Key Biscayne Master Plan 043944000.18w_Key_Biscayne_MP(forJooMag) | Page 58

VILLAGE OF KEY BISCAYNE UNDERGROUNDING OF UTILITIES — MASTER PLAN
6.1.3
Cost Efficiency
As with any project of this magnitude, there is a high priority placed on cost
control. Effective cost control begins during the planning process. From an
electrical perspective, phase lines were set to allow the reuse of as much
existing underground infrastructure as possible. For example:

Crandon Boulevard is a natural boundary because the east side
and the west side are linked with underground facilities, therefore
they can be reused and electric and communications cables can
remain in service without the need for replacement in this program.
 An underground link to Mashta Island and the mainland also exists,
but FPL stated additional conduit will be required to implement an
underground system.
 The existing poles on either side of the bridge can also provide
temporary transition points, as they do today.

Underground feeder lines in phases 2 and 3 can also be reused
to serve proposed facilities for those areas without the need to
replace them.
To reduce the costs, we also took advantage of locating phase limits where
the existing infrastructure lends itself to providing the fewest transition
points throughout the Village. For example, phase lines are defined where
north-south feeders are the only overhead lines that will require transition
poles. By placing a phase limit at these locations, existing radial lines can
remain intact in their entirety, minimizing the number of temporary transition
poles and equipment that are required, thus reducing cost. Since these
transition points are temporary, but necessary for the continued provision
of power to the community, it is important the number of transitions be
reduced to the minimum required. The phasing map prepared for this
program includes locations of potential temporary transition poles.
6.2
Sequencing Recommendations
While the limits of each individual phase were defined, the sequence in
which they are to be constructed was also considered. This master plan’s
sequencing recommendations for the undergrounding program, along with
sequencing of additional planned projects (i.e., capital projects, watermain
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replacement, etc.), are graphically depicted on the sequencing maps
beginning on page 57 of this master plan.
To develop the recommended sequence for the program, several factors
needed to be considered. These factors included the following:
 Major work programs
 Traffic impacts
 Cost efficiency
 Schedule efficiency
The above factors and their influence on the development of the
recommended sequencing of the program are described in greater
detail below.
6.2.1
Major Work Programs
As discussed in the Data Collection section of this master plan, there are
several major work programs either planned or will be underway during
the undergrounding program. There is a need to coordinate these major
work programs with the undergrounding program to minimize community
impacts to the extent practical. Major work programs in addition to
undergrounding consist of the following:
 Village of Key Biscayne Capital Improvement Program
 Village of Key Biscayne Beach Renourishment Program
 Miami Dade Water and Sewer Department Watermain Replacement
Village of Key Biscayne Capital Improvement Program
There are several projects contained in the Village of Key Biscayne’s Capital
Improvement Program or long-term master plans that must be considered.
Many of these have not yet been funded, but the Village is interested in
bundling them to be constructed within the undergrounding program.
There is also a desire to construct capital projects that are funded from
alternate sources with the undergrounding program to take advantage
of the restoration cost sharing. This is an important consideration when
determining which capital projects should be constructed concurrently with
the individual undergrounding phases.