Exhibit 1 - Agenda Information Sheet - Amendment 1City of Denton
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AGENDA INFORMATION SHEET
DEPARTMENT: Procurement & Compliance
ACM: David Gaines
DATE: December 14, 2021
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 Freese and Nichols, Inc., amending the contract approved by City Council on September 22,
2020, in the not-to-exceed amount of $1,472,700.00; said first amendment to provide additional design
services for the Ray Roberts Water Treatment Plant Uprating and Performance Improvements project;
providing for the expenditure of funds therefor; and providing an effective date (RFQ 6590-093 – providing
for an additional first amendment expenditure amount not-to-exceed $663,310.00, with the total contract
amount not-to-exceed $2,136,010.00).
INFORMATION/BACKGROUND
The Ray Roberts Water Treatment Plant is a conventional surface water treatment that uses ozone and
biologically activated filters as part of the disinfection process. This plant was designed in the late 1990s
and constructed in 2001. This facility uses the following processes to treat drinking water: pre-ozonation,
coagulation, flocculation, sedimentation, intermediate ozonation, biologically active filtration, disinfection,
and finished water storage and pumping. The Ray Roberts Water Treatment Plant Uprating and
Performance Upgrades project (Project), currently in design by Freese and Nichols, Inc., includes
improvements that were identified through a risk-based condition assessment. These improvements will
improve the reliability and redundancy of the processes and equipment at the Ray Roberts Water Treatment
Plant.
During the design of these improvements, additional data review and discussions with the Ray Roberts
Water Treatment Plant operations and maintenance staff revealed that the current filter backwash process
limits the staff’s operational flexibility, is inefficient, and creates challenges to treatment when upgrading
the facility. During the filtration process, water passes through the filters. As the water passes through the
filters, particulate materials, that were not removed during the sedimentation process, are removed. Over
time, these particulates accumulate and affect filter performance. To remedy this, the filters are backwashed
by reversing the flow of water throughout the filters to rinse them. This process restores filter capacity.
The current filter design is based on a rarely used self-backwashing filter arrangement. Over the past 20
years, there have been many process improvements to the facility. These improvements coupled with the
current rerating project have highlighted the need for us to optimize the filter backwash process. This
optimization will provide the Ray Roberts WTP operations staff with a greater degree of operational
flexibility and increase the reliability of the filter performance.
City Hall
215 E. McKinney Street
Denton, Texas
www.cityofdenton.com
This amendment will provide for the following design services:
1. Design of a one (1)-million-gallon ground storage tank to store water for filter backwashes.
2. Connection to the existing transfer pump station to fill the proposed backwash supply ground storage
tank with chlorine-free water.
3. Flow control valve at the transfer pump station connection to control the proposed backwash supply
ground storage tank fill rate.
4. Flow control valve at the proposed backwash supply ground tank to control the filter backwash rate.
5. Piping from the proposed ground storage tank to the existing filters, with piping connections to
allow future filter expansions.
6. Piping improvements within the existing filter pipe gallery to accommodate the proposed backwash
supply connections.
7. Control system modifications to support the backwash approach modifications.
The current project also includes the design work associated with the replacement of several electric valve
operators that are at the end of their useful life and are problematic for operations staff. The replacement of
these valve operators will allow all of the valve operators to have the same communication protocols and
ensure the continuity of service. The valves associated with these electrical valve operators are not included
for a replacement since they appear to be in good working order.
The total cost required to cover all the additional design effort is $663,310 and staff recommends
authorizing the proposed first amendment.
PRIOR ACTION/REVIEW (COUNCIL, BOARDS, COMMISSIONS)
On September 22, 2020, City Council approved a contract with Freese and Nichols, Inc., in the not-to-exceed
amount of $1,472,700 (Ordinance 20-1828).
On December 13, 2021, this item will be presented to the Public Utilities Board (PUB) for consideration.
RECOMMENDATION
Award Amendment No. 1 with Freese and Nichols, Inc., for additional design services for the Ray Roberts
Water Treatment Plant Uprating and Performance Improvements, project, in a not-to-exceed amount of
$663,310, for a total amended contract amount of $2,136,010.
PRINCIPAL PLACE OF BUSINESS
Freese and Nichols, Inc.
Denton, TX
ESTIMATED SCHEDULE OF PROJECT
The anticipated completion of this project is July 2022.
FISCAL INFORMATION
These services will be funded from Water Project Funds.
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: Chris Campbell, 940-349-7181.
Legal point of contact: Marcella Lunn at 940-349-8333.