STRATEGIC PRIORITY: Transportation & Infrastructure
AGENDA DATE: November 9, 2022
COUNCIL DISTRICT(S):|910|DEPARTMENT: Water Utilities Department
EXECUTIVE: Kimberly Bizor Tolbert
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SUBJECT
Title
Authorize Supplemental Agreement No. 1 to the professional services contract with Gresham Smith to provide additional engineering services for the Lower East Bank Interceptor - Not to exceed $347,510.00, from $2,180,474.50 to $2,527,984.50 - Financing: Wastewater Capital Improvement F Fund
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BACKGROUND
On December 14, 2016, City Council awarded a professional services contract to Gresham Smith for engineering design services related to the replacement and rehabilitation of water and wastewater mains 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' (DWU) most critical pipeline improvement projects.
Design improvements for the Lower East Bank Interceptor were completed and the project was put on-hold until the necessary easements for the project could be acquired. 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...
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