bids are invited for flushing / cleaning of ugr at sarai kale khan bps. - flushing / cleaning of ugr at sarai kale khan bps. cleaning of under ground sump, over head r.c.c. tank ( independentstaging) including disposal of slit and rubbish, all as per direction ofengineer-in-charge. the cleaning shall consist following operations:-(i)tank shall be emptied of water by pumping & bottom shall becleaned of silt and other deposits.(ii) entire surface area of the sump shall then scrubbed thoroughlywith wire brush etc. and pressure washed with water.(iii) chlorination of rcc internal surface by liquid chlorine.(iv) the treated surface shall be dried using air jetting and all looseparticles shall be removal from the surface.(v) finally the surface shall be treated with ultraviolet radiation etc.as per direction of engineer-in-charge.(dsr(2021) item no-14.78 page no.303) total quantity : 1