Key Biscayne Master Plan 043944000.18w_Key_Biscayne_MP(forJooMag) | Page 87

8.0 RISK ASSESSMENT
the contracting community to generate interest in bidding the packages
as they are advertised. If the Village were to pursue a Construction
Manager at Risk (CMAR) procurement method, it is recommended
the Construction Manager(s) be procured on a competitive basis.
Encouraging competition among interested parties provides a measure
of mitigation against rising construction costs in a growing market.
It is recommended that geotechnical explorations, record drawing
research, and subsurface utility locating be performed during the
design phase. This will reduce the risk of unforeseen subsurface
conditions being encountered during the construction phase, for
example: unknown/unmarked utilities, unsuitable soils, contaminated
soils, and/or rock conditions. Unforeseen subsurface conditions cannot
be completely eliminated, but this initial investment will eliminate
the majority of conflicts that otherwise would have arisen had this
exploration and research not been performed. Since encountering
unforeseen subsurface conditions is inevitable on any urban
underground infrastructure project, it is imperative the design team,
construction team, and Village stay focused on a solution for any given
conflict until the problem is resolved. When the project team is able to
quickly determine a solution in a non-adversarial manner, costs due to
the conflict are generally minimized.
Specialized drilling equipment can be employed to limit surface
disruption, which can minimize the risk of increasing restoration costs
due to specific landscaping requirements or specialized pavement
and driveway restoration costs. While horizontal directional drilling is
generally a costlier installation method than open cut trenching, the
savings in specialized restoration costs can sometime make it a more
cost-effective approach to complete the project. Entry and exit pits for
each segment of installation are still required, meaning excavation is not
completely eliminated, but it is significantly reduced and can be planned
in a way that avoids the areas with the costliest restoration requirements.
Pits will also need to be excavated in locations where conduits make
sweeps or connect to above grade equipment. Horizontal directional
drilling is most useful when installing conduits in a long straight line.
Horizontal directional drilling presents a risk of hydrofracture (“Frac-Out”)
occurring. Hydrofracture causes areas above the drilling location to
depress along the drilling line along with the release of drilling fluids to
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