Improvements To Be Installed. The applicant shall install or guarantee the installation of the following improvements: grading, streets, gutters, curbs and sidewalks; trees, culverts, storm sewers; drainage structures; utilities (electric, telephone), water mains or other means of water supply, sanitary sewers or other means of sewage disposal and all appurtenances to such facilities properly connected with approved systems of water supply and sewerage, as the case may be, and adequate to handle all present and probable future development; fire hydrants; and monuments.