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