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CITY OF WEST CHICAGO
INFRASTRUCTURE COMMITTEE
AGENDA ITEM SUMMARY
ITEM TITLE: Z
AGENDA ITEM NUMBER: _7- ©.
Resolution No. 23-R-0004 — Contract Execution — Clark
Dietz, Inc. Amendment #1 for Professional Engineering
Services related to the Headworks Influent Gate
Replacement Project at West Chicago/Winfield
Wastewater Authority Regional Wastewater Treatment
Plant in the amount not to exceed $25,320.00
STAFF REVIEW: Mehul Patel, P.E., CFM, Director of Public Works SIGNATURE. LA ——
APPROVED BY CITY ADMINISTRATOR: Michael L. Guttman
COMMITTEE AGENDA DATE: February 2, 2023
COUNCIL AGENDA DATE: February 20, 2023
SIGNATURE
ITEM SUMMARY:
The City of West Chicago and the Village of Winfield jointly own the WCWWA, which discharges to the
West Branch of the DuPage River under NPDES Permit No. IL0023469. The West Chicago/Winfield
Wastewater Authority (WCWWA) Regional Wastewater Treatment Plant (WWTP) receives and
processes over five million (5,000,000) gallons of raw sewage daily from the both the City of West
Chicago and the Village of Winfield. The flow enters the WWTP at two locations. The flow from City of
West Chicago enters the WWTP through a 36-inch gravity interceptor at the headworks while the flow
from Village of Winfield enters the WWTP through a 20-inch forcemain into the grit chamber,
The two influent gates that control the gravity flow into the headworks lift station and the bypass flow to
the excess flow clarifiers are currently inoperable. In September 2021, the WCWWA hired Clark Dietz,
Inc. (CDI) an engineering firm, to provide design services for the replacement of the two influent gates.
Its scope of work included replacement of the two influent gates, one downward opening weir gate and
one upward opening sluice gate; replace the motor operators and stands for the gates; specification for
bypass pumping during the project; structural upgrades to the chambers including corrosion protection;
grating and fall protection hatch upgrade, etc.
The Project was advertised for bids in the Daily Herald as well as on QuestCDN (an online bidding
platform) on January 6, 2022. A mandatory onsite pre-bid was conducted on January 13, 2022. Bids
were received on January 27, 2022 for the project. Of the four (4) plan holders that attended the
mandatory pre-bid meeting, only two (2) contractors submitted a bid. All bids were rejected due to bids
coming in much higher than the budgeted amount.
Staff has revised the budget and included this project in the 2023 Budget. In 2023, this project is
combined with the structural coating work associated with the primary clarifiers in an effort to attract more
bidders. CDI had provided the professional engineers services related to this project in 2022 for $16,135
under administrative approval. Staff has obtained a proposal from CDI as an amendment to the original
contract to include the additional scope of work and re-bid the project. The amendment also includes part
time construction oversight of the project. The amendment is for $25,320 for a total revised not to exceed
cost of $41,455.00. Staff feels the professional services fees are appropriate for an estimated $550,000
construction project.
The project is budgeted for in the Capital Improvements line item in the WCWWA Budget. The project

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CITY OF WEST CHICAGO
will likely begin construction in April 2023 and is anticipated to be completed by October 31, 2023,
pending material lead times.
ACTIONS PROPOSED:
Approve Resolution No. 23-R-0004 authorizing the Mayor to execute an Amendment #1 for Professional
Engineering Services to Clark Dietz, Inc. of Oakbrook Terrance, Illinois for the Headworks Influent Gate
Replacement Project at West Chicago/Winfield Wastewater Authority Regional Wastewater Treatment
Plant in an amount not to exceed $25,320.00
COMMITTEE RECOMMENDATION:
The Infrastructure Committee voted 7-0 for approval.