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Successfully Developing & Managing Wastewater Pipeline/ Manhole Condition Assessment & Rehabilitation Programs Presented from a municipal perspective…. Presented by : Jeff Maier, P.E. Metro Wastewater Reclamation District Denver, Colorado. The challenges municipalities are facing:.

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Successfully Developing & Managing Wastewater Pipeline/ Manhole Condition Assessment & Rehabilitation ProgramsPresented from a municipal perspective…

Presented by:

Jeff Maier, P.E.

Metro Wastewater Reclamation District

Denver, Colorado

the challenges municipalities are facing
The challenges municipalities are facing:
  • ASCE’s 2009 Report Card for America’s Infrastructure:Grade for Wastewater Infrastructure is a “D –”
  • Cost effective asset management programs are more important than ever
  • Doing more with less is the new normal
  • Tighter EPA & CDPHE regulations
  • Funding issues & aging systems
the importance of condition assessment and rehabilitation
The importance of condition assessment and rehabilitation
  • Understanding your system is vital – wastewater infrastructure is crumbling!
  • Out of site, out of mind is no longer acceptable
  • Critical component of successful asset management and budgeting
  • Regulatory compliance issues
  • Operation & Maintenance requirements
  • Knowledge about your system = good decision making
benefits of effective condition assessment and rehabilitation
Benefits of effective condition assessment and rehabilitation
  • Reduces overflows, violations & failures
  • Prioritizes repair and maintenance efforts
  • Reduces emergency repairs or dig & replace
  • Modern technologies utilize trenchless condition assessment and rehabilitation techniques
  • Can save a lot of money!
attributes of a successful condition assessment rehab program
Attributes of a successful condition assessment & rehab program
  • Goals and responsibilities are defined
  • Organized & methodical
  • Administered by qualified staff and/or consultants
  • Uses available modern technologies
  • QA/QC is paramount
  • Reduces risk
  • Helps asset management & maintenance efforts
  • Improves capital expenditure planning
condition assessment technologies management techniques available
Condition Assessment Technologies & Management Techniques Available
  • CCTV inspection
  • Advanced Pipe Condition Assessment Systems (Redzone, Cleanflow, PPR, etc.)
  • Pole Cameras
  • Manual and Entry Inspection Methods
  • Database systems for inspection information storage
  • GIS interfaces & state-of-the-art inspection software
  • Consistent rating systems (NASSCO’s PACP & MACP)
rehabilitation technologies available
Rehabilitation Technologies Available

Pipeline Rehabilitation:

  • CIPP Lining
  • UV-Cured CIPP Lining
  • Sliplining
  • Fold & Form Sliplining
  • Structural Epoxy lining
  • Spiral-Wound & Panel lining
  • Cementitious lining
  • Trenchless Point Repair Methods

It’s critical to understand each

of the technologies; especially

strengths & limitations.

rehabilitation technologies available8
Rehabilitation Technologies Available

Manhole Rehabilitation:

  • Epoxy Coating/ Lining
  • Poly-Urea Coating/ Lining
  • Urethane Coating Lining
  • Calcium Aluminate Mortar
  • Cured in Place Liners
  • Fiberglass Inserts
  • HDPE Manhole Inserts
  • Cementitious Lining
  • Polymer Mortars
metro wastewater s interceptor manhole condition assessment rehab program
Metro Wastewater’s Interceptor & Manhole Condition Assessment & Rehab Program
  • Systematic, consistent, & cost-effect approach to assessing & rehabilitating

pipe and manhole conditions

  • In-house developed program
  • Collaborative effort between Engineering, Comprehensive Planning, and Operations & Maintenance (O&M) Departments
  • Balances operational, financial, and engineering needs
metro wastewater s interceptor manhole condition assessment program
Metro Wastewater’s Interceptor & Manhole Condition Assessment Program
  • Pipes inspected mainly by using CCTV
  • In-house CCTV using MWRD crews
  • 5-category pipe condition rating system
  • 3-category manhole condition rating system
  • Manholes surface & entry inspected
  • Utilizes advanced condition assessment technologies

Program utilizes customized database system and GIS interface

defined departmental roles workflow
Defined Departmental Roles & Workflow
  • O&M Department – Televise pipelines (CCTV), inspect manholes/ structures, enter inspection info into database, initial condition rating
  • Engineering Department – Review CCTV footage, follow-up inspection of manholes, assign final condition rating, generate prioritization list & reports, design & manage rehabilitation project, research new technologies
  • Comprehensive Planning – Review rehabilitation prioritization lists & reports, update & manage Capital Expenditure Schedule

Interdepartmental Cooperation & Responsibility: Results in successful in-house condition assessment and rehabilitation program.

program components cctv inspection
Program Components: CCTV Inspection
  • CCTV video inspections: Minimum of 10% of pipe segments annually
  • 10 year video cycle for entire interceptor system
  • CCTV work performed in-house by O&M Department crews
  • In-house CCTV ensures consistency, eliminates scheduling issues, & ultimately saves money
  • Customized 5-category rating system
program components cctv review condition rating classification reporting
Program Components: CCTV Review, Condition Rating Classification & Reporting
  • 5-category CCTV review criteria developed in-house
  • Rating criteria based on reinforced concrete pipe (RCP) conditions, but can be applied to all pipe materials
  • Rating system is comparable to NASSCO’s Pipeline Assessment & Certification Program (PACP), but meets specific needs of MWRD
  • Specific definitions of each category define rehabilitation urgency and time frame for rehabilitation completion
program components cctv review condition rating classification reporting14
Program Components: CCTV Review, Condition Rating Classification & Reporting

Good – No rehab at this time, maintain 10 yr cycle

Fair – No rehab at this time, maintain 10 yr cycle

Fair-Poor – Rehab may be necessary (5-10 yrs)

Poor – Rehab is necessary (2-5 yrs)

Very Poor – Rehab needed ASAP (0-2 yrs)

PipelineRehabilitation report cost estimates based on condition ratings of Fair-Poor, Poor, and Very Poor only.

program components manhole structure inspection
Program Components: Manhole/ Structure Inspection

Manhole surface & entry inspection examples:

program components manhole structure condition rating classification reporting
Program Components: Manhole/ Structure Condition Rating Classification & Reporting

Good – No rehab at this time, maintain 10

year inspection cycle

Fair – No rehab at this time, maintain 10 year

cycle, monitor as needed

Poor – Rehabilitation is necessary (1-3 yrs)

program components gis mapping
Program Components: GIS Mapping

Example GIS Map & Legend

program components interceptor infrastructure system database iis
Program Components: Interceptor Infrastructure System Database (IIS)
  • CCTV & Manhole inspection data maintained real-time in IIS database
  • IIS database developed in-house
  • Oracle based system
  • Manages inspection data, physical

pipe & manhole info, and GIS system

  • Streamlined condition assessment program
  • Access searchable pipe & manhole/ structure condition information
program components supplemental pipe coring activities
Program Components: Supplemental Pipe Coring Activities
  • Core drill sampling on selected pipe segments
  • Coring used to confirm remaining pipe thickness
  • Candidates for coring are pipe segments that may be rated in either category (i.e. fair-poor or poor)
  • Coring work done by outside contractor
  • Info entered into IIS database, compare to existing data & reevaluate current condition rating
  • Samples used to verify & check CCTV rating system
research development new condition assessment technologies
Research & DevelopmentNew Condition Assessment Technologies
  • Ongoing research of non-destructive methods to determine pipe condition & wall thickness
  • Laser profiling, sonar systems, & combo assessment technologies (RedZone, CleanFlow. PPR)
  • Will replace supplemental coring
  • Will help improve rehabilitation prioritization

CCTV will still provide majority of inspection information (CCTV ~90%, new method ~10%)

research development testing product evaluation
Research & DevelopmentTesting & Product Evaluation
  • MWRD’s 6-Step Manhole/ ConcreteRehabilitation Product Evaluation Program
    • In-house developed program
    • Evaluates products and applicators
    • Helps ensure QA/QC
  • Severe Wastewater Analysis Test (SWAT)
    • Evaluates coating/lining effectiveness & longevity in severe wastewater headspace environments
    • Laboratory and real-life test comparisons
    • Accelerated test chamber & electrical impedance tests
long term capital expenditure planning
Long-term Capital Expenditure Planning

Interceptor Pipes

  • Assumes pipes will be rehabilitated with CIPP lining for cost estimating purposes
  • Other rehab methods considered during design (slip lining, fold & form, epoxy-lined, etc.)
  • Cost estimates based on past MWRD rehab projects
  • Historical CIPP cost data for pipe sizes 8”-60”
  • Current MWRD CIPP cost estimate data (installed price):

8”- 30” = $3.75 per in/ft

31” – 41” = $4.50 per in/ft

42” – 60”+ = $6.00 per in/ft

long term capital expenditure planning23
Long-term Capital Expenditure Planning

Manholes/ Structures

  • Assumes manholes will be

be rehabilitated with epoxy

coating/lining for cost

estimating purposes

  • Other rehab methods

considered during design

(other coating/liner types,

CAM, fiberglass, HDPE)

  • Cost estimates based on

past MWRD rehab projects

prioritization for pipe manhole rehabilitation projects
Prioritization for Pipe & Manhole Rehabilitation Projects
  • Pipe segments rated “very poor” will be repaired on priority basis (i.e. next available rehab project)
  • Adjoining “poor” segments will be added when shared bypass pumping cost savings can be realized
  • Assumed that only 75% of “poor” and “fair-poor” rated pipes will ever reach “very poor” condition
  • Projected timing for when pipe segment or manhole will deteriorate and reach “poor” or “very poor” is considered
  • Manholes rated as “poor” will be repaired on priority basis (i.e. next available rehab project)
  • 10-year Capital Expenditure Schedule updated accordingly
conclusions
Conclusions
  • A well-run Condition Assessment & Rehabilitation Program provides a systematic, consistent, & cost-effective approach to asset management
  • Supports long term capital expenditure planning
  • Effective in forecasting future maintenance needs, prioritizing resource allocation, and costs based on inspection & condition assessment ratings
  • Reduces potential overflows, violations & failures
  • Utilizes trenchless technology
  • Can save a lot of money!
questions jeff maier p e metro wastewater reclamation district denver colorado 303 286 3285
Questions?Jeff Maier, P.E.Metro Wastewater Reclamation DistrictDenver, Colorado303-286-3285