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 Gobordanga Model ( AIRP Capacity- 11. 00 cub. m/ Hr ) and allied works of Diar shyampur ZONE- I and Diar shyampur ZONE- II ground Water Supply Scheme under Berhampore Division- I, P. H. E. Dte. Period: for One Year.