American Fork City recently completed a trenchless pipeline and manhole project to rehabilitate more than 6,100 linear feet of 10- to 18-inch sewer pipe, 22 manholes, and 22 lateral connections. The City had been experiencing extensive infiltration problems, particularly during spring runoff, and had to allocate resources from a limited budget and man hours to monitor the sewer system.
Serving as the engineer consultant, Horrocks Engineers worked closely with the City, taking a proactive approach by implementing ultraviolet (UV) cured-in-place (CIPP) pipe lining due to its superior performance in wet applications where infiltration is a significant concern.
The City monitored the groundwater infiltration in the project area before and after completion and began to notice significant reductions in flow, which were directly attributed to the rehabilitation work. In fact, the measured flow reductions were better than expected, indicating that the rehabilitation strategy created by Horrocks Engineers and employed by the City was working.
“We estimate that the rehabilitation project eliminated approximately 100 gallons per minute of groundwater infiltration,” said Brad Conder, project manager for Horrocks Engineers. “Based on measured savings in wastewater treatment costs, it is anticipated that the project will pay for itself within three years. Considering that the products utilized for the rehabilitation project have an anticipated design life of 50 years, the return on investment is extremely favorable.”
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