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During a routine inspection, company staff identified several sinkholes following the path of the ash pond outfall pipe. Inspection of the reinforced concrete pipe revealed the pipe joints had deteriorated, and the sinkholes were caused by infiltration. The station made the decision to use the HydraTite internal joints seals that are designed for the rehabilitation and restoration of declining pipe joints. Due to the short window for installation, the HydraTite seals were used to eliminate infiltration. Mindful of the environmental issues associated with the ash pond, HydraTech closely monitored and controlled the ash pond level during the installation of the HydraTite seals, minimizing flow…