tender for design, construction, supply, testing, commissioning of water supply schemes (balance work left by previous contractor) with electric driven pumps and iron removal treatment plant having technology (adsorption/ nano technology) of csir or certified by csir or any other technology endorsed/ approved by goi in the iron affected habitations/ wards of districts- purnea of bihar on turn-key basis with 3 months trial run after commissioning and comprehensive operation and maintenance of 60 months after successful completion of trial run period under mukhyamantri nishchay (quality affected) yojna on turn key basis