The table above shows factor of safety (FoS) of the waste dump area. It can be concluded from the table that when occurs flooding at toe slope in water level of 601.00 msl factor of safety is 1.38 while factor of safety decrease when water level increase. However, to protect slope stability of the waste dump area in long-term. We should be perform divert water from this area. Because if you don't it. It will be make the soft ground which will affect to slope stability of this area in the future. Consequently, geotechnical team recommend as follows;
1. Fill material onto flood area to divert water out from waste dump area
2. Slope stability of the waste dump area had been monitored by geotechnical team