $123,119 $0 $0 $123,119

NLR.10.01 CHP Plant $969,918 -$335,203 $634,715 $5,481 $1,655 $641,851 NLR.11.01 Carport Mount Solar Photovoltaics $74,962 $0 $74,962 $0 $0 $74,962 NLR.11.02 Ground Mount Solar Photovoltaics $74,962 $0 $74,962 $0 $0 $74,962 NLR.12.01 High Efficiency Transformers $40,202 $0 $40,202 $0 $0 $40,202 NLR.13.01 Plumbing Fixtures $524 $2,086 $2,610 $35,869 $0 $38,479 NLR.20.01 Data Center $17,756 $0 $17,756 $0 $0 $17,756

LR.1.01 Heating Hot Water $0 $4,167 $4,167 $0 $0 $4,167 LR.1.02 Boilers (Stack Economizers, Burners & Burner Management) $0 $51,329 $51,329 $0 $0 $51,329 LR.2.01 Upgrade Chil ler Plant -$26,536 $0 -$26,536 $0 $0 -$26,536 LR.3.01 Advanced Metering & Continuous Commissioning $80,520 $0 $80,520 $0 $0 $80,520 LR.3.02 Advanced Metering Recommissioning $0 $0 $0 $0 $0 $0 LR.4.01 Retrofit AHU-27 $1,439 $426 $1,865 $0 $0 $1,865 LR.5.01 Interior Lighting $283,591 -$81,289 $202,302 $0 $26,313 $228,615 LR.5.02 Exterior Lighting $0 $0 $0 $0 $0 $0 LR.6.01 Weatherization $74 $143 $217 $0 $0 $217 LR.7.01 Steam Traps $0 $76,093 $76,093 $0 $0 $76,093 LR.7.02 Steam Piping Insulation $0 $42,526 $42,526 $0 $0 $42,526

LR.10.01 CHP Plant $0 $0 $0 $0 $0 $0 LR.12.01 High Efficiency Transformers $24,570 $0 $24,570 $0 $0 $24,570 LR.12.02 Power Factor $4,546 $0 $4,546 $0 $0 $4,546 LR.13.01 Plumbing Fixtures $0 $1,030 $1,030 $21,740 $0 $22,770 LR.15.01 Interruptible Rider (100% Stand-by) $556,922 $0 $509,447 $0 $0 $506,751 LR.20.01 Upgrade Air Compressors -$4,194 $0 -$4,194 $112,503 $0 $108,308

TOTALS $2,495,527 $164,712 $2,612,764 $219,813 $54,611 $2,884,491

ECM No. ECM Description - Title

Site Information

The North Little Rock VA Medical Center is an approximately 1,500,000 square foot campus style medical facility with ninety (90) total structures on approximately 188 acres located in North Little Rock, Arkansas. The site, along the Arkansas River, was originally developed in 1893 by the US Army as Fort Logan H. Roots military training facility with its first buildings completed in 1896. This facility was transferred to become a Veterans’ hospital in 1921 and has been listed on the National Register of Historic Places since 1974 with fifty-six (56) buildings identified as historic.

Two subsequent major periods of development on campus include the stucco faced buildings constructed in the 1920s and the red brick faced buildings built between the mid-1930s and mid-1940s. Typical windows are aluminum frame or wood frame with double glazing. The four-story Eugene J. Towbin Healthcare Center was completed in 1983 as the main hospital building. With 356 operating beds, the campus houses a 119-bed Domiciliary Residential Rehabilitation Treatment Unit and a 152-bed community living center. The Veterans’ Administration’s Law Enforcement Training Center, built in 1995, has administrative, training and lodging space on the campus as well.

The grounds include a fitness center and trail, softball field, tennis, volleyball and basketball courts and a partial former golf course. Many other buildings and structures on the campus have been added incrementally over the last 60 years to provide support services for the main hospital and grounds. The campus is classified as a moderate -high region of seismicity for design. There is still a presence of asbestos and lead remaining in multiple older buildings and infrastructure on site. Another age related construction issue is the presence of cloth covered rubber insulation on some of the original power wiring.

The City of North Little Rock provides electric and wastewater utility services for the site. Water service is purchased from Central Arkansas Water through Utility Billing Services. The natural gas utility service is provided by Constellation Gas.

Steam is generated for the site in the Building 69 boiler plant with three (3) Superior Boiler brand fire tube boilers with flue gas economizers. Each 750 BHP boiler has a capacity of 25,268 pounds per hour of steam. Summer use is limited to one (1) boiler, and a second boiler is activated, as required, for increased loads during the winter months.

The third unit is for installed redundant capacity. General hospital uses of sterilization, space heating and domestic hot water heating require a steam set point of 70 psi. The boilers can burn either natural gas or fuel oil #2, but natural gas is the typical fuel consumed. Steam and condensate are distributed below grade with an extensive network of piping woven throughout the campus. Due to the age of the piping system, the site is experiencing significant issues with excessive make-up water and water quality. Steam is used in steam heating coils directly for outside air preheating and radiator heating as well as process loads, but many buildings also have heat exchangers to convert steam energy to heating hot water. Laundry processing (bldg. 159) was recently taken off the central plant with local steam generation.

The central chilled water plant is in the basement of Building 170 with three (3) water-cooled chillers delivering water to the facility in a primary, secondary pumping arrangement. Chillers 1 and 2 are 910 tons each, and Chiller 3 has 410 tons of capacity. Three (3) cooling towers and dedicated condenser water pumps have been recently replaced.

The fans have variable frequency drives to control the condenser water supply temperature. The condenser water pumps have variable speed drives, but they have been set to a constant speed. Three (3) primary pumps serve Chillers 1 and 2, with one being a stand-by unit. Chiller 3 has a single primary pump. Two (2) variable speed secondary pumps serve a loop to Buildings 66 and 170. One (1) variable speed tertiary pump serves Buildings 76, 89 and 102, while another serves Building 159. Chillers are enabled when outside air temperature exceeds 50°F, and chilled water temperature is reset with outside air temperature. All three (3) chillers are required to run to meet peak loads. Other buildings on the site have local cooling capacity through either air-cooled chillers or direct expansion (DX) cooling.

The primary building automation system is by Siemens with three (3) Apogee Insight workstations at the site. It serves twenty-six (26) buildings. Another Siemens Apogee workstation provides control to Buildings 65 and 111 exclusively.

Water is supplied to the site with a 500,000 gallon reservoir along the river metered and pumped up to a distribution loop to serve the campus. Two (2) water towers with a total capacity of 400,000 gallons boost the local water pressure. The 150,000 gallon tower was built in 1911 and is registered as a historic structure.

The campus has installed carports with solar photovoltaic panels in three (3) major parking areas to offset energy use.

Fifty-five (55) buildings on site are identified with HVAC systems. The combined area of these buildings is over 1,410,000 square feet of the total building area on site. See the following building descriptions for additional information on these systems.

Building 1:

The Engineering Administration office building was originally the Enlisted Barracks in 1896 and totals 24,061 square feet on four (4) floors. This registered historic building has a brick façade and pitched, shingled and metal roofs. A dedicated air-cooled chiller provides chilled water to a single variable air volume air handling unit with hot water reheat. The chiller and pump are only enabled when the outside air temperature exceeds 55°F. Two (2) heating hot water converters are used to convert the 15 psi steam supply to a hot water supply temperature set point. The hot water loop is supplied by a primary pump with an installed spare.

Building 2:

The Engineering Information Resource Management office is located in this 1896 building that formerly housed the Mess Hall. The red brick building has 2,036 square feet and a pitched roof with shingles. It is a registered historic building served by six Liebert ductless split system units.

Building 3:

The Engineering IT office is in the former Kitchen building constructed in 1896. It has a red brick façade with a pitched, shingled roof and occupies 1,149 square feet. A packaged unit serves the registered historic building.

Building 4:

Engineering Storage is located in the former Mess Hall constructed in 1896. With a red brick façade and a pitched roof with shingles, this registered historic building encompasses 2,038 square feet. The building has heating only with steam heating units.

Building 5:

The Regional Council office is a 5,145 square foot building, constructed in 1896, that was the former Guard House and is on the historic registry. It has a pitched roof with shingles and brick exterior walls. The air conditioning system is a split system DX unit.

Building 6:

This building houses the Firemen’s Dormitory of 1,411 square feet. It was built in 1896 as the Work Shop with a brick façade and pitched roof with shingles. This building is registered as a historic structure. A 5-ton split system DX unit with steam preheat provides conditioning for the building.

Building 7:

The Storage building has 10,944 square feet constructed in 1896 with brick and a pitched, slate roof. The registered historic building is conditioned by two (2) Trane air handling units, a steam radiator and several window air conditioners.

Building 8:

The Law Enforcement Training Center is a historic building, constructed in 1896 as the Stable, with 7,141 square feet. The roof is pitched with shingles, and the exterior walls are red brick. It is served by a packaged heat pump.

Building 11:

The Little Rock Employee Education Resource Center for the main hospital is 4,999 square feet over two (2) floors built in 1896. The roof is pitched with shingles and metal while the exterior walls are brick faced. Each floor of the historic building is conditioned by a split system DX air handling unit with a steam preheating coil and economizer dampers. The compressor cycles when the outside air temperature exceeds 60°F and the steam modulates for 70°F or below outside air temperature. The unit runs in economizer mode when outside air is between 45°F and 72°F.

Buildings 12, 13 and 14:

Each of these historic buildings measure 10,084 square feet and are used for Duplex Quarters. They were constructed in 1896 with three (3) stories, red brick facades and pitched roofs. Both shingle and metal roofing are installed. There are fourteen (14) steam radiators in each building and a few window air conditioning units. Building 12 is reported as unoccupied while Buildings 13 and 14 have 50% occupancy.

Building 15:

This 4,910 square foot housing building is designated as Single Quarters, constructed in 1896 with red brick walls and a pitched roof with shingles and metal roofing. The two (2) story building is listed on the historic registry and has seven (7) steam radiators for heating.

Building 16:

Engineering Transportation is located in the former Work Shop of 1896 and measures 1,411 square feet. The historic registered building has a red brick façade and a pitched roof with shingles. A split system DX unit conditions the building.

Building 22:

The Fire Station is located in a 2,297 square foot, single story building constructed in 1901 and is on the historic registry. It has a red brick exterior with pitched and flat roofing. The building is listed on the historic registry and is heated with steam.

Building 24:

This historic building measures 7,959 square feet and is used for Duplex Quarters. It was constructed in 1898 with three (3) stories, brick and wood facades and pitched roofs. Both shingle and metal roofing are installed. There are fourteen (14) steam radiators and a few window air conditioning units. This building is reported as being unoccupied.

Building 26:

The Engineering and Maintenance Shop building is 13,594 square feet and was constructed in 1922. It has a stucco façade with a flat roof in poor condition. Cooling for the building is provided by split system DX units, packaged terminal air conditioners and window air conditioners. Six (6) steam radiators heat the building.

Building 32:

The Fiscal office was the Post Headquarters in 1905 and is registered as historic. The brick building is 4,806 square feet under a pitched roof with shingles. Two (2) split system DX units with steam reheat serve the building.

Building 33:

The Human Resources office building, constructed in 1896, is 7,071 square feet over two (2) floors. The exterior walls are brick faced, and the roof is pitched with shingles. The historic building has a split system DX unit. The office and conference room have dedicated packaged units. The conference unit is relatively new with steam reheat.

Building 34:

The Little Rock Employee Education Resource Center occupies this 13,161 square foot building of three (3) floors.

This historic registered building was built in 1906 as an Enlisted Barracks with a brick façade. The roof is pitched with shingles and metal roofing. It is served by a split system DX unit and window air conditioning.

Building 35:

The Telephone Switch building is a 1,299 square foot, two (2) room structure that was originally the Kitchen in 1907.

It has been included in the historic registry. This brick faced building has a pitched shingled roof. Each room is conditioned with a chilled water air handling unit with steam heating. Steam dehumidifiers have been disconnected.

Building 36:

This historic building houses Human Resources offices and was built in 1907 with 3,714 square feet over two (2) floors. The roof is pitched with shingles, and the exterior façade is red brick. A split system DX unit with hot water heating conditions the building. The heating hot water is supplied from Building 37.

Building 37:

The Human Resources building is a three (3) story, 12,628 square foot building constructed in 1907. This historic registered building has a pitched roof with shingles and a red brick façade. There are four (4) split system DX units serving this building. These systems also have heating hot water that is generated from the heat exchangers in the basement.

Building 38:

This building is identified as part of the Little Rock Employee Education Resource Center and is listed on the historic register. Built in 1907 with 1,584 square feet, it has a red brick exterior and a pitched roof with shingles. The building is conditioned by a split system DX heat pump with steam reheating.

Building 39:

The Residential Rehabilitation Treatment Program is located in this two (2) story building, constructed in 1907, that’s 4,495 square feet. The exterior façade is red brick, and the pitched roof has shingles and metal roofing. This building is listed on the historic register. A split system DX unit with steam heating serves the building. It has seven (7) beds for transitional housing used by Mental Health Services.

Building 40:

This historic building measures 8,331 square feet and is used as the Director’s Quarters. It was constructed in 1907 with three (3) stories, red brick facades and pitched roofs. Both shingle and metal roofing are installed. There are ten

(10) steam radiators and a few window air conditioning units.

Building 41:

The Fiscal / A&MMS building was constructed with three (3) floors in 1907 and is 17,923 square feet. The roof is pitched with singles, and the exterior walls are red brick. This building was formerly the Officer’s Quarters and is listed as a historic building. Five (5) split system DX units with steam heating coils and a computer room air conditioner with electric heat condition the building.

Building 58:

HS Research and Development, Little Rock Employee Education Resource Center and the VISN Director share the five (5) story, 44,083 square foot building constructed in 1931. The façade is brick, and roof has a combination of pitched roof with shingles and flat roof. The flat roof areas appear to have a TPO cool roof installed. The building is listed in the historic register. Four (4) packaged DX units and two (2) split system DX units condition the building. The packaged DX unit has steam heating and an air economizer. The original steam radiators are scheduled for renovation. Over 50% of the building is unoccupied.

Building 65:

The Veterans Benefits Administration office is located in this historic building totaling 48,853 square feet. It was built in 1936 with four (4) floors, a pitched roof with singles and a brick façade. Conditioned air is provided by fifty (50) 4-pipe fan coil units in the ceiling space. The chilled water for these units is produced locally by a 140-ton air cooled chiller with two (2) primary pumps. Preconditioned outside air is ducted directly into spaces from a chilled water modular air handling unit with hot water heating and a heat recovery enthalpy wheel. All of this HVAC equipment is only 4 years old. The server room has a dedicated Liebert computer room air conditioner. This facility served 22,536 visitors last year.

Building 66:

This Outpatient and Support building was constructed in 1944 with 59,716 square feet over four (4) floors. This historic building has a pitched roof with shingles and a red brick façade. Six (6) air handling units are chilled water units with steam pre-heat coils and hot water reheat. The secondary chilled water loop pumps are located in this building and stage on based on the outside air temperature. Two (2) heating hot water pumps are also staged with outside air temperature to produce hot water from the converter in the building. Additional perimeter heating is provided with four (4) steam radiators on the ground floor. Outpatient visits total approximately 75,000 annually.

Building 68:

The four (4) story, 55,939 square foot building constructed in 1944 contains Daycare and Education functions and is listed on the historic register. The building has a red faced brick façade and has a pitched and shingled roof. Two (2) air-cooled chillers with two (2) pumps supply chilled water to a combination of air handling units and 2-pipe fan coil units. The ground and first floors have fan coil units with an outside air unit. The second floor has a variable air volume air handling unit with terminal hot water heating. There are three (3) constant volume air handlers with steam preheat and reheat. A dedicated air handling unit serves the assembly area. Additionally, there is a 7.5-ton packaged DX unit. Twenty-two (22) steam radiators were designed to provide supplemental perimeter heating, but only fifteen

(15) are in use. The chillers and pumps are only enabled when the outside air temperature exceeds 60°F. Heating hot water is delivered from the two (2) steam converters and pumps at this building. Additionally, there is a 7.5-ton packaged unit. Most existing controls in the building are pneumatic.

Building 69:

The Boiler Plant is located in a two (2) story, 6,590 square foot building constructed in 1936. The building has a red brick façade and a flat built up roof. It houses the three (3) boilers previously described in the site information section.

The historic building is served by a heating and ventilating unit.

Building 76:

Nutrition and Food services are provided in the 45,234 square foot building, constructed in 1936 with two (2) stories.

The exterior walls are red brick, and the roof has both pitched and flat sections. The pitched roofs have shingles, and the flat roof is built-up roofing. This building is listed as a historic structure. Four (4) chilled water air handling units with hot water reheat are located on the roof of the building. Two (2) rooftop makeup air units serve kitchen hoods.

There are also four (4) DX units with reheat. The walk-in freezers and coolers have water source heat pumps and a dedicated cooling tower. Much of the HVAC equipment has pneumatic controls. The original steam radiators are scheduled for renovation.

Building 80:

Engineering Shops are housed in this 10,088 square foot historic building. It was constructed in 1944 with a pitched, shingled roof and brick façade. While cooling is provided by a ductless split system and window air conditioners, it also served by ten (10) steam radiator units supplied by the central boiler plant.

Building 89:

The Mental Health and Prosthetics building is 29,680 square feet, two (2) stories, and was built in 1958. The flat built up roof appears aged, and the façade is brick. The original heating and ventilation system was converted in 1986 to a multi-zone cooling system with steam reheat coils in thirty (30) zones. A 100% outside air packaged DX unit serves the workshop. Controls include a mixture of pneumatic and DDC. Outpatient visits total approximately 24,000 annually.

Building 90:

Recreation storage is located in this 990 square foot building constructed in 1958. It has a pitched roof with shingles and red brick exterior walls. The space is conditioned with window air conditioning units.

Building 101:

Office of Resolution Management, Rad. Safety and Reproduction are located in the three (3) story, 23,660 square foot building constructed in 1923. The façade is stucco and the roof is pitched with shingles. The building is listed as historic and has four (4) split system DX units. Eight (8) steam radiators on the second floor are not currently in use.

Building 102:

The three (3) story, 25,912 square foot building constructed in 1923 houses OIM and Storage. The historic registered building has a pitched, shingled roof and stucco on the exterior walls. Two (2) chilled water air handling units provide cooling to all rooms except server rooms with hot water reheat to variable air volume boxes. These units are variable air volume with variable frequency drives on both the supply and return fans. Many of the zone controls are still pneumatic. There is a steam to heating hot water converter in the basement. The two (2) server rooms are served by a Multistack air cooled chiller and are supplemented by newly installed Data-Aire computer room air conditioning units that are utilized as backup in the event of failure of the chiller or any part of the chilled water system.

Building 103:

The three (3) story, 28,956 square foot building is a Dormitory built in 1923 with a stucco facade. The pitched roof is shingled with two sky lights. This building is listed on the historic registry. The outside air unit is direct expansion.

Water source heat pumps serve the rooms with supplemental hot water heating. The closed circuit cooler is located across the street, and the steam to heating hot water converter is in the basement.

Building 104:

The Law Enforcement Training Center is located in the three (3) story, 9,167 square foot building with which is listed on the historic registry. It was constructed in 1923 with a pitched, shingled roof and stucco faced exterior walls. Water source heat pumps condition the building.

Building 105:

Little Rock Employee Education Resource Center Support facilities are located in a 13,787 square foot historic building constructed in 1923. The building has a red brick façade and the roof has a pitched section with shingles and two flat roof areas. An outside air unit with 2-stage steam heating is located on the roof. Additionally, four (4) packaged heat pumps serve the building.

Building 106:

The Director and Chief of Staff are located in this 6,672 square foot office building constructed in 1923. The roof is pitched with shingles, and the two (2) story exterior walls are red brick. The building is listed in the historic registry. A split system DX air handling unit serves the building’s cooling needs. The steam to heating hot water converter and pump are enabled to provide heating when the outside air temperature drops below 80°F.

Building 107:

This 2,590 square foot housing building is designated as Single Quarters, constructed in 1928 with red brick walls and a pitched roof with shingled roofing. The historic registered building has seven (7) steam radiators for heating.

Building 111:

This office building houses Audiology and Veterans Benefits Administration functions in a 51,468 square foot building built in 1928. The three (3) story stucco exterior has both a pitched roof with shingles and flat roof areas. This building is listed on the historic registry. Chilled water air handling units with hot water heating and split system DX units condition the building. Steam is used for nine (9) steam radiators and converted to hot water and pumped locally within the building. Outpatient visits total approximately 5,700 annually.

Building 114:

The Engineering Shops building was built in 1930, is 3,493 square feet, and is listed as historic. This brick building has a flat built-up roof. It is served by a packaged DX system and three (3) steam radiators.

Building 115:

Another Engineering Shops building is located in a 7,709 square foot building constructed in 1930. Two (2) floors make up the historic red brick faced building with a pitched roof of shingles and metal roofing. A packaged air handling unit with steam heating coil conditions the building.

Building 117:

The Greenhouse is a 3,043 square feet, single story building constructed in 1930. It has a pitched roof with shingles and a stucco façade. This vacant building is listed as a historic structure. Steam is connected to this building.

Building 159:

The 28,029 square foot Laundry facility was built in 1956 with a red brick façade and three (3) floors. The roof is a flat built up roof. Five (5) chilled water air handling units with hot water heating serve the main laundry floor, and two (2) more deliver air to offices. Two (2) steam-to-heating hot water converters and pumps are located in the basement.

The chilled water tertiary pump is also located here and is enabled when the outside air temperature exceeds 55°F.

Building 170:

The Patient Facility is the largest building on the site at 603,409 square feet, which includes four (4) floors and a penthouse level. It was constructed in 1983 of red brick with a flat built up roof. The chilled water air handling units are variable air volume units with steam preheat face and bypass dampers and hot water reheating. While most units have variable frequency drive fan control, AHU-10 has inlet guide vanes. Discharge air temperatures are reset based on return air temperatures. Two (2) heating hot water pumps and heat exchangers are enabled when the outside air temperature is 60°F and the supply temperature is reset based on outside air temperature. A significant portion of the controls are still pneumatic. The chiller plant is located in the basement as previously described. The building houses 356 beds and serves approximately 228,000 outpatient visitors annually.

Building 182:

The Warehouse built in 1983 has 26,141 square feet of shipping and storage capacity. This red brick, single story building has a sloped standing seam roof. Four (4) chilled water air handling units with steam face and bypass dampers and economizer dampers condition the space.

Building 185:

Engineering Grounds is housed in this metal sided building of 1986. It is 6,536 square feet and has a metal roof. It is conditioned with a packaged DX unit.

Building 190:

The Law Enforcement Training Center is a four (4) story, 45,596 square foot building constructed in 1995. The roof is pitched with shingles and the façade is red brick. The building is served by water source heat pumps and an outside air handling unit. Two (2) parallel variable speed pumps serve the loop. Two (2) converters allow for heating hot water.

Building 191:

The Firing Range is 11,001 square feet and was added adjacent to the Training Center in 2002. It has brick exterior walls with a pitched shingle roof. A chilled water air handling unit with steam preheat is controlled by an occupancy sensor. The ventilation air handling unit uses chilled water steam preheat. Water source heat pump units condition the gym area. The chilled water is produced locally with an air cooled chiller which is enabled at outside air temperatures greater than 50°F.

Building 192:

This 6,000 square foot building, built in 2007, functions as the Security Investigation Center. It has metal siding and a standing seam roof. Two (2) DX units serve the building.

Building 193:

The Law Enforcement Training Center Administration is located in the two (2) story, 15,710 square foot facility built in 2015. It has a standing seam roof and a brick facade. The building is conditioned by a split system DX unit with electric resistance heating.

The Little Rock VA Medical Center, called the John L. McClellan Memorial Hospital, is an 823,272 total square foot facility in downtown Little Rock, Arkansas on approximately twenty-four (24) acres adjacent to the University of Arkansas Medical Sciences campus. This eight (8) story major hospital building with an additional penthouse level was built in 1983. Each floor is arranged into five (5) pods. The central utility plant, generator plant, administration and laboratories are located on the ground floor. As the public entrance to the facility, the first floor provides registration, waiting, food service, administration offices and exam rooms. An addition of 14,000 square feet to the original pod construction on the first floor serves as an intensive care unit. Surgical suites, laboratories and offices are located on the second floor. The third floor primarily houses mechanical systems, including approximately 85% of the building’s air handling units. Patient rooms are located in the fourth through seventh floors along with laboratories on fifth floor and the library on the seventh floor. With 195 operating beds, it provides tertiary care with nursing home and intermediate care as the primary care units. Outpatient visits total approximately 628,000 annually and 1,325 employees work at the hospital. The building has flat built-up roofing and double glazed windows in the brick faced exterior walls with skylights in the atrium. The building is classified as a moderate - high region of seismicity for design.

Entergy Arkansas, Inc. provides electric utility service for the site. Water and sewer services are purchased from Central Arkansas Water through Utility Billing Services. The natural gas utility service is provided by Constellation Gas.

Steam is generated on the ground floor with three (3) Johnston Boiler brand fire tube boilers. Each 500 BHP boiler has a capacity of 16,900 pounds per hour of steam. The boilers are original to the building, and the boiler feed pumps were replaced in 2010. General hospital uses of space heating and domestic hot water heating require a steam set point of 70 psi with pressure reductions to 30 psi for air handler preheat and some medical equipment and 60 psi for sterilizers. The boilers can burn either natural gas or fuel oil #2, but natural gas is the typical fuel consumed. Two (2) sets of steam to heating hot water converters with dedicated pumps provide hot water for reheat boxes. Steam traps are monitored with a wireless system that is not connected to the building automation system.

There is a central chilled water plant on the ground floor with three (3) water-cooled centrifugal chillers delivering chilled water to the facility in a primary, secondary pumping arrangement. Chillers 1 and 2 are 1,400 tons each, and Chiller 3 has 450 tons of capacity. Chiller 2 was replaced in 2017, while the other two (2) units date to 2005. Each has its own primary chilled water pump with isolated bypasses between them. Three (3) cooling towers are located on the lower roof level with dedicated pumps for the chillers and a pair of condenser water pumps to serve the water cooled compressors for the coolers and freezers. The condenser water piping is reported to be too small for the current cooling tower loads. Each of the two (2) larger towers has dual fans with variable frequency drives. The smaller tower serves the 450 ton chiller and process loads for the facility. It also has a variable frequency fan drive.

The drives adjust to provide a constant condenser supply temperature. Peak facility load in the summer requires the operation of both 1,400 ton chillers.

A roof mounted, air cooled glycol chiller provides cooling to the two (2) surgery suite air handling units. The pharmacy air handling unit also has a dedicated air cooled glycol chiller located on the roof.

Thirty-five (35) variable air volume air handling units are served with chilled water, steam and heating hot water from the central plant through steam to water heat exchangers. Most were installed in 2009 and are still in good condition.

These units have approximately 1,000 variable air volume boxes with heating hot water coils. Ninety percent of the boxes have adjustable local thermostats. Additionally, about 300 are connected with ceiling mounted motion sensors to set back heating and cooling set points when spaces are unoccupied. The remaining air handling units are constant volume with steam preheat and chilled water cooling. Several have enthalpy heat wheels. All air handling units are either located on the third floor or on the roof of the building.

The building automation system is by Siemens with three (3) Apogee Insight workstations on the third floor and the central plant, which was installed in 2011. It serves approximately 95% of the mechanical equipment in the facility.

The facility has installed roof mounted solar photovoltaic panels over one pod of the building and carport mounted panels in two of the three major parking areas to offset energy use. About half of the remaining exposed roof area appears to have a cool roof installed.

In addition to the hospital building, there is a 2,000 square foot unconditioned Grounds Maintenance Building at the site.

Utility Data and Analysis The following tables and graphics summarize the average annual costs incurred and energy consumed at the two locations during FY 16 and FY 17.

Cost Expenditure, Dollars

Site Sqft Electric Natural Gas Water/Sewer Summary $/Sqft

North Little Rock

VAMC 1,500,000 $1,633,675 $362,219 $428,983 $2,233,877 $1.62

Little Rock

VAMC 823,272 $1,498,850 $288,103 $519,212 $2,306,165 $2.80

Summary 2,323,272 $3,132,525 $650,322 $948,195 $4,540,043 $2.04

Annual Energy and Water Expenditure, MMBtu, kgal

Site Sqft Electric

MMBTU

Natural Gas

MMBTU

Water/Sewer kgal Summary MMBTU kBtu/Sqft gal/ Sqft

North Little Rock

VAMC 1,500,000 79,375 107,577 54,870 186,952 124.6 36.6

Little Rock

VAMC 823,272 77,761 85,755 54,442 163,516 198.6 66.1

Summary 2,323,272 157,136 193,332 109,312 350,468 150.9 47.1

Electric MMBTU, 157,136, 45%

Natural Gas

MMBTU, 193,332,

55%

Energy Expenditure (All Sites), MMBTU

Electric, $3,132,525 , 66%

Natural Gas, $650,322 , 14%

Water/Sewer, $948,195 , 20%

Cost Expenditure (All Sites), Dollars

Below are the base year utility rates used for calculation of energy cost savings for this project.

Utility Rate Units Notes

Elec. Consumption 0.0520 $/kwh Based on FY 16 & FY 17

Elec. Demand 10.04 $/kW Based on FY 16 & FY 17

Elec. Blended 0.0702 $/kwh Based on FY 16 & FY 17

Gas 0.3367 $/therm Based on FY 16 & FY 17

Water 2.00 $/kgal Based on FY 16 & FY 17

Sewer 5.84 $/kgal Based on FY 16 & FY 17

Water & Sewer Blended 7.82 $/kgal Based on FY 16 & FY 17

Utility Rate Units Notes

Elec. Consumption On Peak 0.0360 $/kwh Based on FY 16 & FY 17

Elec. Consumption Off Peak 0.0341 $/kwh Based on FY 16 & FY 17

Elec. Consumption Blended 0.0347 $/kwh Based on FY 16 & FY 17

Elec. Demand 15.32 $/kW Based on FY 16 & FY 17

Elec. Blended 0.0658 $/kwh Based on FY 16 & FY 17

Gas 0.3360 $/therm Based on FY 16 & FY 17

Water 1.85 $/kgal Based on FY 16 & FY 17

Sewer 7.69 $/kgal Based on FY 16 & FY 17

For the projection of savings over the project term, TLS-CES escalated these rates for future years using FEMP’s Energy Escalation Rate Calculator (EERC 2.0-17). The output is shown below.

Technical Assessment The Descriptions below provide a generalized overview of the ECM scope. The TLS-CES ECM training approach is comprehensive and is described in detail as part of the ECM Installation Activities section following the ECM Descriptions. See Appendix J-13 for calculation summary associated with each individual ECM.

ECM Descriptions – North Little Rock VAMC Technology Category 1, ECM NLR.1.01 (Bldg. 170, Heating Hot Water)

The existing heating hot water for Building 170 variable air volume (VAV) boxes is provided by two (2) heat exchangers to convert steam to heating hot water and two (2) 420-gpm heating hot water distribution pumps. TLS- CES propose to replace the existing heat exchangers and pumps with condensing boilers that can operate at lower temperatures and provide higher efficiencies. The boiler plant will be a skid mounted assembly with high efficiency condensing boilers, pumps, expansion tank, shot feeder, air separator, hydronic specialties, VFDs and controls in a modular enclosure with suitable wind, snow and seismic ratings, ventilation and space heating due to the space limitations in Building 170. Floor drainage will be provided and plumbed into the existing sanitary system. Hot water supply and return piping will be connected between the skid and the existing distribution system. New electrical service will be provided to the skid to power the components. New natural gas service will be provided to the building to serve the boiler skid. All work will be performed in accordance with the VA HVAC Design Manual, Nov. 2017 and VA Master Specification sections as applicable to the scope of the work being designed.

An average of usage of steam demand, gas consumption, steam generated (assumed same units as gas consumption due to their calculated efficiency), makeup gallons and % makeup from boiler log data between 2016 and 2017 was determined per month for the existing equipment. Energy savings was then calculated by comparing the average existing efficiency of 77% with a flat proposed efficiency. In this case a new efficiency was assumed to be 90%. Loss of steam was accredited to the condensate and steam piping, as well as other components of the system. For this analysis a 25% loss for both piping systems was assumed. Steam pressure for this analysis was assumed to be 75 psi. Makeup water was estimated to come in at 60°F. Hot water for VAV reheat is assumed to be 30% of the building heating load in the savings calculation. During the IGA phase, the existing hot water distribution from the heat exchanger will be measured with a BTU meter to confirm / adjust the calculation. It is anticipated that the added equipment will incur additional operation and maintenance costs. A budget amount for the increased need for maintenance has been included in the project. The ECM calculation used a BIN spreadsheet model.

This ECM is only applicable if ECM NLR.1.03 is not pursued.

Calculation Summary:

Other (MMBtu/yr)

Other Savings Type

0 $0 0 $0 27,537 $92,718 0 $0 3,117 $24,372 $0

0 $0 0 $0 23,507 $79,150 0 $0 1,559 $12,186 $0

0 $0 0 $0 4,030 $13,568 0 $0 1,559 $12,186 $0

Natura l Gas (MMBtu/yr)

Natura l Gas

Water (kGal ) Other $ O&M cost savings

($/yr)

Basel ine

Projected

Savings

Electrici ty Use (kWh/yr)

Water $ Electrici ty Use $

Electrici ty Demand (kW/yr)

Electric $

Technology Category 1, ECM NLR.1.02 (Bldgs. 7, 12 – 15, 24, 26, 40, 66, 68, 80, 101, 107, 111 & 114, Thermostatic Valves)

There are approximately 154 radiator units throughout the campus that currently operate with minimal control.

Controls for the units include a mix of functional manual valves, non-functional valves, and no valve at all. When terminal heating units (radiators or unit convectors) overheat a room, it is often difficult to use the unit’s manual valves to adjust the steam flow, especially if the valves are in poor condition and / or are covered. In contrast, thermostatic radiator valves (“TRVs”) can be adjusted to maintain room temperature at a set point. They control the steam flow to the terminal heating units and improve occupant comfort.

TLS-CES propose to provide new Macon thermostatic control valves with adjustable thermostats on supply lines to radiators at the subject buildings in order to automate and control temperatures. All work will be performed in accordance with the VA HVAC Design Manual, Nov. 2017 and VA Master Specification sections as applicable to the scope of the work being designed.

A mass flow rate of 2.5 lb/hr. at 10 psi was used for the steam radiators. Each radiator is assumed to serve 100 sf of exterior wall load with no insulation. The space temperature was modeled as 70°F for the proposed control. The ECM calculation used a BIN spreadsheet model.

The table below shows quantities of TRVs to be installed by building.

Building Bldg. Type Sty TRV 12 residential 11 13 residential 14 14 residential 14 15 residential 7 24 residential 14 26 shop 6 40 residential 10 66 office 4 68 office 15 80 shop 10 107 residential 7 111 office 39 114 shop 3

Grand Total 154

Technology Category 1, ECM NLR.1.03 (Steam System Decentralization)

The scope of decentralizing the steam plant system consists of replacing a single large central steam plant with individual hot water boilers that would be located at the buildings which they serve. The intent is to eliminate the steam and condensate losses in the site’s aged distribution piping. It is estimated that approximately 25% of the steam usage is being lost to piping leaks and faulty steam traps. By decentralizing the steam system, hundreds of feet of aged underground steam and condensate piping will be eliminated along with the leakage associated with the pipe.

In a report produced by Pacific Northwest National Laboratory, it was recommended that “the VA or an ESCO be commissioned to conduct a feasibility study for eliminating the central steam plant”. The effort involved in defining a precise cost of replacing the existing central steam system with multiple systems local to approximately 52 buildings is a considerable engineering and construction feasibility study that far exceeds the scope of this preliminary audit.

Based on the recommendations of the feasibility study, the next step would be to develop a plan to convert buildings to gas boilers/furnaces and gas/electric service water heaters in order to remove…