1. Sewer System Presentation
Village of La Grange
Informational Meeting
October 18, 2010

2. Sewer System Presentation
Local Sewer System
Regional Sewer System - MWRD
Private Property Facilities
Question and Answer

3. Sewer System Presentation
Presenters
~ Ryan Gillingham, P.E., Director of Public Works
~ Mike Bojovic, Asst. Director of Public Works
~ Tom Heuer, P.E., President, Heuer & Associates
~ Terry O’Brien, President, Metropolitan Water Reclamation District of Greater Chicago
~ Manju Sharma, P.E., Acting Director of Maintenance and Operations, Metropolitan Water Reclamation District of Greater Chicago
~ Patrick Benjamin, Director of Community Development
Tom – Served as Village Engineer for approximately 20 years
Manju – Worked for District for 22 years.
Sanjay Patel - In charge of maintenance and operation of Collection Systems for the Stickney Basin
3. Joseph Kratzer - Design Engineer.
4. Ed Staudacher - Supervising Engineer in charge of waterways operations.

4. Local Sewer System Overview of Village’s sewer system
Detailed system operations and relationship to MWRD and Deep Tunnel
Summer rain events
Response to rain events
On-going maintenance activities
Sewer improvement studies and long range plans

5. Local Sewer System The sewer system includes … ~ 38 miles of
combined sewers
~ 7 miles of
sanitary sewers
~ 23 miles of
storm sewers
with pipe sizes ranging
between 8” and 72”

7. Local Sewer System
Sewer systems were first installed in La Grange in the 1880’s
These early systems were constructed to collect storm water and sanitary waste in a single pipe
Limitation of these combined sewer systems were recognized in the early 1900’s, as increasing urban density created water pollution problems
By the 1930’s most new sewer systems were being designed with separated storm and sanitary sewers
Older communities with combined sewers are forced to deal with the limitations of these systems

8. Local Sewer System
The La Grange sewer system was constructed to operate by entirely gravity without the use of pumps, valves, or gates.
The sewer system was constructed to outlet to Salt Creek; initially using available streams and ditches, and later through constructed pipe systems.
Village operated a wastewater treatment plant to process dry weather flows until around 1930, when the MWRD extended the regional interceptor sewer system from its large treatment plant in Stickney.

9. Local Sewer System
All dry weather wastewater flow generated by the Village is collected by the MWRD interceptor system and processed at the Stickney treatment plant.
Most wet weather flow generated by the Village is collected by the MWRD Deep Tunnel system (TARP) and processed at the Stickney treatment plant.
When the capacity of TARP is exceeded, the system is constructed to overflow to Salt Creek
1. Dry weather flow from La Grange – 1.8 MGD to 2.3 MGD

10. Local Sewer System What are the different types of “flooding”?
Combined sewer backup
Street flooding (Restrictors)
Overland flow
Foundation seepage
Rear yard flooding

11. Combined Sewer
Backup
_______________
Without Flood Control

12. Combined Sewer
Backup
_______________
With Overhead Sewers

13. Combined Sewer
Backup
_______________
With Check Valve System

14. Combined Sewer
Backup
_______________
With Standpipe

15. Local Sewer System 2010 Rain Events Major Events occurred:
June 2, 2010
June 23, 2010
July 24, 2010
August 3, 2010

16. June 2, 2010 Total – 2.26” Peak Hour – 0.78”
Local Sewer System
June 2, 2010
Total – 2.26”
Peak Hour – 0.78”

17. June 23, 2010 Total – 2.12” Peak Hour – 1.32”
Local Sewer System
June 23, 2010
Total – 2.12”
Peak Hour – 1.32”

18. July 24, 2010 Total – 6.83” Peak Hour – 1.34”
Local Sewer System
July 24, 2010
Total – 6.83”
Peak Hour – 1.34”

19. August 3, 2010 Total – 2.08” Peak Hour – 0.94”
Local Sewer System
August 3, 2010
Total – 2.08”
Peak Hour – 0.94”

20. Local Sewer System July 24, 2010 Storm
100-year storm – (1% probability of occurring in any given year)
All areas of the Village were impacted
Combined sewer backups
Street flooding
Overland flow issues

21. July 24, 2010
_______________
Calls received related to flooding

22. Local Sewer System Major Storm Issues on 7/24/10
Combined Sewer Backups
Overland Flow South of 47th Street

23. July 24, 2010
_______________
Overland flow issues in the area south of 47th Street

24. Response To Summer Rain Events
Local Sewer System
Response To Summer Rain Events
Responded to individual residents with and individual property visits
Coordinated with FEMA and disseminated information
Initiated and completed sewer cleaning and televising program
Public meeting

25. 2010 Sewer Televising Program
Local Sewer System
2010 Sewer Televising Program
Cleaned and televised 35,000 feet of sewer
Areas centered on south of 47th Street and north west corner of Village
No collapsed pipes or complete blockages were discovered
Several areas were identified for repair and will be scheduled as part of a future repair program

26. 2010 Sewer Televising Program

27. Operation and Maintenance
Local Sewer System
Operation and Maintenance
Continue with sewer cleaning and televising program
Identify repairs
Remove debris within pipe
Assess condition
Removal of debris from top of catch basins in storm
Contact Public Works
Maintain restrictors within catch basins to ensure proper operation
Continue with sewer lining program to replace aging infrastructure

28. Sewer Improvement Studies and Long Range Plans
Local Sewer System
Sewer Improvement Studies and Long Range Plans
Goals and Objectives
Add capacity to the Village’s sewer system to handle larger rain events
Correct poorly functioning sewer segments
Identify other issues contributing to loading on sewer system

29. Sewer Improvement Studies and Long Range Plans
Local Sewer System
Sewer Improvement Studies and Long Range Plans
Regional Village Projects
Maple Avenue Relief Sewer (MARS)
Ogden Avenue Relief Sewer (OARS)
Area South of 47th Street
Neighborhood Projects
Poplar Place Drainage Investigation
Sunset / Elm Intersection Drainage Investigation

30. Local Sewer System M A R S
The Maple Avenue Relief Sewer concept was developed in 2005 and presented to Village Board at the 2006 Capital Improvement Projects Workshop.
The Board adopted the MARS concept and added it to scope of work being planned for the Bluff Avenue reconstruction project.
In 2008 the Bluff Avenue project was divided into three stages to apportion cost and to make application for available grant funding.
The construction of the initial outlet stage of the MARS sewer, connecting to the Deep Tunnel system, was started in 2009 and completed in 2010.

31. Local Sewer System O A R S
The Ogden Avenue Relief Sewer concept was developed in 1999 during the planning for the reconstruction of Tilden Avenue. Although funding was not available, provisions were made for a future connection to the Deep Tunnel system.
The concept was formally presented to Village Board at the 2006 Capital Improvement Projects Workshop and adopted subject to further refinement and coordination in conjunction with other improvements being planned in the area adjacent to the Ogden Avenue corridor.
The project is presently under study to finalize the design service area and other system characteristics need to proceed with more advanced planning.

32. Local Sewer System Ogden Avenue Relief Sewer
Service Area Approximates 50 Acres

33. Local Sewer System South Drainage Basin
As a result of the significant rainfall that occurred on July 24, severe flooding caused damage to numerous residential properties. The flooding was particularly significant in the region of the Village located south of 47th Street.
In consideration of this situation the Village Board authorized a special study of the south drainage basin to determine causes and remedies.
The engineering study is still in progress at this time.

34. Local Sewer System
South
Drainage
Basin

35. Local Sewer System Drainage Areas
560 Acres – Tributary to Cossitt Avenue Sewer (Existing)
255 Acres – Tributary to MARS (Proposed)
1. The drainage areas of MARS is approximately 34% of the Village.

36. Maple Avenue Relief Sewer
Local Sewer System
Maple Avenue Relief Sewer
Essentially the project doubles the pipe capacity during wet weather flows.
While the drainage area for the relief sewer is confined to the pink area, any sewers that are downstream would benefit from the reduction in wet weather flow.

37. Local Sewer System How it works …
During dry weather the waste water flow is conveyed by the combination sewer system to the MWRD interceptor system.
During periods of wet weather, the combination sewers receive and convey the combined sanitary and storm water to a special diversion structure.
Within the diversion structure a large portion of the wet weather flow is diverted to the deeper relief sewer to provide relief for the downstream sewer system.
The relief sewer conveys the diverted flow to the MWRD deep tunnel system.
The combination sewer system conveys the remaining flow along the existing travel path to the interceptor sewer.
Plan view – looking down
When possible separate storm sewers would be connected into relief sewer

38. Local Sewer System How it works …. Plan view – looking down
When possible separate storm sewers would be connected into relief sewer

39. Local Sewer System Current Status
First stage of MARS incorporated into Bluff Avenue Reconstruction Project Stage 2
Relief sewer will provide storm water drainage for Bluff Avenue Stage 3 and provides backbone for future MARS extensions
70% of project funded through federal grant

40. Bluff Avenue - Stage 2 Construction
Local Sewer System
Bluff Avenue -
Stage 2 Construction

41. Local Sewer System
Construction
1992 Deep extended at East & Cossitt

42. Local Sewer System Future …
When Bluff Avenue – Stage 3 is completed, storm water from 22.4 acres tributary to Bluff Avenue will flow directly into MARS
Village Board approved MARS preliminary engineering study in July 2010 to plan for future extension
Next Steps…
Complete preliminary engineering, including hydraulic analysis and layout for future MARS alignment
Prepare construction cost estimates for budgeting
Report completion anticipated November 2010

43. Local Sewer System Next steps for the long term plan ……
Complete engineering studies for three regional Village drainage areas
Present findings and recommendations to Village Board for consideration as part of the Capital Project Budget process in January
Continue identifying solutions to increase capacity and reduce the potential for flooding within the Village

44. Local Sewer System Conclusions ...
Village’s combined sewer system has limited capacity
Multiple rain events this summer exceeded the capacity of this system
Resulting flooding was not the due to operational or maintenance issues with sewer system
Future projects to increase conveyance and storage capacity within sewer system are being planned and implemented
Future projects would have finite capacity

45. Local Sewer System Local Sewer System Regional Sewer System - MWRD
Private Property Facilities

46. Local Sewer System Local Sewer System Regional Sewer System - MWRD
Private Property Facilities