tender for cleaning of oh tanks, ug sumps & supply lines and other connected items at af stn awantipur--m&l for cleaning and sterilisation of over head water tank of capacity 50000 gallon having two compartment each of 25000 gallon of height 20 mtr above gl and cleaning the tank as detailed below-(a) stage-1 mechanically dewatering in the first stage of mechanized dewatering of oht process the manhole and surroundings are cleaned of dirt, mud and algae after which the water below the foot valve level is pumped out using special de-watering equipment.(b) stage-11 sludge removal- in the second stage removal the sludge which has settled on the floor of the oht is sucked out using special sludge pumping equipments.(c) high pressure cleaning in the third stage, walls and ceiling of the oht are thoroughly cleaned using special high pressure jet cleaners which rid of the walls of! calcinations, algae and all contaminants which cling on the internal surface of the oht helping the microbiological contamination to grow.(d) stage iv- vacuum cleaning in the fourth stage remove the sludge by using industrial vacuum cleaner, remove the resultant contaminants making the oht absolutely speck-free.(e) stage -v anti-bacterial spray-in the fifth stage anti-bacterial treatment to walls ceiling are made totally sterile from bacterial attack using special anti bacterial agents.(f) stage -vi uv radiation- in the sixth stage of process sterilisation and disinfection is done by using uv radiation by a specially developed uv radiator which is used to kill any suspended or foating bacteria remaining oht.(g) stage vii painting- in the seventh stage provide two coat of epoxy drinking water paintco to the walls, ceiling and bottom of the oht,complete all as specified and as directed by engr-in-charge.note: contractor should write the date of cleaning and next date of cleaning in a bold letterm&l for cleaning and sterilisation of under groung/semi under ground water tank of capacity 30000 gallon having two compartment each of 15000 gallon, and cleaning the tank as detailed below.-(a) stage-1 mechanically dewatering in the first stage of mechanized dewatering of ug sump process the manhole and surroundings are cleaned of dirt, mud and algae after which the water below the foot valve level is pumped out using special de-watering equipment.(b) stage-11 sludge removal- in the second stage removal the sludge which has settled on the floor of the ug sump is sucked out using special sludge pumping equipments.(c) high pressure cleaning in the third stage, walls and ceiling of the ug sump are thoroughly cleaned using special high pressure jet cleaners which rid of the walls off calcinations, algae and all contaminants which cling on the internal surface of the ug sump helping the microbiological contamination to grow.