Heavy equipment over one ton, shall only be operated (including loading and unloading of equipment onto trailers) on site between the hours of 7:00 AM and 9:00 PM, prevailing time, weekdays and between the hours of 9:00 AM and 9:00 PM, prevailing time Saturdays and Sundays. Further, where within 1,500 feet of a school, library, park, day care, group home for disabled persons, nursing home or retirement community, the Planning Board shall impose further restrictions to ensure that such facilities are not unreasonably impacted by noise.