ATTACHMENT 1 STATEMENT OF WORK.pdf

Mauna Loa Observatory Tower Foundation & Installation

Statement of Work (SOW)

Summary:

The NOAA Global Monitoring Laboratory (GML) Mauna Loa Atmospheric Baseline Observatory (MLO) is located on the Big Island of Hawaii, at 11,141 ft above sea level on the north flank of the Mauna Loa volcano. The site is often regarded as the “premier atmospheric science site on earth” and is home to numerous high-profile data sets including the “Keeling Curve” that first documented the rise in carbon dioxide in our global atmosphere. The observatory conducts well over 250 daily climatological measurements, some as precise as 1 part in a trillion.

The current sampling tower, located at MLO, was built in 1986 and stands 40m tall. It is an internal-climb, staircase-scaffolding, sampling tower and has platforms located every 6-feet.

Additionally, four of the platforms are outfitted with quad receptacle power outlets. There is no known structural damage to the tower itself, however the guy line anchor points are rusted, and the tower is over 36-years old and does not meet current code requirements.

The MLO facility is located at the end of an 18-mile one-lane access road reachable from Saddle Road. The start of the Mauna Loa Access Road is located just to the east of the more well-known access to the Mauna Kea Visitor Center and telescopes. Logistically, the site is at high-altitude and the sun (UV) conditions can be strong and the air temp significantly cooler than elsewhere on the island. The 18-mile driveway can be challenging for longer vehicles due to the narrow width, rolling topography, and occasional sharp corners. The power lines do cross over the road in multiple locations along the upper half of the MLO access road and may pose an overhead obstruction issue for very tall vehicles (no known issues with the powerlines obstructing access to the site historically). The one-way commute time to the MLO site from either Hilo or Kona typically takes ~90-min. *Currently, road access to the site is closed due to the Mauna Loa eruption in Nov/Dec of 2022. Approximately 1.1 miles of road and power lines were lost from the eruption and plans are underway to return to MLO as soon as possible. NOAA anticipates the road access (temporary dirt road) to the site will be re-established by Jan of 2024. Restoration of power to the site, other than a temporary PV system may be delayed until spring of 2024. Timing of this work is critical for other side-wide infrastructure projects and is expected to be completed as soon as possible after the road access is established.

Scientific measurements obtained at MLO often represent the global background conditions for the atmospheric research community. As such, the measurements taken at the site are highly precise and need to be safeguarded to ensure that indoor room air and/or local site contamination does note negatively impact the long-term records. NOAA has developed a comprehensive banned construction materials (chemicals) list and each product used at the site must be cleared against this banned chemical list prior to use. The banned construction materials list will be provided to vendors and NOAA can assist with reviewing individual products as needed.

Furthermore, it will be required to keep the science at MLO operational as much as possible throughout construction activities. For example, temporary power might be required and/or a phased approach to building modifications that allow for scientific systems to stay online to the greatest extent possible. All new construction work shall meet current code requirements.

Contract Line Item No. 01: Base contract: Tower Foundation Design

Design 40-m Tower Foundation

1. Furnish stamped and sealed (Professional Engineer Certified) tower foundation design requirements to allow the furnished tower to be installed on site.

a. Design shall meet all applicable reference standards and shall comply with

Federal, State and Local jurisdictional codes and requirements.

b. Design shall include tower grounding requirements and be tied into the site grounding infrastructure. Grounding requirements must include lightning protection.

c. New tower design has a footprint of 8’ per side (see attached tower drawings).

d. Design shall illustrate and include an 8’ tall, chain-link fence (~64 linear feet) around the perimeter of tower foundation and include barbed-wire top to deter public from accessing the tower. Fence shall also include one locking gate.

i. Design should include 4’ (minimum) space between the fence and each side of the tower.

ii. All fence materials must be galvanized.

e. Design shall include cable tray and walkway system from tower location

(exact location is TBD, but have an estimated area identified) back to Tower Science Building (~150’ linear feet).

i. Aluminum, ladder style, cable tray ~12” wide and 5.25” deep (specified on A0.1) to accommodate maximum use of the tower's cable/tubing management system at full capacity in addition to power/ground.

A. Ground based cable tray (horizontal) should integrate into the vertical cable tray on the tower and include a transition between the two trays. A gentle radius to transition cable/tubing between the two trays is required.

ii. Power and grounding to use this cable tray system to/from the tower location. Alternative is to bury the power and grounding in a trench if this technique is preferred by the contractor. If power and grounding is buried in a trench, the cable tray requirement is unchanged.

iii. All metal walkways should be 36” galvanized steel, heavy-duty, grip strut panels as specified on A0.1 and must be connected to the site grounding system.

Contract Line Item No. 02: Base contract: Tower System Installation

Install 40-m Tower system including foundations as shown on Contractor provided stamped and sealed plans.

1. Install:

a. Tower foundation and guy-line anchor points.

i. Post-installation - area around tower foundation and anchor points should be returned to match existing, pre-construction, terrain (grade and materials).

ii. No materials removed for the excavation and/or fill materials to remain on the ground after the installation is completed.

iii. All metal anchors embedded into concrete must be galvanized or stainless steel.

b. Tower structure and all guy-lines per manufacturer recommendations.

c. Tower grounding and lightning protection.

i. Connect tower systems to site-wide grounding infrastructure.

d. Fall arrest system per manufacturer recommendations.

2. Furnish and install:

a. Electrical outlets onto each of the tower platforms (two, quad outlets at each platform). Outlets on the tower should be on a separate circuit for each platform level. All electrical components to be located in conduit and using code-compliant outdoor-rated junction boxes, outlets, etc.

i. Outlets to be located on north and south sides of the tower (one each) at each platform railing height.

b. FAA-approved lights at 20m and 40m (assume these to be LED) on a dedicated electrical circuit for the lighting and connected to a battery backup (UPS) if available. All electrical components to be located in conduit and using code-compliant outdoor-rated junction boxes, outlets, etc.

i. Lighting to be installed on the west side of the tower at each height.

c. Circuits to be connected to the breaker panel located in the tower science building. Tower circuits (outlets and lighting) already accounted for in this breaker panel. Connection/route from cable tray/trench into building and breaker panel to be coordinated on site.

d. Cable tray and walkway from tower to Tower Science building (~150 linear ft).

i. Aluminum, ladder style, cable tray ~12” wide and 5.25” deep (specified on A0.1) to accommodate maximum use of the tower's cable/tubing management system at full capacity. The power/grounding for the tower should not be run in this cable tray and must be kept separate either in a dedicated metal conduit or buried.

1. Ground-based cable tray should terminate at/below vertical cable tray mounted to the tower. A gentle radius to transition cable/tubing between the two trays is required.

(vertical cable tray into the horizontal cable tray).

2. Cable tray should be supported on the ground from the tower location to approximately 50’ from the tower science building. The cable tray should then remain ~level or slightly downhill for the last ~50’ into the tower science building to allow the cable tray to enter the tower science building ~8’ above the finish floor height of the building.

Provide all support structure needed for this last 50’ of cable tray to transition from the ground to this height.

Note, tower science building will have a small retaining wall ~2’ in height on the uphill side of the building, thus the cable tray will need to be ~6’ above the ground to enter the building at the required height above floor. Final heights to be confirmed when tower science building is completed.

3. Intent is for a continuous downhill slope in the cable tray from the base of the tower to where it enters the tower science building. Any “low spots” are locations where water can accumulate in the tubing and must be avoided.

4. Cable tray to be terminated at the exterior wall of the tower science building.

ii. All metal walkways should be 36” galvanized steel, heavy-duty, grip strut panels as specified on A0.1 and must be connected to the site grounding system.

1. Tower cable tray and walkway will be adjacent to one another near the tower and then likely diverge so cable tray is routed to the tower science building and the site walkway path follows the ideal route for foot traffic.

2. Walkway to be terminated at/near tower science building.

Exact location TBD and should be located to best facilitate foot traffic around the site (and specifically between the tower and the tower science building).

e. Chain link fence (8’ height) with barbed wire top and gate, all galvanized materials, around the tower base (~64 linear ft).

i. Include all footers required for complete security fence installation.

ii. Space between the bottom of fencing and the ground must be 4” or less at all points to keep the tower secure and ensure it is not possible to climb under the fencing.

iii. Metal walkway should access the tower via the gate in the fencing and terminate at the edge of the concrete footer for the tower foundation.

iv. Cable tray should pass through the fencing. The fence edges around the tray should be secure and free from sharp metal that could potentially injure staff while working in the cable tray.

v. Gate should swing outward (away from the tower) for access.

Contract Line Item No. 03: Option - Conductive Concrete

Conductive Concrete:

1. Provide conductive concrete for tower foundation slab to create an Ufer ground in lieu of standard concrete mix.

a. Conductive concrete contains carbon and/or steel fibers.

b. Prior to pouring concrete, install copper cabling to the reinforcement steel

(rebar) to bond the concrete pad to the site grounding system.

c. Ensure that copper cabling is protected from damage where it exits concrete.

d. Connect copper ground to the site grounding system.