1. PRESENTATION FOR CWEA TRAINING Keys to Successful Pipeline/Infrastructure Projects Pipeline Flow Diversion Presented by: Tom Epperson, PE, Tetra Tech

2. Pipeline Flow Diversion Keys to Successful Pipeline/Infrastructure Projects Tom Epperson, PE, Tetra Tech

3. Connections to Existing Sewer Manhole Connections or Rehab Work Rehabilitation – Bypass Pumping Maintaining Sewage Flow During Construction

4. Construct New MH over Existing Pipe Keep Flow within Pipe Modify Channel/Base Cut and Remove Top of Existing Pipe Connection to Existing Sewer – Maintain Sewage Flow

5. 1.Existing Sewer Pipe Connection to Existing Sewer – Maintain Sewage Flow

6. 1.Existing Sewer Pipe 2.Add Manhole Base & Shaft

7. Connection to Existing Sewer – Maintain Sewage Flow 1.Existing Sewer Pipe 2.Add Manhole Base & Shaft 3.Modify Channel & Side Pipe

8. 1.Existing Sewer Pipe 2.Add Manhole Base & Shaft 3.Modify Channel & Side Pipe 4.Cut & Remove Top of Pipe Connection to Existing Sewer – Maintain Sewage Flow

9. Manhole Connections or Rehab Work

10. Key Issues: MH Access (cover size) Confined Space Entry Sizing of Flow-thru Tubes Confirmation of Back-up Manhole Connections or Rehab Work

11. Flow-thru Tubing Manhole Work

12. Flow-thru Tubing Manhole Work

13. Key: No Sewer Spills Rehabilitation – Bypass Pumping

14. Bypass Pumps Bypass Piping Redundancy Spill Prevention & Response Plan Noise Monitoring Odor Monitoring Monitoring Systems Key Elements of Bypass Plan

15. Capacity – Typical Sewage Flow & Peak Flow Rate Suction Supply Pumping Equipment (submersible, self- priming centrifugal) Valving Bypass Pumps

16. Capacity – Typical Sewage Flow & Peak Flow Rate Weekly Flow Trend

17. Bypass Pump Set Up

18. Bypass Piping

19. Spill/Response Plan; Noise; Odor; & Monitoring

20. Confirm Capacity Location of Bypass Pumping & Piping Traffic Control Duration of Bypass Contractor Submittals: bypass plan, noise, odor, monitoring, and redundancy Key Design Issues

22. QUESTIONS Maintaining Sewage Flow During Construction Activities