An operator shall:
1. Post duties. Post in conspicuous places at the ice-skating rink the duties of skaters and inherent dangers of skaters as provided in sections 624 and 625;
2. Maintain equipment. Maintain ice-skating equipment and ice-skating surfaces in a reasonably safe condition; and
3. Stability and legibility of notices. Maintain the stability and legibility of all required signs, symbols and posted notices.