The National Trench Safety Mobile App is designed with the modern contractor in mind. The app features productivity and compliance tools including. aily Jobsite Excavation Checklist-Manufacturers Tabulated Data-Product Weights, Depth Ratings and Reference Materials-OSHA Standard Materials-Sloping, Benching and Soil Classification Quick Reference-And more. With a nationwide branch network, National Trench Safety specializes in the rental and sale of trench and traffic safety products. NTS also provides comprehensive OSHA compliant training services as well as site specific engineering services for the trench and traffic safety industries.