SLIDE 1
Outline
- Project Objectives
- Background
- Financing
- Existing Stormwater System
- Proposed Improvements
- Next Steps and Schedule
Stonehedge
Page 1
Stonehedge Stormwater Improvements South Burlington, VT June 18, - - PowerPoint PPT Presentation
Stonehedge Stormwater Improvements South Burlington, VT June 18, - - PowerPoint PPT Presentation
Stonehedge Stormwater Improvements South Burlington, VT June 18, 2013 Stonehedge Outline Project Objectives Background Financing Existing Stormwater System Proposed Improvements Next Steps and Schedule Page 1 Stonehedge
SLIDE 2
SLIDE 3
Project Objectives
- Add stormwater treatment and control prior to
discharging to Potash Brook Will address State stormwater permit issues to facilitate transfer of system to the City
- Improve the overall stormwater collection and
conveyance system as part of effort to provide treatment and control Will address some of the existing drainage/flooding problems
Stonehedge
Page 2
SLIDE 4
Background
- Stormwater system installed in phases beginning in 1970s
- No stormwater treatment or control
- Flooding and nuisance drainage problems now common
- Condo Associations (and not City Stormwater Utility)
currently responsible for stormwater system
- State stormwater permit issues
Original stormwater permit expired in 1985 Renewal not possible because discharge to “Stormwater Impaired” streams (Potash to the north, Bartlett to the South) Renewal process: State’s Engineering Feasibility Analysis to develop a “best-fit” solution
- Previous conceptual study
- Grant from the Corps of Engineers
for current project
Stonehedge
Page 3
SLIDE 5
Financing (1/3)
Stonehedge
Page 4
- Engineering Costs: ~$120,000
- Construction: ~$530,000 (working estimate)
- City has a project agreement with Army
Corps of Engineers (ACOE). ACOE will be responsible for 65% of project costs ($422,500).
- South Burlington Stormwater Utility and
Stonehedge residents responsible for remaining 35% of project costs ($227,500).
SLIDE 6
Financing (2/3)
Stonehedge
Page 5
- The City of South Burlington owns 25% of the
impervious area that is covered by the State permit and will pay 25% of the remaining project costs ($56,875).
- The Stonehedge homeowner associations own
75% of the impervious area that is covered by the State permits and will pay 75% of the remaining project costs ($170,625).
- Public vote in March 2011 authorized a
Stormwater Special Assessment District.
SLIDE 7
Financing (3/3)
Stonehedge
Page 6
$2,413 $845 Estimated Cost/Unit (202 units) $650,000 $650,000 Total Project Cost $162,500 $56,875 City Share of Project Cost $487,500 $170,625 Stonehedge Share of Project Cost $- $422,500 ACOE Share of Project Cost Without ACOE Funding With ACOE Funding
Construction costs are working estimates that will be refined as the design is advanced.
SLIDE 8
Existing Stormwater System: Overall
Stonehedge
Page 7
- Catch basins/pipes
- Open swales
- Off-site runoff
- No treatment or
control
SLIDE 9
Existing Stormwater System: Photos
Swale and Culvert
Stonehedge
Page 8
Roadside Ditch Cedar Glen Road Catch Basin Potash Brook Existing Swale
SLIDE 10
Proposed Improvements: Overview
- Refinement of L&D Conceptual Plan
- Primary Components:
Improved capture of stormwater on Cedar Glen Drive Improved interception of off-site water Expanded closed-pipe system Three new bioretention areas New stormwater pond
Stonehedge
Page 9
SLIDE 11
Stonehedge
Page 10
Proposed Improvements: Previous Concept
SLIDE 12
Proposed Improvements: Current Site Plan
Stonehedge
Page 11
SLIDE 13
Stonehedge
Page 12
Proposed Improvements: Bioretention
SLIDE 14
Stonehedge
Proposed Improvements: Pond Site Plan
Page 13
SLIDE 15
Stonehedge
Page 14
Proposed Improvements: Pond Profile
SLIDE 16
Next Steps and Schedule
- Complete design (late 2013)
- Complete permitting (early 2014)
- Select Contractor (Spring 2014)
- Construction (Summer 2014)
- Schedule dependent on Army Corps of Engineers
Stonehedge
Page 15