The Designer shall consult with the Regional Geotechnical Engineer (RGE) as early as possible in the design phase to ensure adequate subsurface explorations are progressed to verify the feasibility of installing the soil nail wall system. Subsurface explorations must also provide enough information to define the engineering characteristics of the soil for design purposes. When considering the use of a soil nail wall system, it is recommended that the Designer contact the RGE for the determination of the appropriate subsurface exploration locations and subsequent analysis of the soil for its suitability for soil nailing. The Designer and the RGE shall also discuss the groundwater elevation and its effect on the proposed soil nail wall system and the anticipated construction sequencing with regard to the work zone traffic control to determine if additional subsurface explorations are required.