33. Where the depth of a trench or excavation exceeds 1.2 m (3.9 ft), no person shall:(1) deposit materials less than 1.2 m (3.9 ft) from the top of the trench or excavation walls;
(2) operate or park a vehicle or machine less than 3 m (9.8 ft) from the top of the trench or excavation walls, unless reinforced shoring has been provided.