A slope collapse behind a Blissful Beach property on Sylvan Lake has raised concerns that other properties could be in danger. The landslide happened on June 23 and sent trees and tonnes of earth sliding down the steep embankment, tearing away part of a lengthy set of stairs to a lakeside dock. County environmental coordinator Jordan Nakonechney said it is believed June’s heavy rains saturated the land. Also, a garden hose was apparently left on…