planning, design, investigation, construction, erection, installation, completion testing and commissioning in all respect of entire units of arsenic cum iron removcal plant ( airp ) of different capacities capable of removing arsenic & iron present in ground water in different concentration to acceptable limit asper latest bis code manual on basis of departmental process drawing ( modified sujapur sadipur ) along with 5 ( five ) years operation & maintenance after succesful completion of3 ( three ) months trial run of augmentation of bali zone-iii ground water supply scheme in nawda block, , under berhampore division-i, p.h.e dte ( capacity-57.00 cum / hr. )