36C10E18R0165-002.docx

STATEMENT OF WORK

FOR

AIR HANDLING UPGRADES

GENERAL:

The contractor shall provide all labor, supervision, materials, equipment, cranes, electrical, electrical control motors, air purification systems, transportation and Bacnet controllers required to remove, replace and calibrate the roof mounted Air Handling Units 13-AHU1, 13-AHU2, 13-AHU3 & 13-AHU4 per attached specifications. The current sizes of the roof top units are 26,000 CFM, 11,000 CFM, 28,000 CFM, and 17,000 CFM. Service will be provided at the Veterans Affairs Regional Office, 1600 E. Woodrow Wilson Ave, Jackson Mississippi, 39216. The period of performance is 180 days from the issuance of the notice to proceed.

SCOPE OF WORK: Requirements

Replace Four Rooftop Mounted Air Handling Units 13-AHU1, 13-AHU2, 13-AHU3, & 13-AHU4: The system upgrade shall include: AHUs, chilled and hot water distribution piping, air distribution systems, insulation, building automation controls, dampers, grills, etc. AHU and SDVAV heating coil temperatures shall be less than or equal to ~ 140 degrees, Water-side pressure drop for heating and cooling coils shall not exceed 10 psig. Exhaust fans greater than 1 horsepower shall include an Electric Control Motor (ECM). Smaller exhaust fans shall include on/off relay. All exhaust fans shall be connected to the Schneider Building Management System to control building pressurization during low occupancy/unoccupied times.

PART 1: GENERAL

1.01 SECTION INCLUDES

Current Outdoor Air Handling Units Services building locations as identified herein:

13-AHU1 services the 1st and 2nd floor west, Trane Penthouse Climate Changer Model Number: PCCB-EECGBHT0BAAB0NC6AABAJCRC0CC00000EA00A00000B0

UGK 0E A0 00 0000 00 00 00000000S

Type Number: CPL 2997-1370-01 Serial Number: K96H74554

13-AHU2 services the 3rd floor west, Trane Penthouse Climate Changer Model Number: PCCB-C DC GB HC 0B AAB0KC 4AAB AFCR C0 CC00 00 0E A0 0A000A00000B0

UGL 7E A0 00 0000 00 00 00000000 S

Type Number: CPL 2997-1619-01 Serial Number: K96H73551

13-AHU3 services the 1st and 2nd floor east, Trane Penthouse Climate Changer Model Number: PCCB-EEC GB HU OB AA B0 NC 6AABA JCR C0 CC00 00 0E A0 0A000A 00000B0 UHH 4E A0 00 0000 00 00 00000000 S Type Number: CPL 2997-1620-01 Serial Number: K96H74205

13-AHU4 services the 3rd floor east. Trane Penthouse Climate Changer Model Number: PCCB-D EC GBHN 0A AAB0MD 5A AB AGDRC0CC 00 00 0E A0 0A 000A00000B0

UGM 4E A0 00 0000 00 00 000 000 00S

Type Number: CPL 2997-10379-01 Serial Number: K96H74881

1.02 REFERENCES

A. AFBMA 9 - Load Ratings and Fatigue Life for Ball Bearings.

B. AMCA 99 - Standards Handbook.

C. AMCA 210 - Laboratory Methods of Testing Fans for Rating Purposes.

D. AMCA 300 - Test Code for Sound Rating Air Moving Devices.

E. AMCA 500 - Test Methods for Louver, Dampers, and Shutters.

F. AHRI 410 - Forced-Circulation Air-Cooling and Air-Heating Coils.

G. AHRI 430 - Central-Station Air-Handling Units.

H. AHRI 435 - Application of Central-Station Air-Handling Units.

I. ASTMB117 - Standard Practice for Operating Salt Spray Apparatus.

J. NEMA MG1 - Motors and Generators.

K. NFPA 70 - National Electrical Code.

L. SMACNA - HVAC Duct Construction Standards - Metal and Flexible.

M. UL 723 - Test for Surface Burning Characteristics of Building Materials.

N. UL 900 - Test Performance of Air Filter Units.

O. UL 1995 - Standard for Heating and Cooling Equipment.

P. UL 94 - Test for Flammability of Plastic Materials for Parts in Devices and Appliances.

Q. IBC 2000, 2003 - International Building Code.

R. NFPA 90A - Standard for the Installation of Air Conditioning and Ventilating Systems.

S. NFPA 5000 - Building Construction and Safety Code.

T. ASHRAE 90.1 Energy Code.

U. AHRI Standard 1060 - Rating Air-to-Air Heat Exchangers for Energy Recovery Ventilation Equipment.

V. GSA 2003 Facilities Standard - 5.9 HVAC Systems and Components

1.03 SUBMITTALS

A. Shop Drawings: Indicate assembly, unit dimensions, weight loading, required clearances, construction details, field connection details, and electrical characteristics and connection requirements. Computer generated fan curves for each air handling unit shall be submitted with specific design operating point noted. A computer generated psychometric chart shall be submitted for each cooling coil with design points and final operating point clearly noted. Sound data for discharge, radiated and return positions shall be submitted by octave band for each unit. Calculations for required base rail heights to satisfy condensate trapping requirements of cooling coil shall be included.

B. Product Data:

1. Provide literature that indicates dimensions, weights, capacities, ratings, fan performance, finishes of materials, electrical characteristics, and connection requirements.

2. Provide data of filter media, filter performance data, filter assembly, and filter frames.

3. Provide manufacturer's installation instructions. All installation must meet ASHRAE standards.

1.04 QUALIFICATIONS

A. Manufacturer: Company specializing in manufacturing Air Handler products specified in this section must show a minimum five years’ experience manufacturing commercial Air Handlers.

1.05 SAFETY AGENCY LISTED & CERTIFICATION

A. Air Handling units shall be Center for Environmental Testing (cETLus) safety listed to conform with United Laboratory (UL) Standard 1995 and CAN/CSA Standard C22.2 No. 236.

B. Air Handler shall meet AHRI Standard 430.

C. Air Handling unit water heating & cooling coils shall meet AHRI Standard 410.

D. All warranty calls shall have an onsite manufacture representation within 2 hours of service call being placed during normal business hours.

1.06 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store, protect and handle products to site.

B. Accept products on site on factory-furnished shipping skids. Inspect for damage.

C. Store in clean dry place and protect from construction traffic. Handle carefully to avoid damage to components, enclosures, and finish.

D. An onsite storage area will be available for the Contractor to use. The Government does not take responsibility for damaged, theft or loss of equipment.

PART 2: PRODUCTS

2.01 ACCEPTABLE MANUFACTURERS

A. The following manufacturers have been predetermined to meet the HVAC salient features, experience, and support capacity to meet the government needs. Any other proposed brand must present additional documentation to be considered. Units listed below are in alphabetical order and not in order of preference:

1. Daikin Applied - Skyline

2. Haakon – Customer Outdoor Services

3. Temtrol – Outdoor Custom

4. Trane – Outdoor Performance Climate Changer

5. York – Johnson Controls Solutions Outdoor Air Handler

2.02 GENERAL DESCRIPTION

A. Configuration: In accordance with manufactures recommendation.

B. Performance: Conform to AHRI 410 and 430 Standards. (NOTE: Above does not apply to fan array) C. Acoustics: Sound power levels (dB) for the unit shall be certified by the manufacturer. The manufacturer shall provide the necessary sound treatment to meet a maximum of 64dB @ 63 Hz and no more than 51 dB @ 8000 Hz.

D. Outdoor Air Handlers: All roof top air handler’s units shall fit on the existing roof curbs. The contractor is responsible to verify the proposed AHU sill mount to the existing roof curb. There shall be no adaptor curbs provided for replacement of any outdoor air handling units.

2.03 UNIT CONSTRUCTION

A. Fabricate unit with heavy gauge channel posts and panels secured with mechanical fasteners. All panels, access doors, and ship sections shall be sealed with permanently applied bulb-type gasket.

B. Panels and access doors shall be constructed as a 2-inch nominal thick; thermal broke double wall assembly, injected with foam insulation with an R-value of not less than R-13.

1. The outer panel shall be constructed of G60 painted galvanized steel.

2. The inner liner shall be constructed of G90 galvanized steel.

3. Unit will be furnished with solid inner liners.

C. Module to module field assembly shall be accomplished with an overlapping, full perimeter internal splice joint that is sealed with bulb type gasketing on both mating modules to minimize on-site labor and meet indoor air quality standards.

D. Access doors shall be flush mounted to cabinetry, with minimum of two six-inch-long stainless steel piano-type hinges, latch and full size handle assembly. Access doors shall swing outward for unit sections under negative pressure. Access doors on positive pressure sections, shall have a secondary latch to relieve pressure and prevent injury upon access.

E. Provide cross broke roofcap system to divert water from the top surface of the air handler. The rain shed roofcap shall have 2”standing seams covered with splice cap channels to seal top seam. Splice cap shall break down over sides of standing seam to protect the ends of the seam.

1. Cooling coil piping vestibule shall be factory installed of standard cabinet construction on the coil connection side of the unit. Roofcap over vestibule shall be a continuous single piece covering both the coil section and the vestibule. Roofcap seams between coil section and vestibule are not allowed.

F. The unit shall have a 6-inch curb ready base for structural rigidity and condensate trapping in which fits on existing curb. The curb-ready base shall be manufactured with sloped drip pans located under all unit sections except duct openings and shall be supported by frame member.

G. An insulated, double-walled piping vestibule shall be factory installed of standard cabinet construction on the coil connection side of the unit. Roofcap over vestibule shall be a continuous single piece covering both the coil section and the vestibule. Roofcap seams between coil section and vestibule are not allowed.

H. Construct drain pans from 201 stainless steel with cross break and double sloping pitch to drain connection. Provide drain pans under cooling coil section. Drain connection centerline shall be a minimum of 3’’ above the base rail to aid in proper condensate trapping. Drain connections that protrude from the base rail are not acceptable. There must be a full 2’’ thickness of insulation under drain pan.

2.04 ELECTRICAL

A. The air handler(s) shall be ETL and ETL-Canada listed by Intertek Testing Services, Inc. Units shall conform to bi-national standard ANSI/UL Standard 1995/CSA Standard C22.2 No. 236.

B. Wiring Termination: Terminal lugs shall match branch circuit conductor quantities, sizes, and materials indicated. Enclosed terminal lugs in terminal box sized to NFPA 70. Specified by manufacturer.

C. Manufacturer shall provide ASHRAE 90.1 Energy Efficiency equation details for individual equipment to assist Building Engineer for calculating system compliance.

D. Contractor shall provide 20 AMP duplex exterior weatherproof GFI receptacle within 25 feet of unit to satisfy National Electrical Code requirements.

2.05 COOLING AND HEATING COILS

A. Certification: Acceptable water cooling, water heating, steam, and refrigerant coils shall be certified in accordance with AHRI Standard 410 and bear the AHRI label. Coils exceeding the scope of the manufacturer’s certification and/or the range of AHRI’s standard rating conditions will be considered provided the manufacturer is a current member of the AHRI Forced Circulation Air-Cooling and Air-Heating Coils certification programs and that the coils have been rated in accordance with AHRI Standard 410. Manufacturer must be ISO 9002 certified.

B. Water cooling coil shall be provided. Provide access to coil(s) for service and cleaning. Enclose coil headers and return bends fully within unit casing. Unit shall be provided with coil connections that extend a minimum of 5” beyond unit casing for ease of repair of equipment. Drain and vent connections shall be provided exterior to unit casing. Coil connections must be factory sealed with grommets on interior and exterior panel liners to minimize air leakage and condensation inside panel assembly. If not factory packaged, Contractor must supply all coil connection grommets and sleeves. Coils shall be removable through side and/or top panels of unit without the need to remove and disassemble the entire section from the unit.

1. Headers shall consist of seamless copper tubing to assure compatibility with primary surface. Headers to have intruded tube holes to provide maximum brazing surface for tube to header joint, strength, and inherent flexibility. Header diameter should vary with fluid flow requirements.

2. Fins shall have a minimum thickness of 0.0075 inch aluminum plate construction. Fins shall have full drawn collars to provide a continuous surface cover over the entire tube for maximum heat transfer. Tubes shall be mechanically expanded into the fins to provide a continuous primary to secondary compression bond over the entire finned length for maximum heat transfer rates. Bare copper tubes shall not be visible between fins.

3. Coil tubes shall be OD seamless copper, 0.020 inch nominal tube wall thickness, expanded into fins, brazed at joints.

4. Coil connections shall be carbon steel, NPT threaded connection. Connection size to be determined by manufacturer based upon the most efficient coil circuiting. Vent and drain fittings shall be furnished on the connections, exterior to the air handler. Vent connections provided at the highest point to assure proper venting. Drain connections shall be provided at the lowest point to insure complete drainage and prevent freeze-up.

5. Coil casing shall be a formed channel frame of galvanized steel.

2.06 FANS

A. The fan array will be arranged with high performance direct drive, single inlet, plenum fans with backwards inclined, high efficiency welded-aluminum or high performance composite impeller with galvanized or aluminum support frame. Manual blank-off plates shall be provided to block fan airflow, one plate to be provided per array. Backdraft dampers shall be provided to block fan airflow in lieu of blank-off plates.

B. The fans are driven by long-life, low-temperature brushless DC electronically commutated motor (EC-Motor) with external rotor and integrated maintenance-free electronic circuitry and electronics.

C. The motor is manufactured with maintenance-free, permanently lubricated ball bearings and shall be statically and dynamically balanced in accordance with ISO 1940 part 1.

D. The motor shall be closed, protection level IP 54, thermal class 155 with permissible operating temperature of -13°F to 140°F. Motor efficiency class shall comply with IE4. Fan characteristic curves indicate measurements on a chamber test in accordance with ISO5801. The three phase external rotor motor integrated into the fan hub meets the requirements for circulating electric machines set forth in DIN EN 60 034-1 (VDE 0530 Part 1).

1. Fan system manufacturer must stock replacement parts in North America.

2. The fan bulkhead wall shall be constructed in a manner for easy field assembly. All parts shall be sized to fit between a 30” doorway.

3. The factory mounted and wired single point power panel shall include an external disconnect. The panel shall be UL or ETL listed. The panel shall be provided with a BACnet compatible controller capable of monitoring the array’s airflow, total static pressure, power consumption, RPM, and individual fan alarm status and specific cause of alarm. Controller shall be configurable for fan speed control via BACnet interface (MSTP or IP), 0-10 VDC input, 4-20 mA input, constant airflow, or duct static pressure (static pressure sensor to be field provided and mounted). Control panel shall be equipped with relays for locking between other electrically driven components.

4. Fan assemblies shall be prewired with wire whips and plug connectors.

2.07 FILTERS

A. Furnish flat panel filter section with 2-inch pleated MERV 8 filter. Provide side loading and removal of filters.

B. Filter media shall be UL 900 listed, Class I or Class II.

C. Filter Magnehelic gauge(s) shall be furnished and mounted by others.

2.08 ADDITIONAL SECTIONS

A. Plenum section shall be provided and properly sized for inlet and/or discharge air flow (between 600 and 1500 feet per minute). The plenum shall provide single or multiple openings as shown on drawings and project schedule.

PART 3: EXECUTION

3.01 INSTALLATION

A. Install in accordance with manufacturer’s Installation & Maintenance instructions.

3.02 ENVIRONMENTAL REQUIREMENTS

A. Do not operate units for any purpose, temporary or permanent, until ductwork is clean, filters are in place, bearings lubricated, and fan has been test run under observation.

B. All new Bacnet controllers shall be Schneider™ compatible. Provide and install new network controller, AHU controllers, and terminal box controllers;

1. All control devices, sensors and meters shall report to Schneider™ Building Management System.

C. In areas where ductwork is replaced, replace all hot & cold potable water distribution lines beginning at the riser base and extending to the penthouse. Distribution lines on floor 2, and 3 shall be replaced in conjunction with the mechanical ductwork replacement. Lines to the fixtures shall be connected immediately adjacent to fixture above ceilings/below floors. The lines to the fixtures are not required to be replaced. Provide appropriate shutoff valves with permanent lacmoid labeling.

AIR PURIFICATION SYSTEM

PART 1 - GENERAL

1.1 DESCRIPTION OF WORK

A. This section describes the design, performance and installation of an air purification system intended for use as part of another manufacturer’s air handling unit or mounted on the duct as required.

1.2 REFERENCED CODES & STANDARDS

1.3 RELATED WORK

1.4 QUALITY and IP ASSURANCE

1.5 SUBMITTALS

2. Data sheet for each type of plasma generator, and accessory furnished; indicating construction, sizes, and mounting details.

3. Performance data for each type of plasma device furnished.

4. Indoor Air Quality calculations using the formulas within ASHRAE Standard 62.1- 2007 to validate acceptable indoor air quality at the quantity of outside air Scheduled (when projects are designed with outside air reduction).

5. Product drawings detailing all physical, electrical and control requirements.

6. Copy of UL 867 independent ozone test.

7. Copy of UL 2998 conformance certificate.

8. Statement on the manufacturer’s letterhead stating that the technology contains no titanium dioxide (Ti02).

B. Operating & Maintenance Data: Submit O&M data and recommended spare parts lists.

1.6 PRODUCT DELIVERY, STORAGE AND HANDLING

1.7 WARRANTY

A. Equipment shall be warranted by the manufacturer against defects in material and workmanship for a period of eighteen months after shipment or twelve months from owner acceptance, whichever occurs first. Labor to replace equipment under warranty shall be provided by the owner or installing contractor.

PART 2 - PRODUCTS

2.1 GENERAL

2.2 BI-POLAR IONIZATION DESIGN & PERFORMANCE CRITERIA

2. Velocity Profile: The air purification device shall not have maximum velocity profile.

b. Electrodes shall be provided in 6.0” (150mm) increments, epoxy filled for an IP55 rating and utilizing brass connection hardware that is recessed into the connection joint once fully engaged and assembled.

c. Electrodes shall be energized when the main unit disconnect is turned on.

d. The ionization output shall be a minimum of 60 million ions/cc per inch of cooling coil width as measured 1 inch from the cold plasma needles.

e. Ionization bars shall be provided with magnet mounting kits to prevent penetration into cooling coils.

f. Ionization bars shall be constructed of UL 94VO and UL746C composite material.

a. The Bi-polar ionization system shall consist of Bi-Polar Plasma Generator and power supply. The Bi-polar system shall be installed where indicated on the plans or specified to be installed. The device shall be capable of being powered by 24VAC, 115VAC or 208-230VAC without the use of an external transformer. Ionization systems requiring isolation transformers shall not be acceptable.

d. Each plasma electrode shall be made from an all composite, UL 94V0 and UL 746C rated material for prevention of corrosion and electrical insulation.

2. Ozone Generation:

a. The operation of the electrodes or Bi-polar ionization units shall conform to UL 2998 as tested by UL proving no ozone output.

PART 3 - EXECUTION

3.1 GENERAL

A. The Contractor shall be responsible for maintaining all air systems until the owner accepts the building (Owner Acceptance).

3.2 ASSEMBLY & ERECTION: PLASMA GENERATOR

3.3 TESTING

A. Provide the manufacturers recommended electrical tests.

3.4 COMMISSIONING & TRAINING

A. A manufacturer's authorized representative shall provide start-up supervision and training of owner's personnel in the proper operation and maintenance of all equipment.

4. UPDATE BUILDING MANAGEMENT SYSTEM: Provide and install all required controllers, software & hardware to the BMS to BACnet protocol at the unit level as well as the system level with WEB Based Interface.

(a) Install latest software improvements; include remote monitoring and notification capabilities. Check, calibrate and adjust BMS points for optimal, energy saving performance. Provide and install communication bridges for web-based HVAC monitoring and control. NOTE: The Building Management System will not be connected to the VA (Secure) Network.

(b) Install new Control Panel(s) and necessary Low Voltage Wiring (up to 50VAC). Migrate existing sequences of operation to new system. Install New Floorplan-Level, Equipment-Level, and Plant-Level 3D Graphics. Provide up to (4) total hours of Operational Training on the new Air Handler System. Provide all equipment manuals and part breakdown on new systems.

5. AIR BALANCE OF HVAC SYSTEM: Provide testing and balancing (TAB) of the air systems as well as hot and chilled water systems. The TAB contractor will ensure positive circulation control at each air handling unit allowing for more heat to be transferred out of the water on both hot & chilled water systems before return to the plant and ensure airflows are balanced and terminal boxes are calibrated. The TAB contractor shall be consulted prior to replacement of the hot and chilled water valves to ensure correct valve specification. TAB contractor shall work for the general contractor and be Associated Air Balance Council (AABC) - certified.

AABC Certified contractor to perform complete air-side balancing of HVAC system. This includes Air Handlers as well as VAV Boxes to ensure optimal performance. This includes but is not limited to:

1) Check, calibrate and adjust all variable-volume (VAV) box air flows, sensors and set points.

2) Test and modify HVAC sequence of operations to reflect the most efficient sequence while maintaining comfortable work environment.

3) Fine tune terminal unit, and air handling unit (AHU), for optimal performance. Put in place advanced airside economizer controls.

4) Setup AHU trends and alarms to notify operators when any system varies beyond normal efficiency parameters.

5) Test and verify all air distribution down to the diffusers level.

6) All Test and balance work will be performed by a certified AABC contractor.

6. Housekeeping:

(a) All work areas shall be kept clean and free of safety hazards.

(b) Contractor shall place visible signs indication hazard work zones.

(c) All trash shall be removed from the work areas throughout the day to avoid accumulation, and will be completely removed from the site at the end of the day.

(d) All work areas will be cleaned and trash removed before the facility opens for the next business day.

7. Security Requirements:

(a) All Contractors and Contractor personnel shall be subject to the same Federal security and privacy laws, regulations, standards and VA policies as VA, including the Privacy Act, 5 U.S.C. §552a, and VA personnel, regarding information and information system security.

(b) Each employee working in the Regional Office Building will be required to view a security Video (duration of 45 minutes) and sign a rules of behavior form.

(c) The Contractor will complete 20-0344 Annual Certification of Veteran Status and Veteran-Relatives form upon starting. If the contractor/relative is a veteran, the file will be housed in the Locked Files for the duration of the contract.

8. Key Personnel:

(a) A superintendent, authorized to make decisions and commitments on behalf of the contractor shall be required to be present on site when any work is being performed.

(b) The superintendent shall be named in writing and submitted to the Contracting Officer prior to beginning work.

Contractor Identification:

(a) All contract personnel attending meetings, answering Government telephones, and working in other situations where their contractor status is not obvious to third parties are required to identify themselves as such to avoid creating an impression in the minds of members of the public that they are Government officials. They must also ensure that all documents or reports produced by contractors are suitably marked as contractor products or that the contractor participation is appropriately disclosed. Badges will be required for this contract.

STATISTICAL INFORMATION:

Reports and Notifications:

(a) The Contractor shall notify the Contracting Officer and COR of any work delays immediately upon identification. If dangerous working conditions exist, the Contractor will notify the COR immediately.

Health and Safety Plan:

(a) The Contractor shall be solely responsible for risk assessments, managing health, and safety issues associated with this project. Based on hazard assessments, The Contractor shall provide or afford each employee personal protection equipment (PPE) that will protect the employee from hazards. At a minimum PPE shall consist of eye protection, hard hats, work gloves, hearing protection, safety boots, respirators, etc., IAW OSHA standards for all Contractor employees.

Work Schedule:

(a) The Contractor shall be required to perform all work in the 180 days performance period after the notice to proceed is issued. The Contractor shall provide all appropriate shop drawings, calculations, material samples, manufacturer’s data, etc., for all design submitted items. All substantial and/or finished materials must be approved before being installed by the Contractor.

Schedule and Progress Meeting:

(a) The Contractor shall prepare and submit a detailed project schedule and status through the use of Gantt charts and Critical Path Method (CPM) analysis. Task related to the procurement of long lead materials or equipment shall be included as separate activities in the project schedule. The project shall be monitored, and progress/status shall be reported weekly. Progress meeting minutes shall be submitted to the COR within three (3) business days of the progress meeting or when there is a schedule change.

Special Notes:

(a) The Government will not furnish any equipment to the Contractor under the terms of this contract.

(b) The Contractor will be issued Contractor Work Badges after signing a rule of behavior form and watching a required information security training video.

(c) Work vehicles can be parked in the gravel parking lot on the East side of the facility.

(d) The Contractor is authorized to have a temporary work/storage trailer on site if necessary.

Hours of Operation:

Normal Tenant Working Hours are: 6:00 am to 4:30 pm, Monday through Friday, excluding Federal holidays. "Normal Tenant Working Hours" are those hours on each official Federal workday during which the building occupants and/or the general public will be in the building(s).

WARRANTY:

A one (1) year warranty on all parts, materials, labor and workmanship is required after the project is completed and accepted by the Government.

DOWNTIME:

The facility is required to remain operational during normal business hours. It is required that most of the work be required to be performed after duty hours and/or on weekends to minimize impact on the mission of VARO Jackson and its employees and visitors.

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