HomeMy WebLinkAboutMINUTES - 01211997 - C8 TO: BOARD OF SUPERVISORS, AS GOVERNING BOARD OF CONTRA COSTA COUNTY AND
CONTRA COSTA COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTRICT
FROM: J. MICHAEL WALFORD, CHIEF ENGINEER
DATE: January 21, 1997
SUBJECT: APPROVE and AUTHORIZE the Chief Engineer, or designee to execute a Consulting Services
Agreement with Levine-Fricke-Recon in the amount not to exceed $680,000 for the Lower Walnut
Creek Channel Silt Removal Project, Avon Area. Pro. No. 7520-6B-9399
SPECIFIC REQUEST(S)OR RECOMMENDATION(S)&BACKGROUND AND JUSTIFICATION
I. Recommended Action:
APPROVE and AUTHORIZE the Chief Engineer to execute a Consulting Services Agreement with Levine-
Fricke-Recon in the amount not to exceed $680,000 for the Lower Walnut Creek Channel Silt Removal
Project, Avon Area.
H. Financial Impact:
There will be no impact to the General Fund. The Project will be funded from Flood Control District's Zone
3B.
M. Reasons for Recommendations and Background:
The Walnut Creek Channel Improvement Project was authorized by the Flood Control District Act of 1960,
Public Law 86-645, July 14, 1960, and the Eighty-Sixth Congress, H.R. 7634. The authorization plan
consisted primarily of essential channel rectification and enlargement along with levee enhancements from
Rudgear Road on San Ramon Creek to the mouth of Walnut Creek in Suisun Bay. As part of the
authorization document, the Contra Costa County Flood Control and Water Conservation District was the
agency designated to provide required assurances of local cooperation. One specific assurance was that the
Flood Control District would accept the Walnut Creek Channel Improvement Project after its completion
and would ensure maintenance and operation of the completed facilities in accordance with Federal
regulations. The maintenance of the channel will include adequate measures to prevent impairment of the
design capacity of the floodway by removal of silt deposition and regrowth of vegetation. The Corps of
Engineers and the District already completed one desilting project back in 1973.
Continued on Attachment: SIGNATURE: Lo�,- eA,4,.Z
a
_RECOMMENDATION OF COUNTY ADMINISTRATOR
_RECOMMENDATION OF BOARD COMMITTEE
APPROVE OTHER
SIGNATURE(S):
ACTION OF BOARD ON� )199 7 APPROVED AS RECOMMENDED / OTHER_
VOTE OF SUPERVISORS
UNANIMOUS(ABSENT ) o0py
AYES: NOES: ae a°by ctiontaen and entered o�n the minufp of Us
ABSENT: ABSTAIN: B004 of Supervlsow on the date shown.09 AL^A�1 It 7
MC:cI PMI TCMELOR.CI of the b
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Orig.Div: Public Works O
Contact: Mike Carlson 313-2311 0-, Dspft
c: County Auditor-Controller
County Counsel
R.Gilchrist,Accounting
V.Germany,Design
B.Agnew,Flood Control
D.Lipton,Levine-Fricke-Recon
Consulting Services Agreement
Levine-Fricke-Recon
January 21, 1997
Page 2
M. Reasons for Recommendations and Background Cont.
Recent surveys of the Walnut Creek project have revealed that the lower reaches of the project have
accumulated approximately 800,000 cubic yards of silt that is severely impacting the design capacity of the
channel. The Army Corps of Engineers has requested that the Flood Control District restore the channel back
to its original capacity in accordance with Federal regulations.
District staff recommends that we execute a Consulting Service Agreement with Levine-Fricke-Recon to
begin processing the initial phases of the silt removal project. Levine-Fricke-Recon's primary role during
these initial phases will be to address significant and regulatory agency requirements affecting such removal
and disposal of the silt material. Later phases will include project development including project alternatives
to select the most cost effective method for silt removal, preparation of environmental permits and
applications and preparation of the final engineering plans and specifications. Each later phase will be
authorized by the Chief Engineer on an as needed basis and may result in a reduction in the scope of work
and also a reduction in the overall contract amount.
IV. Consequences of Negative Action:
The Flood Control District has been directed by the Department of the United States Army Corps of
Engineers to arrange for the removal of the sediment to restore the design capacity of the Walnut Creek
Channel. Failure to preform the removal of the sediment would result in localized flooding of the area during
a major storm event and be in violation of Federal regulations and the Operations and Maintenance
Agreement with the Corps of Engineers.