The series of storms in late December 2010 through mid-January 2011 caused flooding at the Waimanalo Gulch Sanitary Landfill that damaged the liner system in Cell E6. This allowed waste materials and stormwater to be released. In response, a removal action was undertaken to pump liquid from the landfill, repair the liner, and prevent further releases. The action involved multiple organizations and cost $18 million. It effectively stabilized the site and protected human health and the environment.