Rehabilitation Of Existing Boreholes

Boreholes may collaps due to rusted casing or overburden ground flushing into the borehole. The rehabilitation method that we apply is to clear the borehole with an air percussion drill to its original depth and thereafter to install perforated upvc casing with graded silica gravel between the steel asing and the newly installed upvc casing. A plug is installed at the bottom of the upvc casing to prevent particals from entering the upvc sleeve.