Water Pollution Control Plant UpgradesMasterpiece on the Mississippi
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Water Pollution Control Plant Upgrades
DATE: April 14, 2010
Water Pollution Control Plant Manager Jonathan Brown recommends City Council
approval of the plans, specifications, form of contract and the estimated cost of $55
million for the Water Pollution Control Plant Upgrades Project.
I concur with the recommendation and respectfully request Mayor and City Council
approval.
Michael C. Van Milligen
MCVM:jh
Attachment
cc: Barry Lindahl, City Attorney
Cindy Steinhauser, Assistant City Manager
Jonathan R. Brown, Water Pollution Control Plant Manager
Dubuque
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Masterpiece on the Mississippi
TO:
FROM: Jonathan R. Brown, WPCP Manager
SUBJECT: Water Pollution Control Plant Upgrades
DATE: April 14, 2010
INTRODUCTION
The purpose of this memo is to provide background information for the Water Pollution
Control Plant (WPCP) modifications for the April 19, 2010 public hearing and to request
approval by council for the plans, specifications, form of contract and estimated cost for
the Water Pollution Control Plant Modifications.
BACKGROUND
The direction of the City of Dubuque's WPCP has been established as a high priority by
the City Council. A process of facility planning was approved and RFP's for the Water
Pollution Control Facility Plan were submitted to council on February 5, 2007.
Consultant selection to prepare the Facility Plan was approved by City Council in May
2007 and Strand Associates of Madison WI was contracted to proceed with planning.
The Facility Plan was submitted to IDNR in June 2008 for approval. In October 2008 the
team of Strand Associates /IIW Engineers was selected by council to proceed with the
design of the WPCP upgrades based on the concepts developed in the Facility Planning
process. In January 2010 90% design documents were presented to City Staff for
review. March 1, 2010 the City Council authorized City Staff to submit the design to the
Iowa Department of Natural Resources (IDNR) for review and to apply for a construction
permit. The City Council approved at their April 5, 2010 meeting the publication of a
Notice to Bidders to begin the bidding process and passed a resolution for preliminary
approval of plans, specifications, form of contract and estimated cost for the WPCP
Modifications.
DISCUSSION
Michael C. Van Milligen, City Manager
Dubuque
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2007
Strand Associates has completed the design and specifications for the upgrades of the
WPCP design level and submitted the design documents for review by City Staff. The
design includes improvements to nearly all portions of the existing WPCP. The following
is a brief summary of the recommended improvements:
Influent Screening
• Replace the existing screens with fine screens
• Install screenings washer /compactor
Grit Removal
• Replace the existing grit classifiers
• Eliminate the need for dewatered grit conveying by reorienting the grit classifiers
• Reconfigure grit pump discharge piping
• Reduced plugging potential of grit removal system
Primary Treatment
• Remove domed covers and replace with weir covers only
• Construct 4 primary clarifier
• Refurbish existing clarifiers
Biological Treatment
• Continue with High Purity Oxygen (HPO) activated sludge, including hauling
liquid oxygen to the plant
• Replace aeration mixers (27)
• Replace HPO controls for all three trains
• Repair basin tanks
• Seal concrete deck
Final Clarification
• Install new energy dissipating inlets
Effluent Disinfection
• Replace chlorination and dechlorination with ultraviolet light disinfection
• Reuse contact tank for UV installation
.Dissolved Oxygen and pH
• Install a cascade aeration system downstream of the UV basin. This will serve to
release CO2 to raise the effluent pH and dissolved oxygen.
Peak Flow Management
• Convert trickling filter structures to off -line flow equalization downstream of
primary clarification.
• Modify HPO basins to operate in contact stabilization mode of activated sludge
as needed.
Sampling and Flow Metering
• Provide two new influent samplers
• Provide new effluent sampler and sampling enclosure near the UV tank area.
Residuals Management
• Decommission the fluid bed incinerators.
• Construct new anaerobic digestion facilities (TPAD)
• Install new solids handling equipment in the existing incinerator building.
• Rehabilitate the WAS storage tanks and provide new WAS storage aeration
equipment.
• Provide two new dewatering centrifuges
• Convert existing incinerator building to biosolids cake storage and Toad -out
facilities.
Emergency Backup Power and Electrical Service
• Install new emergency power generation equipment.
• Replace electrical switchgear and distribution equipment from the 1970's and
before.
Administration Building, Laboratory, and Locker Rooms
• Laboratory Addition
• Refurbish the existing administration building
• Refurbish locker rooms in the administration building and the incinerator building.
• Energy Star rating for the Administration /Laboratory Building
Maintenance Building Addition
• Add two bays to existing Maintenance Building
Other Equipment Replacement
• Influent magnetic flow meters (2), effluent flow meter, and excess flow meter.
• Primary clarifiers drives
• Primary scum pumps
• Primary sludge transfer pumps
• RAS pump VFD replacement
• WAS pumps
• In -plant waste /recycle pumps
• Plant effluent/process water pump
• HVAC systems
Miscellaneous Piping, Valves, Mechanical and Other Components
• Influent channel gates
• Primary clarifier splitter gates
• MLSS splitter gates
• Final clarifier influent splitter gates
• Reroute in -plant waste /recycle pump discharge
• New septage /hauled waste receiving station
• New roofs on existing buildings
• New Cold Storage Building for City of Dubuque
upstream of the influent screens.
Engineering Department
Sustainability elements are included in many aspects of the design, most prominently in
the pursuit of energy star rating for the Administration Building, WPCP processes and in
the landscape design. The landscape design includes the use of rain gardens for
stormwater management and low mow /native prairie grasses.
Based on the March 12, 2010 Constructability Review by Story Construction the opinion
of probable cost for the project is $47 million dollars which includes a 10% contingency.
The total project cost including facility planning, design, construction and construction
services is estimated to be approximately $55 million.
This project is recommended to be financed by State Revolving Loan Funds, which offer
0% interest on the design loan and a below- market interest rate of 3.25% for the
construction loan. The impact on rates for construction of the Water Pollution Control
Plant upgrade is as follows:
FY2011 FY2012 FY2013 FY2014 FY2015 FY2016
Plant Renovation 4% 6% 8% 10% 7% 7%
Operating & Other Capital Needs 5% 5% 5% 5% 5% 5%
Total Sewer Fee Increase 9% 11% 13% 15% 12% 12%
The schedule for the project is as follows:
Attachments:
Notice to Bidders
Public Hearing
Receipt of Bids
Public Hearing
Award of Contract
Construction Begins
Substantial Completion
ACTION REQUESTED
April 9, 2010
April 19, 2010
May 20, 2010
June 7, 2010
June 7, 2010
Late Summer 2010
Early 2013
I respectfully request that the City Council approve the plans, specifications, form of
contract and estimated cost for the Water Pollution Control Plant Modifications.
cc: Steve Brown, Project Manager
Jenny Larson, Budget Director
RESOLUTION NO. 119-10
APPROVAL OF PLANS, SPECIFICATIONS, FORM OF CONTRACT, AND
ESTIMATED COST FOR THE WATER POLLUTION CONTROL PLANT
MODIFICATIONS
NOW THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY
OF DUBUQUE, IOWA:
That the proposed plans, specifications, form of contract and estimated cost for
the Water Pollution Control Plant Modifications, in the estimated amount $42,858,266
are hereby approved.
Attest:
eanne F. Schneider, CMC, City Clerk
Passed, adopted and approved this 19th day of April 2010.
Roy D. Buol, Mayor