Attachment A Scope of Work - Brownsville Public Utilities ...

BPUB i SCADA Yard Tower

Power System Engineering, Inc. Scope of Work

Attachment A – Scope of Work

Table of Contents

1 SCADA Yard Tower Specifications and Scope of Work ........................................................2 General Tower Compound Project Summary ...................................................................2

New Tower Requirements .................................................................................................3 Tower Foundation Design .................................................................................................5 Shelter Information ...........................................................................................................5 Soil Analysis .....................................................................................................................5

Cable Bridge ......................................................................................................................5 Site Grounding ..................................................................................................................5

1.7.1 Site Grounding Rings ...............................................................................................5 1.7.2 Tower, Cable Bridge, and Shelter Grounding .........................................................6

Tower Compound Site Pre-Construction Preparation .......................................................6 Tower Compound Site ......................................................................................................6

2 Existing Tower Removal .........................................................................................................7

Existing SCADA Yard Tower Location and Structure Type ............................................7 SCADA Yard Tower Removal Scope of Work ................................................................7

3 Contractor Safety Requirements ..............................................................................................8

4 Existing Site Photographs ......................................................................................................10

Tables

Table 1: Proposed Tower Loading ...................................................................................................4

Figures

Figure 1: Existing Tower and Shelter Overall ...............................................................................10 Figure 2: New Tower Location – Northeast Edge .........................................................................11

Figure 3: New Tower Location - Southwest Edge.........................................................................12 Figure 4: Cable Entry for Existing Site..........................................................................................13

Figure 5: Existing Equipment in Shelter ........................................................................................14 Figure 6: Existing Cable Entry ......................................................................................................15 Figure 7: Existing Shelter Ground Bar ..........................................................................................15 Figure 8: Existing Tower, Upper Antennas ...................................................................................16 Figure 9: Existing Tower, Mid Height Antenna ............................................................................17

BPUB 2 SCADA Yard Tower


1 SCADA Yard Tower Specifications and Scope of Work

General Tower Compound Project Summary

The Brownsville Public Utilities Board (BPUB) requires a new 199-foot tower located at 25° 55'

39.50" N97° 27' 53.81"W. The new tower will be located at the BPUB operations yard campus

1425 Robinhood Dr, Brownsville, TX as shown in the figure below. Additional site photographs

are included in Section 4.

This tower proposal will include:

1. Self-supporting lattice tower and foundation

a. Note: solid rod and solid steel members preferred; hollow tubing members are not

preferred

2. Approximately 50’ long cable bridge between tower and existing shelter

3. Supply and install 4 X 4 4” standard building entry port assembly on existing shelter

4. Tower and shelter grounding system, compliant to Motorola R-56 specifications

5. Supply and install antennas and associated feedline

6. Provide feedline and system antenna sweep tests using Anritsu Site Master or approved

equivalent test instruments



BPUB is looking for a tower company (Seller) to provide a turnkey installation of the new tower,

antenna, and feedlines. The role of the Seller shall be to provide material and services to deploy

and commission the new tower. All materials shall be provided by the Seller.

Exhibit 1 will provide a recent geotechnical report that the Seller will use for designing the

materials and services for this Project. Please note that this exhibit will be issued as an Addendum

as soon as it becomes available (anticipated January 15, 2021).

Detailed roles of the BPUB and Seller for this Project are provided in the Responsibility Matrix.

Seller shall be responsible for:

• Site preparation.

• Providing the specified tower.

• Designing and installing specified tower foundations.

• Furnishing and installing all associated hardware and appurtenances.

• Performing all planning and installation of the tower.

• Removal of existing 160’ tower after completion of new tower installation and

commissioning

• Site restoration and cleanup.

Seller shall also be responsible for ensuring that the tower and shelter installations meet all design

criteria, labor services, guarantees, and installation requirements contained in these specifications,

or in national or the industry standards referenced in this specification.

BPUB will receive approval for this tower from the Brownsville City Council. BPUB will provide

all NEPA, FCC, and local permitting required for this tower. The Seller will provide FAA filings.

New Tower Requirements

Tower: The tower shall be a 199-foot self-supporting communications tower. The BPUB is

requesting an unlit tower of 199 feet, meaning the overall height of this tower including the

foundation projection is allowed up to 199 feet. No tower attachments, including lightning

protection shall be higher than 199 feet above ground level (AGL).

Materials: Hot-dipped, galvanized steel, or stainless steel. All steel materials used in the

construction of the towers shall be new, and shall conform to the provisions of ANSI/TIA-222 Rev

G and Rev H with respect to physical properties, manufacture, workmanship, and factory finishes.

Tower design documents submitted shall clearly show design parameters matching both

ANSI/TIA-222 RV G & Rev H.



Climbing Ladder/Pegs: The tower shall include a climbing ladder that begins at 18 feet from the

ground. The ladder shall include an approved safety climb system. The tower shall also have

provisions to prevent climbing by unauthorized persons.

Loads and Stresses: The design of the tower shall take into account dead and live loads induced

by the structure itself and all appurtenances, and all stress applied to the tower and its

appurtenances by wind forces. The minimum safety factors listed on ANSI/TIA-222 Rev G and

ANSI/TIA-222 Rev H , Structure Class III, Exposure Category C shall apply under the most severe

combination of dead load plus live loading.

Antenna & Transmission Line Loading: The towers shall be designed to support, at minimum,

the antennas and transmission lines shown in the table below. It is desired that initial loading does

not exceed 70% of the available tower capacity.

Table 1: Proposed Tower Loading

Antennas specified in this RFP are to be provided by Seller. Seller shall provide attachment stand-

offs, install the stand-offs and antennas, and provide and install transmission line from antennas

into shelter.

Tower Mount

Height (Feet)Antenna Name Antenna Type Azimuth Stand Off Cable Type

Part of Initial

BuildNotes

Top Beacon Light Obstruction Lighting Omni None Power Cable Yes

180 SCADA DB809DK-Y Omni 3'

1 5/8" Heliax, AVA-7-

50 or approved

equivalent, 2 Runs

Yes

1608ooMHz LMR/

SCADA SpareDB809DK-Y Omni 3'

2 5/8" Heliax, AVA-7-

50 or approved

equivalent, 2 Runs

No

1406 sector Ubiquity 19

dBi

Ubiquiti Titanium

M50,60,120,180,240,300

Mount to leg with

small sector mount

field fabricated with 2"

pipe & appropriate

pipe to pipe clamp sets

Ubiquity Tough Cable

(Cat-V) 6 runsYes

Antenna is similar to dimensions of

AM-5AC21-60 for wind loading.

1206 sector Ubiquity 19

dBi

Ubiquiti Titanium

M530,90,150,210,270,330

Mount to leg with

small sector mount

field fabricated with 2"

pipe & appropriate

pipe to pipe clamp sets


(Cat-V) 3 runsno

Antenna is similar to dimensions of

AM-5AC21-60 for wind loading

903 sector Cambium

600

Cambium 600

Integrated radio &

antenna

0,120,240

Mount to tower leg

using pipe to pipe

clamps and

intermediate mast if

needed


(Cat-V) 6 runsno

80 2' DishUbiquiti Rocket Dish

M50

Apropriate mount for

proposed tower / dish

combination


(Cat-V)Yes


M5120



combination


(Cat-V)no


M5240



combination


(Cat-V)no

20 Roberto Vargas GateUbiquiti NANO

Stations 5 GHzUnknown

Mount to tower leg

using pipe to pipe

clamps and


needed


(Cat-V)Yes

20

900 MHz Unlicensed

AMI Takeout Point

Collector

Ubiquiti NANO

Stations 2.4 GHzUnknown

Mount to tower leg

using pipe to pipe

clamps and


needed


(Cat-V)Yes



This installation shall include sweep testing the antennas and cables during the installation and all

cable grounding and bonding as required by BPUB.

Tower Foundation Design

The tower foundation and anchor bolt designs shall be designed to the ANSI/TIA-222-G and

ANSI/TIA-222-H standard. Foundation design documents submitted shall clearly show design

parameters matching both ANSI/TIA-222 Rev G & Rev H. The foundation design shall be based

on the BPUB-provided geotechnical specifications as found in Exhibit 1, which will be issued as

an addendum when it becomes available in January 15, 2021. All concrete loads shall have core

samples taken and tested by the Seller to verify the concrete strength meets the specifications.

Shelter Information

A communications shelter is currently in place near the existing tower. The Seller shall install a

cable bridge cable support assembly between the new tower, and the existing shelter. The Seller

shall install a new entry port assembly on the existing shelter near the current cable entry location

and terminate the cable bridge at this point. The Seller shall install a ground ring around the shelter

in conjunction with the ground ring around the tower. All grounding shall meet Motorola R-56

standards, as well as National Electrical Code (NEC) requirements.

Soil Analysis

Soil geotechnical analysis is being performed by the BPUB. Seller shall use this analysis in the

design of the tower foundations. A copy of the soil report prepared by the geotechnical engineering

firm will be provided as Exhibit 1.

Cable Bridge

The Seller shall provide a cable bridge between the tower and shelter. The cable bridge shall be

approximately 50 feet in length.

Site Grounding

1.7.1 Site Grounding Rings

The ground system shall comply with the Motorola R-56 grounding specification and the National

Electric Code (NEC). This Site requires a tower ring and a shelter ring with the two rings connected

in accordance with the R-56 specification. The ground system shall be installed by Seller but will

be left uncovered until inspected and approved by BPUB or their Authorized Representative. All

below grade ground connections shall be exothermic welds. All above grade connections can be

irreversible compression fittings.

Seller shall measure the ground system resistance using the three-point voltage-drop method and

provide the results as part of the as-built documentation. The resistance measurement shall be

lower than 5.0 Ohms, or the Seller shall remedy prior to backfilling the rings.



1.7.2 Tower, Cable Bridge, and Shelter Grounding

Once the tower is installed, the Seller shall provide a tower grounding bar at the base of the tower

that connects to the tower ground ring using exothermic welds.

Seller shall provide master ground bars inside and outside of shelter cable entry port and associated

connections to the shelter ground ring in accordance with R-56 standards using exothermic welds.

The cable bridge shall be grounded to both rings using exothermic welds.

All bolted ground lugs on ground busses shall have two-hole lug attachments. All hardware shall

be stainless steel. All grounding installed by the Seller shall be compliant to the Motorola R-56

Grounding standard and the National Electric Code (NEC).

Tower Compound Site Pre-Construction Preparation

The existing site is grass covered flat ground. The new tower will be adjacent to the existing tower

and structure as shown in the pictures in Section 4 below. The site allows for access by digging

equipment for the foundation and access by a crane for tower installation. No additional

preparation is needed.

Tower Compound Site

The area around the tower will be finished with a weed barrier covered by gravel or crushed stone.

Seller shall remove all excess soil and gravel used during the site preparation from the BPUB

property. See photographs in Section 4 for more site information.



2 Existing Tower Removal

BPUB requests separate pricing for the removal of the existing BPUB-owned SCADA Yard

Tower. The existing tower has been inspected and maintained on a continual basis. As of the last

inspection the existing tower is considered unfit for service.

It is desired that all antenna attachments be removed for future reuse as much as practical.

The existing tower structure is located approximately 75’ from the site of the proposed new tower.

BPUB will provide access as needed for the work.

Existing SCADA Yard Tower Location and Structure Type

City Location: BPUB operations yard campus

Street Address: 1425 Robinhood Dr, Brownsville, TX

GEO Location: Latitude 25° 55' 39.50", Longitude 97° 27' 53.81"W

Ground ASL: Tower base approximated at 30’ above sea level

Type: Unknown Rohn style; Possibly 45 or 55 series

Height: 160 ft. guyed.

Fabricated: Unknown

Operational: Unknown

Registration: None found; Unknown

SCADA Yard Tower Removal Scope of Work

1. Contractor to dismantle the existing tower, including the tower structure and all associated

hardware and remaining fixtures. This includes:

• Guy wires, anchors, and associated hardware

• Any remaining cabling and mounting hardware

• Lamping and associated mounting hardware and wiring

2. Contractor to remove and dispose of all tower structure elements and above listed material.

3. Contractor to excavate, remove, and dispose of all guy wire anchors.

4. Contractor to excavate, remove, and dispose of tower concrete foundation.

5. Contractor to fill any excavations with material approved by BPUB and finish rough grade to

match adjacent grade and finish.

6. BPUB will file appropriate notices with the FCC regarding tower registration and relocation

of applicable frequencies.



7. Contractor to determine appropriate coordination as required with the FAA, FCC, and other

agencies as may be applicable for decommissioning lighting system prior to dismantling of the

structure, establish, and work within schedule.

8. Contractor shall coordinate timing with BPUB for completing the electrical disconnect with

appropriate time window for decommissioning lighting system.

3 Contractor Safety Requirements

BPUB will advise of known hazards in the vicinity of the work area prior to commencing work.

BPUB expects that the contractor will be competent and perform all work independently and

safely. However, BPUB will order all work to stop if any safety infractions or concerns are

observed. Work shall not resume until the issue has been resolved in a manner acceptable to BPUB.

Contractor must identify a responsible and competent person as the safety liaison prior to

commencing work. It is preferred that one person will perform this function for the entire project.

If the safety liaison person must be substituted, all work must stop until such time as the new

liaison is on site and has BPUB has been notified of the change and new contact information.

All work must be done safely and in accordance with all OSHA and state regulations.

BPUB requires submission of a JSA (Job Safety Analysis) form prior to commencing work. A

sample of the BPUB form is attached as Exhibit 2. The contractor can use their own form if it

provides the same information as the BPUB form. These forms must be submitted regularly

throughout the project.

Contractor is required to conduct daily safety meetings prior to the start of the workday and as

appropriate throughout the workday as may be warranted by changing tasks or newly identified

risks. Logs of these meetings and briefings shall be kept and made available for inspection by

BPUB officials or their appointed agents

Due to the COVID pandemic, all contractors must submit a COVID-19 safety plan designed to

keep the contractor and BPUB employees safe and minimize exposure to the Covid-19 virus. This

must be submitted prior to commencing work.

Restroom facilities will not be provided by BPUB. All contractors must provide portable sanitary

restroom and handwashing stations.

Access to BPUB buildings is restricted to BPUB personnel and essential contractors with a specific

task that requires entry.

All personnel working onsite are required to present a valid government ID for access.

All contractor personnel working above ground level shall be appropriately trained and certified

by an industry recognized organization, such as Comtrain. Current and valid training certificates



for all personnel shall be available for inspection prior to starting onsite work and be available for

inspection on demand by BPUB or its agents at any time during work operations.

Contractors are expected to have their own comprehensive safety and rescue plans in place. A copy

of the safety plan must be submitted to and approved by BPUB in advance of commencing work.



4 Existing Site Photographs

Figure 1: Existing Tower and Shelter Overall



Figure 2: New Tower Location – Northeast Edge



Figure 3: New Tower Location - Southwest Edge



Figure 4: Cable Entry for Existing Site



Figure 5: Existing Equipment in Shelter



Figure 6: Existing Cable Entry

Figure 7: Existing Shelter Ground Bar



Figure 8: Existing Tower, Upper Antennas



Figure 9: Existing Tower, Mid Height Antenna

Attachment A Scope of Work - Brownsville Public Utilities ...

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