TO: Members of the City Council
FROM: Mayor Angela Birney
DEPARTMENT DIRECTOR CONTACT(S):
Public Works
Aaron Bert
425-556-2786
DEPARTMENT STAFF:
Public Works
Chris Stenger
Deputy Public Works Director
Public Works
Doug DeVries
Utility Manager
TITLE:
title
Approval of Settlement Agreement with King County Regarding Asbestos Cement Pipe Removal Associated with the Lake Hills and Northwest Lake Sammamish Sewer Upgrade Project
OVERVIEW STATEMENT:
recommendation
Public Works requests Council approval for the Mayor to execute a Settlement Agreement with King County regarding the future removal and cost responsibilities related to out-of-service asbestos cement (AC) pipe that will be left in place as part of the Lake Hills and Northwest Lake Sammamish Sewer Upgrade Project.
The project is a critical infrastructure upgrade led by King County to address capacity deficiencies and aging infrastructure in Redmond and Bellevue. The Lake Hills Trunk and NW Lake Sammamish Interceptor include 4.5 miles of gravity sewer and two siphon segments. As of 2010 modeling, the pipelines can only convey flows from a 5- to 10-year storm, with some segments performing even worse. Additionally, inspections in the late 2000s showed the Lake Hills Trunk was in poor condition and should be replaced.
This project will expand capacity to accommodate a 20-year peak storm flow through 2060.
The City's execution of this Agreement will also support timely project permitting; King County anticipates presenting the Conditional Use Permit application for the project to the Redmond Hearing Examiner in August 2025.
body
? Additional Background Information/Description of Proposal Attached
REQUESTED ACTION:
? Receive Information ? Provide Direction ? Approve
REQUEST RATIONALE:
* Relevant Plans/Policies:
? Redmond 2050 Comprehensive Plan Utility Policies:
o UT-10 Coordinate with regional partners to maintain wastewater infrastructure that meets community and environmental needs.
o ...
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