Reducing of Pb2+ and Cd2+ from Well Water with RO Plants

Our goal is to decrease the concentration of Pb2+ and Cd2+ from well water with RO plants. Feed water analysis for Cd2+ is 0.02 ppm and for Pb2+ is 0.1 ppm. Can the concentration of these heavy metals be reduced to below 0.01 and 0.003 ppm for Pb2+ and Cd2+, respectively? Should the RO system be designed in a specific way? What is a cost-effective method, if it is necessary, for pre-treatment?