HomeMy WebLinkAbout11 - Dolphin Deep Water Well RehabilitationCITY OF NEWPORT BEACH
CITY COUNCIL STAFF REPORT
Agenda Item No. 11
March 11, 2008
TO: HONORABLE MAYOR AND MEMBERS OF THE CITY COUNCIL
FROM: Public Works Department
Andy Tran
949 - 6443315 or atran @city.newport- beach.ca.us
SUBJECT: Dolphin Deep Water Well Rehabilitation — Completion and
Acceptance of Contract No. 3978
RECOMMENDATIONS:
1. Accept the completed contract work.
2. Authorize the City Clerk to file a Notice of Completion.
3. Authorize the City Clerk to release the Labor and Materials bond 35 days after
the Notice of Completion has been recorded in accordance with applicable
portions of the Civil Code.
4. Release the Faithful Performance Bond 1 year after Council acceptance.
DISCUSSION:
On December 11, 2007, the City Council authorized the award of the Dolphin Deep
Water Well Rehabilitation project to General Pump Company. The contract provided
for cleaning of the water well casing and rebuilding the well pump and motor. The
contract has now been completed to the satisfaction of the Public Works Department.
A summary of the contract cost is as follows:
Original bid amount: $145,600
Actual amount of bid items constructed: $122,100
Total amount of change orders: $31,557
Final contract cost: $153,657
The decrease in the amount of actual bid items constructed over the original bid
amount resulted from the deletion of chemical and mechanical well development (Bid
Items No. 6 and 7). After reviewing the initial downwell video, staff discovered that the
condition of the well was better than expected and concluded that chemical and
mechanical well development would be too aggressive. As an alternative, staff decided
to proceed with airbursting, which is less destructive to the well casing and more
economical operation. The final overall construction cost including two change orders
Dolphin Deep Water Well Rehabilitation - Completion and Acceptance of Contract No. 3978
March 11, 2008
Page 2
was 5.5 percent over the original bid amount. The two change orders were as follows:
Change
Description
Amount
Order
1
Airbursting the perforated well casing zones — Well
$10,758
development operation in -lieu of chemical and
mechanical development Bid Items No. 6 and 7).
2
Additional work needed on the well pump and motor
$20,799
Total Project Change Orders
$31,557
In addition to the primary construction contract, this project involved other project
expenses. Total project expenses are summarized as follows:
Construction $153,657.00
Design — Richard C. Slade & Associates $24,950.00
Design — Traffic Control Engineering $3,000.00
Incidentals $85.50
Total Project Cost $181,692.50
Prior to rehabilitation, the water pumping rate was 2,500 gallons per minute (gpm).
With the work completed the new pumping rate is 3,200 gpm, nearly the same as when
originally constructed in 1996. The results of this water well rehabilitation project are
positive.
Environmental Review:
The project was determined to be exempt from the California Environmental Quality Act
(CEQA) pursuant to Section 15301 of the CEQA Implementation Guidelines at the time
the project was authorized by the City Council. This exemption covers the repair of
existing facilities involving negligible or no expansion of existing use.
Funding Avallabilitv:
Funds for the construction contract were expended from the following account:
Account Description Account Number
Water Enterprise 7503- C5500460
Amount
$153,657
Total: $153,657
The original completion date was February 19, 2008. All work was completed by this
date.
Prepared by:
Andy Tran-
Senior Civil Engineer
Submitted
m G. Badum
Works Director