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

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

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

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

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

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

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

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

Manhole Connections or Rehab Work

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

Flow-thru Tubing Manhole Work

Flow-thru Tubing Manhole Work

Key: No Sewer Spills Rehabilitation – Bypass Pumping

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

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

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

Bypass Pump Set Up

Bypass Piping

Spill/Response Plan; Noise; Odor; & Monitoring

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

QUESTIONS Maintaining Sewage Flow During Construction Activities