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Update on the Metro Nashville Consent Decree Program. Scott Potter Ron Taylor

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Update on the Metro Nashville

Consent Decree Program

Scott Potter

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2

Why We Are Here

• Planned actions to meet Clean Water Act

• The types of projects that will be constructed

• The impacts of these projects

• The costs of the Program

• The benefits of the Program

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What is a Consent Decree?

The consent decree is an agreement based on

enforcement for violations of the Clean Water

Act between the following parties:

• Metro • EPA

• U.S. Department of Justice

• Tennessee Department of Environment and Conservation

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Nashville is Not Alone:

Utilities with Consent Decrees

Atlanta $ 3 billion Birmingham $ 3 billion Cincinnati $ 1.5 billion Columbus, OH $ 2.5 billion Indianapolis $ 1.3 billion Louisville $ 850 million Northern KY San. $ 880 million Dist. No. 1

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Program Communication Plan

• Proactive communication to advise Council

Members in advance of project

• Community meetings as needed prior to

construction

• On-going neighborhood communications

during construction

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6

Combined and Separate Sewer Systems

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Frequently Used Terms

ISSUE: SSO – Sanitary Sewer Overflows PLAN: CAP/ER – Corrective ISSUE: CSO – Combined Sewer Overflow PLAN: LTCP – Long Term

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• 2 ½ years to develop plans:

̵ Corrective Action Plan / Engineering Report for SSOs Long Term Control Plan for CSOs

• 11-year implementation period after approval • Stipulated penalties:

̵ $1,000 / SSO occurrence

̵ $3,000 / SSO occurrence after December 2014

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• Corrective Action Plan / Engineering Report for SSOs – submitted September 2011

• Long Term Control Plan for CSOs – submitted September 2011

• Regulatory Response: none to date

• Implementation: Proceeding with key elements of the Program

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Progress in Reducing SSOs

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Corrective Action Plan / Engineering

Report – Sanitary Sewer Overflows

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CAP / ER

Sources of

Inflow and

Infiltration

(I / I)

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CAP / ER Sewer Defects Identified by Televised Inspection

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CAP / ER

Defects identified in MWS sewers

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CAP / ER

Hydraulic

Modeling for

2-year storm

event

61 permanent

and 144

temporary flow

monitors

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CAP / ER – Hydraulic Modeling

Hydraulic model identifies level of sewer

surcharge in manholes during 2-year storm event.

Project type alternatives modeled to reduce

surcharging to

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CAP/ER Project Types

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CAP/ER – Project Types

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CAP / ER Project Types

Inflow / Infiltration Reduction – Sewer Rehabilitation Cured-in-place Lining

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CAP / ER – Project Types

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CAP / ER – Project Types

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CAP / ER – Project Types

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Dry Creek Service Area

MWS

Sewer

Service

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Dry Creek Projects

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Conveyance Improvements: 7,900 feet (gravity)

22,900 feet (force main) Pumping Upgrades and Storage: 5 pumping

station upgrades and one 10 MG tank

Sewer Rehabilitation: 168,000 feet

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Whites Creek

Projects

Sewer Rehabilitation: 250,000 feet Storage Upgrades: 4 tanks totaling 31 MG Conveyance Upgrades: 43,900 feet

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26 26 Sewer Rehabilitation: 250,000 feet Conveyance Upgrades: 43,900 feet Storage Upgrades: 4 tanks totaling 31 MG

Whites Creek

Projects

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Central Projects

Sewer Rehabilitation: 1,250,000 feet

2 pumping station

upgrades and 6 storage tanks totaling 86 MG Conveyance Upgrades: 49,900 feet (gravity) 4,600 feet (force main)

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Mill Creek Trunk

• Six miles of upsized sewer, ranging from 72 to 102 inches in diameter

• Extends from south of Briley near I-24 to the existing Barker Road / Omohundro storage

facility

• Requires significant easement acquisition

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Mill Creek / Opryland Storage

• Phase I: 15 MG Barker Road / Omohundro

storage tank – existing • Phase II: New 15 MG

tank on existing property • Phase III: Four additional

15 MG tanks and 100 mgd pump station

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CAP

/

ER Cost Summary

Central 73% Dry Creek 10% Whites Creek 17% Conveyance 35% Pump Station 5% Rehabilitation 38% Storage 22%

Total CAP

/

ER Cost:

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Long Term Control Plan

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Combined Sewer Systems

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Nashville

Combined

Sewer

System

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32 CSO

sites in 1990

8 CSO sites

in 2009

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Water Quality Impacts

Mill Creek Whites Creek

Browns Creek Richland Creek

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Water Quality – Recreation Areas

Mill Creek Whites Creek Browns Creek Richland Creek Riverfront Park

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CSO Alternatives – Level of Control

Performance curves modeled to identify cost-effective controls for typical rainfall year:

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Public Input Highlights

Citizens Advisory Group and public meetings generated community input including:

Value and concern for the Cumberland River

Limit neighborhood impact

Balance investment for improvements with impact to

ratepayers

Priority for green solutions when appropriate

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Recommended Level of Control

CSO Site

Overflows

(typical year)

Driftwood 0

Boscobel 0

Benedict & Crutcher 2

Schrader 2

Washington 11

Kerrigan 9

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Washington

CSO Area

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Cost: $ 17 million Status: Operational

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Washington Level of Control

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Kerrigan

CSO Area

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Kerrigan CSO Discharge Site

Greenway

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Kerrigan Level of Control

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Green Initiatives for

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Green

Infrastructure

Proposed for

Combined

Sewer Area

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Proposed Green

Infrastructure Project

for Metro Parks

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Low Impact

Development

Manual

Requires

Capture for 1”

Rainfall

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Proposed MWS Incentive for Reducing

Runoff to Combined Sewers

Facilities installing green roofs would receive reduced sewer

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Cost Summary for Consent Decree

CAP / ER $ 770 M 68%

LTCP $ 300 M 26%

Sewer Rehab (non-CAP/ER) $ 70 M 6%

Total * $ 1,140 M 100%

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Cost Impact for Consent Decree

Developed cash flow needs for program

Impact: No immediate need for rate adjustment

Developing revenue study to address long-term

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Consent Decree Implementation

Revise CAP / ER and LTCP if necessary

Program Manager – CDM / AECOM

Construction Manager – GSP / CH2MHill

Project Set Designers:

5 Teams for equalization tanks and pumping stations 8 Teams for conveyance improvements

15 Teams for sewer rehabilitation 6 Teams for SBE engineering firms

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Questions

&

References

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