…. Rancho Palos Verdes officials are hoping to slow the land movement with the help of five new de-watering wells they’re in the process of installing at the deepest level yet. The wells aim to relieve the pressure from groundwater on the newly discovered, deeper slip plane, or the surface driving the landslide failure. City officials have acknowledged, however, that they don’t know how effective the pilot project will be. Rolling Hills officials, meanwhile, have been scrambling to respond to the crisis while also attempting to distinguish the city’s “notably different” land movement from the experience in Rancho Palos Verdes. … It’s undisputed that the landslide activity is caused by increasing groundwater, which officials have linked to the back-to-back years of heavy rainfall in Southern California. Many residents also worry it’s been exacerbated by poor drainage and repeated water main breaks.