i-794/hoan bridge project: stormwater treatment
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Presentation Agenda
Project Overview
Storm Water Overview
WisDOT Storm WaterProcess
Project Storm Water
Project Features
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PROJECT OVERVIEW
Carolynn Gellings, PEProject Manager
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DOT – Southeast Region
Carolynn Gellings, P.E. - DOT
I-794 Hoan Bridge & Lakefront Gateway Project Manager
DTSD SE Region - Environmental Services
1001 W. St. Paul Ave.Milwaukee, WI 53233
Phone: (262) 548 - 8716
Cell: (414) 750 - 3233
Email: [email protected]
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Project Location
Connects SouthernCommunities withDowntown Milwaukee
Vehicles per day (vpd):
Lake Interchange Hoan Bridge
Over 75,000 vpd Over 40, 000 vpd
HoanBridgeProject
Area
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Project Scope
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Project Scope: Hoan Bridge
MMSD Jones Island Wastewater Treatment Plant
Summerfest Grounds
Lakeshore State Park Port of Milwaukee
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Schedule Overview
Hoan Bridge painting continues through2016 and 2017
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PROJECT STORM WATER
OVERVIEW
Carolynn Gellings, PEProject Manager
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Storm Water Overview:
Identifying Areas for Opportunity
• Limited Real Estate• Construction Costs and Budget
Constraints• Future Maintenance – Responsibility and
Costs• Regulations and Requirements
• Community Input• Utilities• Hazardous Materials
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Storm Water Overview:
Design Partnering
• Extensive coordination with the City ofMilwaukee and DNR to identify waterquality improvements for the area
Concept drawings from
design phase.
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Storm Water Overview:
Storm Sewer System
I-794 East/West:Complete Storm SewerReplacement
Lake Interchange:Replacement of AboveGround SystemHoan Bridge:Downspouts, select catchbasins, select outfall
replacement/pipe lining
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Storm Water Overview:
Best Management Practices
• Bio-infiltration Basin• Stormwater Quality
Vault
• Enhanced Catch Basins• Rehabilitating Existing Storm
Water Treatment Units
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WisDOT STORM WATER
PROCESS
Hans Hallanger, P.E.Regional StormWater, ErosionControl & NoiseEngineer
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DOT – Southeast Region
Hans D. Hallanger, P.E. - DOT
Regional Stormwater, Erosion Control & Noise Engineer
DTSD SE Region - Environmental Services
141 NW Barstow StreetWaukesha, WI 53187
Phone: (262) 548 - 6706
Cell: (414) 750 - 1071
Email: [email protected]
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My Stormwater Background
Wet Ponds
Dry Ponds
Infiltration Basins
Bio-filtration Basins
Swales
Filter Strips
Catch Basins
Proprietary Water Quality Devices
Underground DetentionWater Quality Analysis using WinSLAMM
Erosion Control Best Management Practices (bmps)
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DOT Storm Water
Analysis/Design
Similar to any development
Water Quantity
Water Quality
Site Specific Solutions
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PROJECT STORM WATER
OVERVIEW
Hans Hallanger, P.E.Regional StormWater, ErosionControl & NoiseEngineer
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Location Challenges
Reminder
• Limited Real Estate
• Construction Costs and Budget Constraints
• Future Maintenance – Responsibility and Costs
• Regulations and Requirements
• Community Input
• Utilities
• Hazardous Materials
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Existing Conditions
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Existing Conditions
N
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Existing Conditions
W
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Existing Conditions
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Proposed Conditions –
Water Quality
Project Scope considered “Minor
Reconstruction”
Same Urban Footprint
No increase in impervious
No change in alignment
No increase in peak flows
TRANS 401 = Project Does Not requirereduction in Total Suspended Solids (TSS)
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Proposed Peak Flows –
Water Quantity
Peak Flow Controls Not Needed
No localized flooding
No increase in new impervious
Lake Michigan or Milwaukee Riverdownstream
Maintaining Existing Drainage Patterns and
Outfall Locations
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Project Features:
Bio-Filtration Basins (Mini Ponds)
Constraints Very Limited Open Spaces Premium Real Estate
Proposal – Bio-Filtration Basins 4 Basins were fit into available spaces $75,000
83% Total Suspended Solids Removal Treats 0.85 ac. of Freeway Green Space Appeal
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Bio-Filtration Basins - Locations
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Bio-Filtration Basins
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Bio-Filtration Basins
P j t F t
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Project Features:
Upgraded Catch Basin
107 sumped catch basins
$642,000
Treats 32 acres of Freeway 26% Total Suspended Solids Removal
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Catch Basin - Locations
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Catch Basin - Locations
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Project Features:
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Project Features:
Detention Vault
1 New Unit – South end of Bridge, nearLincoln Memorial Drive
$20,000
50% Total Suspended Solids Removal Treats 0.9 acres
4 foot deep sump with trapped outlet
Requires maintenance – clean out sumps
Similar to Catch Basin…but larger
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Hydrodynamic Separator and Water
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Hydrodynamic Separator and Water
Filtration Devices
MilwaukeeRiver
N
Hydrodynamic Separator and Water
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Hydrodynamic Separator and Water
Filtration Devices
Hydrodynamic Separator and Water
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Hydrodynamic Separator and Water
Filtration Devices
Hydrodynamic Separator and Water
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Hydrodynamic Separator and Water
Filtration Devices
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Storm Water Features Summary
Bio-Filtration Basins. $75,000. 83% TSS Upgraded Catch Basins. $642,000. 26 %
TSS
Wet Detention Vault. $20,000. 50% TSSMaintenance of Existing Vaults Replace
Cartridges. $3,000. 80% TSS
Maintain Treatment Unit. 20% TSS
Total BMP Cost = $ 740,000 Now Treating 32 acres vs. 0.25 acres
Huge Improvement in TSS Removal
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Keys for Success
Working together to provide improvements,when & where possible
Ensure proper operation of devices…..
MAINTENANCE
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Questions?