Tamarack Sanitary Sewer Extension Project - Acceptance of Public Improvement Construction ContractCity of Dubuque
City Council
CONSENT ITEMS # 10.
Copyrighted
November 17, 2025
ITEM TITLE: Tamarack Sanitary Sewer Extension Project - Acceptance of
Public Improvement Construction Contract
SUMMARY: City Manager recommending City Council adopt the attached
resolution accepting the public improvement, establishing the
final contract amount at $686,185.63, and authorize the
payment of the final contract retainage amount of $34,309.28
to Boomerang Corp. for the Tamarack Sanitary Sewer
Extension Project.
RESOLUTION Accepting The Tamarack Sanitary Sewer
Extension Project
SUGGUESTED Receive and File; Adopt Resolution(s)
DISPOSITION:
ATTACHMENTS:
1. MVM Memo
2. Tamarack Sanitary Sewer Ext Project - Acceptance MEMO
3. Tamarack Sanitary Sewer Ext Project - Acceptance RESOLUTION
4. Tamarack Sanitary Sewer Ext Project - ENGINEERS CERTIFICATE
Page 177 of 750
THE CITY OF
DUBE
Masterpiece on the Mississippi
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Tamarack Sanitary Sewer Extension Project
Acceptance of Public Improvement Construction Contract
Project No. 5581500001
DATE: November 13, 2025
Dubuque
AI WIN av
2007-2012.2013
2017*2019
Assistant City Engineer Robert Schiesl is recommending City Council adopt the
attached resolution accepting the public improvement, establishing the final contract
amount at $686,185.63, and authorize the payment of the final contract retainage
amount of $34,309.28 to Boomerang Corp. for the Tamarack Sanitary Sewer Extension
Project.
The remaining balance of the SRF loan funding allocated for the Tamarack Sanitary
Sewer Extension Project, in the amount of $153,808.07, will be reallocated to
5581500009 to support the Granger Creek Lift Station Capacity Improvements project.
The final SRF loan amount will be established in the acceptance memo for the Granger
Creek Lift Station Capacity Improvements project.
I concur with the recommendation and respectfully request Mayor and City Council
approval.
k�4
Mic ael C. Van Milligen
MCVM:sv
Attachment
cc: Crenna Brumwell, City Attorney
Cori Burbach, Assistant City Manager
Gus Psihoyos, City Engineer
Jenny Larson, Chief Financial Officer
Bob Schiesl, PE, Assistant City Engineer
Max O'Brien, PE Civil Engineer
Todd Irwin, Water Resource Project Supervisor
Page 178 of 750
THE CITY OF
DUB E
Masterpiece on the Mississippi
TO: Michael C. Van Milligen, City Manager
FROM: Robert Schiesl, Assistant City Engineer
SUBJECT: Tamarack Sanitary Sewer Extension Project
Acceptance of Public Improvement Construction Contract
Project No. 5581500001
DATE: November 12, 2025
INTRODUCTION
Dubuque
*Awin ah
�I ICW1L CIVIC: I I�NA 1�
2007-2012.2013
2017*2019
The enclosed resolution provides for establishing the final contract amount, and
acceptance of the public improvement construction contract for the Tamarack Sanitary
Sewer Extension Project.
BACKGROUND
In 1998 the City began to extend sanitary sewer along Granger Creek, for the Dubuque
Technology Park development. The Granger Creek Interceptor Sewer (GCIS)
extension consisted of the Granger Creek Pump Station and approximately 17,600 LF
of both 20 inch and 18" diameter pipe. In 2015, the City extended the interceptor sewer,
continuing along Granger Creek and U.S. Highway 151/61, to the Dubuque Regional
Airport. The GCIS extension increased the sanitary Sewer Shed 4 to approximately
6,300 acres.
Since the GCIS and the extension to the Dubuque Regional Airport has been
completed, several adjacent areas, in or near Key West, have connected to the City's
sewer system such as; Table Mound Mobile Home Park, Kerrigan Heights Subdivision,
Truck Country, a portion of Twin Ridge Subdivision, and Silver Oaks Subdivision.
Tamarack Business Park and the City's Crossroads Industrial Park, along with other
adjacent parcels, are also able to be served by GCIS.
The City of Dubuque submitted a facility plan, based on the results of an intensive
evaluation of the existing interceptor collection and pumping systems that convey
sewage to the Water Resource Recovery Center (WRRC), to Iowa Department of
Natural Resources (IDNR), in September of 2021. The facility plan identified three
improvement projects related to the Granger Creek Interceptor Sewer System: Granger
Creek Lift Station Capacity Improvements, Twin Ridge Sanitary Sewer Extension and
lagoon abandonment and the Tamarack Sanitary Sewer Extension.
The Tamarack Sanitary Sewer Extension Project provides sanitary sewer service to the
existing unsewered commercial development, Tamarack Business Park, and provides
Page 179 of 750
future sanitary sewer service opportunities for the Crossroads Industrial Park area,
along with adjacent developed and undeveloped areas to the west.
DISCUSSION
The Tamarack Sanitary Sewer Extension Project has been completed by Boomerang
Corp. of Anamosa, Iowa in the final contract amount of $686,185.63. This is a 1.6%
increase from the original contract amount of 675,319.50.
BUDGET IMPACT
The Tamarack Sanitary Sewer Extension Project is one of three projects included in a
single State Revolving Fund (SRF) loan being utilized to fund the projects. The Twin
Ridge Sanitary Sewer Ext. and Lagoon Abandonment Project and the Granger Creek
Lift Station Capacity Improvements Project will be presented under separate memos.
The table below details the final total project cost for the Tamarack Sanitary Sewer
Extension Project:
Description
Award
Final
Planning & Design
$ 56,650.00
$ 57,296.10
Construction
675,319.50
686,185.63
Contract Admin / Construction Engineering
50,000.00
50,000.00
Contingency
73,472.39
10,866.13
City Staff & Legal
9,404.39
14,091.07
0.5% SRF Loan Origination Fees
1 5,153.001
5,153.00
Total Project Cost
$ 869,999.28
$ 823,591.93
The SRF loan, for all three projects, is being funded through multiple Fiscal Year
appropriations. The funding summary of the loan amount allocated to the Tamarack
Sanitary Sewer Extension Project is detailed below:
Project No.
Fund Description
Fund Amount
FY22
5581500001
Sanitary Sewer Extensions to Existing
$ 233,500.00
Developments
FY23
5581500001
Sanitary Sewer Extensions to Existing
339,700.00
Developments
FY24
5581500001
Sanitary Sewer Extensions to Existing
404,200.00
Developments
Total SRF Project Funding
$ 977,400.00
The remaining balance of the SRF loan funding allocated for the Tamarack Sanitary
Sewer Extension Project, in the amount of $153,808.07, will be reallocated to
5581500009 to support the Granger Creek Lift Station Capacity Improvements project.
The final SRF loan amount will be established in the acceptance memo for the Granger
Creek Lift Station Capacity Improvements project.
2
Page 180 of 750
RECOMMENDATION
I recommend that the City Council accept the public improvement, establishing the final
contract amount at $686,185.63, and authorize the payment of the final contract
retainage amount of $34,309.28 to Boomerang Corp. for the Tamarack Sanitary Sewer
Extension Project.
I further recommend that the SRF loan funding balance ($153,808.07) be reallocated to
5581500009 to support the Granger Creek Lift Station Capacity Improvements project.
ACTION TO BE TAKEN
The City Council is requested to adopt the attached resolution accepting the public
improvement, establishing the final contract amount at $686,185.63, and authorize the
payment of the final contract retainage amount of $34,309.28 to Boomerang Corp. for
the Tamarack Sanitary Sewer Extension Project.
Prepared by Todd Irwin, Water Resource Project Supervisor
cc: Jenny Larson, Chief Financial Officer
Bob Schiesl, PE, Assistant City Engineer
Max O'Brien, PE Civil Engineer
3
Page 181 of 750
Prepared by: Kerry Bradley, City of Dubuque Engineering 50 W. 131h Street Dubuque IA 52001 (563)589-4270
Return to: Adrienne N. Breitfelder, City Clerk, 50W 131' Street, Dubuque, IA 52001 (563)589-4100
RESOLUTION NO. 365-25
ACCEPTING THE TAMARACK SANITARY SEWER EXTENSION PROJECT
WHEREAS, the public improvement contract for the Tamarack Sanitary Sewer
Extension Project (the Project) has been completed by the Contractor, Boomerang Corp.
of Anamosa, Iowa, (Contractor), and the City Engineer has examined the work and
recommends that the Project be accepted; and
WHEREAS, the final contract amount for the Project is $686,185.63; and
WHEREAS, the Contractor has previously been paid $651,876.35, leaving a
retainage balance of $34,309.28; 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 $34,309.28 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 17th day of November 2025.
Attest:
Adrienne N. Breitfelddr, City Clerk
CITY ENGINEER'S CERTIFICATE OF FINAL COMPLETION OF TAMARACK
SANITARY SEWER EXTENSION PROJECT
The undersigned City Engineer of the City of Dubuque, Iowa, hereby certifies that
the Tamarack Sanitary Sewer Extension Project has been inspected, completed and
performed in compliance with the terms of the Public Improvement Contract, and that the
total cost of the completed work is $823,591.93.
Dated this 12th day of November 2025.
--(� D -
Gus Psihoyos, City Engineer
Filed in the office of the City Clerk on the 12th day of
November 2025.
Adrienne N. Breitfelder, City Clerk
Page 183 of 750