Dubuque Water Supply Well Repair and Rehabilitation Project 2020_Hearing Copyrighted
October 5, 2020
City of Dubuque Public Hearings # 2.
City Council Meeting
ITEM TITLE: Dubuque Water Supply Well Repair and Rehabilitation Project 2020
(Wells 3,6,and 8)Project
SUM MARY: Proof of publication on notice of public hearing to consider approval of
the plans, specifications, form of contract and estimated cost for the
Dubuque Water Supply Well repair and Rehabilitation Project 2020
(Wells 3, 6, and 8), and the City Manager recommending approval.
RESOLUTION Approval of plans, specifications, form of contract and
estimated cost for the Dubuque Water Supply Well repair and
Rehabilitation Project 2020 (Wells 3, 6, and 8)
SUGGESTED Suggested Disposition: Receive and File;Adopt Resolution(s)
DISPOSITION:
ATTACHMENTS:
Description Type
Dubuque Water Supply Well Repair and Rehab City Manager Memo
Project-MVM Memo
Dubuque Well Repair and Rehabilitation Project 2020 Staff Memo
Resolution Resolutions
Proof of Publication Supporting Documentation
Dubuque
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TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Public Hearing for the Dubuque Water Supply Well Repair and
Rehabilitation Project 2020 (Wells 3, 6 and 8)
Project (CIP 7401415)
DATE: September 28, 2020
Water Department Manager Denise Blakeley Ihrig recommends City Council approval of
the plans, specifications, form of contract and estimated cost of$205,700 for the
Dubuque Water Supply Well Repair and Rehabilitation Project 2020 (Wells 3, 6 and 8).
I concur with the recommendation and respectfully request Mayor and City Council
approval.
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Mic ael C. Van Milligen
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Attachment
cc: Crenna Brumwell, City Attorney
Cori Burbach, Assistant City Manager
Denise Blakeley Ihrig, Water Department Manager
Dubuque
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TO: Michael C. Van Milligen, City Manager
FROM: Denise Blakeley Ihrig, Water Department Manager
DATE: September 28, 2020
RE: Public Hearing for the Dubuque Water Supply Well Repair and
Rehabilitation Project 2020(Wells 3,6, and 8)
Project (CIP 7401415)
INTRODUCTION
The purpose of this memorandum is to request approval of the plans, specifications,
form of contract and estimated cost for the Dubuque Water Supply Well Repair and
Rehabilitation Project 2020 (Wells 3,6, and 8) through the adoption of the attached
resolution.
BACKGROUND
The City of Dubuque's source water supply is pumped from five shallow and four deep
wells.
The five (5) shallow alluvial wells, Wells 2, 3, 4, 9, and 10, are located on the Hawthorne
Street boat ramp peninsula of the Mississippi River. Well depths vary from 127 feet to
200 feet below ground level, and all are cased to 100 feet. Individual well capacities
range from 1.55 to 3.30 million gallons per day (MGD), with a theoretical combined
capacity of all five wells at 14.15 MGD.
The four (4) deep wells, Wells 5, 6, 7, and 8, are located within a 1,500-foot radius of
the treatment plant. The wells are cased to 500 feet below ground elevation and
individual well depths vary from 1,000 feet to 1,800 feet below ground. The individual
well capacities range from 0.9 to 3.25 MGD with the theoretical combined capacity of
9.6 MGD.
The City's Water Department operates and maintains the wells to their maximum
available capacity to ensure the City is ready to serve changing water demands. The
wells are operated in rotation to allow water levels to recover in the well column and to
reduce and prevent cavitation of the well pump in the event the water column is drawn
down too far. The wells must also be maintained to ensure the pumps are operating
efficiently, the well casing is in good condition, identify issues with the well borehole,
and inspect the air and sample lines.
DISCUSSION
Well No. 3 and Well No. 6
Well No. 3 was constructed in 1956, it is 28-inches in diameter to a depth of 200-ft, and
has an average pumping capacity of 3.5-million gallons per day. The well is formed in
the alluvial sand and gravel geology along the Mississippi and has been identified as
having loss or reduction in pumping capacity. The loss, based on earlier maintenance
records showing application of an acid, is indicative that there was most likely mineral
scaling which would plug the well screen and reduce pumping capacity. The acid is
used to dissolve the mineral deposits. The well was treated with an acid application in
1963, 1982, 1995, and was jetted in 2013. Current measurements show the well to be
pumping an average 2.5 MGD or 40% below its capacity. Further, in July 2020, the well
tested present for total coliforms, while no fecal coliforms were present, the well was
taken off line pending further investigation. The well site was inspected by William
O'Brien from Water & Resource Recovery Center and it was determined the sampling
line and sampling port should be relocated and replaced during well maintenance. In
addition, as it is unclear where the coliforms are originating, the well should also be
shock chlorinated along with all internal well lines.
Well No. 6 was constructed in 1935, is 24-inches in diameter to a depth of 1,504-ft, and
has an average pumping capacity of 2.5-million gallons per day. The well has been
identified as having loss or reduction in pumping capacity. The reduction in pumping
capacity is attributed to possible wear and tear on the pump bowls and the location of
the pumping bowl assembly in the well borehole. The current pump is estimated to be
producing 1.5 MGD or 1,050 gallons per minute at a pump efficiency of 63%. According
to pump manufacturers, the BEP or best efficiency point will be experienced between
70% and 120%, according to the Hydraulic Institute the optimum best efficiency point is
85%. If a pump is operating outside of its BEP, energy is wasted leading to increased
electricity costs and the pump will most likely experience premature wear and tear
leading to loss of pumping capacity. Well No. 6 was last inspected in 2003.
In both cases, to more accurately determine if the loss of capacity is associated with
pump wear and tear or other well borehole issues such as screen plugging, the
recommendation is to obtain cost estimates from a State of lowa certified well and pump
contractor to pull the pump bowl assembly from the well, inspect the pump and
appurtenances along with an inspection of the borehole.
The contractor will be responsible for disconnection of the motor and removal of the
pump bowl assembly. The contractor will then remove the well column pipe so the wells
can be televised to determine the condition of the borehole, screen, gravel pack, and
casing. Having removed the motor, pump bowl assembly, and column pipe, the
contractor will perForm an inspection and examination of the pump, motor, and column
pipe in a controlled environment where an in-depth evaluation of the assembly can be
conducted to determine if the pump assembly or column pipe needs to be replaced or
rehabilitated to improve efficiency. The request for bid will include a cost for
replacement pump bowl assembly, column pipe rehabilitation, shock chlorination,
application of an acid or air-shocking, and downhole well televised inspection.
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Well No. 8
Well No. 8 was last repaired and rehabilitated in 2016, however the air-line is no longer
functioning properly to provide the well water levels. It is necessary to report the static
and pumping water levels to the lowa Department of Natural Resources and should be
resolved as soon as possible.
PROJECT SCHEDULE
The schedule for the project is as follows:
Initiate Public Bidding Process September 21, 2020
Publish Notice to Bidders, Advertise for Bids September 25, 2020
Publish Public Hearing Notice on Plans & Specs September 25, 2020
Public Hearing on Plans & Specs October 5, 2020
Receipt of Bid Proposals (Bid-Letting) October 22, 2020
Award Construction Contract November 2, 2020
Project Completion Date March 31, 2021
BUDGETIMPACT
The project is being bid as a whole to obtain economy of scale and to ensure the
sequence of taking wells off line is carefully coordinated with one contractor and the
operations staff without loss of production.
The estimate of probable cost for the Dubuque Water Supply Well Repair and
Rehabilitation Project 2020 (Wells 3, 6, and 8) is as follows:
Description Estimate
Construction Contract $170,000
Contingency (10%) $17,000
Construction Engineering & Inspection (10%) $18,700
Estimated Total Project Cost $205,700
FUNDING SOURCE
I have confirmed with Jennifer Larson, Director of Finance and Budget that Capital
Improvement Project 7401415 is available to fund the project.
The summary of available funds is:
CIP NO. Fund Description Amount
7401415 Wells Rehabilitation $250,000
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The available resource balance after the project is estimated to be $44,300.
ACTION TO BE TAKEN
The City Council is requested to approve the plans, specifications, form of contract and
estimated cost for the Dubuque Water Supply Well Repair and Rehabilitation Project
2020 (Wells 3,6, and 8) through the adoption of the attached resolution.
cc: Jenny Larson, Director of Finance & Budget
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RESOLUTION NO. -20
APPROVAL OF PLANS, SPECIFICATIONS, FORM OF CONTRACT, AND
ESTIMATED COST FOR THE DUBUQUE WATER SUPPLY WELL REPAIR AND
REHABILITATION PROJECT 2020 (WELLS 3, 6, AND 8)
NOW THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY
OF DUBUQUE, IOWA:
The proposed plans, specifications, form of contract and estimated cost for the
Dubuque Water Supply Well Repair and Rehabilitation Project 2020 (Wells 3, 6, and 8)
in the amount of $205,700, are hereby approved.
Passed, adopted and approved this day of , 2020.
Roy D. Buol, Mayor
Attest:
Kevin S. Firnstahl, CMC, City Clerk
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STATE OF IOWA SS: i
DUBUQUE COUNTY i
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CERTIFICATE OF PUBLICATION i
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I, Kathy Goetzinger, a Billing Clerk for Woodward ;
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Communications, Inc., an Iowa corporation, publisher i
of the Telegraph Herald, a newspaper of general k
circulation published in the City of Dubuque, County i
of Dubuque and State of Iowa; hereby certify that the '
attached notice was published in said newspaper on the �
following dates:
09/25/2020 ;
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and for which the charge is 36.70 I.
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Subscribed to before me, a Notary Public in and for �
Dubuque County, Iowa, ;
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this 25th day of September, 2020
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- Notary P blic in and for Dubuque Cou ty� , Iowa. �
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G�' a •� JANE'T K. PAPE i
�� : Co�rmm�ia�lp�n Murnb�er 18�9659 I
•:,,� 6�ty Comm,�xp.D�C 11,2022 �
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Ad text : CITY OF DUBUQUE, IOWA
OFFICIAL NOTICE - �
NOTICE OF PUBLIC HEARING ON PLANS, SPECIFICATIONS, FORM OF �
CONTRACT, AND ESTIMATED COST FOR DUBUQUE WATER SUPPLY WELL
REPAIR AND REHABILITATION PROJECT 2020 (WELLS 3, 6, AND 8) �
NOTICE IS HEREBY GIVEN: The City Council of the City of
Dubuque, Iowa will hold a public hearing on the proposed I
plans, specifications, form of contract and estimated cost for �
the Dubuque Water Supply Well Repair and Rehabilitation �
Project 2020(Wells 3, 6, and 8), in accordance with the f
provisions of Chapter 26, Code of Iowa, at 6:30 p.m., on the �
5th day of October 2020, in the Historic Federal Building �
Council Chambers (and/or by virtual means), 350 West 6th j
Street, Dubuque, Iowa. Said proposed plans, specifications, �
form of contract and estimated cost are now on file in the :
office of the City Clerk. At said hearing any interested 4
person may appear and file objections thereto. I
The scope of the Project is as follows:
Project involves the repair and rehabilitation of three � �
municipal drinking water supply wells (Wells 3, 6, and 8). �
Copies of supporting documents for the public hearing are on
file in the City Clerk's Office, City Ha11, 50 W. 13th St., ;
Dubuque, Iowa, and may be viewed during normal working hours.
A�endas can be accessed at I
https://www.cityofdubuque.org/Agendas.
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Written comments regarding the above public hearing should �
be submitted to the City Clerk's Office, 50 W. 13th St., I'{
Dubuque, IA 52001, ctyclerk@cityofdubuque.org, on ar before �
said time of public hearing. At said time and place of public '
hearings all interested citizens and parties will be given an �
opportunity to be heard for or against said proposal. �
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Individuals with limited English proficiency, vision,
hearing or speech impairments or requiring special assistance �
should contact the City Clerk's Office at(563) 589-4100, �
TDD/TTY(563) 690-6678, ctyclerk@cityofdubuque.org as soon as '
feasible. Deaf or hard-of-hearing individuals can use Relay : �
Iowa by dialing 711 or(800) 735-2942. '
In the event that a meeting at the Historic Federal Building �
location is not nossible as a result of the COVID-]9 pande�ic; �
instructions for a virtual meeting and public input will be �
posted on the meeting agenda on Friday, October 2, 2020 at
https://www.cityofdubuque.org/agendas.
Published by order of the City Council given on the 21 st day
of September 2020.
Kevin S. Firnstahl, CMC, City Clerk �
lt 9/25
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