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CITY OF WEST CHICAGO
INFRASTRUCTURE COMMITTEE
AGENDA ITEM SUMMARY
ITEM TITLE:
Resolution No. 19-R-0050 - Contract Award - Clark Dietz, | AGENDAITEMNUMBER: 3.
Inc. For Professional Engineering Services Associated with
the Wastewater Treatment Plant Digester #1 Improvement
Project COMMITTEE AGENDA DATE: October 3, 2019
COUNCIL AGENDA DATE: October 21, 2019
FILE NUMBER:
STAFF REVIEW: Robert E. Flatter, P.E., Director of Public Works sour Za
APPROVED BY CITY ADMINISTRATOR: Michael L. Guttman SIGNATURE
ITEM SUMMARY:
Under permit from the EPA, the West Chicago/Winfield Regional Wastewater Treatment Plant (WWTP)
has three digesters to manage incoming flows and solid loadings at the WWTP. The first two anaerobic
digesters (i.e., #1 and #2) are considered the primary digesters and are used to heat and mix the waste
solid (sludge) during the digestion process before it is dewatered, using belt filter presses, and taken to a
landfill. Digester #3 is not heated or mixed and is used as a secondary digester and storage.
In 2006 the secondary digester tank (i.e., Digester #3) was cleaned and repaired. During the period of
2010 thru 2013, the interior of Digester #2 was cleaned and repairs were made to the internal digestion
system equipment and components, including all gas safety equipment. Once repairs were completed
with Digester #2, it was determined in the best interest of plant operations to clean and transfer sludge
from Digester #1 into Digester #2; rather than generate new sludge for Digester #2 and pay to haul away
the sludge from Digester #1. Once Digester #1 was cleaned, the City hired Clark Dietz, Inc. (CDI) to
inspect Digester #1’s internal digestion system equipment and components. Significant repairs were
identified by CDI, who was then hired to perform Phase II engineering design services for the needed
repairs. However, for budgetary reasons, repairs were not initiated and Digester #1 has sat unused since
2013. Digester #1’s internal digestion system equipment and components are approximately thirty-three
(33) years old and have out performed their useful life (i.e., typically 15-20 years).
Being very familiar with the City’s Wastewater Treatment Plant and its digestion treatment process, and
having previously provided design services and construction oversight services for the WWTP Digesters,
and having already substantially completed design services for Digester #1, City staff approached CDI
and requested a cost proposal to finalize Phase II engineering design services, provide bid assistance,
and perform Phase III engineering construction oversight services associated with repairs to Digester #1.
CDI’s proposal is for a not to exceed amount of $80,700.00.
If approved, CDI will finalize design services and provide bid assistance during 2019 for an amount not to
exceed $21,660.00. Construction is not anticipated to start until FY 2020, where CDI will provide
construction oversight services for an amount not to exceed $59,040.00. Adequate funds are currently
budgeted/proposed in the West Chicago/Winfield Wastewater Authority Budget to cover said expenses.
Staff recommends that City Council award a professional services contract to Clark Dietz, Inc., for
Professional Engineering Services associated with the Digester #1 Improvement Project, for an amount

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CITY OF WEST CHICAGO
not to exceed $80,700.00.
ACTIONS PROPOSED:
Approve Resolution No. 19-R-0050 authorizing the Mayor to execute a contract with Clark Dietz, Inc., for
an amount not to exceed $80,700.00, for professional engineering services associated with the
Wastewater Treatment Plant Digester #1 Improvement Project.
COMMITTEE RECOMMENDATION:
The Infrastructure Committee voted 6-0 for approval.