Agenda

Return

C. 5

To:	Board of Supervisors
From:	Brian M. Balbas, Public Works Director/Chief Engineer
Date:	March 31, 2020

Contra

Costa

County

Subject:

APPROVE the Happy Valley Road at Bear Creek Road Embankment Repair Project and take related actions under CEQA.

APPROVE	OTHER
RECOMMENDATION OF CNTY ADMINISTRATOR	RECOMMENDATION OF BOARD COMMITTEE

Action of Board On: 03/31/2020

APPROVED AS RECOMMENDED

OTHER

Clerks Notes:

VOTE OF SUPERVISORS

AYE:

John Gioia, District I Supervisor
Candace Andersen, District II Supervisor
Diane Burgis, District III Supervisor
Karen Mitchoff, District IV Supervisor
Federal D. Glover, District V Supervisor

Contact:	Sandeep Singh (925) 313-2022
cc:	Sandeep Singh

I hereby certify that this is a true and correct copy of an action taken and entered on the minutes of the Board of Supervisors on the date shown.
ATTESTED: March 31, 2020
David Twa,

BY:	, Deputy

RECOMMENDATION(S):

APPROVE the Happy Valley Road at Bear Creek Road Embankment Repair Project (Project) and AUTHORIZE the Public Works Director, or designee, to advertise the Project, Lafayette area. [County Project No.0672-6U6215/Federal Project No. ER 32L0(550), DCD-CP#18-05] (District II)


DETERMINE the Project is a California Environmental Quality Act (CEQA), Class 1(c) Categorical Exemption, pursuant to Article 19, Section 15301 of the CEQA Guidelines, and

RECOMMENDATION(S): (CONT'D)

DIRECT the Director of Department of Conservation and Development to file a Notice of Exemption with the County Clerk, and

AUTHORIZE the Public Works Director, or designee, to arrange for payment of a $25 fee to the Department of Conservation and Development for processing, and a $50 fee to the County Clerk for filing the Notice of Exemption.

FISCAL IMPACT:

Estimated Project cost: $550,000. 88.53% Emergency Relief Funds (FHWA), 11.47% Local Road Funds.

BACKGROUND:

The purpose of this Project is to reconstruct the road embankment at Happy Valley Road. The northbound direction of Happy Valley Road eroded during the 2017 winter storms and has been closed off with concrete k-rails. Two trench plates are placed over the remaining road section to support traffic through the slide area. Traffic has been reduced from a two-way road to a single lane road with stop signs installed on both sides of the slide. Repair of the embankment is necessary to prevent further deterioration of the roadway section and to restore the northbound lane to its original state.

The Project will reconstruct the northbound lane and restore two-way traffic to this portion of the Happy Valley Road. The Project will require installing an approximately 45-foot long soldier pile retaining wall on the east side of the roadway near the limit of the County’s right-of-way to support the reconstructed roadway. The piles for the retaining wall will be set via drilling; no pile driving will occur. The anticipated excavation depth is 47 feet for the piles and approximately 8 feet at the base of the retaining wall where precast concrete laggings will be installed. Two new drainage inlets and a new culvert pipe connecting the inlets will be installed underneath an existing driveway on the west side of the road where slide occurred. During construction, there will likely be a 40-day full road closure at the Project site that will create an approximately 11.5-mile detour with a 20-minute delay around the Project site. Equipment staging will occur on East Bay Municipal Utility District parcel located on the west side of the road, across from the slide area. Temporary construction easement will be required. Some vegetation removal including trimming of the existing tree canopy above the proposed retaining wall will be required; any roots exposed during construction activities will be clean cut. Roadway surface drainage patterns will be restored to previous conditions. Construction is currently anticipated to occur in the summer of 2021 and take approximately 45 days to complete.

CONSEQUENCE OF NEGATIVE ACTION:

Delay in approving the Project will result in a delay of design, construction, and jeopardize FHWA Emergency Relief funding.