Key Biscayne Master Plan 043944000.18w_Key_Biscayne_MP(forJooMag) | Page 60

VILLAGE OF KEY BISCAYNE UNDERGROUNDING OF UTILITIES — MASTER PLAN
Because of how the Village was originally developed and the configuration
of the land mass and roadways, it would be easy to have two adjacent
work areas undergoing heavy construction at the same time, impacting
a large area of the Village at once. A good deal of consideration and
strategy went into developing a sequence that avoided just that. To that
end, Kimley-Horn recommends that heavy construction activities do
not take place simultaneously in two adjacent phases. For example, as
Phase 1 heavy construction ends, Phase 2 heavy construction can begin,
and so on and so forth. Heavy construction refers to the installation of the
conduit and equipment pads either by open trenching or directional drilling
operations. While heavy construction activities are taking place in Phase 2,
less impactful activities can take place in Phase 1 such as equipment
installation and demolition of existing facilities. In this manner, a motorist
can avoid roadways experiencing heavy underground construction and will
never have to drive through two phases undergoing heavy construction
activities at the same time.
6.2.3
Cost Efficiency
In determining the sequence of the phases, cost efficiency was also a
priority. At the completion of each phase, there will be a transition from
the new underground system to the existing overhead system to maintain
connectivity of the systems after the de-energized poles are removed.
These transitions almost always require the installation of new temporary
poles with electric and communication risers. Because these new poles
are temporary and will be removed when their location phase is completed,
it is important to minimize the number of transitions to the greatest
extent possible.
by overlapping phases wherever possible while avoiding significant traffic
impacts to the extent practical.
6.2.4
Schedule Considerations
As discussed in the Physical Size of the Individual Phase section, individual
phases were developed considering work that could reasonably be
performed in an 18 to 24-month continuous period. To gain schedule
efficiency, Kimley-Horn recommends work in adjacent phases overlap each
other to avoid waiting until final completion of one phase before beginning
work in a subsequent adjacent phase. This recommendation is discussed
in further detail in the Overall Program Opinion of Schedule section of this
master plan. In general, this would allow for service conversion work and
overhead infrastructure demolition to occur in one phase, while heavy
underground work would occur simultaneously in the adjacent phase.
In no case do we recommend heavy underground work be performed
simultaneously in adjacent phases. This avoids significant traffic impacts
expected if these activities were allowed to occur simultaneously in
adjacent phases.
Phases in the commercial areas of the Village are anticipated to be more
technically challenging from a design and easement acquisition standpoint.
This is due to the high electrical load demand, limited right-of-way
availability, and urban landscape. Fortunately, the way the commercial
property is situated in the Village, we were able to divide the commercially
zoned areas into three different phases, effectively reducing the complexity
in any one phase. This will allow adequate time for design and easement
acquisition for these challenging parcels.
In order to do this, phases should be constructed sequentially so only one
side of the phase area would require these transitions. The sequencing
this master plan recommends accomplishes this by constructing phases
generally starting from the south end of the Village moving towards
the north. This will also minimize the amount of temporary facilities the
communication utilities need and generally accommodates their preferred
sequence of conversion. In addition, compressing the schedule as
discussed in the following section will reduce costs due to inflation and
project general conditions. The sooner the program is complete the less
inflation factors into the overall budget. We recommend accomplishing this
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