Key Biscayne Master Plan 043944000.18w_Key_Biscayne_MP(forJooMag) | Page 120

VILLAGE OF KEY BISCAYNE UNDERGROUNDING OF UTILITIES — MASTER PLAN
2. Residential Connectors/Roadway Installation (i.e., Phases 1,
2, and 3) – Unit costs for this sample project area were similar to
the sample project above, with the exception that costs associated
with FPL feeder and Comcast fiber to the node conduit were
included. The density of these east-west connectors is also
significantly less than the residential described in sample project 1.
3. Residential on the Water/Non-Roadway Installation (i.e. Harbor
Drive and Mashta Island) – Unit costs for this sample project
area were similar to the sample project above, with the exception
that costs associated with asphalt trench repair for installation
of underground infrastructure within the roadway were removed.
Costs were added to consider additional sodding requirements and
potential driveway restoration associated with a conduit installation
off the roadway. Additionally, the electrical load in this sample
project is higher due to the larger homes and waterfront amenities
including potential boat dockage. This increases the electrical
density, quantities of electrical backbone, and equipment.
4. Multi-Family Area Roadway Installation (i.e. Phases 2
and 3) – Unit costs for this sample project were developed
considering overhead utility undergrounding in a dense multi-
family area. This sample project includes higher costs related to
general conditions and maintenance of traffic, higher quantities of
electrical and communication backbone, increased electrical and
communications equipment density, and increased restoration
costs.
5. Fernwood Mixed-Use/Roadway Installation (i.e., Fernwood
Road – Phases 1, 2, and 3) – Unit costs for this sample project
were developed for a representative section of a portion of the
Village served by the Fernwood Road corridor. This corridor is the
route for main electrical and communications conduit. It also serves
a mix of commercial and public buildings, as well as residential.
Equipment, feeder, and communication backbone will be denser
than typical residential sample projects due to the addition of
commercial parcels.
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12.3 Project Area Line Item Unit Costs
Based on the unit prices and quantities developed for each sample project
area, total costs for each sample project area could be developed. The
total costs for each sample project area were then divided by the length of
undergrounding within the sample project area to develop a representative
unit cost per linear foot conversion that could be applied on a Village-wide
basis to each of the program’s phase areas. The unit prices per foot of
conversion were categorized into the appropriate line item category for use
in the overall OPC. A summary of each line item category outlined in the
opinion of probable cost is in the table to the right.
12.4 Quantity Estimation
GIS shape files were developed during this Master Plan for roadways,
parcels, existing overhead utility locations, and outside infrastructure
project information (water main, CIP projects, etc.) and were used to
evaluate the quantities of program elements, including the length of
overhead to underground conversion. Based on this GIS data, the
following quantities were developed for each phase:
 Length of existing overhead utilities to be converted underground
 Length of roadway anticipated to be impacted by conduit
installation
 Estimated conduit joint trench length
 Number of parcels per phase
12.5 Credits
The following credits have been considered in the OPC. Other potential
cost savings opportunities are discussed in the latter part of this chapter.

Florida Power and Light Government Adjustment Factor (GAF)
Waiver Credit: It is expected the Village will enter an Underground
Facilities Conversion Agreement with FPL for the conversion of
Village-wide overhead facilities. In accordance with the FPL Tariff,
this program qualifies for a GAF waiver of 25%. The GAF waiver
credit amount has been estimated at 25% of the total estimated
FPL contribution-in-aid-of-construction (CIAC) cost to install