a. ground conditions and terrain b. the depth of the excavation pit c. weather conditions d. the load on the ground from surrounding buildings or structures, storage locations, work equipment and similar e. the location of excavated materials f. traffic conditions at the excavation site g. the location and use of work equipment and materials h. the need for shoring i. installations in the ground j. chemical and biological health hazards k. falling objects l. risk of falling m. ergonomic conditions n. the need for evacuation and escape routes.