Supply of Listed-I, Listed-II and Listed-III WCLs for Sanitation & Upkeepment & other Miscellaneous Services in Digboi Oil Field, Manabhum (AP), South Bank, Schools, Guest Houses, OIL Housing area, Bungalows, Conservancy tracks, deep drains, Offices of Duliajan, Zaloni Club, R&D building comoplex of OIL including collection, transportation and disposal of MSW under Medical Department, Duliajan for a period of 5 (Five) years