Philip Greisen Courses Professional Education Courses OSHA 3015: Excavation, Trenching and Soil Mechanics (OTI-3015P) OSHA 500: Trainer Course in Occupational Safety and Health Standards for Construction Industry (OTI-0500P) OSHA 510: Occupational Safety and Health Standards for Construction Industry (OTI-0510P) Scaffolding Safety (EST-7000P)