Acceptance of Cedar Street Force Main Air Vacuum Release Valve Replacement Project Copyrighted
January 19, 2021
City of Dubuque Consent Items # 8.
City Council Meeting
ITEM TITLE: Acceptance of CedarStreet Force MainAirVacuum Release Valve
Replacement Project
SUM MARY: City Manager recommending acceptance of the public improvement
contract for the Cedar Street Force Main Air Vacuum Release Valve
Replacement Project, as completed by Tschiggfrie Excavating Co., in
the final contract amount of$185,397.81.
RESOLUTION Accepting the Cedar Street Force Main Air Vacuum
Release Valve Replacement Project and authorizing the payment to the
contractor
SUGGESTED Suggested Disposition: Receive and File;Adopt Resolution(s)
DISPOSITION:
ATTACHMENTS:
Description Type
Cedar Street Force Main Air Vacuum Release Valve City Manager Memo
Replacement Project-MVM Memo
Staff Memo Staff Memo
Resolution Resolutions
Dubuque
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TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Cedar Street Force Main Air Vacuum Release Valve Replacement Project
Acceptance Construction Contract
C I P #710-2602
DATE: January 13, 2021
Project Manager Steve Sampson Brown is recommending acceptance of the public
improvement contract for the Cedar Street Force Main Air Vacuum Release Valve
Replacement Project, as completed by Tschiggfrie Excavating Co., in the final contract
amount of$185,397.81. This is 39.4% over the bid amount of$132,955.00 due to
unforeseen conditions which required additional work to bypass pump sewer flow
upstream to the Cedar Street Lift Station and plumbing and vault modifications needed
to launch the internal pipe inspection tool.
I concur with the recommendation and respectfully request Mayor and City Council
approval.
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Mic ael C. Van Milligen
MCVM:jh
Attachment
cc: Crenna Brumwell, City Attorney
Cori Burbach, Assistant City Manager
Gus Psihoyos, City Engineer
Steve Sampson Brown, Project Manager
Dubuque
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TO: Michael C. Van Milligen, City Manager
Gus Psihoyos, City Engineer
FROM: Steve Sampson Brown, Project Manager
DATE: January 11, 2021
RE: Cedar Street Force Main Air Vacuum Release Valve Replacement Project
Acceptance Construction Contract
CIP #: 710-2606
INTRODUCTION
The attached resolution provides for the acceptance of the Public Improvement Contract
for the Cedar Street Force Main Air Vacuum Release Valve Replacement Project.
BACKGROUND
In general, a force main system is comprised of lift stations and pressurized sanitary
sewer pipes known as force mains. Each component of the sanitary sewer utility lift station
and force main system requires periodic evaluation and improvements so that they
remain in reliable condition and can fulfill their vital role in conveying the City's wastewater
to the treatment plant. Approximately 80% of wastewater that flows to the Water &
Resource Recovery Center (W&RRC) for treatment arrives via the City's Cedar Street
and Terminal Street lift stations through a 30" and then 42" force main pipe network. The
existing 42" force main which runs between the Terminal Street Lift Station and the
W&RRC was constructed in 1977 and is made of prestressed concrete cylinder pipe. The
Cedar/Terminal force main system is beginning to show signs of wear and there is a need
to evaluate and plan for system improvements.
DISCUSSION
In June of 2019 the City Council authorized the release of a Request for Proposals (RFP)
related to selecting a vendor to conduct a remote, internal pipe inspection of the 42" force
main. After a vendor was selected, City staff and the project's consulting engineer from
Strand Associates, Inc. worked with the pipe inspection vendor to determine the best
insertion location for the inspection tool and the project schedule. The existing valve vault
at the intersection of 14t" Street and Sycamore Street was the selected location for
inserting the tool.
In March of 2020, in order to make this location ready to receive the pipe inspection tool,
this project was bid so that several modifications to the concrete value vault and force
main piping could be completed. This project included modifications and replacement of
Page 1 of 2
air release/vacuum valve on the Cedar Street force main. The work consisted of
demolition and modifications to the existing valve vault structure, excavation and
placement of a new structure top slab with improved access doors, and various ductile
iron pipe work including new air/vacuum valves, pipe restoration, and other minor items.
RECOMMENDATION
I recommend that the City Council accept the improvements and authorize the payment
of the contract amount of$185,397.81 to Tschiggfrie Excavating Co. for the Cedar Street
Force Main Air Vacuum Release Valve Replacement Project. The final contract amount
is 39.4% over the bid amount of$132,955.00 due to unforeseen conditions which required
additional work to bypass pump sewer flow upstream Cedar Street Lift Station and
plumbing and vault modifications need to launch the internal pipe inspection tool.
BUDGETIMPACT
The estimate of probable cost for this project is summarized as follows:
Descri tion Estimate Award Final
Construction Contract— Base Bid $135,000.00 $132,955.00 $185,397.81
Contingenc 10%) $13,500.00 $13,500.00 $0.00
Contract Admin $4,500.00 $4,500.00 $4,500.00
Total Project Cost $152,550.00 $150,955.00 $189,891.81
The funding summary for the Cedar Street Force Main Air Vacuum Release Valve
Replacement Project is as follows:
CIP Fundinq Source Amount
710-2606 Cedar and Terminal Street Force Mains and Lift $189, 891.81
Station Assessment and Improvements Pro'ect
ACTION TO BE TAKEN
The City Council is requested to adopt the attached resolution accepting the Public
Improvement Contract and to authorize the payment of the contract amount of
$185,397.81 to Tschiggfrie Excavating, Company of Dubuque, IA, for the Cedar Street
Force Main Air Vacuum Release Valve Replacement Project.
Attachments
SSB/kb
cc: John Klostermann, Public Works Director
Willie O'Brien, W&RRC Manager
Deron Muehring, Civil Engineer
Todd Irwin, Engineering Technician
F:\PROJECTS\Sanitary\Cedar-Terminal Lift Stations and FMs Assessment\Internal Pipe Inspection\City Council
Documentation\1_Initiate\Cedar St FM Air Vacuum Release Valve Replacement Acceptance Memo 01.11.2021.docx
Page 2 of 2
Prepared by Steve Sampson Brown Project Manager, 50 W. 13th St Dubuque IA 52001 (563) 589-4276
Return to Adrienne N. Breitfelder, City Clerk, 50 W. 13th St., Dubuque, IA 52001, (563) 589-4100
RESOLUTION NO. 10-21
ACCEPTING THE CEDAR STREET FORCE MAIN AIR VACUUM RELEASE VALVE
REPLACEMENT PROJECT AND AUTHORIZING THE PAYMENT TO THE
CONTRACTOR
WHEREAS, the public improvement contract for the Cedar Street Force Main Air
Vacuum Release Valve Replacement Project (the Project) has been completed by the
Contractor, Tschiggfrie Company, Inc. (Contractor), the City Engineer has examined the
work and recommends that the Project be accepted; and
WHEREAS; the final contract amount for the Project is $185,397.81;
WHEREAS, the Contractor has previously been paid $176,127.92, leaving a
balance of $9,269.89; and
WHEREAS, the City Council finds that the recommendation of the City Engineer
should be accepted.
NOW, THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF
DUBUQUE, IOWA:
Section 1. The recommendation of the City Engineer is approved, and the
Project is hereby accepted.
Section 2. The Finance Director is hereby directed to pay to the Contractor the
balance of the retainage of $9,269.89 as provided in Iowa Code chapter 573, and to pay
such retainage in accordance with the provisions of Iowa Code chapter 573 or Iowa Code
chapter 26.13.
Passed, approved and adopted this 19th day of January 2021.
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Roy D. B ol, Mayor
Attest:
Adrienne N. Breitfelder, City Clerk
CITY ENGINEER'S CERTIFICATE OF FINAL COMPLETION OF CEDAR STREET
FORCE MAIN AIR VACUUM RELEASE VALVE REPLACEMENT PROJECT
The undersigned City Engineer of the City of Dubuque, lowa, hereby certifies that
he has inspected the Cedar Street Force Main Air Vacuum Release Valve Replacement
Project has been performed in compliance with the terms of the Public Improvement
Contract, and that the total cost of the completed work is $185,397.81.
Dated this 13t" day of January 2021.
Gus Psihoyos, City Engineer
Filed in the office of the City Clerk on the 13th day of January 2021.
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Adrienne N. Breitfelder, City Clerk