Page 119 - N. Richland Hills Capital Budget

Utility Capital Projects
Department Project Title Project Number
Public Works Big Fossil 24" Interceptor UT2004
Project Description
This project is for the replacement of the 24 inch wastewater main running from the Fort Worth meter station to just south of Holland
Dr. This project will include replacement of roughly 2400 linear feet of reinforced concrete pipe, replacement of seven manholes, and
will require bypass pumping during construction.

Project Justification
The pipe material used for this pipeline was reinforced concrete pipe. Due to three major collapses in the last three years, with the
two that most recently occured staff was able to inspect this section of pipeline. Staff was able to verify that the pipeline has
significant deterioration due to hydrogen sulfide gas (H2S). H2S gas eats away at the portion of pipe that does not carry the
wastewater flow (roughly 50% of the top portion of the pipe). With the gases attacking the top portion of pipe, this creates concern
with this portion of pipe carrying the load bearing of earth. Once the pipe collapses, this causes a blockage in the pipeline resulting
in a sanitary sewer overflow. The typical thickness of reinforced concrete pipe is between 2 and 3 inches. Staff was able to locate
areas in the pipeline that had a thickness as low as a quarter of an inch. This is not just at isolated areas, this corrosion is
throughout the pipeline. With the installation of PVC pipe, the H2S gases will not corrode the new pipeline therefore creating a
pipeline that should have a life expectance of 100 years or greater.
Funding Source: Certificates of Obligation.

Project Schedule Beginning Date Ending Date History Fiscal Year Amount
Professional Services Proposed 2019-20 $1,255,000
Engineering/Design 10/2019 09/2020 Total $1,255,000
Land/ROW Acquisition
Construction 06/2020 11/2021
Other
Total Schedule 10/2019 11/2021
Sources of Funds To Date 2020-21 Budget 2021-22 Estimate 2022-Completion Total Funding
General Obligation Bonds
Certificates of Obligation 1,255,000 0 0 0 $1,255,000
Federal/State Grants
Reserves
Sales Tax
Other
Total Funding $1,255,000 $0 $0 $0 $1,255,000
Project Costs To Date 2020-21 Budget 2021-22 Estimate 2022-Completion Total Cost
Professional Services 251,000 0 0 0 $251,000
Engineering/Design
Land/ROW Acquisition
Construction 1,004,000 0 0 0 $1,004,000
Other
Total Costs $1,255,000 $0 $0 $0 $1,255,000
Operating Impact
No operating impact is anticipated.

Fiscal Year 2020-21 2021-22 2022-23 2023-24 2024-25 Total Impact
Amount $0 $0 $0 $0 $0 $0
Total Operating Impact $0 $0 $0 $0 $0 $0

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