surveying, planning, designing, delivery, erection, construction, commissioning and completion in all respect of all civil, electrical and mechanical works like raw water intake, wtp, raw water rising main, clear water rising main ( cwr at wtp to different ohr sites ) , ohr, chlorine cum switch room, boundary wall etc. including all allied related and enabling works for surface water based piped water supply scheme for entire nabagram block, part of berhampore & murshidabad-jiaganj blocks of district murshidabad followed by 6 ( six ) months of trial run and subsequent operation & maintenance of 5 ( five ) years.