The table above shows factor of safety (FoS) of the waste dump area. It can be concluded from the table that flooding occurs at 601.00 msl, factor of safety is 1.38 and factor of safety decrease when water level increase. However, to protect slope stability of the waste dump area in long-term. Must divert water from this area. It will be make the ground soft which will affect to slope stability in the future. Consequently, geotechnical team recommend as follows;
1. Fill material onto flooding area to divert water out off waste dump area
2. Slope stability of the waste dump area had been monitored by geotechnical team