Provisions made within any planned development for open space areas shall be reviewed, found adequate, and approved by the Planning Board. In its review, the Planning Board shall investigate the size of the parcel(s) devoted to open space, their location in relation to the project, the topography, the uses contemplated upon such open space, configurations of the parcels under consideration, facilities and improvements to be provided, the provisions made for maintenance and access to said parcels or facilities as applicable, traffic flows to and around said parcels, the ecological impacts of their placement, development and use, and the staging or timing of the open space relative to the staging of the development of the project, if such staging is proposed.