Loveland Selenium Flow Monitoring & Sampling

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Ayres has provided flow monitoring and sampling services, starting in 2016, to locate sources of selenium entering the City of Loveland’s wastewater collection system. In 2017 the project team identified Basin 46 as contributing the highest load of selenium to the system. In 2018, Ayres is attempting to verify high selenium loadings in Basins 43, 44, and 47. The team also is seeking to document changes in selenium loading due to system repairs and maintenance such as point repairs, cured-in-place pipe (CIPP) lining, and manhole lining. Ayres uses the City’s eleven automatic samplers and 19 flow monitors as necessary. Ayres also collects grab samples in strategic locations during the 1 to 5 a.m. low-flow period to detect areas in the collection system with high selenium concentrations.

Project Information

Client's Name

City of Loveland


Loveland, CO

Primary Service

General Civil / Municipal Engineering

Client Type