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TO: BOARD OF SUPERVISORS, AS THE GOVERNING BOARD OF CONTRA COSTA
COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTRICT
FROM: J. MICHAEL WALFORD, CHIEF ENGINEER
DATE: December 7, 1993.
SUBJECT: CONTRACT INCREASE WITH ENGEO INCORPORATED FOR SEDIMENT SAMPLING
AND TESTING OF THE LOWER WALNUT CREEK CHANNEL, AVON AREA
Project No.: 7520-668430
SPECIFIC REQUEST(S) OR RECOMMENDATIONS) &BACKGROUND AND JUSTIFICATION
I. Recommended Action:
APPROVE an increase to the Consulting Services Agreement with Engeo Incorporated for the
biological resources study. The study was done for the Lower Walnut Creek Channel with an
expenditure of $13,265, for a new payment limit of $70,520.
II. Financial Impact:
The cost will be funded by Flood Control Zone 3B.
Ill. Reasons for Recommendations and Background:
The consultant's contract was to determine the Walnut Creek Channel sediment composition and
to determine the presence of pollutants which may restrict the ability to dispose the sediment
excavated from the channel. There are significant environmental and regulatory agency
requirements affecting such removal and disposal for the silt. Wetlands, vegetation, and wildlife
would also be sensitively impacted. The consultant has done a biological resources survey for
this portion of the channel. As part of compliance with environmental and regulatory agency
requirements, the study is a necessary process to be included in the consultants contract.
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 include the.biological resources study in this contract would
delay the design phase of the project. This delay may result in flooding which would be in
violation of the Operations and Maintenance Agreement with the Corps of Engineers.
Continued on Attachment: SIGNATURE:
RECOMMENDATION OF COUNTY ADMINISTRATOR
RECOMMENDATION OF BOARD COMMITTEE
APPROVE OTHER
SIGNATURE(S):
ACTION OF BOARD ON DEC 7 1993 APPROVED AS RECOMMENDED V OTHER _
VOTE OF SUPERVISORS
✓ UNANIMOUS (ABSENT
AYES: NOES:
ABSENT: ABSTAIN:
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c:\BO\Engeo 7.t12
Orig. Div: Public Works (F/C)
Contact: M. Morton, Flood Control, 313-2285 j
cc: Building Inspection I hereby certify that this Is a true NO correct COPY O
Community Development an action taken and entered on the minutes of the
County Administrator Board of Supervisors on the date shown.
County Assessor ATTESTED: DEC 7 199 .���.
County Auditor - Controller PHIL BAT&ELOR,clerk or the Board
County Counsel of Supervisors and County Administrator
County Treasurer-Tax Collector f
Accounting
Chief Engineer
Engineering Services
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