I-794/Hoan Bridge Project: Stormwater Treatment

8/9/2019 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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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 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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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

N


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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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Filtration Devices

MilwaukeeRiver

N



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Filtration Devices



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Filtration Devices



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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?

Documents

I-794/Hoan Bridge Project: Stormwater Treatment