Collection Systems are a critical part of Wastewater Infrastructure. The conveyance of sanitary sewer to the treatment plant must be completed efficiently and with no damage to property and the environment in general. Much of our existing pipelines, manholes, and lift stations were constructed many years ago and are starting to reach the end of their life cycle. This presentation covers only assessment, rehabilitation, and repair methods for gravity sewer systems. It was a 30 minute presetnation that I gave at an RMSAWWA/RMWEA PWO Seminar and consists of mostly pictures.

1. PWO Seminar
August 7, 2014
Collection
Systems
Discussion
Zachary B. Collins, PE, CWP, LEED AP, CDT

2. Introduction
 About Your Speaker
 Education and Professional Credentials
 Work History
 Networking and Volunteering
 Family and Free Time
 Presentation Topics
 What are the problems?
 How do we assess the problems?
 What are the solutions?
 What are the results?
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

3. Collection Systems
What are the problems?
 Rainfall induced Inflow and Infiltration
 Reduction in capacity
 Increased treatment Costs
 Blockages
 Property Damage
 Sanitary Sewer Overflows
 Money
 Being proactive has many unknowns
 Being reactive is expensive
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

4. Collection Systems
What does the EPA Say?
 “Sanitary sewer collection systems are designed to remove
wastewater from homes and other buildings and convey it to a
wastewater treatment plant. The collection system is a critical
element in the successful performance of the wastewater
treatment process. EPA estimates that collection systems in the U.S.
have a total replacement value between $1 and $2 trillion. Under
certain conditions, poorly designed, built, managed, operated,
and/or maintained systems can pose risks to public health, the
environment, or both. These risks arise from sanitary sewer overflows
(SSOs) from the collection system or by compromised performance
of the wastewater treatment plant. Effective and continuous
management, operation, and maintenance, as well as ensuring
adequate capacity and rehabilitation when necessary, are critical
to maintaining collection system capacity and performance while
extending the life of the system.” (EPA’s : Guide For Evaluating
Capacity, Management, Operation, And Maintenance Programs
At Sanitary Sewer Collection Systems)
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

5. Assessment of Pipes
 Closed Camera Video Inspection
 Smoke Testing
 Dyed Water Testing
 Air Testing
 Mandrel Testing
 Allowable Leakage Testing
 Flow Monitoring
 Hydraulic Modeling
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

6. CCTV
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

7. Smoke Testing
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

8. Collection Systems
Dyed Water Testing
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

9. Air Testing
Collection Systems
 4 psi start pressure with less than 0.6 drop
 Testing time depends on diameter
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

10. Rehabilitation and Repair of
Sanitary Sewer Mains
 Jet Balling / Pressure Washing / Root Cutting
 Pipe Liners
 Cure in Place Pipe
 PVC fold-n-form liner
 HDPE slipliner
 Spot Repairs
 Shot-crete
 Joint Sealing
 Service Connection Rehabilitation
 High Velocity Protection
 Pipe Replacement
 Directional Drilling
 Open Excavation
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

11. Collection Systems
Jet Balling, Power Washing, &
Root Cutting
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

12. Pipe Liners
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

13. Spot Repairs
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

14. Assessment of Manholes
 Visual Inspection
 Ring, Cover, and Grade Rings
 Access Hole and Steps
 Bench and Channels
 Pipe Connections and Invert Finish
 Base, Barrels, and Risers
 Field Testing
 Vacuum Testing
 Allowable Leakage Test
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

15. Collection Systems
Ring, Cover, and Grade Rings
 Access Space
 Inflow and Structural Integrity
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

16. Access Hole and Steps
 Steps or no steps?
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

17. Collection Systems
Benches and Channels
 Channel Geometry, Bench Drainage, etc.
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

18. Collection Systems
Pipe Connections and Invert
Grouting
 1-2” and smooth grouting for easy flow
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

19. Collection Systems
Base, Barrel, and Risers
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

20. Vaccum Testing
Collection Systems
 Minimum 10” Hg start pressure
 Less than 1” drop in 1 minute
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

21. Collection Systems
Rehabilitation and Repair of
Manholes
 High velocity protection
 Structural Repairs
 Interior Lining
 Partial or Full Replacement
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

22. Collection Systems
High Velocity Protection
 Incoming pipe at High Grade and/or
sharp change in alignment
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

23. Structural Repair
 Combination of
Grout/Concrete
patching and a spray-on
or inserted liner
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

24. Interior Lining
Collection Systems
 Concrete/Grouting, Fiberglass, Plastic, etc.
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

25. Collection Systems
Partial or Full Replacement
When the previous design or construction
was incorrect or the structure or pipe is just
too deteriorated to rehabilitate…CALL the
ENGINEER!
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT

26. Conclusion and Questions
 Pipe Assessment and Rehabilitation
 Manhole Assessment and Rehabilitation
 Questions?
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT