1768335 NASO B345 Replace Two Closed Circuit Evaporative Coolers Scope of Work (FINAL)(041924).pdf

BUILDING 345 – REPLACE TWO CLOSED CIRCUIT EVAPORATIVE COOLERS eProjects WO#: 1768335

NAVAL AIR STATION OCEANA, VIRGINIA BEACH, VIRGINIA

SCOPE OF WORK 19 April 2024 Page 1 of 110

***UNCLASSIFIED***

BUILDING 345

REPLACE TWO CLOSED CIRCUIT EVAPORATIVE COOLERS

at the

Naval Air Station Oceana, Virginia Beach, Virginia

PREPARED BY:

NAVFAC MID-ATLANTIC, PWD OCEANA, FEAD PM&E PRA21B3

NAS Oceana, 953 Hornet Drive, Building 820, Suite 210

Virginia Beach, Virginia 23460-2197

PREPARER:

FEAD Engineer: David W. Gregory III, P.E.

Submitted By: Christopher B. Morris, P.E. Date: April 15, 2024

APPROVED BY:

Facilities Management Division Director: Mark A. Outman PRA21B3 Design Department Branch Head: Christopher B. Morris, P.E.

Naval Facilities Engineering Systems Command

NAVFAC MID-ATLANTIC

SCOPE OF WORK 19 April 2024 Page 2 of 110

1. POINTS OF CONTACT:

FEAD Contracting Officer: Tanya M. Corcoran (757) 433-2668 (office) FEAD Contract Specialist in charge: TBD

FEAD Project Manager (PM): Christopher B. Morris, P.E. (757) 433-3484

FEAD Design Manager (DM): David W. Gregory III, P.E. (757) 433-3485 (office)

(757) 493-2547 (cell)

Facility Maintenance Specialist (FMS): Logan Mille r (757) 433-2292 (office)

(757) 754-9950 (cell)

2. GENERAL:

2.1 The Contractor must provide supervision, labor, material and equipment required to perform all work for the following project: Provide the repair by replacement of two closed circuit evaporative coolers which serve the existing water source heat pump system in Building 345, NAS Oceana, Virginia Beach, Virginia. Demolish existing and provide controls for the existing condenser water system to integrate the close circuit evaporative cooler and condenser water system control into the existing Johnson Controls Metasys Direct Digital Control (DDC) system. All work must be done in a manner to provide a complete, usable and finished end product. See paragraph “7.

WORK REQUIREMENTS” for an expanded and detailed scope of work.

2.2 The Contractor must comply with the requirements of the most current Contract as prescribed by the Contracting Officer for use on this contract.

2.3 A Pre-Proposal site meeting must be held at the project site to review and discuss the scope of work and assess existing field conditions, prior to Award of this Task Order. The Contractor and his key personnel involved with the project must attend with the Government.

Coordinate/schedule the date and time with the Contracting Officer’s approval.

2.4 The reference documents for this building are available upon request via DoD SAFE file transfer.

This reference information (drawings, sketches, specifications, etc.) must be used for informational purposes only, and may not be complete and/or accurately reflect current as-built conditions. The Contractor must not solely rely on the reference information to determine existing conditions, but must field verify all existing conditions pertinent to the project.

2.5 All work must be performed in accordance with, but not limited to, standard industry practices, applicable local, state and federal codes, laws and regulations, and the Unified Facilities Criteria (UFC’s).

2.6 FOR PROJECTS INVOLVING LESS THAN 10,000 SQUARE FEET OF LAND DISTURBANCE,

OR WHEN NO LAND DISTURBANCE PROPOSED BUT POTENTIAL FOR STORMWATER

POLLUTION STILL PRESENT (I.E. Painting, Service Connections, Minor building renovations, hazardous material abatement etc.): The contractor must utilize best management practices to ensure materials (Paints, Solvents, Petroleum Products, Trash, Sediment...Etc.) associated with this activity do NOT become a pollutant in storm water runoff.

The Contractor must keep a spill kit on hand in case of any equipment failure, hydraulic line break, etc. if heavy equipment will be used for this project. No discharges to the sanitary sewer system, storm system or surface waters are permitted without prior coordination with, and approval from the Water Program Manager. Concrete mixing and/or pouring must be done in a way to prevent

SCOPE OF WORK 19 April 2024 Page 3 of 110 entry to storm water conveyances or surface waters. Notify NAVFAC EV-Environmental immediately of any spills (anything other than storm water) to the storm system as well as any spills to any sewer system since notifications will need to be made to the regulatory authorities within 24 hours of discovery.

2.7 Supervision: Have a Supervisor fluent in English on the job site during working hours at all times.

The Supervisor must be a United States Citizen or a Documented Legal Resident of the United States of America.

2.8 Equipment Inventory Form: The Contractor must submit an Equipment Inventory Form for existing equipment to be demolished/removed, or for new equipment to be provided under this contract. The Equipment Inventory Form must be completely filled-out and provided for each piece of equipment as stated in “PART 8 – ATTACHMENTS, EQUIPMENT LISTING”. Further clarification on the equipment types must also be discussed at the PAK or Pre-Construction Meetings, or as directed by the Contracting Officer.

Submit all Equipment Inventory Forms to the Contracting Officer, prior to demolition of the existing equipment and prior to installation of the new equipment. (See PART 8 – ATTACHMENTS for the Equipment Inventory Form to utilize).

3. SPECIAL SCHEDULING REQUIREMENTS/WORK PROCEDURES:

3.1 The project Contract Completion Date (CCD) must be 210 calendar days from Award of this Task Order.

3.2 The facility must remain occupied and in operation (including but not limited to HVAC, domestic water/sewer, power and telecommunications) during the entirety of this project.

3.2.1 Existing and adjacent spaces to remain in operation during construction must be protected from damage, dust, and debris at all times. Damage to any existing spaces, finishes, items, furniture and equipment, as a result of the Contractor’s operations, must be replaced in-kind by the Contractor at no expense to the Government.

3.2.2 Provide a temporary closed circuit evaporative cooler system for the sequenced replacement of the closed circuit evaporative coolers to maintain the operation of a combination of two closed circuit evaporator coolers at all times.

This temporary closed circuit evaporative cooler system must be in place within 30 days from the award of this contract. Temporary closed circuit evaporative cooler system must include all supporting piping, controls, freeze protection, electrical and maintenance service to maintain stable and reliable temporary condenser water service.

3.3 UTILITIES LOCATION AND VERIFICATION (Exterior): Prior to digging, the appropriate digging permit must be obtained. All underground utilities in the work area must be positively identified by a private utility locating service in addition to any station locating service and coordinated with the station utility department, prior to any digging. Any markings made during the utility investigation must be maintained throughout the contract. The Contractor must physically verify underground utility locations by hand digging using wood or fiberglass handled tools when any adjacent construction work is expected to come within three feet of the underground system. Digging within 2 feet of a known utility must not be performed by means of

SCOPE OF WORK 19 April 2024 Page 4 of 110 mechanical equipment; hand digging must be used. If construction is parallel to an existing utility expose the utility by hand digging every 100 feet if parallel within 5 feet of the excavation.

3.4 UTILITIES LOCATION AND VERIFICATION (Interior): Utilities located within concrete slabs or pier structures, bridges, and the like, are extremely difficult to identify due to the reinforcing steel used in the construction of these structures. Whenever contract work involves concrete chipping, saw cutting, or core drilling, the existing utility location must be coordinated with station utility departments in addition to a private locating service. Outages to isolate utility systems must be used in circumstances where utilities are unable to be positively identified.

The use of historical reference drawings does not alleviate the contractor from meeting this requirement. The contractor must perform positive identification and locating of existing utilities prior to any concrete chipping, saw cutting or core drilling of any kind.

3.5 Environmental Protection Requirements:

3.5.1 In the event that hazardous waste is generated, the hazardous waste program manager must be contacted for the appropriate guidance. In addition, any movement of soil/fill material outside of project boundaries, meaning both soil brought onsite and soil from the site relocated to other areas, must be coordinated with the hazardous waste program manager to ensure environmental compliance. POC: Cole Martin, (757) 433-2589.

3.5.2 In cases where Mechanical Equipment (Mechanical Rooftop Equipment, Boilers, Chillers Boilers, Chillers, Closed Circuit Evaporative Coolers, pumps, etc.) will be disconnected/reconnected or demolished due to the work under this contract, the contractor must utilize existing isolation valves (if available and usable/pressure holding) and other types of non-destructive system(s) isolation to minimize the draining of potable water, make-up water, condenser water, and heating water piping systems to provide the necessary system connections and disconnections.

3.5.2.1 All water drained from the HVAC systems must be captured and containerized for disposal off Government property in accordance with all applicable federal, state and local regulations. This water will be from, but not limited, the following systems:

- Water source heat pump system condenser water

- Closed circuit evaporative cooler spray water/heat evaporation loop water

- Make-up water

- Water Treatment

3.5.2.2 This wastewater must not be discharged to storm.

3.5.2.3 This wastewater must not be discharged to sanitary sewer without written approval.

3.5.2.4 At Contractor risk, the Contractor may submit a “Request to Discharge to HRSD” for approval to discharge to sanitary. This “Request to Discharge to HRSD” must include the following:

- Estimated volume (gallons) of proposed discharge

- Safety Data Sheets (SDS) for any chemicals that have been added to the system (if this is an existing system and SDS are not available, state “existing system - SDS data not available” in the request.

- Source of the wastewater (condenser water system, make-up water system, water treatment system, etc.)

SCOPE OF WORK 19 April 2024 Page 5 of 110

3.5.2.4.1 Once the “Request to Discharge to HRSD” is received, NAS Oceana NAVFAC Environmental Department will coordinate with HRSD to obtain the required sampling parameters and forward this direction to the contractor.

3.5.2.4.2 Once the contractor provides the sampling of the containerized wastewater per HRSD requirements, submit the sample results to NAS Oceana NAVFAC Environmental Department and NAS Oceana NAVFAC Environmental Department will submit the sampling results to HRSD for approval or denial for discharge to sanitary sewer.

3.5.2.4.3 All correspondence between the contractor and NAS Oceana NAVFAC Environmental Department must be transmitted through the Contracting Officer.

3.5.2.5 Water Program Manager POC: Dawn Friedrichs (757) 433-3434

3.5.3 Additional Environmental Compliance (Navy Region Mid-Atlantic Environmental Checklist):

Refer to Part 8 – Attachments, Section 8.7 NAVY REGION MID-ATLANTIC ENVIRONMENTAL CHECKLIST. Comply with all applicable Comments/Requirements under section “ADDITIONAL REQUIREMENTS OR EV PROGRAM MANAGER COMMENTS”, pages 6 to 12.

3.6 Pre-Outage Coordination Meeting: Apply for utility outages at least 15 days in advance to the Contracting Officer. As a minimum, the request must include the location of outage, utilities being affected, duration of outage and any necessary sketches. Any/all utility outage requests must be approved by the Contracting Officer prior to starting the work. Once approved, and prior to beginning work on the utility system requiring shut down, attend a pre-outage coordination meeting with the Contracting Officer to review scope of work and the lock-out/tag-out procedures for worker protection. No work will be performed on energized electrical circuits unless proof is provided that no other means exist.

3.7 Control of Hazardous Energy (Lock-out/Tag-out): Provide and operate a Hazardous Energy Control Program (HECP) in accordance with EM 385-1-1 Section 12, 29 CFR 1910.333, 29 CFR 1915.89, and paragraph HAZARDOUS ENERGY CONTROL PROGRAM (HECP).

3.8 In general terms, demolition work and the use of word “demolish”, must include the removal and effective management and disposal of existing construction and or structures. Contractor must take care to prevent damage to existing utilities and construction that are not scheduled for demolition. If damage occurs, the Contractor must make repairs, or replacement with new, to the satisfaction of the Contracting Officer and at no cost to the Government. Selling of demolished or salvaged materials and equipment on government properties is prohibited.

3.9 Work Hours: The Contractor’s normal working hours must be between 0700 to 1630, Monday through Friday, excluding Federal Holidays and other days specifically designated by the Contracting Officer. Advance approval from the Contracting Officer is required for contractor personnel to work outside of normal working hours. Any/all Contractor’s requests to work outside of normal working hours must be given to the Contracting Officer in a form of a written request, occurring no less than 5 calendar days prior to such work, to allow for appropriate approvals and inspections process. The written request must include as a minimum, the specific dates, hours, location, type of work performed, and contract personnel performing the work. Based on the written request, the Contracting Officer, at his discretion, may approve or disapprove the work outside of normal working hours.

SCOPE OF WORK 19 April 2024 Page 6 of 110

3.9.1 All utility outages (electrical, HVAC, water, sewer, fire alarm, fire sprinkler communications, etc.)

must be coordinated with and approved by the Activity (through the Contracting Officer). All utility outages are at the contractor’s expense. Schedule all planned utility outages a minimum of 48hrs in advance, occurring after work hours, weekends and/or Federal Holidays unless otherwise approved by the Contracting Officer.

3.10 Access to construction work areas must be limited to the Contractor’s personnel, or other approved personnel as designated by the Contracting Officer. Construction work areas must have complete and secure separation from adjacent occupied areas, as approved and directed by the Contracting Officer and Activity’s Security Officer.

3.11 Passes and Badges: All Contractor employees, including subcontractors, and subcontractors’ employees, suppliers, and suppliers’ employees must be required to comply with the Installation Security Requirements regarding personnel, vehicle, equipment, security passes/badges and access to the jobsite. Nothing in the contract must be construed in any way to limit the authority of the Commanding Officer to prescribe new, or to enforce existing security regulations governing the admission or exclusion of persons and the conduct of persons while aboard the station, including but not limited to, the rights of search of all persons or vehicles aboard the station. All Contractor employees/subcontractors must have current and valid government issued Contractor Base Access Passes and Badges, in order to perform work under this contract.

Coordinate with the Contracting Officer for other specific security and access requirements.

a) Access to Buildings/ Occupied Buildings: The Contractor may work in or around existing occupied buildings. It must be the Contractor’s responsibility, through the Contracting Officer, to obtain access to building and facilities and arrange for them to be opened and closed. Do not enter the building(s) without prior approval of the Contracting Officer. The existing buildings and their contents must be kept secure at all times. Provide temporary closures as required to maintain security. Contract personnel will not be permitted in security-regulated buildings or areas unless cleared by the Security Officer.

b) Passes and Badges: Contractor employees and representatives performing work under this contract are required to be either United States Citizens or Documented Legal Residents, status of which, MUST be verified/confirmed by the Prime Contractor. All Contractor employees must obtain the required employee and vehicle passes/badges. Each employee must wear the government issued badge, AT ALL TIMES, over the front of the outer clothing for awareness and visibility. Failure to obtain government issued security and base access passes/badges must result in the revocation of the Prime Contractor’s Base Access Contractor Passes/Badges, at the sole discretion of the Contracting Officer and/or the Installation Security Officer. The Prime Contractor is totally responsible to instruct/verify/confirm that all employees and subcontractors obtain valid/approved government issued passes and badges. Any work stoppage or work delays caused by the Contractor/Subcontractor’s failure to comply with obtaining appropriate passes/badges or other Security compliance must not be a cause for contract performance time extension. The Contractor must be responsible for immediately turning in all terminated employee’s badges to the Pass and ID issuing office.

c) Special security requirements apply to this contract. All Contractor personnel associated with this contract must obtain personnel security clearances from the Activity’s Building Manager in order to perform work in and around Building 345. Strict adherence to the rules and regulations, as set forth by the Activity’s Security Officer, must be complied with at all times.

SCOPE OF WORK 19 April 2024 Page 7 of 110

Responsibility for Escorts: The Contractor must be responsible for coordinating escorts with the Building Activity/Tenant at all times. The Contracting Officer and other NAVFAC personnel “must not” be responsible for the coordination of escorts for Contractor personnel.

3.12 ELECTRONIC CONSTRUCTION AND FACILITY SUPPORT CONTRACT MANAGEMENT

(eCMS) is required for this contract: Refer to PART 8 – ATTACHMENTS, Section 8.5 eCMS Specification Section 01 31 23.13 20 for requirements.

3.13 Construction activities may not start until the Contractor provides confirmation of receipt of all new products and materials necessary to complete the work.

4. SAFETY:

4.1 The contractor must comply with the most current edition version of EM-385-1-1 and OSHA CFR

1926. Where differences occur between the two references the more stringent criteria of the two must apply.

4.2 The Contractor must submit the Accident Prevention Plan (APP) and Activity Hazard Analysis

(AHA) plan for approval by the Contracting Officer. Submit within 3 days from issuance of this Task Order, and obtain approval prior to start of any construction activities.

4.3 The Contractor must coordinate personnel egress and life safety of existing occupants with the

Contracting Officer.

5. HAZARDOUS MATERIALS DISCLOSURE STATEMENT(S):

GENERAL HAZMAT STATEMENT: Contractor shall comply with all USEPA and OSHA laws and regulations, along with all other federal, state, and local laws and regulations. Where differences occur, the most stringent application shall apply.

5.1 Asbestos and Lead test reports are not available for Building 345 prior to issuance of this Task

Order. Based on the scope of work, it is not anticipated that any hazardous materials are present within the area of work. However, if hazardous materials are encountered during performance of the work, the Contractor must avoid disturbing any hazardous materials to the fullest extent possible while being able to accomplish the work. If hazardous materials are encountered and disturbed, the Contractor must adhere to the requirements as stated in the subsequent paragraphs below.

5.2 For repair, remodeling, or minor construction and demolition, the Contractor may be required to work in areas that have, but not limited to, flooring, walls, ceilings, insulation, roofing materials and paints etc. etc., that may have asbestos or lead paints, or PCB and/or other hazardous materials requiring abatement and/or management according to applicable National and Local Environmental Protection laws and regulations. For work in soil excavation and other exterior construction etc., the Contractor may be required to work with contaminated material involving abatement or management of these contaminated materials. However, if during the performance of the work the Contractor encounters hazardous substances not known prior to issuance of this Task Order; the Contractor must immediately stop work and inform the Contracting Officer for direction. In no instance must the Contractor perform the work involving the hazardous material without notifying and receiving approval from the Contracting Officer for direction.

5.2.1 Asbestos Containing Materials (For projects that require disturbance or removal): Asbestos containing materials must be removed, transported and managed in accordance with the following

SCOPE OF WORK 19 April 2024 Page 8 of 110 regulations: 29 CFR 1926.1101, and 40 CFR 61-Subpart M.

Category I & II Nonfriable Asbestos: Disturbance, demolition/removal of Category I & II nonfriable asbestos containing materials (approved to be left in place during the work) must be performed in accordance with 40 CFR 61-Subpart M.

5.2.2 Paint Containing Lead, Cadmium and Chromium (For projects that require disturbance or removal): Work which requires the disturbance or removal of paint that has been determined to contain all or any of the following: lead, cadmium and chromium, must be performed in accordance with 29 CFR 1926.62, 29 CFR 1926.1126 and 29 CFR 1926.1127.

5.2.3 Other Hazardous Materials (For projects that require disturbance or removal): Work which requires the disturbance or removal of any of the following: mercury and LLR Components, and PCB’s, must be performed in accordance with 29 CFR 1910.1000, 10 CFR 20, 40 CFR 273, and

40 CFR 761.

5.3 Hazardous Materials Reports: In the event that work involves hazardous materials, provide the following reports:

5.3.1 Daily Reports: Notify the Contracting Officer of work involving hazardous materials abatement and removal, including quantities involved, on daily reports.

5.3.2 Hazardous Material Inventory Report: The Contractor must provide a list of all hazardous materials used on the site.

6. SUBMITTALS:

6.1 The Contractor must submit the following for government approval, prior to the start of any construction activities:

6.1.1 Shop Drawings: Submit shop drawing product data consisting of Catalog cuts, illustrations, schedules, diagrams, performance charts, instructions, and brochures illustrating size, physical appearance and other characteristics of materials, systems or equipment for some portion of the work.

Submit manufacturer’s written detailed product data cut sheets, with instructions for installation, adjustment, cleaning and maintenance instructions.

Submit shop drawing product data for the following:

6.1.1.1.1 Temporary closed circuit evaporative cooler system

6.1.1.1.2 Closed circuit evaporative coolers

6.1.1.1.3 Piping, piping insulation, insulation jacket, piping fitting and accessories

6.1.1.1.4 Basin (sump) evaporative water treatment system:

In addition to shop drawing data, submit proposed water treatment plan including a layout, control scheme, a list of existing make-up water conditions including the items listed in paragraph WATER ANALYSIS", a list of chemicals, the proportion of chemicals to be added, the final treated

SCOPE OF WORK 19 April 2024 Page 9 of 110 water conditions, and a description of environmental concerns for handling the chemicals.

6.1.1.1.5 Direct Digital Control (DDC) system and laptop

6.1.1.1.6 Electrical devices, wiring, conduit and accessories

6.1.2 Testing Data (Test Reports):

Submit Test Reports signed by authorized official of testing laboratory that a material, product or system identical to the material, product or system to be provided has been tested in accord with specified requirements. Unless specified in another section, testing must have been within three years of date of contract award for the project.

Report that includes findings of a test required to be performed on an actual portion of the work or prototype prepared for the project before shipment to job site.

Report that includes finding of a test made at the job site or on sample taken from the job site, on portion of work during or after installation.

Submit Test Reports for the following:

6.1.2.1.1 Closed Circuit Evaporative Coolers – Installation Instructions

6.1.2.1.2 Closed Circuit Evaporative Coolers – Field Acceptance Test Plan

6.1.2.1.3 Closed Circuit Evaporative Coolers – Field Acceptance Test Report

6.1.2.1.4 Basin (Sump) Evaporative Water Treatment System – Water Analysis Test Reports

6.1.2.1.5 Direct Digital Controls (DDC) system performance verification testing (PVT)

6.1.2.1.6 Testing and Balance (TAB) – Final TAB Report

6.1.3 Manufacturer Warranties: Submit warranty data for the following:

6.1.3.1 Closed Circuit Evaporative Coolers

6.1.3.2 Basin (Sump) Evaporative Water Treatment System

6.1.4 Operation and Maintenance Data: Submit data provided by the manufacturer, or the system provider, including manufacturer's help and product line documentation, necessary to maintain and install equipment, for operating and maintenance use by facility personnel.

Data required by operating and maintenance personnel for the safe and efficient operation, maintenance and repair of the item.

An operation manual in bound 8-1/2 by 11 inch booklets listing step-by-step procedures required for system startup, operation, abnormal shutdown, emergency shutdown, and normal shutdown.

Include testing procedures used in determining water quality.

An maintenance manual in bound 8-1/2 by 11 inch booklets listing routine maintenance procedures, possible breakdowns and repairs, and a trouble shooting guide.

Submit Operation and Maintenance Data for:

6.1.4.1 Closed Circuit Evaporative Coolers

SCOPE OF WORK 19 April 2024 Page 10 of 110

6.1.4.2 Basin (Sump) Evaporative Water Treatment System

6.1.4.3 Closed Circuit Evaporative Cooler Control Panels and Direct Digital Control (DDC) system

6.1.5 As-Built Documents: Submit Direct Digital Controls (DDC) and closed circuit evaporative coolers and condenser water control system as-built control drawings and shop drawings data.

7. WORK REQUIREMENTS:

7.1 Demolish the existing closed circuit evaporative coolers in their entirety and provide closed circuit evaporative coolers in the same general area with sump (basin) evaporative water treatment system serving both closed circuit evaporative coolers to provide a complete and operational water source heat pump system for Building 345.

The existing water source heat pump (WSHP) and condenser water systems in Building 345 are existing to remain unless otherwise noted.

The existing water source heat pump and condenser water system is controlled by a direct digital control (DDC) system consisting of the original Control Systems International (CSI) DDC system (provided by ECS Controls Inc.) with an interface device to integrate the CSI Controls into a Johnson Controls Inc. Metasys system for connection to the NAS Oceana Johnson Controls Metasys energy management control system (EMCS) DDC server.

- The existing CSI DDC control system controls the majority of the existing water source heat pumps in Building 345. This portion of the CSI control system must remain.

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SCOPE OF WORK 19 April 2024 Page 11 of 110

- Only one water source heat pump in Building 345 is controlled directly via the Johnson Controls DDC system. This control of this WSHP via the Johnson Controls DDC system must remain.

- Demolish the portion of the existing CSI control system that controls the condenser water system and provide the modification/expansion of the existing Johnson Controls Inc. Metasys DDC system in Building 345 to provide the complete and integrated control of the Building 345 condenser water system, including but not limited to, the existing variable flow condenser water pumps (included variable frequency drives), existing boilers and closed circuit evaporator coolers.

Provide electrical work in accordance with manufacturer requirements and latest edition of National Electric Code (NEC) to support the mechanical scope of work.

Provide a temporary closed circuit evaporative cooler system to support the sequenced installation of the closed circuit evaporative cooler to maintain condenser water service for the duration of this contract.

7.2 TEMPORARY CLOSED CIRCUIT EVAPORATIVE COOLER:

Provide a temporary Closed Circuit Evaporative Cooler system with all accessories, including but not limited to temporary condenser supply/return water piping, system connections, make-up water supply piping and electrical branch circuit(s). Minimum performance requirements:

Condenser Water Flow: 205 GPM Condenser Water Entering Water Temperature (EWT): 101.8 degrees F.

Condenser Water Entering Water Temperature (LWT): 90 degrees F.

Outdoor Air Wet Bulb Temperature: 79 degrees F.

Maximum Coil Water Pressure Drop: 6.24 ft. water Fluid: Water Voltage: 480 volt, 3-phase

Note: The minimum performance requirement for the temporary closed circuit evaporative cooler (205 GPM) is based on the sequenced replacement of the closed circuit evaporative coolers where a combination of two closed circuit evaporative coolers must be in service at all times for the duration of this contract. At no additional cost to the Government, the contractor has the option to provide a larger temporary closed circuit evaporative cooler with capacity to satisfy the full condenser water demand (410 GPM) to allow the concurrent replacement of both closed circuit evaporative coolers.

7.3 DEMOLITION:

7.3.1 Demolish the existing Closed Circuit Evaporative Cooler CC-1 (manufacturer: Baltimore Aircoil

Company, model number: F-1-743-LM, serial number: not legible) and Closed Circuit Evaporative Cooler CC-2 (manufacturer: Baltimore Aircoil Company, model number: F1743-MM, serial number: U037282301) in their entirety, including but not limited to the following:

7.3.1.1 Closed circuit evaporative cooler basin heaters were original equipped with steam heat exchangers which were replaced with electric basin heaters. Provide complete demolition of closed circuit evaporative coolers including the multiple electrical circuits. Coordinate with the electrical scope of work.

7.3.1.2 Demolish condenser water piping (including piping supports) from the closed circuit evaporative coolers back into the mechanical room.

SCOPE OF WORK 19 April 2024 Page 12 of 110

As a part of the temporary equipment installation, provide 6” (supply and return) piping extending from the limits of demolition and provide take-offs (supply and return) for the temporary closed circuit evaporative cooler system (6”) and each new closed circuit evaporative cooler condenser water piping (4”). Provide lug type butterfly valves for each take-off. Connections for temporary services must include flanged connections to remain for current and future temporary services and must be capped and insulated when the temporary service is removed.

7.3.1.3 Demolish make-up water piping (including piping supports) from the closed circuit evaporative coolers back into the mechanical room. Provide temporary cap.

7.3.1.4 Demolish drain/overflow piping (including piping supports) from the closed circuit evaporative coolers back into the mechanical room up to discharges at floor drain(s).

7.3.1.5 Demolish all above grade piping insulation (condenser water, make-up water and drain/overflow), jacket and freeze protection heat tape in its entirety.

7.3.1.6 Demolish the CSI control of the condenser water system (including, but not limited to, closed circuit evaporative coolers, sump heaters, boilers and condenser water pumps) in their entirety.

NOTE: All demolished CSI controllers and control panels must be salvaged and delivered to NAS Oceana Public Works DDC Group as coordinated with the Contracting Officer.

7.3.1.7 Existing closed circuit evaporative cooler concrete equipment pads must remain. Demolish all anchors, fill/patch any remaining voids and prepare existing concrete equipment pads for reuse.

7.3.1.8 Demolish remaining fasteners in wall(s) and equipment pad(s) in their entirety. Fill/patch remain openings with non-shrink grout flush to remaining surfaces.

7.3.2 Demolish the electrical circuits to the closed circuit evaporative cooler control panel and basin heaters. Refer to paragraph 7.14 for additional information.

7.3.3 Refer to paragraphs 8.3 PHOTOGRAPHS and 8.4 REFERENCE DOCUMENTS for additional information.

7.4 CLOSED CIRCUIT EVAPORATIVE COOLER:

Provide two (2) factory assembled and tested, forced draft counter flow closed circuit evaporative coolers, including but not limited to, fans, heat transfer coil, louvers, spray pump, electric basin heaters, basin water level control, rigging supports and accessories to provide a complete and operational system. Provide one unit in “left hand” configuration and the other unit in “right hand” configuration to provide common maintenance/service access between the units and outdoor air intake from opposite “outboard” sides. Each unit must meet or exceed the following performance requirements:

Condenser Water Flow: 205 GPM Condenser Water Entering Water Temperature (EWT): 101.8 degrees F.

Condenser Water Entering Water Temperature (LWT): 90 degrees F.

Outdoor Air Wet Bulb Temperature: 79 degrees F.

Maximum Coil Water Pressure Drop: 6.24 ft. water

Fluid: Water Voltage: 480 volt, 3-phase

7.4.1 Materials of Construction: Provide all panels, including the fan housings and supports, constructed of Type 316 Stainless Steel.

7.4.2 Fan(s): Provide forward curved centrifugal fans of hot dipped galvanized construction. The fans must be factory installed, and statically and dynamically balanced for vibration free operation.

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7.4.2.1 Fan Housing(s): Provide complete drive systems, including the electric motor, belts, bearings, fan, and drives that are completely enclosed in a protective housing which covers the drive system and provides sound reduction.

7.4.3 Drift Eliminators: Provide drift eliminators constructed entirely of Polyvinyl Chloride (PVC) in sections for ease of handled and service. Design shall incorporate three changes in air direction and limit the water carryover to a maximum of 0.001% of the recirculating water rate. Drift eliminators must be self-extinguishing, have a flame spread of less than 25 under ASTM E84, and shall be resistant to rot, decay and biological attack.

7.4.4 Water Distribution System: Provide spray nozzles constructed of precision molded ABS with large orifice threaded into branch piping with internal sludge ring to eliminate clogging. Spray header and branches must be schedule 40 Polyvinyl Chloride (PVC) for corrosion resistance.

7.4.5 Heat Transfer Media: Provide heat transfer coils constructed of elliptical tubes (Type 316 Stainless Steel), encased in stainless steel framework. The coil assembly shall be designed with sloping tubes for liquid drainage. Coil shall have design pressure of 300 psi and shall be in compliance with ASME/ANSI B31.5, Refrigeration Piping and Heat Transfer Components. The coil assembly shall be strength tested in accordance with ASME/ANSI B31.5 and subsequently leak tested using air under water.

7.4.6 Spray Pump: Provide EISA close-coupled centrifugal pumps with mechanical seals. The pumps must be installed in a vertical position so that water will drain from the pump when the cold water basin is emptied. Pump motor shall be totally enclosed with protective canopy for outdoor operation.

7.4.7 Bleed-off: Provide waste water bleed lines with a manual adjustable valves.

7.4.8 Air Inlet Screens: Provide protective screens over all air inlets.

7.4.9 Make up Float Valve Assembly: Provide make up float assemblies consisting of mechanical brass valves with an adjustable plastic floats.

7.4.10 Pan Strainer: Pan Strainer(s) shall be all Type 304 Stainless Steel construction with large area removable perforated screens.

7.4.11 Pipe Connection Type: Provide all connections beveled for welding. Provide dielectric connections for soldered/brazed connections to copper make-up water piping.

7.4.12 Basin/Sump Heaters: Provide copper element electric immersion heater(s) with separate thermostat and low water protection devices. Heater must maintain the basin/sump water temperature at least +40 degrees F. and a concurrent outdoor ambient temperature of 0 degrees F. with the fans(s) and spray pump off.

7.4.13 Discharge Hoods: Provide tapered discharge hoods (with dampers) constructed of 316 stainless.

Tapered discharge hood with damper assemblies are required to increase discharge air velocity and reduce heat loss through the coil in winter. Provide a large panel to allow access to the water distribution system and drift eliminators.

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7.4.14 Motors and Drives:

7.4.14.1 Fan Motors: Provide totally enclosed, ball bearing type electric motor(s) suitable for moist air service. Motor(s) must be minimum Premium Efficient, Class F insulated, 1.15 service factor design. Inverter rated per NEMA MG1 Part 31.4.4.2 and suitable for variable torque applications and constant torque speed range with properly sized and adjusted variable frequency drives.

Fan motor(s) shall include strip-type space heaters with separate leads brought to the motor conduit box.

7.4.14.2 Fan Drive(s): Provide V-belt type fan drives with quick detachable (QD) tapered bushings designed for 150% of the motor nameplate power. The belt material must be neoprene reinforced with polyester cord and specifically designed for evaporative equipment service. Belt adjustment must be accomplished from the exterior of the unit.

7.4.14.3 Fan Shaft(s): Provide tubular, ground and polished steel fan shafts with forged bearing journals. Exposed surface shall be coated with rust preventative.

7.4.14.4 Fan Shaft Bearings: Provide heavy-duty, self-aligning ball type bearings with extended lubrication lines to grease fittings located on the exterior of the unit.

7.4.5 Vibration Switch: Provide Vibration Cutout Switches, operating on 120 volt single phase AC feed, to protect the fan and drive assembly from damage in the event of excess vibration. Vibration switch shall be DPDT type.

7.4.6 Pipe Connection Type: Provide dielectric connections for soldered/brazed connections to copper condenser water piping

7.4.7 Maintenance Access:

Fan Section: Fan screens shall be removable for fan motor and drive access at grade.

Basin Section: Circular access doors shall be located above the basin to allow for easy access to pan interior.

7.4.8 Provide closed circuit evaporative cooler I-beam supports (hot dipped galvanized) size and length in accordance closed circuit evaporative cooler manufacturer requirements, including attachment to the equipment and concrete equipment pad.

7.4.9 Warranty:

7.4.9.1 The Entire Unit shall have a comprehensive five (5) year warranty against defects in materials and workmanship from date of shipment.

7.4.9.2 Fan Motor/Drive System: Warranty Period shall be Five (5) years from date of unit shipment from

Factory (fan motor(s), fan(s), fan shaft(s), bearings, mechanical support, sheaves, bushings and belt(s)).

7.4.9.3 Heat Transfer Coil: Warranty Period shall be One (1) year from date of unit shipment from factory.

7.5 CLOSED CIRCUIT EVAPORATIVE COOLER CONTROL PANELS:

Provide a control panel for each closed circuit evaporative cooler, field installed/attached to the closed circuit evaporative cooler) consisting of type 316 stainless steel NEMA 4X enclosures with factory installed controls (complete with all wiring, interlocks, contractor, fuses) to provide the means to provide local override of the associated closed circuit evaporative cooler for service/maintenance and repair with an interface with the Johnson Controls Inc. Metasys DDC system, including but not limited to:

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- Fan motor Variable frequency drive (VFD) with bypass and Fan

Drive/Off/Bypass selector switch

- Spray pump motor starter with Hand/Off/Auto selector switch

- Contactor(s) for basin/sump heater(s) with Off/Auto selector switch

- Make-up/water level controls

- Vibration cut-out control

- Discharge damper actuator motor control (with end switch)

- Fan motor(s) space heater control

- Panel enclosure ventilation fan and anti-condensation heater

- Indictor lights

- Master Enable/Off switch (with door interlock)

- Control transformer to provide 120 volt single phase power for controls

7.5.1 Surface mount these control panel to each closed circuit evaporative cooler in accordance with manufacture recommendations.

7.5.2 The enclosure shall be ventilated and heated to control panel internal temperature and humidity to provide stable VFD operation and system control.

7.5.3 Provide the control panel with a hinged door and quarter turn latches. The enclosure door shall include, but not limited to, the following switches and status indicator lights:

Switches:

MAIN DISCONNECT SWITCH ON/OFF (with door interlock)

FAN VFD DRIVE: RUN - OFF - BYPASS

SPRAY PUMP: HAND - OFF - AUTO

BASIN HEATER: OFF – AUTO

Indicator Lights:

FAN VFD DRIVE: RUN (Green) BY-PASS (Green) FAULT (Red) FAN VIBRATION: FAULT (Red)

SPRAY PUMP: RUN (Green) BASIN HEATER: ON (Green)

7.5.4 The closed circuit evaporative cooler controller shall include the following control:

7.5.4.1 Vibration Switch: When the vibration switch is engaged the closed circuit evaporative cooler fan

VFD shall be disabled and discharge air damper must close.

7.5.4.2 Fan Motor Heaters: Fan motor space heaters must be energized when the associated fan motor is off to prevent condensation in the fan motors. Fan motor space heaters must be switched off when the associated motor is running.

7.5.4.3 Upon a fall in the closed circuit evaporative cooler basin water temperature (below 40 degrees

F., adjustable), the basin water temperature sensor shall enable electric immersion heater once sensor in basin water level control proves immersion heater is completely submerged.

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7.5.4.4 Upon the rise in closed circuit evaporative cooler controller enclosed interior temperature, the enclosure space temperature thermostat shall enable enclosure ventilation fan.

7.5.4.5 Upon the fall in closed circuit evaporative cooler controller enclosed interior temperature, the enclosure space temperature thermostat shall enable enclosure condensation prevention heater.

7.6 BASIN (SUMP) EVAPORATIVE WATER TREATMENT SYSTEM:

Provide a water treatment system (one separate system for each closed circuit evaporative cooler or one system capable of independent treatment of closed circuit evaporative cooler) capable of automatically feeding chemicals and bleeding the system to prevent corrosion, scale, and biological formations. Automatic chemical feed systems shall automatically and independently feed chemicals into the evaporation water system of each closed circuit evaporative cooler based on varying system conditions.

7.6.1 Chemical Feed Pump: Provide one pump for each closed circuit evaporative cooler for each chemical feed tank. The chemical feed pumps shall be positive displacement diaphragm type.

The flow rate of the pumps shall be adjustable from 0 to 100 percent while in operation. The discharge pressure of pumps shall not be less than 1.5 times the line pressure at the point of connection. The pumps shall be provided with a pressure relief valve and a check valve mounted in the pump discharge.

7.6.2 Tanks: Provide chemical tank(s) constructed of high density polyethylene. The tanks shall have sufficient capacity to require recharging only once per 7 days during normal operation. A level indicating device shall be included with each tank. An electric agitator shall be provided for each tank.

7.6.3 Injection Assembly: Provide an injection assembly for each closed circuit evaporative cooler and compatible with each closed circuit evaporative cooler spray pump piping assembly. The injection assemblies shall be constructed of stainless steel. The discharge of the assemblies shall extend to the centerline of the condenser water piping. Each assembly shall include a shutoff valve and check valve at the point of entrance into the condenser water line.

7.6.4 Timers: Timers shall be of the automatic reset, adjustable type, and electrically operated. The timers shall be suitable for a 120 volt current. The timers shall be located within the water treatment control panel.

7.6.5 Water Treatment Control Panel: The control panel shall be a NEMA 12 enclosure suitable for surface mounting. The panel shall be constructed of stainless steel with a hinged door and lock.

The panel shall contain a laminated plastic nameplate identifying each of the following functions:

(1) Main power switch and indicating light

(2) MAN-OFF-AUTO selector switch

(3) Indicating lamp for bleed-off valves

(4) Indicating lamp for each chemical feed pump

(5) Set point reading for each timer

7.6.6 Chemical Piping: The piping and fittings shall be constructed of stainless steel suitable for the water treatment chemicals and outdoor slat corrosive environment.

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7.6.7 Sequence of Operation: The chemicals shall be added based upon sensing the make-up water flow rate and activating appropriate timers. A separate timer shall be provided for each chemical.

The blow down shall be controlled based upon the make-up water flow rate and a separate timer.

7.6.8 Test Kits: Provide one test kit of each type required to determine the water quality as outlined within the operation and maintenance manuals shall be provided.

7.6.9 Locate system in Building 345 Mechanical Room with piping extending out to the closed circuit evaporative coolers.

7.7 VARIABLE FREQUENCY DRIVE (VFD) CONTROLLERS (Condenser Water Pumps):

7.7.1 The existing VFD (manufactured by ABB, Inc.) serving condenser water pump #1 (10 HP, 460V, 3-phase) is existing to remain.

7.7.2 Demolish the VFD serving existing condenser water pump #2 (10 HP, 460V, 3-phase) and provide a new VFD similar to existing pump #1 VFD.

7.7.2.1 Provide a water pump variable frequency drive (VFD) unit with an integral HAND-OFF-AUTO (H-

O-A) switch. With the H-O-A switch in HAND position, the pump starts and runs continuously;

ensure pump speed is under manual-operator control. With the H-O-A switch in OFF position, the pump stops. With the H-O-A switch in AUTO position, run the pump subject to the Water Pump Start/Stop command and ensure pump speed is under control of the DDC system. When the condenser water system is enabled, modulate the pump variable frequency drive unit to maintain the pipe system pressure at set point, as measured by the differential pressure tap and sensor.

When the condenser water system is disabled, ensure the DDC Hardware capacity modulation output to the VFD is zero percent.

7.7.2.2 The variable frequency drive for water pump application must have the following features:

7.7.2.2.1 Provide local operator control including the following functions:

(1) Remote/Local operator selection with password access.

(2) Run/Stop and manual speed commands.

(3) All programming functions.

(4) Scrolling through all display functions.

7.7.2.2.2 Provide a local operator control panel with the following data displayed:

(1) VFD status.

(2) Frequency.

(3) Motor RPM.

(4) Phase current.

(5) Scrolling through all display functions.

(6) Fault diagnostics in descriptive text.

(7) All programmed parameters.

7.7.2.2.3 Provide a PI loop controller with input terminal for controlled variable and parameter settings.

7.7.2.2.4 Provide user interface terminals for remote control of VFD speed, speed feedback, and an isolated form C SPDT relay, which energizes on a drive fault condition.

7.7.2.2.5 Provide a VFD with adjustable carrier frequency with 16 KHz minimum upper limit.

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7.7.2.2.6 Provide a VFD with historical logging information and displays:

(1) Real-time clock with current time and date.

(2) Running log of total power versus time.

(3) Total run time.

(4) Fault log, maintaining last four faults with time and data stamp for each.

7.7.2.2.7 The VFD must be capable of automatic control by a remote signal via the DDC network command and manually by the VFD control panel.

7.7.2.2.8 VFDs must include the following operator programmable parameters:

(1) Upper and lower limit frequency.

(2) Acceleration and deceleration rate.

(3) Variable torque volts per Hertz curve.

(4) Starting voltage level.

(5) Starting frequency level.

(6) Display speed scaling.

(7) Enable/disable soft stall feature.

(8) Motor overload level.

(9) Motor stall level.

(10) Jump frequency and hysteresis band.

(11) PWM carrier frequency.

7.7.2.2.9 VFDs must have the following protective features:

(1) An electronic adjustable inverse time current limit with consideration for additional heating of the motor at frequencies below 45Hz, for the protection of the motor.

(2) An electronic adjustable soft stall feature, allowing the VFD to lower the frequency to a point where the motor will not exceed the full-load amperage when an overload VFD will automatically return to the requested frequency when load conditions permit.

(3) A separate electronic stall at 110 percent VFD rated current, and a separate hardware…