Transcript The City of Powers WaterS

The City of North Bend
Sanitary Sewer System
Wastewater Treatment Plant
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.
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.
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.
North Bend Sewer System
Problems areas identified
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)
Treatment Plant
The treatment plant was constructed in 1954,
upgraded in 1971, 1977, 1991,& 2006. 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.
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.
Biosolids application site on
Weyerhaeser Property
Biosolids Application site.
SLUDGE DREDGE
TO REPLACE IN 2015 - $150,000 TO $200,000
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.
Lift Station # 8 to be upgraded
Lift Station # 7 (Menasha)
Sanitary Sewer Projects
 Pipe lining of an estimated 8600 ft.
 Sewer line replacements on!
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a. Marion
b. Madrona
c. Highway street.
d. Chester St.
e. Pacific Ave.
Broken sewer main (clay)
Sand coming into uncapped
lateral
Root Intrusion after high
pressure cleaning
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.
What’s next? Re-evaluation.
Smoke Testing
Flow Mapping
Capital Improvement Projects
Construction
TV Inspection
Smoke Testing
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
TV Inspection
 TV Trouble areas to determine repair
method to use
Before and After
Lining of Sewers
 Will include additional pipe lining and lateral
replacements
Manhole Maintenance
 The city has 1000
manholes
 They are evaluated and
repaired as needed.
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.
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.
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.
Estimated Replacement Costs.
2003
2011
Treatment Plant -$11.6 15.2 million
Sewer lines $20.2
24.8 million
Lift Stations $1.9
2.6 million
Portable equipment
$0.5
0.9 million
Total replacement
$34.2 $43.5 million
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
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.
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.
Questions
Thank you.