1. Water Main Rehabilitation Cured-In-Place-Pipe Technology
4th Street Water Main Lining Project
Jason Cook, PE, PMP

2. AGENDA General Construction Sequence Project Background
Preliminary Engineering
Final Design Efforts
Construction
Key Takeaways/ Lessons Learned

3. GENERAL CONSTRUCTION SEQUENCE
Locate and verify pipe size
Install temporary bypass system
Excavate access pits
Cut, clean, and inspect existing main
Map and plug all service connections
Wetout, install, and cure liner
CCTV inspection of liner
Hydrostatic testing

4. GENERAL CONSTRUCTION SEQUENCE
Reinstate services
Disinfect newly lined main
Reconnect water distribution system
Remove temporary bypass and restore site

5. PROJECT BACKGROUND Pilot Project for CFPUA Is CIPP a viable option?
Can it mitigate typical construction impacts?
When and where else should it be considered?
CFPUA is familiar with CIPP of gravity sewers

6. PROJECT BACKGROUND Project Location
4th St. between Castle St. and Willard St.
Established urban area of downtown Wilmington, NC.
Encroachment on multiple right-of-ways:
City of Wilmington
NCDOT
CSX
Project Area

7. PROJECT BACKGROUND Numerous above/below ground utilities:
Sanitary Sewer
Stormwater
Gas
Telecom
Power, etc.
Historical site features:
Brick Roadways
Granite Curb
Old Growth Trees, etc.

8. PROJECT BACKGROUND Water Main Characteristics
12” CI installed in mid-1960’s.
Mostly straight alignment.
Residential service and branch main connections.
History of maintenance requirements.

9. PRELIMINARY ENGINEERING
Is CIPP a viable option?
Establish key design considerations
Overall condition of the existing main?
General alignment of the existing main?
Number/location of valves, hydrants, fittings, etc?
Working pressure of existing main?
Semi-structural or fully structural liner per AWWA M28?
Quantity and type of service connections?

10. PRELIMINARY ENGINEERING
Tools and Available Resources
As-built drawings
GIS information
Field survey
Water system model
Maintenance records
Discussions with operations

11. PRELIMINARY ENGINEERING
CIPP Product Requirements
NSF 61 certification
Class IV per AWWA M28
Exceed system operating pressures
Future tapping

12. PRELIMINARY ENGINEERING
Available CIPP Products
AquaPipe by Sanexen
RS Blueline by RS Technik
NordiPipe by Sekisui
InsituMain by Insituform

13. PRELIMINARY ENGINEERING
Additional Preliminary Engineering Steps
Cost Comparison between CIPP & Open Cut
Manufacture estimates, past experience, etc.
Isolation options & temporary water setup
Permitting requirements

14. PRELIMINARY ENGINEERING

15. FINAL DESIGN EFFORTS Need a Clearer Picture SUE and Survey
How far should we go?
What has changed?
Notable site characteristics:
Location/depth of existing utilities
Unique system connections
Historical elements
System isolation options

16. FINAL DESIGN EFFORTS Locate Access Pits
What are system reconnection requirements?
What are the maximum lining lengths?
What impacts will result from access pits?
Traffic control
Existing utilities
R/W encroachment

17. FINAL DESIGN EFFORTS

18. FINAL DESIGN EFFORTS
Traffic Impacts

19. FINAL DESIGN EFFORTS Permits and Agency Approvals NCDOT NC DEQ
Public Water Supply
Erosion & Sediment Control
City of Wilmington
Engineering (right-of-way, streets cuts)
Fire Department
CSX

20. FINAL DESIGN EFFORTS Bidding and Award Approval Criteria
Licensed/Certified Installer
40,000 LF of similar size in past 3 years
Bid Structure and Range
Base Bid, Alt #1 and Alt #2
$1.3M, $1.9M, and $5.1M

21. CONSTRUCTION Locate and verify pipe size
Unlined Cast Iron Cement Lined Cast Iron

22. CONSTRUCTION
2. Install temporary bypass system

23. CONSTRUCTION
3. Excavate access pits

24. CONSTRUCTION
4. Cut, clean, and inspect existing main

25. CONSTRUCTION
5. Map and plug all service connections

26. CONSTRUCTION
6. Wetout, install, and cure liner

27. CONSTRUCTION
6. Wetout, install, and cure liner (cont.)

28. CONSTRUCTION
6. Wetout, install, and cure liner (cont.)

29. CONSTRUCTION
7. CCTV inspection of liner
8. Hydrostatic testing

30. CONSTRUCTION
9. Reinstate services

31. CONSTRUCTION 10. Disinfect newly lined main
11. Reconnect water distribution system

32. CONSTRUCTION
12. Remove temporary bypass and restore site

33. KEY TAKEAWAYS & LESSONS LEARNED
Key Project Drivers
Configuration of Distribution System
Influence number pits required
System isolation and temporary water requirements
Location of Distribution System
Permitting (R/W encroachments, city/state requirements)
Paving and site restoration requirements
Traffic impacts

34. KEY TAKEAWAYS & LESSONS LEARNED
Key Project Drivers (cont.)
Condition of Distribution System
Semi-structural or fully-structural liner
Existing valve operation
Variation in system materials
Operation of Distribution System
System operating pressures
CIPP liner thickness
NSF 61 certification
Future tapping of lined main

35. KEY TAKEAWAYS & LESSONS LEARNED
Risk of cost variance
Weather can change lining operation procedures
Plan for temporary water impacts
Testing of the installed liner is a must

36. QUESTIONS Jason Cook, PE, PMP Jeff Theberge, PE