partial gravity system with pressure filter and pressurized upflow polishing unitname of work: 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 as per 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 katalia ground water supply scheme in berhampore block, under berhampore division-i, p.h.e dte. ( capacity-36 cum / hr. )