1. The City of North Bend Sanitary Sewer System

2. Wastewater Treatment Plant

3. Wastewater Rate Study
The purpose of the report is to establish wastewater user rates based on the annual revenue requirements to operate, maintain, and replace existing equipment for the treatment plant and collection system.

4. Methodology
The study uses historical data along with EPA software to help estimate the requirements needed to meet the expected cost’s over the next 5 years. (performed in 2011)
Numerous projects are planned for the next 5 years.

5. Collection System
We have approximately 250,000 ft. of sewer line. The sewer lines are constructed of Clay, Concrete, and PVC. 32,500 ft. of pipe is older than 70 years old with portions as old as 90. Concrete pipe installed in the 1950’s are already failing. Current preventative maintenance includes t.v. of 25,000 ft./yr. Cleaning 70,000 ft./yr.

6. North Bend Sewer System
Problems areas identified

7. Sewer Maintenance
New EPA rules have placed a heavy burden for minimum requirement for cleaning, t.v. and monitoring of system with zero tolerance of sewer backups and overflows.
We make 25 to 30 repairs a year and we bid out numerous projects that are too large and deep for us to perform. (We can go about 10 ft. deep)

8. Treatment Plant
The treatment plant was constructed in 1954, upgraded in 1971, 1977, 1991,& Reasons for upgrades include regulation changes and age of equipment.
Current needs and requirements include.
1. Change the way we disinfect the plant effluent
2. Increased testing and monitoring cost’s.
3. Upgrade biosolids program.
4. Upgrade of process control equipment.

9. Additional projects planned
Changing from chlorine to sodium hyprochlorite (safety) or alternative new technology
Reduce energy cost’s with more efficient equipment. We continue to work on this.
Upgrade Process Control equipment.
Evaluate purchasing equipment to line sewers vs. contracting out.

10. Biosolids application site on Weyerhaeser Property

11. Biosolids Application site.

12. SLUDGE DREDGE
TO REPLACE IN $150,000 TO $200,000

13. Lift Stations
We have 10 pumping station that range in construction from 1954 to 2006 with upgrades made to some of them.
There are planned upgrades to lift stations # 4 (60 years old) & # 8 (40+ years old)
Upgrades are planned for lift stations 5, & 7 in the next 5 years.

14. Lift Station # 8 to be upgraded

15. Lift Station # 7 (Menasha)

16. Sanitary Sewer Projects
Pipe lining of an estimated 8600 ft.
Sewer line replacements on!
a. Marion
b. Madrona
c. Highway street.
d. Chester St.
e. Pacific Ave.

17. Broken sewer main (clay)

18. Sand coming into uncapped lateral

19. Root Intrusion after high pressure cleaning

20. Misc. Work that needs to be included in routine operations but limited to time restraints.
Inspect commercial users on a routine basis.
Smoke test for broken house laterals
Monitor flows in sewer system during high flow events.
Training on computers and computer software.
Painting of structures and equipment.

21. What’s next? Re-evaluation.
Smoke Testing
Flow Mapping
Capital Improvement Projects
TV Inspection
Construction

22. Smoke Testing

23. Flow Mapping To be performed this winter.
Utilize “Flow Poke” instrumentation
Able to isolate I/I flows between two manholes
Locate trouble for further investigation

24. TV Inspection
TV Trouble areas to determine repair method to use

25. Before and After

26. Lining of Sewers
Will include additional pipe lining and lateral replacements

27. Manhole Maintenance The city has 1000 manholes
They are evaluated and repaired as needed.

28. Format for Rate Proposal
Three forms of calculating sewer rates were used.
1. Flat rate for all customers.
2. Flow based rate for all customers
3. Combination flat and flow based
rates.
Flat rate for residential customers and flow based for commercial users was selected.

29. Reasons for Proposed rate type (Combination Rate)
Flat residential rate creates stable revenue source and commercial flow based rates catches high flow users that add higher loadings to the treatment plant.
This type of billing is the existing format we have and is easy to manage.
High percentage of cost are fixed cost’s that are not dependent on change of flows.

30. Additional Area’s of Study
Funding depreciation.
Sewer Hookup charges.
Cost of living increases vs. past rate increases.
Billing for high strength/high inflow users.

31. Estimated Replacement Costs.
Treatment Plant $ million
Sewer lines $ million
Lift Stations $ million
Portable equipment $ million
Total replacement $ $43.5 million

32. Depreciation Funding (example)
Treatment Facility – 30 years - $387,000 annually
Sewer piping – 60 years life – $337,000 annually.
Lift Stations – 35 years life - $54,000 annually
Portable Equipment – 10 years life. $60,000/year.
Total = $838,000

33. Goals Create stable funding.
Build capital replace fund to 10% of value of system $4.3 million.
Catch up on projects
Meet new demands set forth by DEQ, EPA, OSHA and the environment.

34. Proposed Rate Residential $30.00 flat rate.
Commercial $30.00 flat rate + $2.13/100 cubic ft. in excess of 800 cu.ft.
Hookup charges not to be changed at this time.
High Strength/High inflow charge to be set by Director of Public Works.

35. Questions
Thank you .