statement of qualifications pipeline, oil and gas services - Hatch Mott ...

Santa Rosa Sound Waterline Crossing
Location
Escambia County, FL
Client
ECUA
Project Type
Water
Services
Design
Plans and Specs
Permitting
Construction
Administration
Duration
2003
HDD Contractor
Intercon Construction, Inc.
5512 State Road 19 & 113
Waunakee, WI 53597
Office: 608-850-4820
Construction Cost
$2.63 million
Project Description
Prior to this project, the Emerald Coast Utilities Authority
(ECUA) provided potable water to Pensacola Beach via a
16-inch ductile iron river pipe transmission main that was
installed on the old Bob Sikes Bridge, crossing Santa
Rosa Sound until it reached the 125 foot wide
IntraCoastal Waterway Channel. At that point the water
main was divided into two 12-inch water mains that were
strapped to bridge pilings and laid under the Channel. In
the fall of 2001, divers found a subsurface leak in one of
the 12-inch water lines. The ECUA repaired the leak and
ordered a complete inspection of the 12-inch water lines,
which determined that additional repairs were required.
Hatch Mott MacDonald (HMM), was retained by the
ECUA to design the repairs and solicit quotes from local
diving companies to perform the work.
After the repairs were completed, the ECUA decided to
replace the existing 16-inch water main which, due to its
aerial installation on the bridge, was exposed to a continuously humid saltwater environment along
with potential damage by marine vessels either hitting the bridge or snagging the shallowly buried
pipeline crossing under the IntraCoastal Waterway. The staff discussed alternate construction
methods for installing the replacement water transmission main under Santa Rosa Sound, a distance
of approximately 5,300 feet. The horizontal directional drill (HDD) method of construction for the
replacement water transmission main was selected. HMM had previously provided engineering and
construction administration services to the ECUA for water main and sewage force main
installations by the HDD method of construction. HMM prepared a detailed surface and subsurface
survey of the proposed water main route. ECUA staff provided design input to the HMM team for
the components of the desired water transmission main. HMM staff completed the design and
obtained the regulatory approvals for the project in the spring of 2002, and the request for bids went
out. When bids were received for the project, the low bidder was InterCon Construction Inc, of
Madison, Wisconsin. Construction of the project was completed in 2003.
HMM Role
Hatch Mott MacDonald (HMM) was responsible for all
aspects of the transmission main design, preparation of
plans and specifications for public bid, cost estimates,
permit applications and construction administration
services.
Project Highlights
• The project consisted of the installation of a 5,300 LF
24-inch HDPE water main in a 30-inch steel casing under the Santa Rosa Sound and the
Intracoastal Waterway using the HDD method of construction.
• The water main was installed in up to 30 feet of water at a depth of 30-35 feet below the bottom.
• The 24-inch water transmission main and accessory facilities were installed at a cost of $2.63
million.
• A coordinated and cooperative team effort by staff of
the ECUA, HMM, InterCon, and local regulatory
agencies proved that a long distance HDD project,
even with confined working conditions, could be
successfully completed for the benefit of the public on
Pensacola Beach.