Consultancy Services of Authoritys Engineer for Construction of 6- lane Greenfield corridor from Ramnagar to Kacchi Dargah NH- 119D ( from Km 109 700 to Km 122 300 ) including widening of the existing NH- 31 ( from Km 196 700 to Km 198 600 ) as part of the Amas- Darbhanga highway in the state of Bihar on EPC Mode