The vendor is required to provide that automated weather observing system (AWOS) currently installed and to be replaced will be kept in operation until commissioning of the new system to minimize loss of airport location weather reporting.
- Contractor duties:
• Excavate obsolete concrete piers.
• Removal of obsolete sensor tower.
• Verify location of any existing utilities above and below ground.
• Contractor to completely understand the design. this includes installation of equipment and structures the foundation is designed for.
• Notify department immediately for any unforeseen site conditions such as, but not limited to, presence of corrosive soils, shallow ground water, or inadequate site drainage.
• Verify the size of the foundation to match equipment size, anchorage and installation before construction.
• all construction must be in accordance with international building code (IBC) 2018 unless permitted by Mesotech otherwise.
• Verify base plate hole size and spacing before start of construction.
• Use leveling and locking nuts as necessary.
• Grade to drain away from foundation at 2% to at least 5 feet in all directions.
• Slope top of foundation at 1/4" per foot for drainage.
• Coordinate with owner for top of concrete elevation.
• Verify the load bearing capacity of the soil at least 1500 psf.
• Structures and equipment may be installed on the foundation no earlier than 14 days after pouring concrete.
• The bottom of the footing must be below frost depth per local site conditions.
• Backfill accidental over excavation with concrete or with clean sand and thoroughly compacted in 8-inch layers.
• Foundation designs assume field inspection will be performed by the owner to verify that construction materials, installation methods, and design parameters are accepted based on the conditions existing at the site.
• Work must be in accordance with local codes, safety regulations and unless otherwise noted, the latest revision
of american concrete institute (ACI) 318, "building code requirements for reinforced concrete."
• Procedures for the protection of excavations, existing construction and utilities must be established prior to foundation installation.
• Concrete materials must conform to the appropriate state requirements for exposed structural concrete.
• Reinforcement must be deformed and conform to the requirements of american society for testing and materials (ASTM) a615 grade 60 unless otherwise noted.
• Splices in reinforcement must not be allowed unless otherwise noted.
• Reinforcing cages must be braced to retain proper dimensions during handling and throughout placement of concrete.
• Minimum concrete cover for reinforcement must be 3 inches unless otherwise noted.
appropriate spacers must be used to insure a 3-inch minimum cover on reinforcement.
• Foundation designs assume structural backfill to be compacted in 8-inch maximum layers to 95% of maximum dry density at optimum moisture content in accordance with american society for testing and materials (ASTM) D698.
• Additionally, structural backfill must have a minimum compacted until weight of 100 pounds per cubic foot.
• Care must be given to the ensure proper backfilling around each of the piers. contractor must show verification of compaction specifications during backfilling.
• Where significant “settling” occurs around the piers within the first year, the contractor must return to the site and add additional fill and seeding as approved by department aeronautics.
• Foundation designs assume level grade at the site.
• exposed edges of concrete must be chamfered 3/4" x 3/4".
• No telecommunications required at AWOS tower.
• All piers to be 72" or greater below grade.
• All soils must be compacted and inspected by qualified geotechnical consultant.
• Contractor to supply department project manager with construction procedures for sono-tube design, soil compactions and installations.
• Tower foundations base must be leveled plum with laser.
• All sensor piers pipes must be leveled plum with laser.
• Tower must not be erected until federal communications commission (FCC) antenna structure registration (ASR) is obtained. contact department project manager for verification.
• Tower must not be erected and lit until utility power is present.
solar obstruction light to be provided if power is not immediately available.
• Install dual l-810 obstruction lights kits on top of AWOS tower.
• Contractor to dispose of obsolete AWOS tower, foundations, associated equipment, and materials.
• Expected timeline from issuing a purchase order or a notice to proceed to final completion of the project at a location is 30 days.
• Weather impacts may cause delays, but completion of a project must not extend past 60 days with without written explanation and approval by department aeronautics.
• Contractor will update department aeronautics weekly at minimum. communication via microsoft teams is preferred.
• Seven (7) days prior to any pouring of concrete at a location, the contractor must inform department aeronautics to allow the department project manager time to schedule travel and lodging so departments present on the day of the concrete pour and installation.
• Contractor will allow for site observation of the project to be conducted by department either in person or though virtual inspection utilizing software such as apple facetime.
• Department aeronautics reserves the right to install a camera(s) to the construction site to track the progress of the construction.
• The camera will have the ability to take still shots or 24 hours, 7 days of the week live video stream.
• All electrical inspections, permits, and fees are to be included and not a separate line item.
• There will be a rough-in inspection of the underground piping, and a 2nd trip inspection required after the department aeronautics technicians have mounted the hardware and made final connections.
• If a 3rd electrical inspection is needed, it will be at the expense of the contractor unless approved in writing by department aeronautics.
- Owner obligations:
• Department aeronautics project manager will coordinate scheduling and project notice to proceed.
• Department project manager to inspect tower foundations prior to concrete delivery.
• Department project manager to inspect all grounding prior to backfill.
• Department project manager to inspect h-frame and conduits run prior to backfill.
• Department project manager to finalize construction inspections.
• AWOS sensors will be installed by department.
• department aeronautics, in coordination with the consulting engineer, will conduct the 1a survey for the north marker.
• AWOS final commissioning to be coordinated by department and federal aviation administration (FAA).
• A final inspection will be completed by department aeronautics and the consulting engineer to determine results.
• Plans and specifications will be reviewed to ensure the correct materials, techniques, and installation codes were followed.
- Contract Period/Term: 2 years
- Questions/Inquires Deadline: March 06, 2025