Agenda

Return

C.7

To:
From:	Julia R. Bueren, Public Works Director/Chief Engineer
Date:	February 3, 2009

Contra

Costa

County

Subject:

TERMINATE the emergency action from April 10, 2007, regarding the Lower Walnut Creek Interim Protection Measures Project. Proj #7520-6B8345

APPROVE	OTHER
RECOMMENDATION OF CNTY ADMINISTRATOR	RECOMMENDATION OF BOARD COMMITTEE

Action of Board On: 02/03/2009

APPROVED AS RECOMMENDED

OTHER

Clerks Notes:

VOTE OF SUPERVISORS

AYE:

John Gioia, District I Supervisor
Gayle B. Uilkema, District II Supervisor
Mary N. Piepho, District III Supervisor
Susan A. Bonilla, District IV Supervisor
Federal D. Glover, District V Supervisor

Contact:

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: February 3, 2009
,

BY:	, Deputy

RECOMMENDATION(S):

TERMINATE the emergency action taken by the Board of Supervisors on April 10, 2007, pursuant to Public Contract Code Sections 22035 and 22050, to implement the Lower Walnut Creek Interim Protection Measures project, Pacheco area.

FISCAL IMPACT:

The total project cost was $4,612,000 funded by Flood Control Zone 3B Funds.

BACKGROUND:

On April 10, 2007, the Board of Supervisors declared an emergency and authorized the Chief Engineer to proceed in the most expeditious manner to repair or replace the Lower Walnut Creek flood control facility as directed by the US Army Corps of Engineers.

BACKGROUND: (CONT'D)

The Contra Costa County Flood Control and Water Conservation District (District) prepared the Lower Walnut Creek Corrective Action Plan (CAP) and presented it to the US Army Corps of Engineers for consideration on June 11, 2007. The CAP contained two phases of work. The first phase of the project included significant sediment removal and levee reconstruction and was completed in early December 2007.

The US Army Corps of Engineers (Corps) approved both phases of the CAP on May 19, 2008. The second phase of CAP work included levee reconstruction at selected locations near the confluence of Walnut and Grayson Creeks. This Phase 2 CAP work was substantially completed in October 2008. The Corps determined the Lower Walnut Creek flood control facility to be in minimally acceptable condition upon their inspection on December 10, 2008. The remaining tasks are focused on mitigating the impacts of both phases of work. Specifically, this includes adjusting topography in reconstructed marsh areas to reduce mosquito habitat and revegetating and monitoring areas disturbed by both phases of work. Continuation of the emergency action would have facilitated grading of sensitive tidally influenced areas to promote drainage and the consequent reduction in mosquito habitat. Ongoing monitoring indicates that normal tidal action will reestablish a natural drainage pattern without further intervention. Therefore, the continuation of the emergency action is no longer necessary.

CONSEQUENCE OF NEGATIVE ACTION:

Without official termination of the emergency action, a state of emergency will technically continue to exist in the Lower Walnut Creek flood control facility.