HomeMy WebLinkAboutMINUTES - 12092008 - C.105 TO: BOARD OF SUPERVISORS, AS GOVERNING ` -- QOn ra
BOARD OF THE FLOOD CONTROL & WATER '
CONSERVATION DISTRICT
Costa
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FROM: JULIA R. BUEREN, CHIEF ENGINEER County
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DATE: December 9, 2008
SUBJECT: CONTINUE the emergency action originally taken by the Board of Supervisors on April 10, 2007,
regarding the Lower Walnut Creek Interim Protection Measures project, Pacheco area. (Flood Control
Zone 3B Funds) (Districts II & IV) Project No. 7520-6138345
SPECIFIC REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND AND JUSTIFICATION
RECOMMENDED ACTION:
DETERMINE that there is a need to continue 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 estimated contract cost is $8,500,000, funded by Flood Control Zone 3B Funds.
CONTINUED ON ATTACHMENT: I] SIGNATU
RECOMMENDATION OF COUNTY ADMINISTRATOR ECOM NDATIO OF BOARD CO EE
APPROVE OTHER
SIGNATURE(S): fy, ,,, �,,e,p All—,
ACTION OF BOARD ON�C1eAh eI CII �1—(.x/p APPROVED AS RECOMMEND OT/ER
VOTE OF SUPERVISORS: I HEREBY CERTIFY THAT THIS -IS A TRUE AND
CORRECT COPY OF AN ACTION TAKEN AND ENTERED
\/ UNANIMOUS(ABSENT ) ON MINUTES OF THE BOARD OF SUPERVISORS ON
AYES: NOES: THE DATE SHOWN.
ABSENT: ABSTAIN:
Contact: Greg Connaughton(925)313-2271Q—
GC:PD:cw
G:\FldCtl\Board Orders 2005 Onward\2008 BO\Lower Walnut Creek Emergency ATTESTED
BO 12-09-08.doc DAVID TWA,CLERK OF THE 8OARD OF SUPERVISORS
AND COUNTY ADMINISTRATOR
cc: County Administrator
Auditor—Controller
Public Works:
Julia R.Bueren,Chief Engineer BY: C �NW��►�
R.Mitch Avalon,Deputy Chief Engineer DEPUTY
Kevin Emigh,Construction
Greg Connaughton,Flood Control
Paul Detjens,Flood Control
SUBJECT: CONTINUE the emergency action originally taken by the Board of Supervisors on April 10,
2007, regarding the Lower Walnut Creek Interim Protection Measures project, Pacheco area.
(Flood Control Zone 3B Funds) (Districts II & IV) Project No. 7520-6138345
DATE: December 9, 2008
PAGE: 2 of 2
REASONS FOR RECOMMENDATIONS AND BACKGROUND:
A. 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.
B. Repair status:
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 approved both phases of the CAP on May 19, 2008. The second phase of
work included levee reconstruction at selected locations near the confluence of Walnut and Grayson Creeks.
This Phase 2 work was substantially completed in October 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. These follow up tasks are expected to be complete in spring 2009.
CONSEQUENCES OF NEGATIVE ACTION:
Nonconcurrence with the above recommendation may significantly delay implementation of the remaining CAP
work in Lower Walnut Creek flood control facility and prevent the District from meeting the correction
schedule required by the US Army Corps of Engineers.