HomeMy WebLinkAboutExhibit 1 - Agenda Information Sheet Amendment 1 City of Denton
AGENDA INFORMATION SHEET
DEPARTMENT: Procurement
ACM: Christine Taylor
DATE: October 13, 2026
SUBJECT
Consider adoption of an ordinance of the City of Denton, a Texas home-rule municipal corporation,
authorizing the approval of a first amendment to a Professional Services Agreement between the City of
Denton and Carollo Engineers, Inc., amending the contract approved by City Council on April 15, 2025, in
the not-to-exceed amount of $958,760.00; said first amendment to provide detailed design and grant
application support services for the Lake Lewisville Water Treatment Plant Dewatering Improvements
Phase II Project for the Water Utilities Department; providing for the expenditure of funds therefor; and
providing an effective date (RFQ 8213-004 – providing for an additional first amendment expenditure
amount not-to-exceed $369,020.00, with the total contract amount not-to-exceed $1,327,780.00). The
Public Utilities Board recommends approval (5 - 0).
STRATEGIC ALIGNMENT
This action supports Key Focus Area: Enhance Infrastructure and Mobility.
INFORMATION/BACKGROUND
At the Lake Lewisville Water Treatment Plant (LLWTP), ongoing operational issues are limiting the plant’s
ability to effectively dewater residual solids removed during treatment. On April 15, 2025, City Council
approved a contract with Carollo Engineers to complete preliminary and final design services, as well as
engineering support during construction, for improvements to the solids handling system. The authorized
scope includes evaluating the existing system, separating backwash and sedimentation flow streams,
designing a sludge holding tank, and recommending process improvements.
As part of this scope, the design of a sludge holding tank will improve solids consistency and provide critical
storage capacity once the existing lagoon is decommissioned. Carollo’s evaluation identified significant
dewatering challenges within the plant’s sole gravity thickener, which is the first stage of the dewatering
process. The thickener becomes overloaded during high-flow conditions, reducing treatment efficiency and
causing solids with excess water to wash over the weir and into the lagoon. Addressing this solids carryover
is necessary for successful lagoon decommissioning and future land repurposing. This amendment expands
the detailed design services to include the design of a second gravity thickener to resolve capacity
limitations and improve overall system reliability.
PRIOR ACTION/REVIEW (COUNCIL, BOARDS, COMMISSIONS)
On March 5, 2024, City Council approved RFQ 8213 for a prequalified list of firms for engineering services
City Hall
215 E. McKinney Street
Denton, Texas
www.cityofdenton.com
for various water and wastewater utilities projects for the Water Utilities Department (Ordinance 24-390).
On April 15, 2025, City Council approved a contract with Carollo Engineers, Inc., in the not-to-exceed
amount of $958,760 (Ordinance 25-642).
On October 5, 2026, the Public Utilities Board (PUB) recommended this item to the City Council for
consideration.
RECOMMENDATION
Award Amendment No. 1 with Carollo Engineers, Inc., to provide detailed design and grant application
support services for the Lake Lewisville Water Treatment Plant Dewatering Improvements Phase II Project
for the Water Utilities Department, in the not-to-exceed amount of $369,020, for a total amended contract
amount of $1,327,780.
PRINCIPAL PLACE OF BUSINESS
Carollo Engineers, Inc.
Dallas, TX
SUSTAINABILITY MEASURES
The contract for engineering services will help the City of Denton improve the solids handling process at the
Lake Lewisville Water Treatment Plant. Protect health, safety, and the environment by maintaining a high
level of drinking water quality in accordance with all regulatory requirements. The contract addresses the
need to improve the solids handling process at the Lake Lewisville Water Treatment Plant as required by
the City of Denton’s Water Utilities Department.
ESTIMATED SCHEDULE OF PROJECT
The LLWTP Dewatering project began design in April 2025. The construction plans are anticipated to be
completed in Quarter 4 of 2026.
FISCAL INFORMATION
These services will be funded from 630542523.1365.21100. Purchase Order #210851 will be revised to
include the first amendment amount of $369,020. The total amended amount of this contract is $1,327,780.
EXHIBITS
Exhibit 1: Agenda Information Sheet
Exhibit 2: Original Ordinance and Contract
Exhibit 3: Ordinance and Amendment 1
Respectfully submitted:
Lori Hewell, 940-349-7100
Purchasing Manager
For information concerning this acquisition, contact: Katherine Koch, (940) 349-7320.
Legal point of contact: Leah Bush at 940-349-8333.