Four ponds maintained by the City of Austin in the Sendera and Circle C neighborhoods were in need of repair. These ponds were designed with clay liners that had proved inadequate. Their deterioration could lead to polluted stormwater entering the aquifer that feeds Barton Springs. This project replaced the clay liners with modern geomembrane liners. It also improved berms and irrigation systems around the ponds. The pond edges have been revegetated with native wetland plants.