Acceptance of Kerper Boulevard Sanitary Sewer Project Copyrig hted
December 7, 2020
City of Dubuque Consent Items # 6.
City Council Meeting
ITEM TITLE: Acceptance of Kerper Boulevard Sanitary Sewer Project
SUM MARY: City Manager recommending acceptance of the public improvement
contract for the Kerper Boulevard Sanitary Sewer Reconstruction
Project, as completed by Tschiggfrie Excavating Co.
RESOLUTION Accepting the Kerper Boulevard Sanitary Sewer
Reconstruction Project and authorizing the payment to the contractor
SUGGESTED Suggested Disposition: Receive and File;Adopt Resolution(s)
DISPOSITION:
ATTACHMENTS:
Description Type
Kerper Boulevard Sanitary Sewer Project-MVM Memo City Manager Memo
Staff Memo Staff Memo
Resolution Resolutions
Award Memo Supporting Documentation
Dubuque
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TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Kerper Boulevard Sanitary Sewer Reconstruction
CIP 7102663
DATE: December 1, 2020
City Engineer Gus Psihoyos is recommending acceptance of the public improvement
contract for the Kerper Boulevard Sanitary Sewer Reconstruction Project, as completed
by Tschiggfrie Excavating Co., in the final contract amount of$2,423,630.89, which is a
6.33% increase from the original contract amount of$2,279,444.90. The increase in
costs was due to contract items that ran over such as pavement, curb and gutter, and
backfill material due to unforeseen subsurFace conditions. Change orders in the amount
of $66,861.07 made up the rest of the overage and were due to unforeseen rubble
disposal, slope stabilization around the box culvert, and an added redundancy for
emergency by-passing of the new lift station.
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
Dubuque
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TO: Michael C. Van Milligen, City Manager
FROM: Gus Psihoyos, City Engineer
DATE: November 30, 2020
SUBJECT: Kerper Boulevard Sanitary Sewer Reconstruction
CIP 7102663
INTRODUCTION
The enclosed resolution provides for the acceptance of the Public Improvement
Contract for the Kerper Boulevard Sanitary Sewer Reconstruction Project.
BACKGROUND
The City experienced a significant sanitary sewer overflow in August 2015 in a heavy
industrial area along Kerper Boulevard. The overflow prompted an extensive
investigation as to how and why the overflow occurred. The investigation by City staff
found the overFlow had occurred due to premature weakening of the sanitary sewer.
The failed section of sanitary sewer was located through a 66-inch diameter storm
sewer which allowed wastewater to enter the storm sewer. An emergency repair was
conducted, along with heavy cleaning of the sanitary sewer. During heavy cleaning
operation of the Kerper Boulevard and the East 16t" Street sanitary sewers, significant
offset pipe joints and additional corroded pipe section were discovered. During the pipe
cleaning operations, the cleaning equipment was lodged in the ductile iron sanitary
sewer pipe. A second emergency excavation was conducted to retrieve the cleaning
equipment. Due to the condition of the existing ductile iron pipe only a temporary repair
could be made. A permanent repair was not feasible as pipe corrosion presented
difficulties in securing the sewer repair couplings. Since there are so many locations
where corrosion had affected the pipe along this section of Kerper Boulevard, it was
recommended that full replacement and relocation of the sanitary sewer be made.
DISCUSSION
The Kerper Boulevard Sanitary Sewer Reconstruction Project included the full
replacement of the failed gravity sewer system, on Kerper Boulevard, with a
combination of a force main and gravity system. The new alignment connected to a 24-
inch diameter sanitary sewer with sufficient capacity to accept flows from the Kerper
Boulevard industrial area and utilized a single lift station and force main. The new
alignment is located along the U.S. Highway 151/61 corridor, between E. 16t" Street and
Kerper Boulevard. The new alignment eliminated the Kerper Boulevard sanitary flow
from entering the existing undersized sanitary sewer at E. 16t" Street and Kerper
Boulevard.
The Kerper Boulevard Sanitary Sewer Reconstruction project was completed by
Tschiggfrie Excavating Co. of Dubuque, lowa in the final contract amount of
$2,423,630.89, which is a 6.33% increase from the original contract amount of
$2,279,444.90. The increase in costs was due to contract items that ran over such as:
pavement, curb and gutter, and backfill material due to unforeseen subsurface
conditions. Change orders in the amount of $66,861.07 made up the rest of the
overage and were due to unforeseen rubble disposal, slope stabilization around the box
culvert, and an added redundancy for emergency by-passing of the new lift station.
Attached is the award memo explaining the history of the project along with the details
for the complete redesign after the initial bids for the project were rejected.
RECOMMENDATION
I recommend that the City Council accept the improvements and authorize the payment
of the contract amount of $2,423,630.89 to Tschiggfrie Excavating Co. for the Kerper
Boulevard Sanitary Sewer Reconstruction Project.
BUDGETIMPACT
The project cost for the Kerper Boulevard Sanitary Sewer Reconstruction Project is
summarized as follows:
Description Estimate Award Final
Construction $ 3,894,152.10 $ 2,279,444.90 $2,423,630.89
Emergency Costs, Maintenance 469,822.00 469,822.00 489,822.00
Costs b - ass Pum in
Contingency 389,415.21 389,415.21 0.00
Contract Admin / Construction 214,178.00 214,178.00 500,154.05
En ineerin
4.967.567.31 3.352.860.11 3.413.606.94
The project funding is as follows:
CIP Fundinq Source Amount
7102663 Kerper Blvd Sanitary Sewer Reconstruction $2,423,630.89
State of lowa, Revolvin Loan Fund
Emergency Costs, Maintenance Costs (by-pass 489,822.00
Pum in
7102663 Kerper Blvd Sanitary Sewer $ 500,154.05
Construction, Desi n, Administration & Ins ection
Total Project Funding $3�413,606.94
ACTION TO BE TAKEN
I respectfully request adoption of the attached resolution accepting the improvements
and authorizing payment of the contract amount of $2,423,630.89 to Tschiggfrie
Excavating Co. for the Kerper Boulevard. Sanitary Sewer Reconstruction Project.
cc: Jenny Larson, Budget Director
John Klostermann, PW Director
Prepared by Adrienne N., Breitfelder, City Clerk Address: City Hall- 50 W. 13th St Telephone: (563) 589-4100
Return to: Adrienne N., Breitfelder, City Clerk Address: City Hall- 50 W. 13th St Telephone: (563) 589-4100
RESOLUTION NO. 348-20
ACCEPTING THE KERPER BOULEVARD SANITARY SEWER RECONSTRUCTION
PROJECT AND AUTHORIZING THE PAYMENT TO THE CONTRACTOR
WHEREAS, the public improvement contract for the Kerper Blvd. Sanitary Sewer
Reconstruction Project, (the Project) has been completed by the Contractor, Tschiggfrie
Excavating, Co. (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 $2,423,630.89;
WHEREAS, the Contractor has previously been paid $2,392,449.35, leaving a balance
of $31,181.54; 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 $31,181.54 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 7th day of December 2020.
Roy D uol, Mayor
Attest:
n"'71t A.
Adrienne N. Breitfelder, eity Clerk
CITY ENGINEER'S CERTIFICATE OF FINAL COMPLETION OF KERPER BLVD.
SANITARY SEWER RECONSTRUCTION PROJECT
The undersigned City Engineer of the City of Dubuque, lowa, hereby certifies that
he has inspected the Kerper Blvd. Sanitary Sewer Reconstruction Project has been
perFormed in compliance with the terms of the Public Improvement Contract, and that
the total cost of the completed work is $3,413,606.94.
Dated this 1St day of December 2020.
Gus Psihoyos, City Engineer
Filed in the office of the City Clerk on the 1 St day of December 2020.
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TO: Michael C. Van Milligen, City Manager
FROM: Gus Psihoyos, City Engineer
DATE: November 8, 2018
SUBJECT: Kerper Blvd. Sanitary Sewer Reconstruction
CIP 7102663
INTRODUCTION
The enclosed resolution authorizes the award of the construction contract for the Kerper
Blvd. Sanitary Sewer Reconstruction.
BACKGROUND
The City experienced a significant sanitary sewer overflow in August 2015 in a heavy
industrial area along Kerper Boulevard. The overflow prompted an extensive investigation
as to how and why the overFlow occurred. The investigation by City staff found the overFlow
had occurred due to premature weakening of the sanitary sewer. The failed section of
sanitary sewer was located through a 66-inch diameter storm sewer which allowed
wastewater to enter the storm sewer. An emergency repair was conducted; along with
heavy cleaning of the sanitary sewer. During heavy cleaning operation of the Kerper
Boulevard and the East 16th Street sanitary sewers, significant offset pipe joints and
additional corroded pipe section were discovered. During the pipe cleaning operations, the
cleaning equipment was lodged in the ductile iron pipe. A second emergency excavation
was conducted to retrieve the equipment. Due to the condition of the existing ductile iron
pipe only a temporary repair could be made. A permanent repair was not feasible as pipe
corrosion presented difficulties in securing the repair couplings. Since there are so many
locations where corrosion has affected the pipe, along this section of Kerper Blvd., it is being
recommended that full replacement and relocation of the sanitary sewer be made.
While sections of the collection system along Kerper Boulevard are in fair to good condition,
approximately 2,400 feet of 18-inch diameter ductile iron sanitary sewer is at risk between
Fengler Street and East 16t" Street. Additionally, approximately 1,800 feet of 18-inch
diameter vitrified clay sanitary sewer along East 16th Street is distressed and in need of
replacement to eliminate I&I issues due to settlements. Additionally, the 18-inch vitrified clay
pipe is under sized to serve the current level of development. The 18-inch ductile iron pipe,
along Kerper Boulevard, was installed in 1994 and the 18-inch vitrified clay pipe, along East
16t" Street, was installed in 1957.
The reason for the premature failure of the ductile iron pipe is unclear, however, following
several attempts to clean, televise, and repair the sewer it was discovered that the pipe wall
thickness is severely compromised. Further, the existing manholes show signs of sulfuric
acid attack and the section of pipe removed during the repair made in August of 2015
showed signs of extensive corrosion. Many reasons are known as to how hydrogen sulfide
can develop in a system such as low pH in the wastewater and reduced velocity or
increased retention time of wastewater in the collection system.
Engineering staff have identified several different issues with the Kerper Blvd. sanitary
sewer and investigated different options for the replacement of the sewer. Staff selected
one of the options and issued the design for bidding in May of 2017. The estimated
construction cost of the project was $3,762,675.00. Two Bids were received on June 8,
2017, for the Kerper Blvd, Sanitary Sewer Reconstruction project. The bids were
substantially over the estimated construction cost with a low bid of$5,494,539.26, both bids
were rejected.
DISCUSSION
Engineering staff re-evaluated the design for cost saving measures and developed three
additional design alternatives for consideration. The selected alternative is for full
replacement of the failed gravity sewer system, on Kerper Boulevard, with a combination of
a force main and gravity system. The new alignment will start at an existing manhole,
connected to a 24-inch diameter sanitary sewer with sufficient capacity to accept flows from
the Kerper Boulevard service area. Approximately 2/3 of the project will be able to be
constructed within public right-of-way, the remaining 1/3 will be constructed on easements
across private property.
The selected alternative reduces estimated construction costs and impact to businesses and
traffic along E. 16th Street, near Kerper Blvd. This was achieved by modifying the previous
alignment and utilizing a single lift station and force main. The modified alignment is located
along the U.S. Highway 151/61 corridor, between E. 16t" Street and Kerper Blvd. The single
lift station allows for a much shallower pipe installation and avoids the need for dewatering
and specialized trench shoring for that portion of the project. This alignment modification
also eliminated the majority of pavement replacement costs on E. 16th Street and at the
intersection with Kerper Blvd. This change in alignment also avoids the need to close the
U.S. Highway 151/61 ramps, at Kerper Blvd., and virtually eliminates the access impact to
businesses along E. 16t" Street.
Additionally, the new project scope eliminates the costs associated with the replacement of
the 1950's era sanitary sewer along East 16t" Street. Currently the existing sewer is
undersized for the area that it serves. The modified alignment eliminates the Kerper Blvd.
sanitary sewer flow from entering the existing undersized sanitary sewer on E. 16t" Street.
The elimination of the Kerper sanitary sewer flow, from the E. 16t" Street sanitary sewer,
also has the potential to reduce future sewer replacement costs. The existing sewer, on E.
16t" Street, could be replaced with a smaller diameter pipe and at a reduced depth.
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In late July, Engineering staff revised the previously submitted and approved facility plan to
reflect the revised concept. The estimated cost of$3,774,954.70, for the revised concept,
was also included as part of the amended facility plan. The lowa Department of Natural
Resources (IDNR) have reviewed and approved the amended facility plan so that the City
can apply for a SRF loan to cover construction and contingency cost. The Engineering and
design costs will be paid by the sanitary construction fund.
The final design was completed the week of October 1St, along with a construction cost
estimate based on the completed design. The final construction cost estimate including, a
contingency of$389,415.00 is $4,283,567.31, which is $508,612.61 more than what was
submitted with the facility plan, in July, and $1,083,567.00 more than the previously
approved Intended Use Plan (IUP).
The plans, specifications, estimate and IUP application were approved by the IDNR, and a
sanitary sewer construction permit has been issued to the City of Dubuque for the project.
While there have been costs related to the delay in completing the project by not awarding
the $5,494,539 bid in June 2017 the savings have far outweighed those additional costs. In
April 2017, the Public Works department began continuous pumping which included staff
supervision of those pumps in order to get all the businesses along Kerper Blvd operating.
The cost to the City during this period including equipment, fuel, piping and labor is
estimated at $762,000. The savings on the redesign and rebid construction project is
$3,215,000. This savings to the City of Dubuque by redesigning the project after having
rejecting the original bid is $2,453,000 minus design work which was done by the City of
Dubuque Engineering Department staff.
BID RESULTS
Sealed bids were received on the project on November 8, 2018. Tschiggfrie Excavating Co.
of Dubuque, IA submitted the low bid in the amount of $2,279,444.90. This amount is
42.11% under the estimate of probable cost. A summary of the bid proposals is as follows:
Contractor Name Total Bid
Tschiggfrie Excavating Co. $2,279,444.90
Langman Construction $2,847,702.66
Legacy Corporation of IL $2,860,880.00
Boomerang Corp. $3,007,428.70
Topgrade Excavating, Inc. $3,203.113.10
Portzen Construction $3,281,321.67
Miller Trucking & Excavating $3,690,964.66
WC Stewart Construction $3,883,299.72
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RECOMMENDATION
I recommend that the contract for Kerper Blvd. Sanitary Sewer Reconstruction Project.be
awarded to Tschiggfrie Excavating Co. of Dubuque, lowa in the amount of$2,279,444.90.
Pending Approval from the lowa Financing Authority (IAF). lowa Department of Natural
Resources (IDNR) has stated all items are eligible.
BUDGETIMPACT
The summary of cost for the Kerper Blvd. Sanitary Sewer Reconstruction Project is
summarized as follows:
Description Estimate Award
Construction $ 3,894,152.10 $ 2,279,444.90
Emergency Costs, Planning & Design 469,822.00 469,822.00
Contingency 389,415.21 389,415.21
Contract Admin / Construction Engineering 214,178.00 214,178.00
$ 4,967,567.31 $ 3,352,860.11
The project funding summary is as follows:
CIP Fundin Source Amount
7102663 Kerper Blvd Sanitary Sewer Reconstruction $ 4,308,300.00
State of lowa, Revolvin Loan Fund
7102663 Kerper Blvd Sanitary Sewer $ 684,000.00
Construction, Desi n, Administration & Inspection
Total Project Funding $ 4,992,300.00
ACTION TO BE TAKEN
The City Council is requested to award the contract for the Kerper Blvd. Sanitary Sewer
Reconstruction Project to Tschiggfrie Excavating Co. through the adoption of the enclosed
resolutions.
Prepared by Todd Irwin, Engineering Technician
cc: Jenny Larson, Budget Director
John Klostermann, PW Director
Deron Muehring, Civil Engineer
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