Homestead Valley Sanitary District Sanitary Sewer Overflow ...
Rehabilitation and Repair of Sanitary Sewer Collection Systems
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Transcript of Rehabilitation and Repair of Sanitary Sewer Collection Systems
Collection Systems Discussion
PWO Seminar
August 7, 2014
Zachary B. Collins, PE, CWP, LEED AP, CDT
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
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
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
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)
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
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
CCTV
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Smoke Testing
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Dyed Water Testing
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
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
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
Jet Balling, Power Washing, & Root Cutting
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Pipe Liners
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Spot Repairs
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
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
Ring, Cover, and Grade Rings Access Space Inflow and Structural Integrity
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Access Hole and Steps Steps or no steps?
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Benches and Channels Channel Geometry, Bench Drainage, etc.
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Pipe Connections and Invert Grouting
1-2” and smooth grouting for easy flow
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Base, Barrel, and Risers
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Vaccum Testing Minimum 10” Hg start pressure Less than 1” drop in 1 minute
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
Rehabilitation and Repair of Manholes High velocity protection Structural Repairs Interior Lining Partial or Full Replacement
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
High Velocity Protection Incoming pipe at High Grade and/or
sharp change in alignment
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
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
Interior Lining Concrete/Grouting, Fiberglass, Plastic, etc.
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
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!
Collection Systems
August 7, 2014 Zachary B. Collins, PE, CWP, LEED AP, CDT
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