Harbour Island Force Main Replacement Design Build Project South - - PowerPoint PPT Presentation

Harbour Island Force Main Replacement

South Neighborhood Association October 22, 2018

Design – Build Project

Agenda

• Project Update
• Surge Facility Construction Update
• Status of Route Study
• First Segment of Harbour Island Force Main Replacement
• Alternatives for Maintaining Wastewater Services to Harbour Island
• Timeline and Coordination
• Next Steps
• Questions

• Road has been reopened
• Unable to complete construction due to concerns with condition of pipe
• Test results showed potential issues at high point on Franklin Street
• Test results appeared to be satisfactory at location adjacent to Convention Center
• Permit constraints for roadway closure didn’t allow for additional assessment
• Evaluating options to perform additional assessments in the near future

Surge Facility Construction Update

Status of Route Alternative

• Development of Route 7

Status of Route Alternative

• Development of Route 7

Status of Route Alternative

• Parks Department
• Utility Easement through Cotanchobee Fort Brooke Park
• Requires approval of the Trust that controls the land use
• Exhibits for initial review have been prepared
• Port Authority
• Providing assistance with routes and easements within Port property to the Plant
• Private Property Owners
• Easements are required along Guy Verger/Maritime Blvd.
• Initial contact with owners has been made
• Sub-Consultants
• Microtunnel Evaluation

• City has initiated budget approval for design and construction of First Segment of the

Harbour Island Force Main along Water Street

• Budget approval at mid-November City Council Meeting
• Designing exact alignment of Route on Water Street
• 900 ft. segment from Franklin Street to Morgan Street
• Coordinating construction activities with Strategic Property Partners
• Construction of pipeline will not require closure of Franklin Street
• Timeline
• Construction Start: Mid-December 2018

First Segment of Harbour Island Force Main

Harbour Island Wastewater Collection System

• 12” Force Main from Harbour Island Pump Station must be connected to new pipeline
• Evaluating alternative routes
• Franklin Street option was eliminated due to parking garage extending under

roadway

• Evaluating Routes A, B, C and D

Alternatives for Maintaining Wastewater Services to Harbour Island

Routes A, B, C & D

Route A

PROS

• Pipeline mostly located

in City Right-of-Way

• Construction

Independent of New 54” Force Main CONS

• Longest Route
• Longest Construction

Duration

• Public Inconvenience

Route B

PROS

• Pipeline mostly located

in City Right-of-Way

• Shortest Distance

CONS

• Boat Slip Easements

Needed

• Florida Community

Trust Approval Needed

• Difficult Construction
• Public Inconvenience

Route C

PROS

• Construction

Independent of New 54” Force Main

• Shortest length of Pipe
• n Harbour Island
• Minimal Public

Inconvenience CONS

• Easement Acquisition

Route D

PROS

• Construction

Independent of New 54” Force Main

• Shortest length of pipe
• n Harbour Island
• Minimal Public

Inconvenience CONS

• Easement Acquisition

Routes A – D: Cost Comparison

Alternative Total Length (LF) Total Comparative Cost ($)

A 2,995 $825,075 B 1,660 $493,725 C 1,560 $405,825 D 1,600 $409,425

Easement Requirements For Alternative D - SNA

Proposal

• North half 20’ wide

permanent easement

• Temporary

easement over the east half of the TECO easement

• Pipeline will be

more than 20’ below the deepest floor beneath the boat slip

Easement Requirements for Alternative D - HICSA

Proposal

• Final Easement

requirements still to be determined based

• n further

investigations

• Two options
• Easement in the

roadway

• Easement aligned

in the grass

What to Expect – 12” Force Main Construction

• Pipe would be staged
• n Davis Islands
• 24/7 construction

work would be limited to one day

• Restoration and

beautification of the area would be completed to the standards of the SNA

Schedule For Alternative D

Weeks 1 2 3 4 5 6 7 8

Mobilize Onsite Construct New Force Main from Pump Station

Perform Directional Drill Across Channel

Install Pipe Across Channel Make Final Connections Shift Flows to New Line Restoration of Site (Landscaping and Irrigation)

Plans for Old 54” Force Main

• Plan to abandon existing pipe has not been finalized
• Not practical to remove existing pipeline or fill with grout
• Pipe will be flushed with clean water to remove sewage and prevent corrosion
• Valves will be installed at the ends of pipeline to seal the pipe
• City has no intentions of using pipe in the future, but it could be used in an extreme

emergency

• City will remain responsible for the pipe and will monitor its condition

Project Timeline

• Final Route recommendations to the City by mid-November 2018
• First Segment of Harbour Island Force Main Replacement Installation to begin by

mid-December 2018

• A timeline for design, permitting and construction will be presented once a final

route is selected

Next Steps

 Community Task Force Meeting – Mid-November

• Present Final Route Selection

 Public Meeting #3 – Mid/Late November

• Present Final Route Selection

Q & A

Project Website: www.hiforcemain.com Project Hotline: (813) 235-4830