Operation and Maintenance of distribution system and rising main pipe line ( CI/ DI/ UPVC/ HDPE ) and Operation and Maintenance of Arsenic cum Iron Removal Plant of Modified Sujapur sadipur Model ( AIRP Capacity- 139. 31 cub. m/ Hr ) AND ( AIRP Capacity- 86. 69 cub. m/ Hr ) and allied works of Andulberiya and Charkamnagar ground Water Supply Scheme under Berhampore Division- I, P. H. E. Dte. Period: for One Ye