HomeMy WebLinkAbout09 - Buck Gully Wetlands Maintenance Road RepairsCITY OF NEWPORT BEACH
CITY COUNCIL STAFF REPORT
Agenda Item No. 9
February 12, 2008
TO: HONORABLE MAYOR AND MEMBERS OF THE CITY - COUNCIL
FROM: Public Works Department
Steve Luy
949 -644 -3330 or sluy @city.newport- beach.ca.us
SUBJECT: BUCK GULLY WETLANDS AND MAINTENANCE ROAD REPAIRS AT
5T" STREET - CONTRACT NO. 3778 — AUTHORIZE AN INCREASE IN
CONTRACT CONTINGENCY
RECOMMENDATIONS:
1. Increase the project contingency from an amount of $34,500 to $86,000 to cover
unanticipated additional costs for this project.
2. Approve a budget amendment transferring $25,000 of cost savings from the
Citywide Street and Storm Drain Improvements Project (General Fund Account
No. 7013- C5100019) and $26,500 from Bay Avenue Drainage Project (General
Fund Account No. 7012- C5100829) to the Buck Gully Wetlands and
Maintenance Road Repairs Project (Account No. 7014- C5100659).
DISCUSSION:
On July 24, 2007, City Council awarded the Buck Gully Wetlands and Maintenance
Road Repairs at 5�h Street Project to McKenna General Engineering, Inc, at a contract
price of $344,823.60 and approved a contingency of $34,500. Due to several
unforeseen conditions as well as weather related damage during construction, the final
cost for this project is expected to exceed the previously authorized contingency.
This project entails the reconstruction of the maintenance road crossing Buck Gully
Creek that is utilized by the City's Utilities Department to access water main facilities.
This project also includes a design feature to stabilize the streambed which has
experienced down- cutting that could threaten to undermine the new creek crossing or
possibly destabilize the canyon banks. As concrete -lined channels are no longer the
preferred alternative by the jurisdictional agencies, stabilization of the streambed is
being accomplished using different types of gabions (wire baskets filled with rock or soil)
that are then tied together forming a continuous structural element. This
environmentally - friendly building method has been viewed more favorably by the
permitting agencies since the City's successful Morning Canyon stabilization project.
Buck Gully Wetlands and Maintenance Road Repairs — Contract No. 3778
Authorize an Increase in Contract Contingency
February 12, 2008
Page: 2
Several unforeseen conditions during construction have now increased the costs for this
project higher than anticipated. While a portion of the cost increase can be attributed to
the unusual nature and unknowns associated with the project design, the greatest
difficulty and related cost increases are associated with having to construct
improvements within the streambed during the rainy season. The breeding season for
the gnat catcher and other protected species dictated that construction could not
commence until late August. While this was supposed to be another El Nino year, we
have now experienced a series of rain storms that have not only delayed construction
activities, but have impacted or damaged formwork or construction elements that were
in the process of being completed. The silver lining is that we have had frequent 'water -
tests' of this innovative design and so have had an opportunity to identify and correct
design weaknesses by installing 96 additional gabions. The total construction cost for
this project based on weather, runoff damage and additional necessary gabions is now
projected to be $431,000 which will be approximately 25% higher than the contract
award of $344,823.60.
The road repair and streambed stabilization tasks are expected to be completed by the
end of January. The :irrigation and planting of native California wetland and upland plant
species are expected to be completed by the end of February, at which time the 120 -
day plant establishment maintenance period would commence.
Funding. Availability:
Cost savings were realized upon completion of both the Citywide Street and Storm
Drain Improvement Project and Bay Avenue Drainage Project. Upon approval of the
recommended Budget Amendment to transfer monies from these completed projects,
sufficient funds will be available in the following account for completion of the Buck
Gully Wetlands and Maintenance Road Repairs Project:
Account Description
General Fund
Prepared by:
Steve Luy, P.E.
Associate Civil Engineer
Attachment: Budget Amendment
Account Number
7014- C5100659
Total:
Amount
$ $51,500
$ $51,500
Submitted by:
e t en G. Badum
-- ublic Works Director
City of Newport Beach
BUDGET AMENDMENT
2007 -08
EFFECT ON
BUDGETARY FUND BALANCE:
7013
General Fund - Street Projects
Increase Revenue Estimates
PX
C5100019
Increase Expenditure Appropriations AND
Division
Number
Transfer Budget Appropriations
SOURCE:
Account
Number
C5100829
from existing budget appropriations
Division
Number
from additional estimated revenues
General Fund - Miscellaneous & Studies
Account
from unappropriated fund balance
EXPLANATION:
This budget amendment is requested to provide for the following:
NO. BA- 08BA -046
AMOUNT: 551,500.00
Increase in Budgetary Fund Balance
Decrease in Budgetary Fund Balance
rx I No effect on Budgetary Fund Balance
To transfer expenditure appropriations from the Citywide Street and Storm Drain Improvement Project and the Bay Avenue
Drainage Project to the Buck Gully Wetlands and Maintenance Road Repair Project.
ACCOUNTING ENTRY:
BUDGETARY FUND BALANCE
Fund Accoun
REVENUE ESTIMATES (3601)
Fund /Division Account
EXPENDITURE APPROPRIATIONS (3603)
Description
Description
Description
Division
Number
7013
General Fund - Street Projects
Account
Number
C5100019
Street, Bikeway, & Parking Lot Striping
Division
Number
7012
General Fund - Drainage Projects
Account
Number
C5100829
Bay Avenue Drainage /Street Repair
Division
Number
7014
General Fund - Miscellaneous & Studies
Account
Number
C5100659
Buck Gully Restoration
Division
Number
Account
Number
Division
Number
Account
Number
Signed:
Signed:
Signed
Approval: Administrative Services Director
Administrative Approval: City Manager
City Council Approval: City Clerk
Amount
Debit Credit
$25,000.00
$26,500.00
$51,500.00
Date
Date
Date
t