HomeMy WebLinkAboutSR - C22870B - CO6 - Portola BridgeREQUEST:
SUBMITTED BY:
CONTRACTOR:
DATE:
CONTENTS:
Recommendation:
CITY OF PALM DESERT
PUBLIC WORKS DEPARTMENT
STAFF REPORT
Approve Construction Change Order No. 6 to Contract No.
C22870B with Granite Construction Company for the
Construction of the Whitewater Bridge at Portola Avenue
(Project Number 647-04)
Mark Greenwood, P.E.
Director of Public Works
Granite Construction Company
38000 Monroe Street
Indio, California 92203-9500
June 14, 2007
Construction Change Order No. 6
Status of Construction Change Orders
Vicinity Map
By minute motion, approve:
1. Construction Change Order No. 6 to Contract C22870B with
Granite Construction Company for additional and deletion of
work in an amount not to exceed $391,879.00 required for the
construction of the Whitewater Bridge at Portola Avenue;
2. The transfer of $391,879.00 from contingency to base for this
construction change order.
Discussion:
On July 14, 2005, City Council approved Contract No. C22870B with Granite
Construction Company in the amount of $10,046,046.00, plus a 10% contingency,
for construction of the Whitewater Bridge at Portola Avenue. The Notice to Proceed
with construction was issued on August 22, 2005. Construction is progressing well
and the west side of the bridge is scheduled to be open to traffic by July 31, 2007.
Staff requests approval of Construction Change Order No. 6 that includes the
following items that are shown on attached revised Plan Sheets C-5 and BR-1 and
Specifications:
• Add a concrete channel invert slab under the bridge.
• Delete rock scour protection at pier footings.
• Modify the concrete slope protection (channel lining).
Construction Change Order No. 6 to Contract C22870B-Granite Construction
Page 1 of 2
June 14, 2007
During bidding of this project, CVWD and their engineers, Bechtel, raised concerns
with the possibility of scouring during storm events that could undermine and cause
severe damage to the pier footings and the channel lining. An addendum was
issued during bidding that added a rock scour protection apron around the pier
footings and a toe structure at the bottom of the concrete channel slope lining. After
bids were received and prior to issuing an encroachment permit, CVWD and
Bechtel, because of the potential for scour, would only accept the construction of a
concrete channel invert slab. Because of the risk posed by the potential scour and
to not delay the issuance of the CVWD permit and beginning of construction, City
Public Works staff agreed to implement this change. In addition, scouring occurred
during storm events at the Whitewater Channel at Monterey Avenue and Public
Works had to later construct an invert slab at that location.
Attached is the Status of Construction Change Orders that lists the five change
orders that were previously approved by City Council and this change. Staff also
requests approval to move $391,879.00 from contingency to base for this
construction change order. Upon approval of this transfer, funds will be available in
the project account no. 400-4359-433-4001. The Coachella Valley Association of
Governments (CVAG) will be contributing 50% of the project costs, including this
change order.
Submitted By:
John/A. Garcia P.E.
Engineering Manager
Approval:
Homer Croy
ACM for Dev
Carlos Orteg
City Manager
JG:dhl
ment Services
Depart /ead:
Mark Greenwood, P.E.
Director of Public Works
aul Gibson
Finance Director
1ITY COUNCIL FACTION:
APPROVED ✓ DENIED
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