cpac meeting 4-18-06

Program OverviewProgram Overview

Our Goal is to …Our Goal is to …

• Clean the sanitary sewage and return it to the river

• Send the rain water to the river

• Minimize the mixing of the two

EPA Consent DecreeEPA Consent Decree• Agreement between City and

the U.S. EPA

• This agreement is the resolution of an 11-year-old lawsuit

• More than 400 cities nationwide are under similar orders

• Approved by voters in July 2002

• Stiff penalties for missed deadlines

EPA Consent Decree EPA Consent Decree costscosts• Estimated at more than $450 million over a

15-year period

• Front-end loaded

• Largest capital projects occur in the first several years

Consent Decree Consent Decree RequirementsRequirements• The Consent Decree requires the following:

• Improvements to the WWTP

• Now under construction

• Control of sanitary sewer overflows

• Nearly complete

• Final phase of Point Place work

• Completing retention basin in River Road Park• Development and implementation of a Long Term

Control Plan for Combined Sewer Overflows (LTCP)

Consent Decree Consent Decree ImplementationImplementation

• WWTP improvements• 11 major projects• $140 million

• Sanitary Sewer Overflow Control• 13 major projects• $35 million

• Combined Sewer Overflow Control• 26 projects (planned)• Over $250 million (proposed)

WWTP ConstructionWWTP Construction

SSO Control ProjectsSSO Control Projects

CSO Long Term Control CSO Long Term Control PlanPlan

• Culmination of over two years of study

• Involved the public and stakeholders along the way

ObligationsObligations

• The consent decree requires that the LTCP evaluate a range of CSO control alternatives based on:• Pollution reduction benefits• Instream water quality conditions• Construction and operations costs

• The consent decree requires that work included in the plan be completed by August 31, 2016

Public Input for PlanPublic Input for Plan

• Public input included:• 2 community telephone surveys• 6 public meetings• 17 Community Program Advisory Committee

meetings devoted to the Long Term Control Plan

City’s Combined AreaCity’s Combined Area

Existing ConditionsExisting Conditions

• Currently 32 overflows

• 17 square miles of CSO area

• Discharge 33 times per year

• Discharge 625 million gallons per year

CSO Control Work has been CSO Control Work has been PerformedPerformed

• The City constructed three major tunnel systems to store excess flow

• The City has implemented a number of sewer separation projects to build separate sewer systems

CSO Area to TunnelsCSO Area to Tunnels

Sewer Separation Sewer Separation ProjectsProjects

Alternatives ConsideredAlternatives Considered

• Flow storage and/or treatment• Storage basins and tunnels with screening and other

treatment capability

• Sewer Separation• Construction of new sewers for eliminating

combined systems

• Flow reduction/rerouting• Small-scale measures to reduce the amount of flow

to the sewer system

Proposed PlanProposed Plan

• Reduces number of overflow locations from 32 to 23

• Reduces frequency from 33 to 4 (untreated)

• Reduces volume from 624 MG/year to 69 MG/year

• Reduces typical pollutant discharge by 86%-89%

• Reduces bacterial discharge by 90%

Proposed PlanProposed Plan

• Includes 26 projects• Estimated cost of over $250M (2005 dollars)• Reduces Ottawa River discharge to 2 times/

year• Reduces Maumee River discharge to 4 times/

year• Reduces Swan Creek discharge frequency to 3

times/year, disinfects the discharge that does occur

Expected Facility LocationsExpected Facility Locations

• Storage Basins• Joe E. Brown Park OR Windermere Blvd.• I – 280 / Front Street interchange area• Private property at Oakdale and Miami• City property next to I-75 on north side of Maumee

River

• Storage Pipelines• International Park• Adjacent to Jamie Farr Park

Plan for Ottawa RiverPlan for Ottawa River

Plan for Maumee River Plan for Maumee River (Upper)(Upper)

Plan for Maumee River Plan for Maumee River (Lower)(Lower)

Plan for Swan CreekPlan for Swan Creek

Facility LocationsFacility Locations

Sewer Separation/ Flow Sewer Separation/ Flow Reduction AreasReduction Areas

Implementation Time FrameImplementation Time Frame

• Ottawa River: 2006 – 2015

• Maumee River: 2006 – 2016

• Swan Creek: 2007 – 2016

Storage Basin ExamplesStorage Basin Examples

• Vast majority of work is below ground

• Will require above-ground building for support facilities

• Takes about 2 - 3 years to construct

Birmingham CSO basinBirmingham CSO basin

Leib Screening/ Disinfection Leib Screening/ Disinfection Facility - DetroitFacility - Detroit

Storage PipelineStorage Pipeline

• Essentially large sewer underground that will provide storage volume

• Small support building required in vicinity

• Takes 1 – 2 years for construction

Tunnel ImprovementsTunnel Improvements

• Improve tunnel hydraulics to reduce frequency

• Reduce flow area (Swan Creek South)

• Improve cleaning, other operations items

• Add disinfection capability

Project CostsProject Costs

• All costs are based on 2005 cost index

• Actual costs at implementation will be impacted by the rate of inflation and the final project design

• Estimated overall cost: >$250 million

• Rates will be impacted by timing of projects and financing method uses

What is Next?What is Next?

• Plan was submitted to U.S. EPA

• Waiting for EPA approval

Next MeetingNext Meeting

• Date