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TO: BOARD OF SUPERVISORS, AS 'THE GOVERNING BODY OF THE CONTRA COSTA
COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTRICT
FROM: J. MICHAEL WALFORD, CHIEF ENGINEER
DATE: June 2, 1992
SUBJECT: Approve Addendum No. 1 for the West Antioch Creek Interim Flood Control Project
Project No.: 7579-6D8538-91
SPECIFIC REQUEST(S) OR RECOMMENDATIONS) &BACKGROUND AND JUSTIFICATION
I. Recommended Action:
APPROVE prior issuance of Addendum No. 1 for the West Antioch Creek Interim Flood Control
Project.
II. Financial Impact:
The revised estimated contract cost is $1,552,000, funded by Drainage Area 55 (100%).
III. Reasons for Recommendations and Background:
On April 28, 1992 the Board of Supervisors approved plans and specifications for this project.
This addendum is required for the following reasons:
eSome of the quantities shown on the plans, in the Proposal and in the Notice to Contractors
have been revised.
*The special provisions have been modified to require epoxy-coated reinforcing steel across the
construction joints in the concrete channel and wingwalls as recommended by the California
Department of Transportation Materials Lab for concrete construction in a marine environment.
*Pay clauses for filter fabric and for temporary gates were added to the special provisions to
ensure these items of work are adequately covered.
Continued on Attachment: SIGNATURE:
_Av/eaatt��
_ RECOMMENDATION OF COUNTY ADMINISTRATOR
_ RECOMMENDATION OF BOARD COMMITTEE
APPROVE OTHER
SIGNATURE(S):
ACTION OF BOARD ON JUN 2 1992 ' APPROVED AS RECOMMENDED v1 OTHER
VOTE F SUPERVISORS
UNANIMOUS (ABSENT 1
AYES: NOES:
ABSENT: ABSTAIN:
1 hereby certify that this IS a true and correct copy 3f
an action taken and entered on the minutes of the
JRB:DR:jlg Board of Supery rs The date shown.
c\BO:boi.t6 N 1992
ATTESTED: , �.�..
PHIL BATCHELOR,Clerk of the Board
Orig. Div: Public Works (Design Division) of Supervisors and County Administrator
cc: County Admin: E. Kuevor
Auditor-Controller By ��' ' ` tir Deputy
PW Accounting
Construction
Approve Addendum No. 1 for the West Antioch Creek Interim Flood Control Project
June 2, 1992
Page 2
•The special provision for concrete structures was modified to ensure adequate compressive
strength for the concrete channel and wingwalls is required.
eThe Typical Sections and Details sheets of the plans were revised for clarity.
IV. Consequences of Negative Action:
Failure to correct the plans, special provisions, Notice to Contractors and Proposal may cause
confusion to bidders, resulting in higher bid prices.