HomeMy WebLinkAbout05.a. Receive update on future joint project with City of Walnut Creek (Walnut Boulevard, Walker Avenue, and Homestead Avenue Drainage Improvement Project)Page 1 of 4
Item 5.a.
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November 9, 2021
TO: ENGINEERING AND OPERATIONS COMMITTEE
FROM: DAMASIO ZEPEDAARAGON, ASSOCIATE ENGINEER
REVIEWED BY: SASHA MESTETSKY, SENIOR ENGINEER
EDGAR J. LOPEZ, CAPITAL PROJECTS DIVISION MANAGER
JEAN-MARC PETIT, DIRECTOR OF ENGINEERING AND TECHNICAL
SERVICES
ROGER S. BAILEY, GENERAL MANAGER
SUBJECT: RECEIVE UPDATE ON FUTURE JOINT PROJECT WITH CITYOF WALNUT
CREEK (WALNUT BOULEVARD, WALKER AVENUE, AND HOMESTEAD
AVENUE DRAINAGE IMPROVEMENT PROJECT)
Attached is a presentation on the Walnut Boulevard, Walker Avenue, and Homestead Avenue Drainage
Improvement Project update.
Strategic Plan Tie -In
GOAL ONE: Customer and Community
Strategy 1— Deliver high -quality customer service, Strategy 2 — Maintain a positive reputation
GOAL FIVE: Infrastructure Reliability
Strategy 1— Manage assets optimally to prolong their useful life, Strategy 2 — Execute long-term capital renewal and
replacement program
ATTACHMENTS:
1. Presentation
November 9, 2021 EOPS Regular Committee Meeting Agenda Packet - Page 24 of 29
Page 2 of 4
City of Walnut Creek Drainage
Improvement Project — Central
San Coordination and Impacts
Engineering & Operations Committee Meeting
November 9, 2021
r Edgar J. Lopez, P.E.
. Capital Projects Division Manager
CITY OF WALNUT CREEK DRAINAGE
IMPROVEMENT PROJECT
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• City of Walnut Creek (City) needs
to address storm water concerns in
the Walnut Heights area.
• Scope includes installation of
approximately 2,600 feet of 54-60" wv a.
storm drains by open trench Sara
between Walker Avenue and into
Walnut Boulevard.
• New 60" storm drain will connect to a a
existing 96" storm drain that drains a`
into the Walnut Creek channel. f
• Difficult construction, narrow
residential roads, and nearby w.w
schools. h W"
1
November 9, 2021 EOPS Regular Committee Meeting Agenda Packet - Page 25 of 29
Page 3 of 4
CITY DESIGN CONSIDERATIONS
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Challenges include:
• Existing utilities (PG&E, East Bay Municipal Utility District,
Central San, etc.);
• Location for the new large diameter pipeline and structures;
• Narrow road with existing drainage channel and ditches; and
• Fixed gravity tie-in elevations.
IMPACTS TO CENTRAL SAN
— -�- • Several conflicts exist between
public sewers and private side
' sewers.
,..'a
Photo taken looking north along Walnut Boulevard
at Sierra Lane intersection
c • Heavy construction may
compromise the existing parallel
12" vitrified clay pipe sewer
installed in 1950s.
• A portion of the City work is
within an area which Central
San renovated 1,100 feet of
sewers in 2010.
• The project may require the
relocation/replacement of
existing sewers or new sewers
along the proposed storm drain
alignment.
2
November 9, 2021 EOPS Regular Committee Meeting Agenda Packet - Page 26 of 29
Page 4 of 4
CENTRAL SAN - CITY COORDINATION
Example of large diameter pipeline work in 2004 in Pleasant Hill,
36" interceptor by open trench
• Staff is working with the City and
consultant (Harrison Engineering,
Inc.) to find technical and
economical solutions.
• Staff is providing record drawings,
survey elevations, and other
relevant information.
• City project schedule to be
determined.
• Coordination includes permit
processes, public notifications,
and sewer construction standards.
• Staff is evaluating the remaining
life of the sewers and a possible
Joint Powers Agreement with the
City.
QUESTIONS?
November 9, 2021 EOPS Regular Committee Meeting Agenda Packet - Page 27 of 29