Sewer System Master Plan
Council PresentationSeptember 14, 2010
Clean Water Services
City - Local Services CWS – Regional Services
City◦ Operates collection
system (pipes up to 24”)◦ Does utility billing◦ Responsible for system
integrity◦ Provides for system
extensions
CWS◦ Provides treatment◦ Owns and operates pipe
over 24 inch and larger ◦ Coordinates CIP◦ Sets maintenance
standards◦ Sets technical standards◦ Sets the sewer service
rates
Clean Water Act Requirements ◦ No overflows due to inadequate capacity
Assess capacity needs Assess areas where rain water intrusion is
high Not covered
◦ System preservation and replacement
Master Plan Scope
The Sewer System
Capacity sites (City responsibility)◦ East Tigard Trunk◦ SW Katherine lateral◦ 128th avenue lateral◦ Shore Drive Trunk
Cost Estimate◦ 1.7 Million
Capacity Findings
CWS Projects◦ 72nd Avenue Lateral◦ Scholl Trunk◦ Metzger Interceptor◦ Elmwood Lateral
Cost Estimate:◦ $ 10.6 million
Capacity Finding CWS
East Tigard Trunk
Shore Drive Project
Rain Water Intrusion Areas
Cost Estimate: $2.0 million City $2.0 million District
Rainwater intrusion
System is aging◦ parts over 60 years old
System length◦ 873,000 feet (165 miles)
Replacement value in 2010 dollars◦ $90 million
Annual investment to replace over 50 years◦ $1.8 million
System Preservation
5 year Cost Estimate SummaryCity investment Est. Cost
in millionsCapacity Improvements $1.7Rainwater Intrusion Rehabilitation 2.0System Preservation 9.0
Total $12.7
Continue operations◦ System preservation analysis
Adopt the plan CWS CIP Process City CIP process Project completion System preservation
Moving forward