The City of North Bend The City of North Bend Sanitary Sewer System Sanitary Sewer System

Wastewater Treatment PlantWastewater Treatment Plant

Wastewater Rate StudyWastewater Rate Study

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

MethodologyMethodology

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

Numerous projects are planned for the next 5 Numerous projects are planned for the next 5 years.years.

Collection SystemCollection System

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

North Bend Sewer SystemNorth Bend Sewer System

Problems areas identifiedProblems areas identified

Sewer MaintenanceSewer Maintenance

New EPA rules have placed a heavy burden for New EPA rules have placed a heavy burden for minimum requirement for cleaning, t.v. and minimum requirement for cleaning, t.v. and monitoring of system with zero tolerance of monitoring of system with zero tolerance of sewer backups and overflows.sewer backups and overflows.

We make 25 to 30 repairs a year and we bid out We make 25 to 30 repairs a year and we bid out numerous projects that are too large and deep numerous projects that are too large and deep for us to perform. (We can go about 10 ft. deep)for us to perform. (We can go about 10 ft. deep)

Treatment PlantTreatment Plant

The treatment plant was constructed in 1954, The treatment plant was constructed in 1954, upgraded in 1971, 1977, 1991,& 2006. Reasons upgraded in 1971, 1977, 1991,& 2006. Reasons for upgrades include regulation changes and for upgrades include regulation changes and age of equipment.age of equipment.Current needs and requirements include.Current needs and requirements include.1. Change the way we disinfect the plant effluent1. Change the way we disinfect the plant effluent2. Increased testing and monitoring cost’s.2. Increased testing and monitoring cost’s.3. Upgrade biosolids program.3. Upgrade biosolids program.4. Upgrade of process control equipment.4. Upgrade of process control equipment.

Additional projects plannedAdditional projects planned

Changing from chlorine to sodium Changing from chlorine to sodium hyprochlorite (safety) or alternative new hyprochlorite (safety) or alternative new technologytechnology

Reduce energy cost’s with more efficient Reduce energy cost’s with more efficient equipment. We continue to work on this.equipment. We continue to work on this.

Upgrade Process Control equipment.Upgrade Process Control equipment.

Evaluate purchasing equipment to line Evaluate purchasing equipment to line sewers vs. contracting out.sewers vs. contracting out.

Biosolids application site on Biosolids application site on Weyerhaeser PropertyWeyerhaeser Property

Biosolids Application site.Biosolids Application site.

SLUDGE DREDGESLUDGE DREDGETO REPLACE IN 2015 - $150,000 TO $200,000TO REPLACE IN 2015 - $150,000 TO $200,000

Lift StationsLift Stations

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

Lift Station # 8 to be upgradedLift Station # 8 to be upgraded

Lift Station # 7 (Menasha)Lift Station # 7 (Menasha)

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

Sanitary Sewer ProjectsSanitary Sewer Projects

Broken sewer main (clay)Broken sewer main (clay)

Sand coming into uncapped Sand coming into uncapped laterallateral

Root Intrusion after high Root Intrusion after high pressure cleaningpressure cleaning

Misc. Work that needs to be included in routine Misc. Work that needs to be included in routine operations but limited to time restraints.operations but limited to time restraints.

Inspect commercial users on a routine basis.Inspect commercial users on a routine basis. Smoke test for broken house lateralsSmoke test for broken house laterals Monitor flows in sewer system during high flow Monitor flows in sewer system during high flow

events.events. Training on computers and computer software.Training on computers and computer software. Painting of structures and equipment.Painting of structures and equipment.

What’s next? Re-evaluation.What’s next? Re-evaluation.

Flow MappingSmoke Testing

TV Inspection

Capital Improvement Projects

Construction

Smoke TestingSmoke Testing

Flow MappingFlow Mapping

To be performed this winter. To be performed this winter. Utilize “Flow Poke” Utilize “Flow Poke”

instrumentationinstrumentation Able to isolate I/I flows Able to isolate I/I flows

between two manholesbetween two manholes Locate trouble for further Locate trouble for further

investigation investigation

TV InspectionTV Inspection

TV Trouble areas to determine repair TV Trouble areas to determine repair method to usemethod to use

Before and AfterBefore and After

Lining of SewersLining of Sewers

Will include additional pipe lining and lateral Will include additional pipe lining and lateral replacementsreplacements

Manhole MaintenanceManhole Maintenance

The city has 1000 The city has 1000 manholesmanholes

They are evaluated and They are evaluated and repaired as needed.repaired as needed.

Format for Rate ProposalFormat for Rate Proposal

Three forms of calculating sewer rates Three forms of calculating sewer rates were used. were used.

1. Flat rate for all customers.1. Flat rate for all customers. 2. Flow based rate for all customers2. Flow based rate for all customers 3. Combination flat and flow based 3. Combination flat and flow based rates.rates. Flat rate for residential customers and Flat rate for residential customers and

flow based for commercial users was flow based for commercial users was selected.selected.

Reasons for Proposed Reasons for Proposed rate type (Combination Rate)rate type (Combination Rate)

Flat residential rate creates stable revenue Flat residential rate creates stable revenue source and commercial flow based rates catches source and commercial flow based rates catches high flow users that add higher loadings to the high flow users that add higher loadings to the treatment plant.treatment plant.

This type of billing is the existing format we have This type of billing is the existing format we have and is easy to manage.and is easy to manage.

High percentage of cost are fixed cost’s that are High percentage of cost are fixed cost’s that are not dependent on change of flows.not dependent on change of flows.

Additional Area’s of StudyAdditional Area’s of Study

Funding depreciation.Funding depreciation.

Sewer Hookup charges.Sewer Hookup charges.

Cost of living increases vs. past rate Cost of living increases vs. past rate increases.increases.

Billing for high strength/high inflow users.Billing for high strength/high inflow users.

Estimated Replacement Costs.Estimated Replacement Costs.

2003 20112003 2011

Treatment Plant -- $11.6 15.2 million Treatment Plant -- $11.6 15.2 million

Sewer lines - $20.2 24.8 millionSewer lines - $20.2 24.8 million

Lift Stations - $1.9 2.6 millionLift Stations - $1.9 2.6 million

Portable equipment $0.5 0.9 millionPortable equipment $0.5 0.9 million

Total replacement Total replacement $34.2 $43.5 million$34.2 $43.5 million

Depreciation FundingDepreciation Funding(example)(example)

Treatment Facility – 30 years - $387,000 Treatment Facility – 30 years - $387,000 annuallyannuallySewer piping – 60 years life – $337,000 Sewer piping – 60 years life – $337,000 annually.annually.Lift Stations – 35 years life - $54,000 annuallyLift Stations – 35 years life - $54,000 annuallyPortable Equipment – 10 years life. Portable Equipment – 10 years life. $60,000/year.$60,000/year.Total = $838,000Total = $838,000

GoalsGoals

Create stable funding.Create stable funding.

Build capital replace fund to 10% of value Build capital replace fund to 10% of value of system $4.3 million.of system $4.3 million.

Catch up on projects Catch up on projects

Meet new demands set forth by DEQ, Meet new demands set forth by DEQ, EPA, OSHA and the environment.EPA, OSHA and the environment.

Proposed Rate Proposed Rate

Residential $30.00 flat rate.Residential $30.00 flat rate.

Commercial $30.00 flat rate + $2.13/100 Commercial $30.00 flat rate + $2.13/100 cubic ft. in excess of 800 cu.ft. cubic ft. in excess of 800 cu.ft.

Hookup charges not to be changed at this Hookup charges not to be changed at this time.time.

High Strength/High inflow charge to be set High Strength/High inflow charge to be set by Director of Public Works.by Director of Public Works.

QuestionsQuestions

Thank you.