The soil nail provides a resisting force against slope failures. The excavation is accomplished in three to six foot increments. After each
depth is excavated, reinforcing rods and mesh are placed into and against the face of the slope; the soil nails are located and driven in
place. Then the entire face is sprayed with concrete gunite and the nails are grouted, cured, and the tested to confirm the design strength
requirement has been met. This procedure continues along the perimeter of the excavation and is repeated until the excavation is complete.

Soil nailing is ideal for tight spaces or areas where existing utilities are not in conflict with the soil nails. It eliminates time and
expense of placing steel piles; wall height is not restrictive, and these systems typically can be left in place. The soil nailing system
also eliminates the need for internal bracing that may not be compatible with the construction. It is not recommended, however, in high water
table areas where low shear strength soil may require high soil nail density or where soil has high sand or clay content since compaction is
critical for successful nailing.The Project Team, using information from the Geotechnical Engineer, can make the best earth retention choice for each project. The project
benefits when the Construction Manager has experience with all systems.