STRATEGIC PRIORITY: Sustainable
AGENDA DATE: May 28, 2025
COUNCIL DISTRICT(S):|910|DEPARTMENT: Dallas Water Utilities Department
EXECUTIVE: Dev Rastogi
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SUBJECT
Title
Authorize Supplemental Agreement No. 2 to the professional services contract with Gresham Smith, for additional engineering services associated with the Lower East Bank Interceptor - Not to exceed $1,537,899.00, from $2,527,984.50 to $4,065,883.50 - Financing: Wastewater Capital Improvement G Fund
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BACKGROUND
On December 14, 2016, the City Council awarded a professional services contract to Gresham Smith for the engineering design and surveying of an estimated 36,138 feet of water and wastewater main replacements at 13 locations. One of those locations included the replacement and rehabilitation of the existing Lower East Bank wastewater interceptor system that is in poor structural condition and needs additional capacity to support ongoing and future development. The Lower East Bank Interceptor has been identified in master planning efforts as one of Dallas Water Utilities' Department (DWU) most critical pipeline improvement projects.
Following the completion of design and prior to the advertisement for construction bids, DWU completed an updated master plan that recommended an increase to the wastewater flows to be conveyed by the Lower East Bank Interceptor. The increased flows required the Lower East Bank Interceptor design to be modified before advertising for construction bids. On September 23, 2020, a construction contract was awarded and following award of the contract it was determined that the bottom of an existing pressure storm sewer conflicted with the proposed alignment of the interceptor. The existing pressure sewer has a bottom elevation different than what was originally anticipated based on the best available records and a portion of the interceptor design was modified to clear the conflict.
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