Attachment 1_PWS_1305M320QNWWP0036.pdf

Performance Work Statement (PWS)

Replace HVAC - Weather Forecast Office (WFO)

Brownsville, TX.

Background:

The National Weather Service (NWS) Weather Forecast Office (WFO) Brownsville, TX (BRO) HVAC systems need replacement. The existing systems are beyond their useful life due to age and are inefficient.

Objective:

Replace operations area Heating Ventilation Air Conditioning (HVAC) split system (2) 20-ton HVAC Air Conditioning Unit (ACU) (model 38AKS024) and (1) 8-ton HVAC ACU (model 30AKS009) and all associated equipment for the three (3) split systems shall be replaced. NWS WFO is an active operation, HVAC disruption must be minimized to allow for sustained operations. The government may award one or more tasks. A pre-bid site visit is highly recommended. It is the responsibility of the contractor to inform himself of all existing issues with the HVAC System.

Scope:

Task 1 – HVAC Building Load Calculations

Contractor will calculate the heating and cooling loads of the operations and administrative areas. Load calculations will be done according to Air Conditioning Contractors of America (ACCA) Manual - N, Manual - D, and Manual - S. Based on load calculations contractor will propose two HVAC solutions. An onsite review of existing systems and units is required to perform load calculations at this site. Contractor shall submit load calculations and proposed solutions to NWS for review.

Task 2 - Replace HVAC Split System AHU/ACU #’s 1 & 2 (Operations Area)

Replace both Split direct expansion (DX) Refrigerant Systems – Air Cooled, Air Conditioning Units 20-ton (ACU-1&2 model 38AKS024 and AC1- 39LA1121AB1031-R) with intertwined Evaporator Coils. New Units will have matching ACU’s and matching Air Handling Unit’s (AHU) or equivalent. New units shall, use R410A refrigerant, include low ambient kits, and hail guards for the condensing units. Replace refrigerant set lines and components to match new condenser unit and air handler. Work includes all required services for delivery and installation of the new units, as well as removal and replacement of the existing HVAC Systems. New units will be Energy Star Certified. All units will have factory installed corrosion coatings. All exterior electrical piping shall be rigid galvanized piping to seal tight flexible conduit. Insulate all copper piping to industry standards. Contractor is required to include any electrical system changes, and integrate operations with (existing or upgraded) Direct Digital Control (DDC). Existing DDC is Tridium system using Siemens products on a Niagara AX Framework. Contractor’s Control and Test and Balance (TAB) sub-contractors shall work with NWS 3rd party commissioning agent. Contractor shall submit 90% drawings and phasing plan for review and replacement. Contractor shall minimize down time of HVAC. This is turn-key effort within the scope of this contract.

Task 3 - Replace HVAC Split System AHU/ACU #3 (Administrative Area)

Replace Split DX Refrigerant Systems – Replace Split DX Refrigerant System – Air Cooled, 8-ton Air Conditioning Unit (ACU-3 model 30AKS009 and AC1- AC3- 39LB1061AB1021-L).

New Units will have matching ACU/AHU and will have intertwined Evaporator Coils. New units shall, use R410A refrigerant, include low ambient kits, and hail guards for the condensing unit. Replace refrigerant set lines and components to match new condenser unit and air handler. Air Handler shall have existing evaporator coil and expansion valves replaced with R410A compatible coils and valves. Work includes all required services for delivery and installation of the new unit, as well as removal and replacement of the existing HVAC System.

New unit shall be Energy Star Certified. All units shall have factory installed corrosion coatings. All exterior electrical piping shall be rigid galvanized piping to sealtight flexible conduit. Insulate all copper piping to industry standards. Contractor is required to include any electrical system changes, and integrate operations with (existing or upgraded) DDC. Existing DDC is Tridium system using Siemens products on a Niagara AX Framework. Contractor shall work with NWS 3rd party commissioning and TAB agent. Contractor shall submit 90% drawings and phasing plan for review and replacement. Contractor shall minimize down time of HVAC. This is turn-key effort within the scope of this contract.

Task 4 – Existing DDC Upgrade

Upgrade existing Direct Digital Control (DDC) System. The existing DDC is Tridium Niagara AX Framework on a Widows 7 PC, using Siemens controller products with Kele sensors. As-builts for the equipment and sequence of operations available upon request. Contractor shall upgrade hardware and software as needed to run on Windows 10 PC. Provide 4 hours of BAS training upon completion.

Task 5 – HVAC Duct Cleaning

Clean and Sanitize all supply and return registers. Clean all supply plenums and sanitize with Fosters 40/80 anti-bacterial disinfectant or equal. Coat all insulated trunk lines, supply and returns, with I.A.Q.A. 8000 anti-microbial protective coating. Clean all round and flex duct with mechanical brushes and negative air pressure. Fog entire work area with Fosters 40/80 or equal to eliminate settled spores present.

Place of Performance:

National Weather Service Forecast Office 20 S Vermillion Brownsville, TX 78521

Project Warranty:

Contractor shall provide a written warranty for the installed system for a period of (1) one for year parts and (1) one year for labor from the date of acceptance.

Performance Requirement Summary:

Task Performance Objective Acceptance Quality Method of Surveillance Technical Report

Submittal Final and complete technical report

No later than required by schedule + 1 day

Review Report

Load Calculations Load Calculations for Brownsville WFO

In accordance with appropriate ACCA manuals

Review Calculations

HVAC Installation All work installed during

POP

Install according to manufacturer’s recommendations

Inspection

Controls System Update, Test and

Balance

TAB and Control Point to Point verification as well as Functional testing accepted during commissioning

No more than 5% of verified HVAC units/control points require adjustments.

Commissioning

Training 4 Hours of Training Training completed per schedule

Trained Staff Review

Disposal Dispose of material as required

Dispose of material as required

Contractor to certify disposal

Additional Compliance

A. Compliance.

The Contractor shall comply with all local, state, and Federal environmental, health, and safety regulations while conducting this work. In addition, the Contractor shall ensure that all work complies the applicable, current codes and be responsible for all licenses, permits and fees required to complete this project. Typical codes are referenced here:

Occupational Safety & Health Standards (OHSA) Safety Requirements Uniform Building Code (UBC) Uniform Facilities Criteria (UFC) American National Standards Institute (ANSI) American Society of Testing & Materials (ASTM) American Society of Heating, Refrigerating, and Air-conditioning Engineers (ASHRAE) Sheet Metal & Air Conditioning Contractor’s Association (SMANCA) Applicable local, states, and federal codes and standards Energy Star Certification Program

B. Construction Waste Disposal.

The Contractor will be required to properly remove and dispose of all waste material. Follow applicable industry standards in the management of waste. Apply sound environmental principles in the management of waste. (1) Practice efficient waste management when sizing, cutting, and installing products and materials and (2) use all reasonable means to divert construction waste and demolition debris/waste from landfills and incinerators and to facilitate the recycling or reuse of excess construction materials.

C. Guidelines.

The project shall follow the guidelines stated in the PWS, site diagrams, blueprint, and any contractor provided quoted documents. All modifications must be submitted and approved by the Contracting Officer.

D. Hours of Operation.

Work shall be performed between 7:00am & 5:00pm Central Time Monday thru Friday unless otherwise approved by the COR. Contractor agrees to observe all Federal Holidays, and any other day off work designated by Federal Statute, Executive Order, or Presidential Proclamation:

New Year’s Day, Labor Day, Columbus Day, Veteran's Day, Thanksgiving, Christmas, Memorial Day, Presidents Day, Independence Day & Martin Luther King Day.

E. Facility Access.

A Project sign in sheet shall be completed each day for all contractors, contractor employees and sub-contractors on site.

F. Government Contact.

The Contracting Officer Representative (COR) will serve as the Government’s point of contact for all submissions.

G. Documents.

The Government does not warrant that any documents provided as attachments to be free from discrepancies, ambiguities, errors, omissions, or changing conditions. It is the responsibility of the Contractor to confirm existing conditions and resolve discrepancies between documents.

SAFETY AND EMERGENCY PLAN:

A. The Contractor shall observe and institute all applicable Occupational Safety and Health Administration (OSHA) safety requirements and procedures to prevent accidents and injuries to both Contractor and Government employees including 40 CFR 1926 Subpart M for fall protection requirements.

B. The Contractor shall designate one person as Safety Coordinator for purposes of communication between the Contractor and the National Weather Service COR at time of award.

C. Contractor shall provide a Safety Plan and Procedure to protect employees from being injured while on the job site. Submit plan to the CO and COR for review and approval.

D. Contractor shall provide an Emergency Plan and Procedure to provide immediate care for an employee injured while on the job site. Submit plan to the Contracting Officer for review and approval.

GOVERNMENT PROVIDED MATERIALS AND/OR SERVICES

A. EXCLUSIONS:

Unless otherwise indicated elsewhere in this PWS, the Government will provide no data, materials, equipment and/or services to the Contractor. Any and all research required to fulfill the PWS described herein, shall be the responsibility of the Contractor. The Government retains the right to request the Contractor to acquire additional information on behalf of the Government.

B. WARRANTY:

The Government does not warrant that any documents provided as attachments to be free from discrepancies, ambiguities, errors, omissions, or changing conditions. It is the responsibility of the Contractor to confirm existing conditions and resolve discrepancies between documents.

C. SUBMITTALS:

Shall be sent to Contracting Officer Representative (COR) for final review and acceptance.