PILLAR: Sustainable
AGENDA DATE: October 8, 2025
COUNCIL DISTRICT(S): 6, 8, Outside
DEPARTMENT: Dallas Water Utilities Department
PRIORITY: N/A
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SUBJECT
Title
Authorize Supplemental Agreement No. 1 to the professional services contract with Halff Associates, Inc. to provide additional engineering services necessary for water and wastewater main installations at 21 locations (list attached to Agenda Information Sheet) - Not to exceed $883,900.00, from $1,281,170.00 to $2,165,070.00 - Financing: Wastewater Capital Improvement G Fund ($806,633.00) and Water Construction Fund ($77,267.00)
Body
BACKGROUND
On February 25, 2004, the City Council authorized a professional services contract with Halff Associates, Inc., to provide engineering services for the replacement and rehabilitation of water and wastewater mains in various locations. The original scope of the contract consisted of survey and design for approximately 80,500 feet of 8-inch through 21-inch diameter water and wastewater main replacements and rehabilitation in various locations, primarily within the Hickory Creek and Pleasant Grove sewer basins. Project locations were divided into two phases for design and construction. Phase 1 design and construction are complete. Bidding and construction of Phase 2 was delayed due to extended time required for necessary easement acquisitions, subsequent discussion of construction logistics with property owners from whom Dallas Water Utilities Department (DWU) has acquired easements, and to review DWU 2020 Comprehensive Wastewater Collection System Assessment Update (CWWCSAU) and incorporate subsequent design modifications to accommodate flow capacity changes since the original design. Phase 2 was subdivided into Phase 2A, which is currently under construction, and Phase 2B, which requires further evaluation and additional design efforts.
Additional easement acquisition and construction logistic...
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