HomeMy WebLinkAboutCMOM Presentation 11-8-19Capacity Management Operations and Maintenance
State of the Systems
Agency Representatives:
City of Eugene
Sub-Surface Operations Manager | Rob Hallett
Civil Engineer | Patrick Cox
Associate Engineering Technician | Jennah Maier
Principal Civil Engineer | Doug Singer
City of Springfield
DPW Operations Director | Brian Conlon
Operations Supervisor | Keith Miyata
Engineering Division Manager | Jeff Paschall
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What is CMOM? An adaptive plan to achieve effective collection system operations
Over-arching goal of CMOM is sanitary sewer overflow (SSO) prevention
CMOM has two approaches: Capacity Management and Operations Maintenance
2 Cities, 1 Goal
CMOM framework is useful for capital improvement as well as Operations strategies
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Hydro-jet cleaning
Flow monitoring
CCTV inspection
Pipe repairs
Smoke/dye testing
Root and foreign debris removal
O & M Activities
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Root Removal
Hydro-Jet Cleaning
O & M Activities
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CCTV Pipe Repairs
Smoke Testing
O & M Activities
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Master Planning and GIS
Flow-Monitoring and I & I Detection
Prioritize Wastewater Rehab Projects
Construct Wastewater Rehab Projects
Quantifying I & I Reduction
Capacity Management Activities
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Master Planning & GIS
Eugene’s next step in modeling the system is to add definition or granularity to the model, adding “mirco-basins” to further identify where the worst problems are within a basin to even
better target expenditures.
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Flow Monitoring + I & I Detection
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Prioritize Rehab Projects Applying Decision Criteria
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Construct Rehab Projects
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Quantifying I & I Reduction
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Eugene manages 682 miles of wastewater mains
Wastewater model calibrated to three seasons of data
About 200 miles of wastewater mains are concrete and over 50 years old
Eugene rehabilitates about 2 miles of mains per year
Ownership of laterals in right-of-way (since 2017)
2019(?) Wastewater Master Plan
City of Eugene Status
Public Works Engineering manages the I&I Identification and Rehabilitation through flow monitoring and capital rehabilitation projects. (692 miles, 27 local pump stations, 20,000 manholes)
Why is “over 50 years old” important? Prior to the mid-1970’s, wastewater pipe was primarily constructed with concrete, clay or transite. While these materials are generally good for
this use, they are subject to corrosion and deterioration of the jointing materials allowing ground water to infiltrate. Investigations and modeling of the older parts of the system
indicate that a majority of I/I is coming from these older pipes. Today’s materials of PVC, HDPE and ductile iron are chemically resistant and have superior jointing materials. By
2029, we expect that quantity of older pipe needing to be rehabilitated will level out at about 1.5 million feet of mainline pipe.
Cured-In-Place Pipe Lining
Lateral Lining
Chemical Grouting of Laterals
Manhole Sealing
Pipe Bursting
Reconstruction
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Budget Constraints
PWE - system is aging faster than we can rehab it
PWM - now maintaining ROW laterals as well as mainline pipe
Structural Rehab vs I & I Reduction
Risk Base Project Selection
Eugene Next Steps
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Springfield manages 245 miles of wastewater mains – 16 pump stations – 4900 maintenance access points
Replaced more than 3,500 linear feet of sanitary sewer pipe and replaced 10 maintenance access points in FY19
Utilized output from updated model to identify section of 27” trunk line for rehabilitation in 2020
Redeployed 15 flow monitors in anticipation of upcoming micro-modeling efforts
Updating the collection system hydraulic model with completion in October 2019
Anticipate Master Plan update kick off in early 2020
City of Springfield Status
Speak to experience with SSOs; re-evaluating decision criteria for strategic system rehabilitation
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Continue robust preventive maintenance activities
Complete collection system hydraulic model analysis
Begin Wastewater Master Planning and Development
Continue micro-basin modeling that will help interpret pre and post capital projects aimed at I & I reduction
Begin conversations with policy makers regarding potential I & I impacts from private laterals
Springfield Next Steps
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Questions
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