Successfully Developing & Managing Wastewater Pipeline/ Manhole Condition Assessment & Rehabilitation Programs P

1. 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

2. 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

3. 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

4. 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!

5. 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

6. 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)

7. 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.

8. 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

9. 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

10. 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

11. 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.

12. 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

13. 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

14. 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.

15. Program Components: Manhole/ Structure Inspection Manhole surface & entry inspection examples:

16. 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)

17. Program Components: GIS Mapping Example GIS Map & Legend

18. 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

19. 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

20. 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%)

21. 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

22. 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

23. 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

24. 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

25. 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!

26. Questions?Jeff Maier, P.E.Metro Wastewater Reclamation DistrictDenver, Colorado303-286-3285