HomeMy Public PortalAbout2016 Underground Utilities Feasibility Study by WGIVillage of Key Biscayne
Underground Utilities
Feasibility Study
Prepared for:
Village of Key Biscayne
Prepared by:
IIIWGI.
August 20L6
Village of Key Biscayne
Underground Utilities Feasibility Study
TABLE OF CONTENTS
INTRODUCTION...........
UTILITY PROVIDERS...............,....
PROIECT SCOPE AND OTHER CONSTDERATTONS...
BENEFITS OF UNDERGROUNDING ...................
POTENTIAL CHALLENGES AND 1IA8I1ITIES.....,..............
COORDINATION WITH CAPITAL IMPROVEMENTS
OPINION OF PROBABLE COSTS...
PROIECT SCHEDULE 1L
FUNDING SOURCES,.. ...........11
ALTERNATIVES TO UNDERGROUNDING .............,..12
LIST OF APPENDICES
Page
1,0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10,0
L
2
3
5
7
B
9
AppendixA:
Appendix B:
Appendix C:
Appendix D:
Appendix E:
Appendix F:
Appendix G:
Appendix H:
Appendix I:
Appendix f :
Appendix K:
Aerial Location Map
FPL Overhead Facilities Map
Existing Infrastructure Map
Project Schedule
Opinion of Probable Costs Worksheet
f oint Use Trench Details
Power Service Conversion
Power Details
Communication Details
Existing Street Lighting
Glossary
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Underground Utilities Feasibility Study
1.0 INTRODUCTION
The Village of Key Biscayne contracted with Wantman Group Inc. (WGIJ to deliver a
Feasibility Study for the proposed underground conversion of the existing aerial utility
facilities within an area of the Village, The area studied is depicted on the Location Map in
Appendix A. The area being studied includes 1,143 single family homes, multifamily,
government, commercial, office, institutional and recreational uses. The Village of Key
Biscayne is approximately 1.3 square miles, of which approximately one half the total area
is being studied.
The purpose of this study is to outline the factors in determining the feasibility, potential
costs and schedule associated with converting the existing aerial facilities to underground.
A conceptual underground conversion design has not been developed. Detailed system
maps showing the existing aerial and underground utility facilities were not available for
this study.
The study area is currently served by aerial utility facilities, The affected utilities include
Florida Power and Light for power [FPL), and AT&T and Comcast for communication
fcollectively referred to as the utility owners). Within the study area Florida Power and
Light has approximately 4.5 miles of aerial feeder, and approximately 9.8 miles of primary
laterals. The underground conversion effort will be a collaboration of the Village and the
utility owners, FPL, AT&T and Comcast. The underground conversion of the existing aerial
facilities will significantly reduce the current service disruptions and outages caused by
tree contact, wildlife, lightning, adverse environment [salt spray), vehicular accidents,
weather and high winds. The benefits of undergrounding the aerial facilities are
enumerated later in this report.
The timing of the proposed underground conversion effort is critical in that Florida
Power and Light is currently planning a system-wide hardening proiect anticipated
to begin in 2018. The proposed hardening proiect will replace the existing poles
with the larger diameter Class 1 concrete poles that are 5 feet higher and would be
more disruptive to rear-yard installations. The hardening proiect will also place
additional in-line poles throughout the system. Although much less so, hardened
above ground systems are still vulnerable to adverse weather, vegetation and flying
debris.
Understanding of electric power delivery systems. To help understand the issues
associated with burying a power delivery system, it is important to be familiar with the
various components of the system from the substation [at north end of the Village) to the
individual meter. Power leaves the substation along two main north/south feeders, The
north/south feeders follow Harbor Drive and Fernwood Road / Crandon Boulevard (refer
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to the Location Map AppendixA). Branching off the main distribution feeders are primary
laterals that typically run along rear lot lines to pole mounted transformers. Secondary
lines take power from the transformers to a service drop at each property, the majority of
which are aerial. The service drop extends from the secondary power line to the meter.
The proposed underground distribution system would be composed of feeder cables from
the existing substation to switch cabinets located throughout the Village. Primary cables
from the switch cabinets would then bring power to the pad mounted transformers. Each
pad mounted transformer would provide underground service to approximately 6 to B
residences, depending on the size and electrical load at each residence.
2,0 UTILITY PROVIDERS
The following Companies were identified through a Sunshine 8L1" Design Ticket. Inquiries
were made to confirm the presence of any additional companies with a utility interest in
the Village of Key Biscayne, with aerial facilities on the existing FPL or AT&T pole lines.
The utility providers and companies with facilities within the Village include:
America Traffic Solutions - Supports traffic control within the Village of Key Biscalme
[red light camerasJ. American Traffic Solutions has facilities at the following intersections:
Crandon Boulevard at Harbor Drive, Crandon Boulevard at Key Colony, and Crandon
Boulevard at Galen Drive. Facilities are typically in the right-of-way by Agreement with the
local or county municipality.
AmeriGas DBA Siegel Gas - Provides propane gas to customers within the Village of Key
Biscayne. Facilities are typically not found within public rights-of-way. Anticipate minor
impacts limited to the private property service conversions.
AT&T Florida - Provides communications service to private, public and institutional
customers within the Village of Key Biscayne. AT&T's services are regulated by the Public
Service Commission. The majority of the existing AT&T facilities are aerial. The majority of
the residential properties are feed from the rear lot lines. For this report we assume the
facilities placed within public right-of-way are in the right-of-way by permit.
Comcast Cable - Provides communications service to private, public and institutional
customers within the Village of Key Biscayne. Comcast's services are regulated by the
Public Service Commission. The majority of the existing Comcast facilities are aerial. The
majority of the residential properties are feed from the rear lot lines. For this report we
assume the facilities placed within public right-of-way are in the right-of-way by permit.
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Dade County Public Works and Traffic - Provides traffic control facilities within the
Village of Key Biscayne. Facilities include buried and aerial interconnect cable connecting
the existing traffic signals within the Village.
Florida Power and Light (Distribution) - Provides primary and secondary power
service to private, public and institutional customers within the Village of Key Biscayne.
FPL's services are regulated by the Public Service Commission. The majority of the existing
FPL facilities are aerial. The majority of the residential properties are feed from the rear lot
lines. For this report we assume the facilities placed within public right-of-way are in the
right-of-way by permit.
Florida Power and Light (Transmission) - Provides high voltage power to the substation
at the north end of the Village of Key Biscayne. These facilities will not be included or
impacted by the proposed underground conversion.
Hotwire Communications - Provides communication service to The Sands within the
Village of Key Biscayne. Hotwire's facilities are regulated by the Public Service Commission.
Hotwire's facilities are buried within public rights-of-way. For this report we assume the
facilities placed within public right-of-way are in the right-of-way by permit.
Miami-Dade Water and Sewer - Provides water and sewer service to private, public and
institutional customers within the Village of Key Biscayne. For the purpose of this report
we assume the facilities placed within public right-of-way are in the right-of-way by permit.
The Miami-Dade Water and Sewer Department concern on this project is the protection of
their existing underground facilities. A "best praciices" approach would require their
mains and services be mapped prior to the underground conversion design phase.
3.0 pRolEcT scopE AND 0THER CONSIDERATIONS
This report considers the removal of all aerial facilities and poles within the subject area.
These facilities will be replaced by buried conduit and cable, buried at-grade service pull-
boxes and splice boxes, as well as surface mounted facilities, including; above ground pad
mounted transformers, switch cabinets, fuse cabinets, capacitor banks, fiber termination
cabinets and pedestals. Said surface facilities will be connected by conduit and cable within
a joint utility trench. All existing aerial services to existing properties will be buried and all
private property services must be converted to underground. All properties will receive
connections to both of the communication providers, AT&T and Comcast.
All underground facilities, other than services, will be placed in public right-of-way. If
suitable right-of-way is not available, an easement will be acquired within private property.
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Early in the design process, it is critical to determine locations where easements will be
required for the above ground facilities installed within private property. Acquisition of
the subsequent easements will require the consent of the property owner. The Village shall
record and furnish all easements necessary, including legal descriptions of such easements
prior to initiating construction.
This report considers the possibility of a utilizing a joint use trench for the common
installation of all utility facilities within the same trench. foint use utility trenches are
common practice currently being used in underground conversion projects in South
Florida. The joint trench installation is a more efficient use of the right-of-way width and
will reduce manpower costs and the overall construction duration. The result of the joint
trench is an overall cost savings to the project system installation. The trenching and
conduit installation will be performed by the Village to control the schedule and costs, and
to minimize the duration and number of construction activities in an area. The placing,
pulling and final connection of services will be performed by the respective utility owner,
The assumed method of installation is open trenching. Directional bores will be used to
cross Crandon Boulevard and in areas where open excavation is impractical. For this
purpose it is assumed the utilities will require conduit rather than direct buried cable;
conduit is preferred for maintenance purposes and will allow for future upgrades to the
systems. During the design phase the Village should consider the installation of additional
conduits that could be used in the future and eliminate the need for future excavations.
The joint use utility trench will be constructed with the appropriate clearances to existing
underground facilities (for example, water, sewer and drainage). If appropriate clearances
are not available the project may require the relocation of those conflicting facilities. The
joint utility trench is assumed to fall within the roadway swales to limit pavement
restoration, expedite installation and reduce traffic impacts.
In addition to the joint use trench, the underground conversion project will include the
installation of a number of above ground facilities. Photos and details of the typical above
ground facilities can be found in the appendix. FPL will require approximately 50 switch
cabinets, 200 pad mounted transformers and additional fuse cabinets and capacitor banks.
AT&T and Comcast will require approximately 250 pedestals and additional termination
cabinets. The actual quantities of facilities listed above will be determined during final
design.
Easements will be required if public right-of-way is not available. The size of required
easements may vary depending on the equipment and the availability of right-of-way and
roadway clear zone requirements, A typical FPL switch cabinet will require a 20' x 20'
easement. Each FPL transformer, fuse cabinet and capacitor bank will require a 10' x 10'
easement. Feeder and primary splice boxes are typically located within available right-of-
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way, however, if right-of-way is not available the splice box will require additional
easements. Each feeder splice box will require a 7' x I0' easement. FPL has limitations on
landscaping in front of the access panel of all above ground equipment. The proposed
underground conversion project criteria should include a plan to mitigate adverse impacts
to the existing landscaping and other improvements within the right-of-way or easements
on private property.
The conversion will be an underground loop system which will increase reliability
by creating multiple supply routes to more than one transformer. This would allow
only a portion of the loop to be out of service in the event an outage, thereby
reducing the extent of the outage and the restoration time.
The existing overhead roadway street lighting is owned by FPL and consists of typical
open bottom style lighting on existing FPL poles. Since the FPL poles will be removed with
the underground conversion, the Village may consider a relighting program, which will
include the installation of new roadway lighting to replace the existing FPL street lights to
be removed. The Village will have the option of using Village ovrrned lighting (customer
owned), or FPL installed lighting. The relighting is not considered in this report. Various
areas within the Village are currently planning the installation of additional customer
owned street lighting. Current street lighting programs should be delayed pending
resolution of the undergrounding conversion. Any existing customer owned street lights
in place at the time of the undergrounding will have to be removed or refed from the new
underground service.
The potential benefits of design-build delivery were considered. In general the nature of
the proposed work/design does not lead itself to design-build delivery. Each utility owner
will require a direct agreement with the owner (the Village of Key Biscayne) and will not
participate or contract with a design-build firm. In addition, each utility owner will set
their design standards and require the connections and installations of proprietary
equipment be self-performed, that is by their own crews. This is contrary to a typical
design-build delivery, where the design-build firm will try to cut costs though the design
and installation, neither of which is allowed by the utility.
4.0 BENEFITS OF UNDERGROUNDING
The benefits of the utility underground conversion are subjective and may be difficult to
quantif,i. The benefits associated with utility underground conversion project include:
a. Improved utility reliability [a reduction in service outages)
b. Improved life, personal and property safety. Continuity of electric service will
enhance the overall health and safety of the community, providing continued service
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to critical facilities such as the sanitary sewer and storm water pump stations, traffic
signals, schools, shelters, and other municipal and governmental buildings
c. Continuity of electric service will enhance the overall health and safety for
individuals who require electrically powered home health equipment, and personal
and property safety around the house or at work obviously enhanced by lighting
and electrically-powered equipment and facilities.
d. Improved aesthetics and community enhancement (including positive effects on
quality of life)
e. Reduced risk associated with electrical hazards including downed power lines or
tree trimming
f. Fewer vehicle impacts with poles
g. Promotes a more desirable community
h. Increasedpropertyvalues
i. Environmental benefits from an overall greater tree cover. Opportunities for rear
yard landscaping not currently available with the existence of overhead facilitiesj. Reduced vegetation management and costs associated with continued tree trimming
k. Eliminates extensive restoration efforts after catastrophic storm events.
L Eliminates evacuation delays due to downed power lines across evacuation routes.
m. Eliminates preplanned outages of aerial facilities due to maintenance, new
construction and installations that would otherwise require de-energizing the aerial
facilities.
n. Eliminates the upcoming FPL hardening project which would add larger diameter
rear-yard poles and further disrupt existing rear-yard settings
The following was taken from the Longboat Key Utility Underground Conversion
Proiect Question and Answer website:
Q: What results have other Towns/Cities/Local governments reported relative to outages
after the FPL facilities have been relocated underground.
A: The Town of Jupiter Island on the east coast of Florida reported that they had experienced
no interruptions on the island since the underground conversion was completed December of
2009. They have power monitors located around the island due to pre-conversion outages and
they closely monitor the new system.
The mayor of Jupiter Inlet Colony stated in a meeting with the Palm Beach IJndergrounding
Taskforce on Tuesday, July 7, 2015, that since the completion of their conversion in 2010, they
have experienced one intercuption that lasted less than a minute, Trees, animals, and salt
contamination were the primary causes of outages and all have been eliminated.
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The following was taken from a 2006 study by the Municipal Underground Utilities
Consortium, a group of Florida Cities and Towns. Included in the study as a review of
the benefits provided after completion of maior underground conversion efforts on
four barrier islands along the North Carolina coast. Brunswick Electric Membership
Corporation (BEMS) provides power service to communities in North Carolina.
BEMC's underground conversion project was completed in 2004. Since then it has been
exposed to many storms similar to those frequently encountered in Florida, and it sustained a
direct hit from Tropical Strom Ernesto in 2006. In qualitative terms, BEMC senior
management reported the following results:
o Reduced number and duration of outages due to lightning, animals and other contacts
o Elimination of problems associated with salt sprayt e.g. transformer and hardware
corrosion and short circuiting due to salt accumulation
o Significant reduction in restoration time and costs,
o Elimination of nearly all right-of-way tree-trimming and clearing costs
o Elimination of all clearance and maintenance problems that had been associated with
overhead rear lot line construction.
Oak Island was predominantly an overhead electric q)stem prior to the underground
conversion project completed in 2004. Oak Island and the adjacent islands of Ocean Isle,
Holden Beach and Sunset Beach have been hit by storms since the undergrounding project,
and have all experienced reduced outages and restoration time. During Tropical Storm Ernest
(2006), Oak Island experienced no outages due to its new underground facilities. BEMS
experienced 4,000 outages, all on inland overhead portions of their system. BEMC reports "to
this point we have not experienced any real negatives from the underground conversion
philosophy. I think it is safe to say that we all agree it was the right direction to take."
5.0 POTENTIAL CHALTENGES AND LIABILITIES
The challenges associated with utility underground conversion project:
a. Requires a large initial capital expenditure and must address potential for resident's
unwillingness to pay,
b. Construction duration and inconvenience to residents and businesses.
c. Physical constraints within the right-of-way and unforeseen conflicts during
construction.
d. Easements may be required for the above ground equipment and residents aversion
to those facilities on their property, potential litigation associated with easement
acquisition.
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e. Coordination with property owners for the conversion of their services, potential
for damage claims and litigation related to service entrance conversions and
restoration.
f. Removal of existing landscaping and improvements that conflict with the proposed
underground conversion.
g. Requires new street lighting to replace the existing overhead FPL lighting. The
new lights may be provided by FPL, or new customer owned street lighting may be
provided. Existing customer owned lighting currently served from underground
power will be either removed or refed from the new underground facility, at the
discretion of the Village.
The liabilities associated with underground utility facilities installation and maintenance
include:
a. Potential increase in repair time for service outages.
b. Repairs to underground facilities may require excavation within private property.
c. Services are nowburiedto the house,
d. Restrictions to landscaping and improvements around the improvements and
within the provided easements. Transformers and switch cabinets are pad mounted
above ground, and although FPL does allow some landscaping, access to these
facilities cannot be infringed by landscaping or other improvements,
e. Ground mounted equipment is susceptible to severe storm surge and flooding.
f. Increased costs associated with subsequent installation or modification for future
services and expansion, potential impact on competitive advantage.
The proposed underground conversion project should include a plan to mitigate adverse
impacts to the existing landscaping and other residential improvements within the right-of-
way or provided easement. This may include an approved "remove and restore" provision.
6.0 COORDINATION WITH CAPITAT IMPROVEMENTS
Where practicable the proposed underground conversion project will be coordinated with
previously identified capital improvement projects, so as to eliminate the need to repair
and restore areas that would otherwise be damaged by the undergrounding scope.
Necessary projects that involve the public health and welfare should commence on
schedule, regardless of the undergrounding scope or schedule. Projects that aren't deemed
necessary to the public health and welfare may be delayed and/or coordinated with the
underground conversion, at the discretion of the Village. The list of projects the Village
may choose to delay, include those projects that do not involve underground construction,
those projects that would normally commence after the underground work is completed.
This would include sidewalks, pavers, resurfacing, bike lanes, crosswalks, street lighting
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traffic calming, landscape, streetscape, signage and pavement markings. Projects the
Village may choose to coordinate with the underground conversion would include those
proiects with an underground component. This would include storm water, drainage,
water and sewer. Water and sewer projects will be coordinated with Miami-Dade Water
and Sewer Department. All the above listed projects can be accomplished concurrent with
the utility conversion, but the addition of these projects are not mandatory, with the
possible exception of sidewalk, resurfacing and street lighting. A recommendation is
made to delay any sidewalk, resurfacing and street light improvements until after the
underground conversion is completed. Areas currently planning street light
improvements include Harbor Drive from Sunset to Mashta, Mashta Drive from harbor to
Crandon, and Fernwod Road from Westwood to W. Heather.
A recommendation is made to study the existing drainage systems and coordinate the
design and installation of resulting drainage improvements with the underground trench
design and construction. The drainage work may be performed concurrent with the joint
trench installation, either by the joint trench contractor, or in coordination with the joint
trench contractor. Miami-Dade Water and Sewer Department should be contacted to
address any potential coordination with planned or anticipated water and sewer work.
7.O OPINION OF PROBABLE COSTS
One of the most challenging aspects of the project is the development of the cost estimate.
Many of the project variables that will impact the ultimate project cost are difficult to
quantifii, including the individual property owner's cost to convert and connect to the
underground system. The service entrance connections and costs are specific to that
individual property. The costs associated with the acquisition of suitable easements, and
the costs to mitigate the other existing utility facilities [water, sewer and drainage) are
likewise difficult to quantif,i.
Florida Power and Light currently offers a 25o/o discount for a qualifiiing underground
conversion project. The current understanding is that the Village of Key Biscayne meets all
the criteria for this discount. Refer to FPL's General Rules and Regulations for Electric
Service, Section 72, for the Installation of Underground Electric Distribution Facilities for
the Conversion of Overhead Facilities [www.fpl.com/rates/pdf/electric-tariff-section6.pdfJ.
This document requires an Underground Facilities Conversion Agreement and sets certain
deadlines for the process and payments.
Time is of the essence and the Village should facilitate further
discussions, working to expedite the decision making process in light of
the upcoming hardening proiec! anticipated 20L8. If the hardening
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proiect advances prior to the undergrounding conversion, the Village's
costs for the underground conversion will be significantly increased due
to the higher net book value of new, undepreciated facilities to be
removed.
There are a number of issues that could significantly impact the forecasting of costs. The
majority of those issues cannot be duly explored without beginning the detailed design.
Therefore, the opinion of probable costs is provided with the following assumptions:
a. The costs are founded on a high-level analysis and does not include any in-depth
system design considerations.
b. The aerial to underground conversion is limited to the primary service providers for
electric power and communications [for example, FPL, AT&T and Comcast).
c. The replacement of the current systems, any incremental costs associated with
improvements in system characteristics (for example replacing copper wire with
fiber optic cable) would be the responsibility of the utility owner and are not
included.
d. The underground facilities will be installed in a joint use utility trench within
unpaved areas of public rights-of-way, The joint utility trench is assumed to fall
within the roadway swales to avoid pavement restoration, expedite installation and
reduce traffic impacts.
e. The Village will be responsible for the construction of the trench and installation of
the conduit.
f. Private easements will be obtained when suitable right-of-way is not available [may
be necessary for the placement of the above ground facilities). The acquisition of
the required easements and all associated costs will be borne by the Village, not the
utility owners.
g. The legal fees and costs associated with the project and the acquisition of suitable
easements has been estimated, the final costs will depend on the willingness of the
property owners.
h. Trenching and conduit installation will be performed by the Village. Placing, pulling
and connecting of services will be performed by the respective utility owner
i. A conceptual design and corridor plan has not been developed, therefor the number
of potential conflicts with other existing facilities and landscape, constructability
and access factors, impacts to the public and business during construction and the
location of the new utility features cannot be addressed.
j. The conversion cost includes the removal of the existing aerial facilities, poles
transformers, etc.
k. Specific conversion costs associated with the property service entrance connections
will vary according to the specific conditions encountered at each location. For this
estimate an average connection cost is used
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L The costs associated with relighting of streets currently feed by aerial service is not
included
m. Costs include the "low-profile" Vista type switch cabinets.
The preliminary opinion of probable cost total is $29,69L,750, includingthe costs for
service entrance conversions. Utilizing different methodology and metrics, there is a
range between $20,000,000 and $40,000,000.
8.0 PROIECT SCHEDULE
This project is anticipated to be designed and contracted as one project. The project
design schedule will be largely based on the utility owners. The utility owners will propose
the preliminary location of the above ground facilities. Final locations will be determined
based on a review of available right-of-way and/or suitable easements. The Village will bid,
award and control the installation of the facility infrastructure conduit. The utility owners
will be responsible for the placement and pulling of the wire, as well as the ultimate service
entrance connections. The production of the joint utility trench is dependent on soil
conditions, the number of street and driveway crossings, and the associated dewatering
efforts. The underground work will continue through the length of the contract. For this
purpose we are assuming multiple construction and utility work crews. Phases will be
energized as dictated by FPL's design. Once the underground facilities are complete, the
service connections must be appropriately coordinated with the property owner, The time
frame for this process will be based on the availability of the individual property owners,
Once all services are connected, the utility owners will remobilize and remove their
existing aerial facilities. The foliowing time frames are estimated (refer to Appendix B for a
more detailed analysis) :
a. Funding consultant, study, discussion and approval: 4 months.
b. Survey, design and easement acquisiti on: 24 months [2 years).
c. Construction, joint trench, utility installations, service connections and restoration:
50 months [4 years and 2 months).
9.0 FUNDING SOURCES
A search was conducted of similar underground conversion projects and previously
prepared studies. The following funding sources were identified within the discovered
documents. This is not a legal opinion, some options may not be available to the Village of
Key Biscayne. In general, costs could be [a) paid by those consumers who are directly
affected by the conversion projec! those that live within the project boundaries, (b)
subsidized by a wider group of consumers, those that use the services or purchase goods
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within the Village, or (c) some combination of the two. This can be accomplished in several
ways:
a. An increase in general funds through an increase in taxes and user fees, such as
sales tax, meals tax, room ta& property taxes etc.
b. Creation of a Special Assessment District to assess property owners within the
subject area. The amount of the assessment can vary depending on amortization
rates, methodologies used, and the opportunity provided for property owners to
prepay, thereby reducing future payments.
c. General Obligation Bond funds to pay for projects for the public good. Bond
amounts will vary depending on the rates and number of years, Bonds are secured
by and paid from special assessments collected from the affected properties and
therefore must be in place prior to the issuance of any debt.
d. Self-funding from current and future accounts dedicated to the underground
conversion
In summary, the cost should be funded by the public receiving the benefits, either within
the local tax structure or by a surcharge on the customer's utility bills, Ratepayers receive
the benefit of reliability, taxpayers receive the benefit of aesthetics, and both parties share
the public safety benefit.
Due to the size of the project and the complexity of securing public purpose funding, the
Village should be prepared to spend considerable time and effort evaluating the funding
sources available. This will include hiring legal and financial consultants [such as bond
counsel) specialized in this area to study, to evaluate and present those options to the
Village.
1O.O ALTERNATIVES TO UNDERGROUNDING
There are several alternates to the complete underground conversion and are provided
here in no particular order:
a. Work with FPL on their upcoming hardening project. In addition to upgrading the
wind loading requirements [which should reduce outages due to adverse weather
and wind), initiate reliability-focused aerial design standards (for example, animal
guards, lightning arrestors and avian framing shields).
b. Require a more aggressive tree trimming and vegetation management program.
c. Limit the underground conversion to the main feeders. The feeders along
Fernwood Road and Crandon Boulevard border the public use and recreational
areas and are highly visible. This feeder may be targeted first, with other feeders
following.
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d. Identify and focus mitigation efforts toward the aerial facilities that repeatedly
experience the most significant problems. Base this on the number and duration of
outages, as well as the number of out-of-service customer hours.
e. Target the underground conversion to priority areas that directly affect public
health and safety, such as the sanitary sewer and storm water pump stations, traffic
signals, schools, shelters, and other municipal and governmental buildings.
f. Do nothing and continue the current practice.
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AppendixA:
Appendix B:
Appendix C:
Appendix D:
Appendix E:
Appendix F:
Appendix G:
Appendix H:
Appendix I:
Appendix f :
Appendix K:
LIST OF APPENDICES
Aerial Location Map
FPL Overhead Facilities Map
Existing Infrastructure Map
Project Schedule
Opinion of Probable Costs Worksheet
foint Use Trench Detail
Power Service Conversion
Power Details
Communication Details
Existing Street Lighting
Glossary
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APPENDIX A
Aerial Location Map
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APPENDIX B
FPL Overhead Facilities Map
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IIlr-.1t
-nirt6t
t::
$ irilrir€ro'.?
i*t{gl*:f 4"|l
!-r OHFeeder
-
OHPrimary
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
APPENDIX C
EXISTING INFRASTRUCTURE MAP
August 2016
Village ofKey Biscayne
Underground Utilities Feasibility Study
I
{"o1o
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
APPENDIX D
Project Schedule
August 2016
Village ofKey Biscayne
Underground Utilities Feasibility Study
VILLAGE OF KEY BISCAYNE UNDERGROUND UTILITIES FEASIBILIW STUDY
I NITIAL ESTIMATED PROJECT SCHEDULE
2016 2At7 10rE 2019 z0?0 202r 2022
faskl{ame Duration J 5 N I M M l 5 N J M M J JsN M M J 5 N l M M J s N I M M J s N I M M I 5 N
Funding Decision 4 months
Request for Proposal and Hotice to Proceed 2 months
Survey & Data Collection 6 months
Design & Permitting 12 months
Eesement Acquisition I months
Bidding and Contract Negotlataon 4 months
Construction {Conduit - Joint Trench}36 rnonths
Constructlon {Gbles - All Utility Owners}36 months
Service Connections, Removal & Restoration 12 months
Project Completion & Closeout 4 months
Total 74 months
WGI-simultaneo t
mptions
. Easement Acquisition, if required, will be conducted by the Village
2. Assume$ no construction moratoriums exist
the Vil3. Assume multiple crews
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
APPENDIX E
Opinion of Probable Costs Worksheet
August 2016
Village of Key Biscayne
Undersround Utilities Feasibility Study
VILLAGT OF KEY BISCAYNE
UTILITY UNDERGROUND CONVERSION OPINION OF PROBABTE COSTS
24,000 LF Feeder
52,000 LF Primary
1,143 Units
HARD COSTS
MAIN FEEDER QW UNIT cosT TOTAICOST
Fernwood Road 8,000 LF 255 5 2,12o,ooo
Harbor Drive 7,400 LF 26s s 1,961,000
Galen DrlSunrise Drl Enid Dr 6,400 LF 265 5 1,696,000
Key Colony 2,2OO LF 265 5 ssl,ooo
Sub Total Main Feeder 24.000 LF 5 6,360,000
UXUilES {FPL, ATT, Comcast, etc}QTY UNIT cosT TOTAI COST
Residential North tnsrth af Heather)16,200 LF 190 5 3,078,000
Residential Central (Heather to Mclntyre)L23OA LF 190 $ 2,337,000
Residential South (Mclntyre to Mashta)17,900 LF 190 5 3,4o1,ooo
Residential Mashta lsland 3,300 LF 190 5 527,000
Residential Holiday Colony 2,300 LF 190 5 437,000
5ub Total Utilities s2,000 5 9,88o,ooo
EQUIPMENT QW UNIT cosr TOTAT COST
FPL Transfarmers 200 EA 2,000 S 4oo,ooo
FPL Switch Cabinets 50 EA 75,000 $ 3,75o,ooo
Misc (Junction Boxes, manholes, etc.)7 LS 500,000 s s00,000
Servlce Entrance {Average)7,743 EA 2,250 5 2,s73,,75o
5ub Total Equipment $ 7,221,7so
SUBTOTAL HARD COSTS 5 23,451,7s0
OTHER
Contingency {10%}1 LS 2347,40O $ 2,347,000
TOTAL HARD 25,808,750
soFT cosTs
DESCRIPTION qTY UNIT cosT TOTAL COST
Engineering & Permitting {7%}1 LS 1,807,000 5 r,eoz,ooo
Program ManaBement 1 LS I,776,000 5 1,776,000
Legal Fees {Easement Acq., Contracts, etc}1 L5 300,000 $ 300,000
TOTAL SOFT COSTS 3,gg3,ooo
TOTAT ESTIMATED PROJECT COSTS 29,591,75Q
I
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
I
APPENDIX F
foint Use Trench Details
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Studv
.s+
i(o\
.s
q
o$
\t-\
\
2"
gI
GRADE
(aono, DRtwwAy oR swALE)
Ar&T / COMCAST
LATERAL CONNECTION
FPL LATERAL
CONNECNON
PROPOSED AT&TI/COMCAST 7
coNDUtrs
PROPOSED FPL CONDUITS
TYPICAL SECTION. SHARED TRENCH
N.T.S.
RECOMMENDED TRENCH SECTION
.s
t
$\
Io(iIo$
h4 vARtES
.(
(oF)
.L
PROPOSED
AT&T/C0MCAST
coNDutrS
PROPOSED FPL CONDUI
CRADE
(ROAD, DRIWWAY oR ,WALE)
VARIES
FPL LATERAL
CONNECTION
TYPICAL SECTION' SEPARATE TR ENCH
N.T.S
August 2016
ALTERNATIVE TRENCH SECTION
Village ofKey Biscayne
Underground Utilities Feasibility Study
APPENDIX G
Power Service Conversion
August 2016
Village of Key Biscayne
Underground Utilities Feasibilitv Study
Customer supplied and
installed meter socket
/
6'Max
5'Min.
Customer 2 or 4"
Rigid Galvanized,
lntermediate, or
Schedule 80 PVC
(Notes 2 & 8)
Shap coMuitto wall
24" Min.36" Max.
(24'Prefened)
>l
Grade
\
August 2016
PROPOSED UNDERGROUND SERVICE
Village of Key Biscayne
Undersround Utilities Feasibility Study
sen'lI€
Er$el
rl
TIF'leilRd $eric€ tFop lffi{t
oirF rlEutral lsEE aarl 780
tEn€.
Hn.fi'dPrilc*
tBtfyobsllsufiia.vrIEr-t
EXISTING OVERHEAD SERVICE
ITO BE REMOVEpJ
6'illr,
I[. Hn.
sEe flote E
g llllrl
5'l,br
August 2016
Village of Key Biscayne
Undersround Utilities Feasibiliw Studv
APPENDIX H
Power Details
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
i$TUR,rl CRAOE
EYF BCLT TgR
FQR SPLICIIIGgEf DCg ilE-
F
J_
nllInttAl|'
OSOUTIDIN6
SOPPERV/ELD CROUNO
17.0.0 FOR Sft0UNDtNC
SIDE VIE|/I
6" r0 FVC
E'.JD BELLS
FULL-IN-IRONS4 PFR BOX
r'oR \fll[N EYE EuLI l-j,
!]OT IN USE. F'LACElHt BRASS PL|JC tr.l
P05lTt0Fr.
UCIS
$TEP
SEE C-
TYPIgAL WALL SSCTION
END VIUYI
FO0
sPLtcE$.
lo'
T I
_L
-T-
I
I
II
B'
TOp vtElv
FEEDER SPLICE BOX
r
I
I
L
I
I
I
l
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
rEf* wU{€W
PLU+.*
UfiT€.: F#+, iPL]{E
*€IFI?s SEE HS*{-ig;44
Hft{NT'&-E EL*ATI*H
,44t'tna6Lr. u5** hE A 1le Pftil{AftY t?uaT ffiY,
PRIMARY SPLICE BOX
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Studv
FL CNO ROO
&TERNAE
LOCATQN
stt NoE c
Effi - tueflrffi
ril silioic€AR,
PilJC HqfS
wqtI
MtN. ^rrqR
s$raLLAnQr,
LES E8
1/2'
sffiF
txsreL oucl sEAt
PER Ufl-z',o.O
OOO ATP FEEOTN SIIE
s€cTtoN l-^
2' PVC
FUSE Sr0E (PraE-9 sHowx)
sECnoN 8-8
GROUNDI116
RINGS - flfrNlSNEDr[ s*rTcHcs^f,.
|NSIALI oUCt s€AL m rIL oucls pER utr_29.0.0.
PAD MOUNTED SWITCH CABINET
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
r€)$ p{
ro" ._J
IIN€ SIDE
LOID St0t
f- 62-1/2,
9,0r ufl
stot
NO]E :
r-2'F6 R
c!5TOMS wfx
24'UDtryUU
R&rus 0f 8tilos
AT PADS
\i
qfiCRElf PAD gr Ct/Stou[nftr uRcE 3r lFasFoFuaR
TO 5 fEfl rE€ ux-il6.1.1
CONffifTt PAD 8Y CUSIOMFE
FoR PPt-t rusf crBtHLisE ux-12{.o.o
PRIMARY FUSE CABINET
6)
(!)
t
,d
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
SEE coN0t/tl LocATtoH tN
LOW STA"E TX. PAD OPTNING
BELC'\V
CIASS il FUSE
REUIF
6, r-65.?-t
gMAtL STREFI
UCHI CABLT
GROIJIID STRAP(00 HoT RErtorE)
TREilCH
FRONT VIEW
IC LOW STYLE TX PAD OPENINC
SINGLE PHASE TRANSFORMER
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
tr
t-
I
tre00
5?,00
lffin fl[I^$ LWffi0ml iTn )
rs,rs ->l r75
67.00
FR|}II VITV
ss UFT-trF rYPt H[Sd
6?,00
rull& vltv
66.08
nl6H! SilE vrtv
5l oo eg.oo
1,75
mn stir {snt [Alo]/ tsur FEtatE)
CAPACITOR BANK
*{
EIEIHHbbEIJ
ts6Eg gH
EI
\
August 2016
' ;:',
''. -I."",- r4.;";,.
Village of Key Biscayne
Underground Utilities Feasibility Study
APPENDIX I
Communication Details
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
AT&T FIBER OPTIC DISTRIBUTION CABINET
August 2016
AT&T CABINET IN CONSTRAINED RIGHT OF WAY
Village of Key Biscayne
Underground Utilities Feasibility Study
AT&T ABOVE-GROUND FIBER SERVING TERMINAL
MultiPort
installed
with
swingarm
in down
position
17 x 30 in.
handhole with
swingarm placed
MultiPort
installed
with
swingarm in
up position
August 2016
AT&T BELOW-GROUND SERVING TERMINALS
Village ofKey Biscayne
Underground Utilities Feasibility Study
APPENDIX I
Existing Street Lighting
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
FPL OPEN BOTTOM
STREET LIGHT
CUSTOMER OWNED
DECORATIVE STREET
LIGHT
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Study
APPENDIX K
Glossary
August 2016
Village of Key Biscayne
Underground Utilities Feasibility Studv
GLOSSARY
Power
Feeder Cables - Carry high voltage from the substation to primary lateral cables.
Primary Lateral cables - carry medium voltage to distribution transformers.
Secondary Cables - Carry low voltage service form the transformer to the service cable.
Service Cables - Carry low voltage service form either a secondary cable or directly form a transformer to
the meter.
Transformer - A device used to lower the voltage to the utilization voltage of household appliances and
typically feed several customers through secondary distribution lines at this voltage.
Switch Cabinet - Electrical device for making, breaking or changing the connections in a circuit.
capacitor Bank - used to increase stored power and improve current capacity.
Fuse Cabinet - Used to fuse multiple underground primary cables.
Feeder Splice Box - A 5'x10'non-traffic bearing concrete box used to splice underground feeder cables
together, This box is generally buried at a depth of 36" to 42" withthe top of the box flush at final grade.
Primary Splice Box - A 2'x4'non-traffic bearing polymer box used to splice underground primary cables
together. This box is generally buried at a depth of 36" to 42" with the top of the box flush at final grade.
Pull Box - A 72"x 13" non-traffic bearing polymer box used to connect secondary cable to service cable for
both residential and commercial customers. This box is generally buried at a depth of 24" with the top of
the box flush at final grade.
Communication
Fiber Optic Distribution Cabinets - Surface mounted cabinets replace the existing aerial facilities. These
cabinets may be placed within the right of way or in a utility easement if available, depending on available
clearances. Cabinets mayvary in size from 36"x21"x14" to 49"x48"x20".
Fiber Serving Terminals - May be placed above-ground or below-ground. Generally this equipment
serves 6-8 residences. This component can be placed in the right of way or in a utility easement if available,
depending on available clearances, The below ground vault is non-traffic bearing.
August 2016