Council authorizes $1.1M design contract for Homestead-Walker stormwater detention vault
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Summary
The city authorized a master consulting agreement for engineering design services totaling $1,100,000 for an underground stormwater detention vault at 900 Homestead Avenue to address recurrent flooding; construction is projected for 2028 with landscaping and sidewalk improvements above the vault.
The Walnut Creek City Council on Dec. 16 authorized the city manager to execute a consulting services agreement for engineering design of a stormwater detention vault at the Homestead and Walker Avenue intersection.
Alex Wong, senior engineer with the capital improvement program, told the council that uncontrolled stormwater runoff from the Okno Loop area overwhelms the existing drain system and has caused flooding on adjacent properties. Staff's recommended solution is an underground retention vault at 900 Homestead Avenue sized to store runoff from a 10-year storm, with an internal pump system that meters release to the downstream storm network.
Wong described surface improvements that would accompany the vault: a maintenance access area, landscaping configured as green infrastructure to treat runoff, and a sidewalk along Walker and Homestead frontages. He said final design and construction documents were the focus of the current procurement and estimated construction scheduling that could place work in 2028 due to necessary surveys, utility coordination and geotechnical studies.
Council moved to authorize the city manager to enter a master consulting agreement for design services in the amount of $1,100,000 and to transfer nearly $500,000 in remaining budget funds; the motion passed by roll call. Staff said the agreement funds the final design phase and preparation of construction documents but not the construction contract itself.
