PILLAR: Sustainable
AGENDA DATE: May 27, 2026
COUNCIL DISTRICT(S): 2, 6
DEPARTMENT: Dallas Water Utilities Department
PRIORITY: Infrastructure
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SUBJECT
Title
Authorize Supplemental Agreement No. 1 to the professional services contract with Hazen and Sawyer, P.C. to provide additional engineering services for the Harry Hines and Webb Chapel Extension Wastewater Interceptors Project (list attached to Agenda Information Sheet) - Not to exceed $2,045,015.00, from $3,264,998.00 to $5,310,013.00 - Financing: Wastewater Construction Fund
*In alignment with Water and Wastewater Capital Improvement Program.
Body
BACKGROUND
On September 12, 2018, the City Council authorized a professional services contract with Hazen and Sawyer, P.C. to provide engineering services for the design, replacement, and rehabilitation of water and wastewater mains at 5 locations. One of those locations included the replacement and rehabilitation of the existing Brook Hollow Wastewater Interceptor System that is in poor structural condition and needs additional capacity to support ongoing and future development. During design, the Dallas Water Utilities Department (DWU) completed the Comprehensive Wastewater Collection System Master Plan and recommended a larger interceptor to handle projected future flows. It was determined that the current corridor for the Brook Hollow Interceptor did not have sufficient depth to accommodate a larger interceptor as proposed in the Master Plan. Therefore, a new wastewater interceptor was proposed at Harry Hines Boulevard to accommodate the increased flows and provide additional capacity. The proposed interceptor was divided into segments, including the Harry Hines Interceptor Phases 1 through 4 and Webb Chapel Extension Interceptor.
The proposed improvements to the Webb Chapel Extension Interceptor include replacement of the pipeline and modification of two existing junction boxes into ...
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