City of Culver City, California
Agenda Item Report
Meeting Date: 09/10/2012 Item Number: C-3
CITY COUNCIL AGENDA ITEM: 1) Acceptance of Work Performed by Pacific
Hydrotech Corporation; 2) Authorization to File the Notice of Completion; and 3)
Authorization to Release Retention Funds after the Expiration of the 35-Lien Period,
for the Construction of the Braddock Pump Station Upgrade Project, P-873.
Contact Person/Dept.: Andy O’Connell/PW Phone Number: (310) 253-5606
Fiscal Impact: Yes [X] No [] General Fund: Yes [] No [X]
Public Hearing: [] Action Item: [] Attachments: []
Commission Action Required: Yes [] No [X] Date: _______________
Public Notification: (E-Mail) Agenda and Meetings – City Council (09/05/12); Pacific
Hydrotech Corporation (09/04/12).
Department Approval:
Charles D. Herbertson (08/31/12)
City Attorney Approval:
Carol Schwab (by H. Baker) (09/04/12)
Chief Financial Officer Approval:
Jeff Muir (by K. Marsden) (09/05/12)
City Manager Approval:
John M. Nachbar (09/05/12)
RECOMMENDATION:
Staff recommends the City Council accept the work performed by Pacific Hydrotech
Corporation, authorize filing a Notice of Completion and authorize the release of
retention funds in the amount of $111,804.42 after the expiration of the 35-day lien
period, for the Braddock Pump Station Upgrade Project.
BACKGROUND/DISCUSSION:
On July 12, 2010, the City Council awarded a construction contract to Pacific
Hydrotech Corporation for the Braddock Pump Station Upgrade Project. This work
included the removal of the existing concrete subterranean dry well structure, a
concrete stairwell, pumps, motors, old electrical components, and the site’s concrete
surface. Upgrades to the station included the installation of a new wet well with
three submersible pumps, new electronics, new valves and valve boxes,
reconstruction of the existing emergency by-pass piping, and a new emergency
generator to accommodate the increased power load. Prior to the start of work, the
existing sewer discharge into the station had to be rerouted by the contractor by
installation of a temporary bypass system.
It was anticipated that ground water would be encountered at a depth of
approximately 21 feet during excavation. The bottom of the new wet well was to be
placed at a depth of 32 feet. Ground water was encountered at a depth of 21 feet
however the large volume was not anticipated. The groundwater was an
underground stream that had an estimated flow rate of 200 gallons per minute.
Dewatering of the pit area was very challenging and removal of underground
obstructions slowed the project completion by several months. City of Culver City, California
Agenda Item Report
Near the end of the project, it was decided to enlarge the station’s site area by
relocating the existing perimeter wall along Braddock Drive from approximately 15
feet from the back of sidewalk to 10 inches behind the sidewalk. This will provide an
additional area to store equipment or park vehicles within the secured site enclosure.
All landscaping around the site was removed and new planting and irrigation is
currently being designed by City staff which will be installed shortly.
The newly installed wet well and pumping system went online on August 3, 2011.
The remaining site work, including the new perimeter wall, additional site concrete
paving, and the repaving of Sawtelle Boulevard and Braddock Drive that was
damaged due the construction traffic occurring during the long project duration was
completed on March 16, 2012. Shortly after the new pumps came on line, critical
alarms were being reported. For the most part these alarms were programming
issues and the sewer pump station was never in danger of overflowing. After
several adjustments to the programing of the software and the location of the wet
well’s depth monitoring floats, it was decided to install a second set of depth
transducers. These were installed on June 14, 2012, and the station has been
running without any alarms triggered since. Therefore, at this point Pacific
Hydrotech has successfully completed the project.
FISCAL ANALYSIS:
The approved construction contract amount with Pacific Hydrotech was
$1,936,500.00, and the Public Works Director/City Engineer was authorized to
approve change orders in the amount not to exceed $317,475.00.
Project Budget
Funding Source Amount
P-873 Sewer Enterprise Fund (20480000 PZ873) $2435,000.00
Total Budget Amount $2,435,000.00
Final Project Expenses
Pacific Hydrotech Corporation original contract amount $1,936,500.00
Change order amount $ 299,588.32
Construction management, material testing and pump
rental amount
$ 184,442.29
Total Project Expenses $2,420,530.61
Approved Change Orders
1 Install temporary SCADA (emergency alarm) system. $ 7,951.47
2 Partial de-watering costs. $ 44,781.86
3
Reconnect existing probe meter; epoxy below grade
steel door to exist. wet well; removal of below grade $ 19,340.27 City of Culver City, California
Agenda Item Report
The unexpended balance will remain in the fund balance and be available for future
sewer-related capital projects and operations.
MOTIONS:
That the City Council:
1) Accept the work by the contractor Pacific Hydrotech Corporation for the
Braddock Pump Station Upgrade Project, Project P-873; and,
2) Authorize the Public Works Director/City Engineer to execute the Notice of
Completion and submit it to the Los Angeles County Recorder’s Office for
recordation, and;
3) Authorize the release of $111,804.42 in retention funds to Pacific Hydrotech
Corporation after the expiration of the 35-day lien period.
obstructions.
4
Final de-watering costs; special epoxy of new wet
well; removal of below grade obstructions. $ 69,752.44
5 Install by-pass force main in Braddock Drive. $ 62,292.28
6
Enlarge project site; reconstruct sidewalk along site
perimeter; install new electrical connection for existing
sewage analyzer. $ 50,929.10
7
Additional paving and traffic loops on Braddock Drive
and Sawtelle Boulevard. $ 44,540.90
Total Approved Change Orders $299,588.32