STRATEGIC PRIORITY: Sustainable
AGENDA DATE: September 24, 2025
COUNCIL DISTRICT(S): Citywide
DEPARTMENT: Dallas Water Utilities Department
EXECUTIVE: Dev Rastogi
______________________________________________________________________
SUBJECT
Title
Authorize an increase in the construction services contract with BAR Constructors, Inc., for additional work associated with replacing the existing sulfur dioxide piping and equipment for the sulfur dioxide evaporators at the Central Wastewater Treatment Plant - Not to exceed $1,873,456.25, from $48,559,500.00 to $50,432,956.25 - Financing: Wastewater Construction Fund ($954,423.56) and Wastewater Capital Improvement F Fund ($919,032.69)
Body
BACKGROUND
The City of Dallas owns and operates two wastewater treatment plants with a combined treatment capacity of 280 million gallons per day. Central Wastewater Treatment Plant (CWWTP) is the largest of the two plants, located just south of downtown. The treatment facility is divided into two plants, the Dallas Plant and the White Rock Plant.
On May 10, 2023, the City Council authorized a construction services contract with Bar Constructors, Inc. for headworks and primary clarifier improvements at the CWWTP. Primary Clarifiers A and B were originally constructed in the 1930’s and 1940’s and were experiencing severe deterioration of the concrete structure and associated equipment due to corrosion. The proposed improvements are addressing deteriorated infrastructure and increasing the capacity of the Dallas Plant Primary Clarifiers by 20 million gallons per day.
Sulphur Dioxide is part of an essential chemical system used to limit residual disinfectants from treated wastewater effluent to meet TCEQ discharge permit requirements and protect biology in the Trinity River. The Sulfur Dioxide system must be in continuous operation to maintain permit compliance. During the construction of project improvements, various components of the Sulphur Dioxide system were determined to be in poor condition and beyond the capabilities and resources of in-house staff to address while maintaining safe operation of the plant.
This action will authorize an increase to the construction services contract with BAR Constructors, Inc. to complete necessary improvements to the existing Sulfur Dioxide system at the CWWTP. The work includes demolition, installation of a temporary sulfur dioxide evaporator system, and the full replacement of the evaporators and associated piping system. Due to the critical nature of the work, complicated sequencing, and urgent need, Dallas Water Utilities engaged the engineer and contractor to replace the major components of the Sulphur Dioxide system. The contractor has provided an acceptable proposal to complete the urgent work and is familiar with the plant and its complex chemical systems.
ESTIMATED SCHEDULE OF PROJECT
Begin Construction October 2025
Complete Construction April 2026
PRIOR ACTION/REVIEW (COUNCIL, BOARDS, COMMISSIONS)
On May 10, 2023, the City Council authorized a construction services contract with BAR Constructors, Inc., for headworks and primary clarifiers improvements at the Central Wastewater Treatment Plant, by Resolution No. 23-0636.
FISCAL INFORMATION
|
Fund |
FY 2025 |
FY 2026 |
Future Years |
|
Wastewater Construction Fund
|
$954,423.56
|
$0.00 |
$0.00 |
|
Wastewater Capital Improvement F Fund |
$919,032.69
|
$0.00 |
$0.00 |
|
Total |
$1,873,456.25 |
$0.00 |
$0.00 |
Construction $48,559,500.00
Change Order No. 1 (this action) $ 1,873,456.25
Total $50,432,956.25
LOCAL PARTICIPATION
|
Prime |
Status |
Workforce % |
|
Bar Contractors, Inc |
Local |
38.79% |
OWNER/EXECUTIVE
BAR Constructors, Inc.
Isidro Arrambide, Jr., President
MAP
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