Key Biscayne Master Plan 043944000.18w_Key_Biscayne_MP(forJooMag) | Page 122

VILLAGE OF KEY BISCAYNE UNDERGROUNDING OF UTILITIES — MASTER PLAN
schedule. It has been our experience that costs are lower, the
schedule is minimized, and the work is generally more efficiently
coordinated when the municipality performs the work versus when
work is performed independently by the various utility owners.
Even in the case where the utility owners perform the work,
there are still items needing to be performed by the municipality,
such as easement acquisition, restoration, and rearrangement
of customer service entrances from overhead to underground.
Items and operations required to be performed by the utility owner
include, but are not limited to, underground system make-ready
and energization, telephone cable and equipment installation,
cable television cable and equipment installation, and overhead
infrastructure removal. Costs related to these utility owner activities
have been included in this OPC.
for a specific combination of construction labor, steel, concrete, cement,
and lumber using data from 20 cities in the United States. The CCI is
similar in concept to the well-known CPI (Consumer Price Index), which
tracks the consumer prices for a representative base of goods and services
for urban consumers, but is considered more reflective of the construction
industry and construction labor rates.
The average yearly historical CCI’s between January 1990–August
2016 were reviewed. The average percentage increase of construction
costs during this time (January 1990 and August 2016), as well as the
time between the years 2006 and 2016, was 3.0% per annum. The
average annual percentage increase in average construction costs for
any given year since 1990 ranged between 2.5% and 3.9%. Based on
this information, an annual inflation factor of 3% was used for estimating
inflation cost impacts in this OPC. It should be noted that inflation is difficult
to accurately project into the future and historical trends are not necessarily
indicative of future inflation rates. Month-to-month or year-to-year changes
in inflation rates could be significantly more or less than the percentages
assumed for this OPC.
12.7 Assumptions and Limitations
 The OPC developed for this master plan is based on a high-level
cost analysis for large-scale planning and budgetary purposes
based only on the information available at the time this master plan
was developed. The OPC contained in this master plan should not
be considered applicable to a single block or other specific smaller
scale areas since variations may exist on a smaller scale.
 Roadways disturbed by the undergrounding will require trench
repair. Milling and resurfacing of the disturbed pavement has been
included as a separate line item in the OPC. Roadway repairs
are anticipated to be milled and resurfaced for one lane width
and a minimum of 100 feet in either direction in accordance with
County standards. Crandon Boulevard is a County-maintained
road and therefore milling and resurfacing would be required along
this corridor.
 Detailed network designs for proposed electrical, cable, or
telephone infrastructure have not been performed and therefore
were not available at the time of this master plan. This OPC is
based on assumptions and generalizations regarding elements that
a typical underground utility conversion project within the Village of
Key Biscayne is likely to include.
 This OPC assumes a phased construction approach as outlined
in this Master Plan. Each phase of construction is expected to
have approximately a 18 to 24-month construction duration.
Assumptions made in the preparation of this OPC include the following:
12.7.1
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General Assumptions and Limitations
This OPC considers the undergrounding of electrical, cable, and
telephone facilities only. Cellular facilities, broadband infrastructure
improvements or new broadband network installations, planned
infrastructure improvements, and/or other facilities are not
considered in this OPC. The unit costs provided assume all cable,
electrical, and telephone conduit will be installed in a joint trench
(with required separation) by the same contractor who is directly
contracted by the Village.
This OPC assumes the Village will engage a contractor to install
all equipment and materials except those items and operations
required to be performed by the utility owner. We recommend
the Village perform as much of the construction as possible. This
provides the Village with more control over project costs and