The document discusses options for a long term control plan to reduce combined sewer overflows (CSOs) into the Maumee River in compliance with a consent decree. It provides an overview of CSO volumes from different outfalls, describes various types of control alternatives like storage, treatment, and separation, and identifies potential sites for facilities. Public input is sought on the preferred alternatives and sites.

1. Maumee River (East Side) Public Meeting Long Term Combined Sewer Overflow Control Plan Input February 10, 2005

2. Discussion Agenda Program Overview Combined Sewer Overflows Maumee River Identification of Alternative Types Potential Siting of Control Facilities Opportunity for Input

3. CSO Control Planning The City must control CSO discharges according to the consent decree Alternatives are being evaluated with respect to their feasibility, associated benefits and costs Public input on alternatives considered is sought in tonight’s meeting

4. Project Timeline The Long Term Control Plan Document is scheduled to be submitted to USEPA in July 2005 A review and modification period will follow the plan submittal The work identified in the plan is to be completed by August 31, 2015

5. Combined Sewer Area Overview

6. Maumee River (East Side) Combined Area

7. Maumee River Overflow Frequency CSO # per Year 4 16 5 28 6 14 7 30 8 4 9 25

8. Maumee River Overflow Volume CSO Volume (MG) 4 7 5 30 6 5 7 77 8 1 9 115

9. Alternative Evaluation Alternative Evaluation is based on reducing the frequency of overflow to 0 – 12 times / year Total elimination of overflows would only occur in the most costly alternatives

10. Type of Alternatives Alternative selection is a combination of performance and suitability considerations There are a number of types of alternatives

11. CSO Control Options Storage – holds excess flow until capacity is available Treatment – cleans flow before it is discharged – disinfects and removes pollutants Separation – provides new sanitary or storm sewers so that combined sewers are eliminated Flow reduction / rerouting can enhance the above options

12. Storage Basin Facility Basic Information Type of facility: concrete tank either concealed or visible Land area required: 3 – 10 acres Typical siting locations: waterfront property, parks, other vacant parcels near rivers Other requirements: some sewer work to bring flow to the site; building for support functions

13. Basin Storage Facilities Storage alternatives can be below grade as basins or tunnels. Generally some access hatches or support structures are present.

14. Storage Basin Facilities – Pros and Cons Pros Most work is limited to one location and the adjacent areas are not disturbed Volume and frequency of discharge to the river is reduced Site can be designed to be aesthetically pleasing Cons Use of land for other activities is limited Construction activities are generally 2 – 3 years in duration limiting the use of sites during that period A building is required for support facilities Some untreated overflow will remain

15. Storage Tunnel Basic Information Type of facility: below ground tunnel Land area required: limited land requirements – most work is along a linear corridor and is not visible from the surface Typical siting locations: about 60 – 75 feet below grade; linear corridors (such as streets) Other requirements: drop shafts and discharge points with pump stations and control of floatables

16. Storage Tunnel Facilities – Pros and Cons Pros Most work is performed underground and at construction shaft locations, minimizing land needs Volume and frequency of discharge to the river is reduced Toledo has successfully constructed similar projects Cons Difficult to clean and access Some untreated overflow will remain A building would be required to house support facilities

17. Storage Tunnels Storage tunnels primarily consist of large underground pipes 12 – 15 feet in diameter. There are additional support structures that would be located at the end of the tunnel.

18. Treatment Facility Basic Information Type of facility: smaller concrete tank with screening and disinfection capability Land area required: 2-5 acres Typical siting locations: waterfront property, parks, other vacant parcels near rivers Other requirements: some sewer work to bring flow to the site; above ground building to house equipment

19. Treatment Facilities – Pros and Cons Pros Most work is limited to one location and the adjacent areas are not disturbed. Facility footprint is smaller than storage facility. Small storms are stored. Larger storms discharge partially treated water. Water that goes to the river has been treated for bacteria. Cons Treatment generally requires construction of a good size building, this building is larger than required for a storage only alternative due to more equipment. Facility is more complex to operate and maintain than a storage only basin.

20. Treatment Facilities Three large treatment facilities in the Detroit Area. These facilities generally require a fairly large building.

21. Sewer Separation Basic Information Constructs a new sewer to separate flow Generally requires 3 – 6 months to complete work on a street; 1 – 2 years to complete work in an area Generally doesn’t involve land acquisition

22. Sewer Separation – Pros and Cons Pros Upgrades the sewer system Eliminates CSO discharges Minimal property requirements Cons May increase total amount of pollutants to the waterways Disruptive to individual property owner

23. Sewer Separation Sewer separation requires construction of new sewers in areas where a single pipe system exists.

24. Flow Reduction/Rerouting – Pros and Cons Pros Addresses problem at the source Could be considered best environmentally Could reduce basement or surface flooding Cons Generally not adequate to solve the entire problem Most disruptive to individual property owners Administratively intensive program

25. Flow Reduction / Rerouting Photos

26. EPA Criteria The primary concern in other CSO Plans around the country is the frequency at which CSOs discharge The control of bacteria is important Other items of concern Volume of discharge Pollutants in discharge Measurable impacts on waterways

27. Siting Issues / Concerns Consider Areas of open space (sites), reasonably close to outfalls Current use of existing sites & associated impacts due to construction or long term use Ownership of sites “ Fatal flaws” such as environmental or geotechnical issues Opportunities for secondary benefit – e.g. brownfield reuse, coordination with other projects

28. Maumee (East Side) Potential Sites Potential sites Potential sites have been identified based on location of open space Currently evaluating the feasibility of these sites No decisions have been made about the use or non-use of any site

29. Locations for Potential Storage or Treatment

30. Potential Flow Reduction

31. Storage Basin Sizing – I-280 Right of Way Frequency of Overflow Required Storage Volume 0 per year 9 MG 1-3 per year 2 MG 4-7 per year 0.4 MG 8-12 per year 0.2 MG

32. Potential Sites – I-280 Right of Way

33. Storage Basin Sizing – Main St. & Nevada Overflows Frequency of Overflow Required Storage Volume 0 per year 20 MG 1-3 per year 8 MG 4-7 per year 3 MG 8-12 per year 1 MG

34. Potential Sites – International Park

35. Storage Basin Sizing – Oakdale Area Frequency of Overflow Required Storage Volume 0 per year 34 MG 1-3 per year 14 MG 4-7 per year 3 MG 8-12 per year 1 MG

36. Potential Sites – Oakdale Area

37. Storage Tunnel Alternative

38. Storage Tunnel Sizing Frequency of Overflow Storage Volume / Diameter 0 per year 63 MG 28 ft 1-3 per year 24 MG 17 ft 4-7 per year 6 MG 9 ft 8-12 per year 3 MG 6 ft

39. Evaluations Are Continuing Additional cost development and comparison to benefits are ongoing Better definition of potential sites and discussions with property owners / operators More technical evaluations (will support cost assessment)

40. How You Can Help Provide feedback on the alternative types through the various stations Let us know what you like and don’t like and the type of alternative Give us feedback on the potential sites Provide other comments on what is important to you Ask questions at the various station locations