HomeMy WebLinkAbout04.a. Review draft Position Paper to award a construction contract in the amount of $4,629,300 to Auburn Constructors, LLC, the lowest responsive bidder for the Influent Pump Electrical Improvements, District Project 7328; include award of the additive b Page 1 of 15
Item 4.a.
CENTRAL SAN BOARD OF DIRECTORS
. , , .
POSITION PAPER
. , 0
DRAFT
MEETING DATE: JULY 7, 2020
SUBJECT: REVIEW DRAFT POSITION PAPER TO AWARD A CONSTRUCTION
CONTRACT I N THE AMOUNT OF $4,629,300 TO AUBURN
CONSTRUCTORS, LLC, THE LOWEST RESPONSIVE BIDDER FOR THE
INFLUENT PUMP ELECTRICAL IMPROVEMENTS, DISTRICT PROJECT
7328; INCLUDE AWARD OF THE ADDITIVE BID ITEMS IN THE AMOUNT
OF $1,868,000; FIND THAT THE PROJECT IS EXEMPT FROM THE
CALI FORNIA ENVI RONMENTAL QUALITYACT (CEQA); AMEND AN
EXISTING AGREEMENT WITH BROWN AND CALDWELL TO INCLUDE
ENGINEERING SERVICES DURING CONSTRUCTION IN THE AMOUNT OF
$570,000, INCREASING THE COST CEILING TO $1,498,152; AND
AUTHORIZE A$676,000 TRANSFER FROM THE CAPITAL IMPROVEMENT
BUDGET CONTINGENCY TO FUND THE PROJECT
SUBMITTED BY: INITIATING DEPARTMENT:
NANCY MOLINA, ASSOCIATE ENGINEER ENGINEERINGAND TECHNICAL SERVICES-
CAPITAL PROJECTS
REVIEWED BY: CRAIG MIZUTANI, SENIOR ENGINEER
EDGAR J. LOPEZ, CAPITAL PROJECTS DIVISION MANAGER
JEAN-MARC PETIT, DIRECTOR OF ENGINEERING AND TECHNICAL
SERVICES
ISSUE
The Board of Directors (Board) must award the contract or reject bids within 50 days of the bid opening.
Authorization is required for the General Manager to execute the Contract Documents subject to submittal
requirements. Authorization is also required to amend an existing agreement in the amount of over
$100,000 and to transfer over$500,000 within the Capital Program.
BACKGROUND
Coronavirus (COVID-19) Impact: The Influent Pump Electrical Improvements, District Project 7328
(Project), is expected to start field construction activities in August of 2021 and be completed by October
of 2022. Due to the long lead items, such as the 400-horsepower pump and electrical gears, staff plans to
enter into contract soon and authorize the purchase of this equipment by the fall of this year. The
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construction contract for this Project includes provisions and costs to mitigate and prevent the spread of
COVI D-19, which includes handwash stations, personal protective equipment, and other safety items or
practices recommended by the Occupational Safety and Health Administration and guidelines from the
Contra Costa Health Services.
The Project: The Influent Pump Station is an essential and critical facility for daily operations. Without the
influent pumps, wastewater cannot be lifted to the downstream treatment processes or diverted to the
storage basins for flow equalization during wet weather events at the wastewater treatment plant (plant).
The influent pumps programmable logic controllers (PLCs) and variable frequency drives (VFDs)were
installed over 25 years ago, are difficult to maintain or support, and are at the end of their useful life. Two of
the VFDs have experienced failures over the past two years and had to be repaired. The VFDs and PLCs
are essential to the plant for managing influent flows, particularly during wet weather events. Furthermore,
the influent pump motors are in a dry pit room below grade that could be susceptible to internal flooding.
On November 15, 2018, the Board authorized staff to enter into an agreement with Brown and Caldwell
(B&C)for design services and electrical assessment support. This included a detailed investigation and
assessment of the Influent Pump Station electrical systems such as VFDs, motor control centers, PLCs,
and related electrical infrastructure. In addition, there was an evaluation of pumping capacity, an addition of
a sixth pump, and station resiliency.
The total findings recommended by Central San included an estimated $9,000,000 of renovation and
replacement work related to the electrical systems and the Influent Pump Station modifications. Staff has
prioritized the scope to include the most critical items to be constructed under this Project in the most cost-
effective manner. A project map is shown in Attachment 1.
Central San staff, with assistance from B&C, prepared the project documents. The Engineer's estimate
for construction was $6,900,000 for the base scope of work, which includes all the VFD's, new Pump No.
6, electrical and controls for all the equipment for the Project, as well as a large capacity drain pump
located inside the drywell. Pump Nos. 3 and 4 will swap location to increase pumping capacity resiliency
during wet weather. Two additive bid items were included for the installation of hydraulic isolation gates
within two wet wells and cleaning at a total estimated cost of $1,800,000.
This Project was advertised on May 22 and 28, 2020. Seven (7) sealed bids, ranging from $4,629,300 to
$6,846,000, were received and publicly opened on June 25, 2020. The Capital Projects Division
conducted a technical and commercial review of the bids and determined that Auburn Constructors, LLC
(Auburn) is the lowest responsive and responsible bidder with a bid amount of$4,629,300 as shown in
Attachment 2.
Bids for the additive bid items ranged from $1,868,000 to $3,832,000. Auburn provided the low bid cost
for a total of $1,868,000 for the additive bid items. Staff is recommending to proceed with the work and
add it to the construction contract. The bid alternative includes the addition of hydraulic actuated gates and
walkways to isolate the suction inlet ports to Pump Nos. 1 though 4. Adding the isolation gates will increase
reliability of the I nfluent Pump Station for flooding in the pump room. Also, this new feature would allow the
Influent Pump Station to operate during weather events without losing any pumping capacity.
Staff will administer the construction contract and provide construction management and administration.
Construction inspection will be performed by one of Central San's existing consultant inspection as-
needed agreements.
Staff recommends continuing services with B&C since they are the designer of record for the Project. An
amendment to the B&C agreement has been negotiated for engineering services during construction
(ESDC) at a cost not to exceed $570,000. These services include the standard submittal and shop
drawing reviews, responding to contractor questions, design clarifications, and potential design
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modifications needed during construction. Other services, such as providing controls support to optimize
the Influent Pump Station equipment, record drawings, and asset management related services, have
been requested by Central San staff to assist in providing a complete record and optimized system(s) at
the Influent Pump Station (Headworks)that includes recent improvements to Substation 16 and the newly
installed screenings equipment and loading facility.
CEQA
Staff has concluded that this Project is exempt from CEQA under CEQA Guidelines Section 15302,
because it involves replacement of existing sewer facilities at substantially the same locations and with the
same purpose and level of activity as the facilities being replaced.Approval of this Project will establish the
Board's independent finding that this Project is exempt from CEQA.
ALTERNATIVES/CONSIDERATIONS
The Board could consider the following alternatives:
1. Several approaches were evaluated during the planning and pre-design of this Project. This included
evaluating multi-projects or phasing, rehabilitation alternatives, operational risks, and construction
sequencing with other plant renovation type projects. Due to the several recent events related to the
VFDs and outages due to failed parts, staff recommends the Project as specified.
2. Reject additive bid items. Furnish and install four stainless steel hydraulic slide gate systems in Wet
Wells 1 and 2, catwalk/bridges, air/odor HVAC systems, wet well cleaning, etc. for$1,868,000. This
work will increase the resiliency of the pump station, but could be postponed and rebid under a
separate project within the next three years. However, postponement may not save Central San any
money.
3. Reject all bids, which is not recommended. This Project will address the aging and deficient
infrastructure at the plant and provide for long-term reliability and operational performance of the
Influent Pump Station.
FINANCIAL IMPACTS
The total estimated project cost is $9,586,000, which includes planning, design, construction contract,
contingency, construction management, and consultant costs as shown in Attachment 3. The Influent
Pump Electrical Improvements is included in the Fiscal Year(FY) 2020-21 Budget on page 207 with an
estimated total project budget of$8,910,000.
The existing B&C agreement value is $928,152. The amendment for ESDC is estimated at$570,000,
which will result in a new agreement value of$1,498,152.
An additional $676,000 is required to fund this Project with the additive bid items and staff proposes to
use the FY 2020-21 Contingency for the Capital I mprovement Budget (Cl B) as shown below:
Financial Impact Table Amount
0 Funds budgeted for FY 2020-21 for this Project $8,910,000
0 Funds taken from FY 2020-21 C I B contingency
Current balance of$2,100,000 $676,000
Total Cost $9,586,000
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COMMITTEE RECOMMENDATION
The Engineering and Operations Committee reviewed this matter at the July 7, 2020, meeting
and recommended
RECOMMENDED BOARD ACTION
Staff recommends the following:
1. Find the Project is exempt from CEQA;
2. Award a construction contract in the amount of $4,629,300 to Auburn Constructors, LLC, the lowest
responsive bidder for the I nfluent Pump Electrical I mprovements, District Project 7328;
3. 1 nclude award of additive bid items for the installation of new gates and related work in the amount of
$1,868,000;
4. Authorize the General Manager to execute the Contract Documents subject to submittal
requirements;
5. Authorize the General Manager to amend an existing agreement with Brown and Caldwell to include
engineering support services during construction in the amount of$570,000, increasing the
agreement cost ceiling to $1,498,152; and
6. Authorize a transfer of $676,000 from the FY 2020-21 CI B Contingency to fund the Project.
Strategic Plan re-In
GOAL TWO: Environmental Stewardship
Strategy 1—Achieve 100% compliance in all regulations
GOAL FOUR: Workforce Development
Strategy 4—Meet or exceed industry safety standards
GOAL FIVE: Infrastructure Reliability
Strategy 2—Execute long-term capital renewal and replacement program, Strategy 3—Protect personnel and assets
from threats and emergencies
GOAL SIX: Innovation and Optimization
Strategy 2—Improve and modernize operations through technology and efficiency measures
ATTACHMENTS:
1. Project Location Map
2. Summary of Bids
3. Post-Bid/P reconstruction Estimate
4. Presentation
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Attachment
CENTRAL SAN influent Pump Electrical Improvements
' District Project 7328 1
Project Location
Page 6 of 15
ATTACHMENT 2
INFLUENT PUMP ELECTRICAL IMPROVEMENTS
DISTRICT PROJECT 7328
SUMMARY OF BIDS
PROJECT NO.: 7328 NO. OF ADDENDA: 1 DATE/TIME: JUNE 25, 2020/2:00 PM
PROJECT NAME: INFLUENT PUMP ELECTRICAL IMPROVEMENTS
PROJECT MANAGER: NANCY MOLINA
PROJECT LOCATION: 5019 IMHOFF PLACE, MARTINEZ, CALIFORNIA
ENGINEER'S ESTIMATE: $6,900,000
NO. BIDDER BID PRICE
1 Auburn Constructors, LLC $4,629,300
Sacramento, California
2 C. Overaa and Company $5,280,000
Richmond, California
3 Blocka Construction, Inc. $5,829,000
Pleasanton, California
4 Anvil Builders, Inc. $5,889,000
San Francisco, California
5 Western Water Constructors $6,130,000
Santa Rosa, California
6 Kiewit Infrastructure West Company $6,283,000
Fairfield, CA
7 Shimmick Construction $6,846,000
Suisun City, California
BIDS OPENED BY: /s/Katie Young
DATE: June 25, 2020 at 3:00 p.m. via livestream due to COVID-19
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ATTACHMENT 3
INFLUENT PUMP ELECTRICAL IMPROVEMENTS
DISTRICT PROJECT 7328
POST-BID/PRECONSTRUCTION ESTIMATE
%of
Item Description Amounts Construction
No. Cost
1. CONSTRUCTION
a. Construction Contract $4,629,300
b. Addditive Bid Items (New Isolation Gates) $1,868,000
c. 10% Contingency $600,700
SUBTOTAL - CONSTRUCTION COST $7,098,000 100%
2. CONSTRUCTION MANAGEMENT
a. Central San Forces
- Construction Management $250,000
- Operations Support $100,000
b. Consultants
- Electrical Inspection (ArcSine Engineering) $140,000
- Brown and Caldwell for ESDC $570,000
SUBTOTAL - CONSTRUCTION MANAGEMENT $1,060,000 15%
3. PREBID EXPENDITURES (Planning and Design)
a. Central San Staff $500,000
b. Consultants (B&C) $928,000
SUBTOTAL- PREBID EXPENDITURES $1,428,000 20%
4. TOTAL ESTIMATED PROJECT COST $9,586,000
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ATTACHMENT 4
`l
INFLUENT PUMP ELECTRICAL
IMPROVEMENTS,
. DISTRICT PROJECT 7328
Engineering and Operations Committee
July 7, 2020
Edgar J. Lopez, P.E.
Capital Projects Division Manager
-- -- Jean-Marc H. Petit, P.E.
Director of Engineering and Technical Services
PROJECT MAIN OBJECTIVES
Resiliency: Reliability: Minimize Disruption:
• Increase capacity Modernize electrical Construction
during wet weather: and controls sequencing
events equipment
• Distribute the Variable frequency
• Quick recovery electrical loads to drive (VFD)/
from flooding reduce points of programmable logic
events failure on Switchgear controller(PLC)
• Minimize multiple (SWGR) 16 replacement staging
pumps out of Add a 6th pump to Renovation during
service increase wet weather dry weather
capacity
00 I
6
Pump station Rood resiliency Modem VFDs Updated PLCs and Construction
configuration instrumentation sequencing
1
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LOCATION OF PROJECT
13
-
9 B�� 11fille'rit
LEGEND
• StationQ1 1nlluerA Structure
®BVucwre 1
Q3$trllCtrlrelA
4 PreeereAon Tanks
3 �s Netraw«keonweo
i 00 PnmwDlnbb�enncnenoel�ebwe�
8 7 12 — ,,., QPnmery setlimema.�on Tenke
2 �Pnmery ElXuerA ChennN
09 SVucNre Centl BO"entl 72'PE Pipes
4 to SWCWreO
} t'S = _ 11 West Gtllery(below)
4 t®Gm SysWm
- I Q Pnmery OCU
1a Heedwaka OCU
t®SCB OCU
3
INFLUENT PUMP STATION
Influent Pump Gallery with Five Pumps
A�
I4
2
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PROJECT SCOPE
• Replacement of the Influent Pump VFDs for Influent Pumps
Station VFDs 71
• Upgrade electrical feed and motor
control centers (MCCs)to comply
with National Fire Protection
Association (NFPA) 70E (Arc Flash) j
• Update controls and PLCs k r.
• Add a 6th influent pump
I
iillli I I • _ �- ___
' � s
POWER AND LOAD REDISTRIBUTION FOR
INCREASED RELIABILITY & CAPACITY
16ATIE16B 16CTIE •D
1 1 1 1 1 1
700HP 400HP 400HP 700HP 700HP 400HP
N0.1 No.2 No.3 No.4 No.5 No.6
Improve resiliency,increase reliability,and minimize disruption
I6
3
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PUMP STATION DISTRIBUTION RELIABILITY
Fine Screens Fine Screens Old Screens
Existing Screen
#1 1 #2 #31#4f #5 1 146 \ Channel
Isolation Gates
Additive Bid Wet Well#1 Wet Well#2 Wet Well#3
Isolation Gates Existing Wet Well
Isolation Gates
■ L.G� �� Large
Capacity
Drain
1 1 1 1 V
p.mp
(1.5 MGD)
700HP 400HP 400HP 700HP 700No.1 No.2 No.3 No.4 No.5
I7
BID RESULTS
ENGINEER'S ES-nMATE: $6.900.000
NO. BIDDER BID PRICE
1 Auburn Constructors,LLC $4,629,300
Sacramento,California
2 Richmond and
Company
$5,280,000
ia
3 U=Construction,Inc. $5,829,000
Pleasanton,California
4 Anvil Builders,Inc. $5,889,000
San Francisca,California
5 Western Water Constructors $6,130,000
Santa Rosa,California
6 Kiewit Infrastructure West Company $6,283,000
Fairfield,CA
7 5blMOWI Construction $6,846,000
Suisun City,California
Ig
4
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ALTERNATIVE BID PUMP OPERATION WHEN
FLOODED - ADDITIONAL PROTECTION
Isolation gates stop
flooding ofthe dry wellOnepump out of service
instead of wet well and
two pumps out of service
9. -
LARGE SUMP PUMP flooding down quickly included
Alternative Bid (Base Bid) in Base Bid
Pump Isolation
INFLUENT Gate INFLUENT DISCHARGE DIVERSION
STRUCTURE SCREENS PUMPS METERVAULT CHANNEL
Improve resiliency,increase reliability,and minimize disruption.
I9
WET WELL ISOLATION GATES
Q 4
J
-
t
Total additive bid costs of$1,868,000
1 to
5
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ALTERNATIVES/CONSIDERATIONS:
The Board could consider the following alternatives or provide
other direction:
1. Several approaches were evaluated during the planning and pre-design of this
Project.This included evaluating multi-projects or phasing,rehabilitation
alternatives,operational risks,and construction sequencing with other plant
renovation type projects.Due to the several recent events related to the VFDs
and outages due to failed parts,staff recommends the Project as specified.
2. Reject additive bid items.Furnish and install four stainless steel hydraulic slide
gate systems in Wet Wells 1 and 2,catwalk/bridges,air/odor HVAC systems,
wetwell cleaning,etc.for$1,868,000.This work will increase the resiliency to the
pump station,but could be postponed and rebid under a separate project within
the next three years.
3. Reject all bids,which is not recommended.This Project will address the aging
and deficient infrastructure at the plant and provide for long-term reliability and
operational performance of the Influent Pump Station.
ti
ba -_
Iu
OVERALL PROJECT SCHEDULE
T,k 2019 upa�aB ,202 2021 2022
0 3 4 a Long lead items
Design •
Bidding Designed with
"ward and H" * shutdowns in mind
Procurement
Shutdown and Planning
Misc.and Stmctuml and Defined clear
mechanical
Switchgear Modifications constraints in bid
Feeder Re-distribution
Control System Programming documents
PLC lnstalladons
MCC Replacement Guide contractor
Vibrolions Monitonng Installations through safe sequence
Pump 6 and VFD
Pum pland VFD of shutdowns
Pum p2 and VFD
Pum p3aad VFD Shutdown planning
Pum p4 and VFD
WetWeatherHold early in construction
Pump and VFD
Pm;acf Closeoat Efficient schedule
Expected completion by October 2022
6
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TOTAL ESTIMATED PROJECT BUDGET
%of
Item Description Amounts Construction
NO, Cost
1. CONSTRUCTION
a.ConsWcton Contract $4,629,300
6. Addd five Bid Iterns(New Isolation Gates) $1,868,000
c 10%Contingency 8600.700
SUBTOTAL-CONSTRUCTION COST $7.098.000 100%
2. CONSTRUCTION MANAGEMENT
a-Central San Forces
Construction Management $250,000
Operations Support $100,000
6.Consultants
-Electrical I nspection(Arc&ne Engineering) $140,000
Bmxm and Caldwell for ESRC58 70.000
SUBTOTAL-CONSTRUCTIONMANACxFIVIENT $1.060.000 15%
3. PREBID EXPENDITURES(Planning and Design)
a.Central San SW 8500,000
6.Consultants{BRC} 8928,000
SUBTOTAL-PREBID EXPENDITURES $1.428,000 20%
4, TOTAL ESTIMATED PROJECT COST $9,586.900
I13
FUND TRANSFER
ProjectFinancial Impact Table: E M
Funds budgeted for FY 2020-21 for this $8,910,000
Funds taken from FY 2020-21 Budget
$676,000
Totalcontingency. Current balance of$2,100,000
$9,586,000
--- - - V.t I 14
X
7
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BOARD ACTIONS AND
STAFF RECOMMENDATIONS
1. Find the project is exempt from the California Environment Quality
Act;
2. Award a construction contract in the amount of$4,629,300 to Auburn
Constructors, LLC, the lowest responsive bidder for the Influent
Pump Electrical Improvements, District Project 7328;
3. Include the additive bid items for the installation of new gates and
related work in an amount of$1,868,000;
4. Authorize the General Manager to amend an existing professional
engineering services agreement with Brown and Caldwell to include
engineering support services during construction for$570,000; and
5. Authorize a transfer of$676,000 from the Fiscal Year 2020-21 CIB
Contingency to fund the Project.
QUESTIONS?
s
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