Annual Running Contract for Operation and Maintenance of Automated PLC controlled comprehensive HydroPneumatic Wet and Dry vacuum based Ash Handling System including Ash silos and Ash water recovery system of 2x600 MW Units, RGTPP, Khedar, Hisar Annual Running Contract for Operation and Maintenance of Automated PLC controlled comprehensive HydroPneumatic Wet and Dry vacuum based Ash Handling System including Ash silos and Ash water recovery system of 2x600 MW Units, RGTPP, Khedar, Hisar