The City of Mesquite was ready to take the next step after conducting some initial improvements related to its Sanitary Sewer Overflow (SSO) Initiative Plan and Agreement with the Texas Commission on Environmental Quality (TCEQ). Specifically, this next step involved consideration of infrastructure condition and criticality factors to provide better prioritization of sewer system pipe for rehabilitation and renewal.
Plummer used asset management principles to develop a risk based prioritization of future sewer system rehabilitation and replacement. A risk assessment of the system will not only consider the likelihood that a pipeline could fail but also the consequences of a failure in terms of levels of service and potential consequential damages. The risk based prioritization and system long term sustainability analyses will provide both near (5-year) and long term (50-year) investment forecasts for sewer system renewal.
Major activities of the project include:
- Review of existing data
- Determination of anticipated useful life, remaining useful life, and replacement cost for each collection system asset
- Preparation of a risk assessment
- Development of renewal forecasts
- Delivery of an Asset Management plan that documents the findings and provides the City with a prioritized list of assets for further investigation and possible renewal.
The cost of the study was minimized by Plummer’s use of existing information, and in certain cases use of surrogate data in order to minimize expensive field work. The goal is to capitalize on the existing information the City already has, and to set up a prioritize listing of sewer assets that are most likely in need of renewal. This step creates a path forward for the City, while pinpointing condition assessment activities to where they are needed, minimizing cost and maximizing benefit.