HomeMy WebLinkAbout08 - Water Well Rehabilitation (Tamura Deep Well) — NOCQ �EwPpRT
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<,FORN'P City Council Staff Report
August 25, 2020
Agenda Item No. 8
TO: HONORABLE MAYOR AND MEMBERS OF THE CITY COUNCIL
FROM: David A. Webb, Public Works Director - 949-644-3311,
dawebb@newportbeachca.gov
PREPARED BY: Andy Tran, Senior Civil Engineer, atran@newportbeachca.gov
PHONE: 949-644-3315
TITLE: Water Well Rehabilitation (Tamura Deep Well) — Notice of
Completion for Contract No. 7427-2 (19W04)
ABSTRACT:
On July 9, 2019, City Council awarded Contract No. 7427-2 for the Water Well
Rehabilitation (Tamura Deep Well) project to General Pump Company, Inc. The work is
now complete and staff requests City Council acceptance and close out of the contract.
RECOMMENDATION:
a) Accept the completed work and authorize the City Clerk to file a Notice of Completion
for the project;
b) Authorize the City Clerk to release the Labor and Materials Bond 65 days after the
Notice of Completion has been recorded in accordance with applicable portions of
Civil Code; and
c) Release Faithful Performance Bond one year after acceptance by the City Council.
FUNDING REQUIREMENTS:
The adopted budget included sufficient funding for this contract. The construction
contract was expensed from the following account within the budget:
Account Description
Water Capital Pumping and Ops
Account Number
e/T2rew M
70201933-980000-19W04 $ 366,799.80
Total: $ 366,799.80
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Water Well Rehabilitation (Tamura Deep Well) — Notice of Completion for Contract No.
7427-2 (19W04)
August 25, 2020
Page 2
DISCUSSION:
Overall Contract Cost/Time Summary
Awarded
Final Cost at
Contingency
Actual
% Due to
% Due to
Contract Amount
Completion
Allowance
Contract
Directed
Unforeseen
Change
Change
Change
$473,660.00
$366,799.80
10% or less
-22.6%
-27.3%
+4.7%
Allowed Contract Time +
170
Actual Time
+1
Approved Extensions (days) =
Under (-) or Over (+)
This project included removal and reinstallation of a water well pump and motor, chemical
treatment and brushing, video surveys, caliper and gyroscopic surveys, replacement of
the existing pump, replacement of an exhaust fan at the Dolphin Deep well site, and
installation of a new ventilation system at both Dolphin and Tamura well sites.
The contracted work has now been completed to the satisfaction of the Public Works and
Utility Departments. A summary of the construction cost is as follows:
Original Bid Amount:
$
473,660.00
Actual Cost of Bid Items Constructed:
$
242,694.00
Total Change Orders:
$
124,105.80
Final Contract Cost:
$
366,799.80
The final contract cost was $366,799.80, which was approximately 22.6 percent lower
than the original bid amount. This cost decrease was primarily due to not needing the
optional well casing liner, which was included in the bid. Upon removal of the existing
pump and motor, the well was inspected and determined to be in good condition. As a
result, some of the well rehabilitation procedures were not necessary, which lead to
additional cost savings.
The contract change orders for the project involved installing a new ventilation system at
both well sites and replacing an exhaust fan at the Dolphin well site that failed during
construction. This change order was necessary to lower the temperature in the pump
control room produced by the variable frequency drives (VFDs) that run the vertical
turbine motors at each well site. The VFDs produce a constant level of high heat and
require a ventilation system to maintain cooler temperatures in order to properly function.
The exhaust fan at the Dolphin Deep well site coincidentally failed during the construction
phase. Since we had a professional design and construction team working on this project,
the replacement of the exhaust fan was added to this contract to expedite replacement of
this critical component.
8-2
Water Well Rehabilitation (Tamura Deep Well) — Notice of Completion for Contract No.
7427-2 (19W04)
August 25, 2020
Page 3
A summary of the project schedule milestones is as follows:
Estimated Start of Construction per Annual Baseline Schedule
10/28/2019
Actual Start of Construction Per Notice to Proceed
11/4/2019
Extended Contract Completion Date Inclusive of Extra Work
7/16/2020
Actual Substantial Construction Completion Date
7/17/2020
The ventilation upgrades at Dolphin and Tamura well sites consisted of mechanical fans
and motors with long lead times of eight weeks from the factory. Once the parts were
delivered, construction was completed in a timely and expeditious manner.
ENVIRONMENTAL REVIEW:
On July 9, 2019, the City Council found this project exempt from the California
Environmental Quality Act (CEQA) pursuant to Section 15302(c) Class 2, (reconstruction
of existing facility involving negligible or no expansion of capacity) of the CEQA
Guidelines, California Code of Regulations, Title 14, Chapter 3, because it has no
potential to have a significant effect on the environment.
NOTICING:
The agenda item has been noticed according to the Brown Act (72 hours in advance of
the meeting at which the City Council considers the item).
ATTACHMENT:
Attachment A — Location Map
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WATER WELL REHABILITATION
CITY OF NEWPORT BEACH
TAMURA DEEP
PUBLIC WORKS
DEPARTMENT
LOCATION MAP
C-7427-2
8/25/2020
8-4