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 of existing scheme ( AIRP Capacity- 90. 50 cub. m/ Hr ) and Arsenic cum Iron Removal Plant of Gobordanga Model ( AIRP Capacity- 6. 57 cub. m/ Hr ) and allied works of Dakshin Gopalpur and Ramchandrapur ground W