Atch 1_Statement of Work_Prefabricated Greenhouse.docx

Attachment 1, 12639524R0011

STATEMENT OF WORK

Prefabricated Greenhouse (30’ x 96’) with 4 Bays

USDA-APHIS-PPQ, Science and Technology Insect Management and Molecular Diagnostics Laboratory – Edinburg TX

1.0 BACKGROUND

The United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS), Plant Protection and Quarantine (PPQ) Science and Technology (S&T) Insect management and Molecular Diagnostics Laboratory (IMMDL) – Edinburg TX, needs a prefabricated greenhouse to be furnished and installed for the purpose of rearing plants and insects.

2.0 SPECIFICATIONS

Site Preparation

Preparation of site encompasses the demolition and clearing of four existing greenhouses, inclusive of debris removal. Additionally, the project involves the construction of a four-inch concrete pad measuring 98 feet by 34 feet. This dual-phase preparation aims to create a cleared and level foundation, setting the stage for subsequent installation of greenhouse kit.

Material and Components

Structures shall be designed and detailed according to accepted engineering practices. The following material and components are required in to meet the needs of the program:

A. Frame

(1) Framing shall consist of trusses, hot dip galvanized after fabrication, on 12'‐0" centers spanning the full width of the structure with a 6/12 roof pitch. No castings, either of aluminum or aluminum alloy, shall be permitted for joining structural members at joints subject to stress in which tensile strength is a factor.

(2) Galvanized steel frame structure comprised of one (1) 30’ wide x 96’ long with 8’ sidewall, designed to have posts in piers, with posts 12’ oc with one bay 6’ oc, trusses, purlins, girts, bracings, gutters (with open ends) and hardware to make a complete frame. This includes four (4) 24’ wide (gable type) partitions placed at truss locations.

(3) Primary framing shall be 50,000 P.S.I. yield strength steel.

(4) Trusses shall be of 2" square steel tube (or heavier) with welded plate connections and hot dip galvanized after fabrication. Trusses shall ship from factory assembled in no more than two pieces ready to attach at the post connection. All tolerances shall be held to an absolute minimum to secure proper fit of the steel members.

(5) Truss support posts shall be 4" square steel tube (or heavier) furnished and placed at all truss bearing locations. Aluminum cast or aluminum alloy connectors are not acceptable.

(6) Trusses shall be connected to the side wall post by a welded post top connector hot dip galvanized after fabrication.

(7) Galvanized steel roof purlins, of size required, shall be prefabricated before delivery and installation.

(8) Provide all other structural members required to complete the framework of the greenhouse that are not mentioned above such as bracing, clips, lugs, girts, and fasteners.

(9) Secondary framing shall be extruded aluminum, members such as roof bars, ridge, sash, etc.

Members shall be mill finish, with appropriate heat treatment of alloy 6063‐T6 or 6063‐T5. Sheet aluminum shall be of alloy 3003‐h14.

B. Fastening System

All structural connections shall be attached with stainless steel fasteners. All aluminum to aluminum connections shall have aluminum or stainless-steel fasteners. All screws and self-tapping screws shall be stainless steel. Additionally, an extruded aluminum fastening system is required to attach 8mm polycarbonate on all roof and wall areas of one (1) 30’ x 96’ structure. Bars and caps must be spaced at 6’ oc.

C. Gutters

Gutters shall be 12-gauge steel fabricated for connection at the post tops, and also to accept roof and side wall glazing closures. Gutters shall be hot dip galvanized after fabrication. Outlet tube(s) shall be provided where indicated on the drawings.

D. Expansion and Condensation Control

All members shall handle expansion individually to prevent an accumulation of expansion in one direction from several members. Roof glazing bars shall incorporate condensation channels to conduct primary condensation to disposal points at gutter.

E. Glazing

There can be any combination of glazing or only one type listed below.

(1) Glass

All glass shall be 5/32 inch clear tempered. Roof and sidewall will be 3’ on center spacing and gable ends will be 2’ on center. All cut lites to be annealed glass except lites around doors. All glazing compounds used for bedding of glass shall be extruded butyl compound with a continuous built in shim. The glass shall be sealed on the outside with gun grade butyl glazing compound throughout the length before applying extruded aluminum bar cap.

(2) Acrylic double‐skinned sheets

8mm or 16mm Exolite No‐Drip® or equivalent. Material shall be glazed into an extruded aluminum gasketed system approved by the acrylic manufacturer and designed to provide for expansion and contraction.

(3) Polycarbonate Double‐skinned sheets

8mm or 16mm material shall be glazed into an extruded aluminum glazing system approved by the Polycarbonate manufacturer. Supplementary materials shall be compatible with Polycarbonate sheets. Expansion and contraction shall be provided for. Polycarbonate sheets shall have UV protection.

F. Vents

There can be any combination of vents or only one type listed below.

(1) Roof vents

Single or double run(s) of ridge vents shall be made up of a top rail, bottom rail and mullions of extruded aluminum and bolted together in accordance with manufacturer’s instructions. All vents shall have provisions made at the hinge point to prevent creeping of the vents. Vents shall be the size indicated on the drawings with a continuous socket hinge, arranged to open out. Vents for any given compartments, when assembled and installed, shall be continuous from one end to the other.

(2) Side vents

Single run of vents shall be made up of a top rail, bottom rail and mullions of extruded aluminum and bolted together in accordance with manufacturer’s instructions. All vents shall have provisions made at the hinge point to prevent creeping of the vents. Vents shall be the size indicated on the drawings with a continuous socket hinge, arranged to open out. Vents for any given compartments, when assembled and installed, shall be continuous from one end to the other.

(3) Gable vents

Single run of vents shall be made up of a top rail, bottom rail and mullions of extruded aluminum and bolted together in accordance with manufacturer’s instructions. All vents shall have provisions made at the hinge point to prevent creeping of the vents. Vents shall be the size indicated on the drawings with a continuous socket hinge, arranged to open out. Vents for any given compartments, when assembled and installed, shall be continuous from one end to the other.

G. Operators

There can be any combination of operators or only one type listed below.

(1) Rack and pinion arms

All vents shall be operated with rack and pinion system consisting of aluminum rack arm, aluminum housing and zinc pinion gear assemblies. Racks are attached to bottom rail of vents with aluminum clips and zinc plated steel cotter pins. No less than two sets of rack and pinion arms shall be provided for each 12’ section on vent. Provide 1.66" diameter galvanized drive shaft with 6 bolt connection couplings. Shaft hangers with nylatron bushings shall be provided to support roof and side/gable vent drive shaft.

(2) Elbow arm

All vents shall be operated with elbow arm system consisting of aluminum arm and aluminum rod assemblies. Arm assemblies are attached to bottom rail of vents with aluminum clips and zinc plated steel cotter pins. No less than two sets of rack and pinion arms shall be provided for each 12’ section on vent. Provide 1.66" diameter galvanized drive shaft with 6 bolt connection couplings. Shaft hangers with nylatron bushings shall be provided to support roof and side/gable vent drive shaft.

H. Automatic or Manual Machines

There can be any combination of machines or only one type listed below. Ventilators as indicated on drawings shall be operated by:

(1). Provide a manual machine with a hand crank or chain pull for each vent.

(2). Provide an automatic machine. The power unit shall be provided with a quick reversing single phase motor with sufficient power to operate the sash as required, complete with open and close limit switches.

I. Mechanical Components

· 4 ‐ 24’ Partitions Roof to Floor

· 8 ‐ 38” Aluminum Fans

· 8 ‐ TR 20 Trough and Pump

· 160 ‐ 5’ Cooling Pads, 6” thick

· 4 ‐ TF115 Single Speed Thermostat

· 400 L.F. Hardi Board installed as Kick Board on perimeter

· 70% Shade on Manual Sliding Rail

J. Doors

4 ‐ 36” Commercial Doors with Windows (1 door per greenhouse bay)

K. Flashing

All flashing and counterflashing shall be either aluminum or lead-coated copper.

L. Other

Each greenhouse bay will be supplied and undergo installation of essential components, including a water wall, a water pump, two circulation fans, and grow lights. Additionally, Wadsworth (or equal) controllers will be integrated to monitor and regulate various environmental parameters. This comprehensive setup ensures optimal conditions for plant growth and facilitates efficient control and management within each designated greenhouse bay.

Quality

The standard of quality for this greenhouse shall be R/S Series II rigid frame or an equivalent. All structures shall be designed to requirements of state/local building codes. Greenhouse structure(s) shall be designed in accordance with current AISI Specifications for Design of Cold ‐ Formed Steel Structural Members and AISC Specifications for Structural Steel Buildings. Greenhouse structure(s) shall include sufficient bracing for the resistance to wind forces. Bottom chord members as well as other truss members shall be adequate to resist compressive loads produced by horizontal wind loads and roof uplift produced by wind.

Training

Upon delivery of the greenhouse structures, the contractor must conduct on‐site training on the use of the greenhouses and systems. The contractor will also provide any operation and maintenance manuals to the Government.

Safety and Security (as needed)

The contractor shall comply with all established security policies at USDA and shall be escorted and always accompanied while at the facility. The contractor shall complete required paperwork for access to the facility.

Delivery

Delivery is 120 days after notice to proceed. FOB destination to the following address:

USDA APHIS PPQ ST IMMDL

22675 N Moorefield Rd Moore Air Base Edinburg, TX 78541

Government Point of Contact: james.g.roloff@usda.gov, 612-590-7603