STRATEGIC PRIORITY: Mobility Solutions, Infrastructure, and Sustainability
AGENDA DATE: March 25, 2020
COUNCIL DISTRICT(S): 3, 8
DEPARTMENT: Water Utilities Department
EXECUTIVE: Majed Al-Ghafry
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SUBJECT
Title
Authorize an increase in the construction services contract with John Burns Construction Company of Texas, Inc. for additional work at two locations associated with the relocation of a 36-inch water main at the Dallas Executive Airport (list attached to the Agenda Information Sheet) - Not to exceed $1,163,933.00, from $5,499,773.00 to $6,663,706.00 - Financing: Water Capital Improvement E Fund ($1,106,570.60) and Aviation Construction Fund ($57,362.40)
Body
BACKGROUND
On May 9, 2018, City Council authorized a contract for the installation of water and wastewater mains at 11 locations to John Burns Construction Company of Texas, Inc. The project includes the replacement and rehabilitation of approximately 18,690 feet of water and wastewater mains including the relocation of approximately 3,310 feet of water main at Dallas Executive Airport. The existing mains targeted for replacement were contributing to an increase in maintenance costs as well as service interruptions, and the new mains will improve capacity and reduce maintenance costs.
This action will authorize Change Order No. 1 to the construction services contract for additional work identified during construction. During the construction of a 36-inch water main at the Dallas Executive Airport, field investigation revealed that a 48-inch valve near the Camp Wisdom Pump Station was broken. Since there are no other valves available to isolate the flow, the 36-inch main could not be connected to the 48-inch water main as designed. Further, shutting down the 48-inch water main to replace the broken valve would cause interruption of water service to a hospital.
A modification of the design was necessary to complete the pipeline ...
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