Specifications include, but are not limited to: 1. Mobilize to the work site. 2. Implement Erosion and Sediment Control Plan (ESCP) as required by Owner prior to beginning construction. 3. Drill minimum 30-inch diameter borehole and install 24-inch diameter mild steel surface casing from 3 feet above ground surface to depth determined by Engineer. The surface casing shall be installed into confining layer at a depth of approximately 45 feet below ground surface. Seal the annular space between the surface casing and borehole with cementbentonite grout, cement grout, or bentonite chips from ground surface to the bottom of the surface casing. 4. Install a temporary 8-inch or 10-inch casing centralized in the surface casing and then drill a nominal 8-inch diameter exploration borehole below surface casing to a depth of approximately 700 feet or depth determined by Engineer for geophysical logging purposes. 5. Conduct geophysical logging of the pilot borehole. 6. Abandon pilot borehole to depth determined by Engineer per Idaho Department of Water Resources (IDWR) requirements.
