4.4.2 Additional Survey and Subsurface Utility Engineering Needs
Additional survey and subsurface utility engineering (SUE) investigations may be needed to obtain more specific field data once the recommended alternative is selected and the design elements have been optimized.
4.4.2.1 Survey
Additional survey may be needed to tie-in project-specific details including:
- Blank spots from previous LiDAR surveys;
- Existing above ground utilities;
- Existing bridge details;
- Existing drainage structure details (culverts, manholes, etc.);
- Existing driveway details;
- Existing ROW limits;
- Existing signals/pushbuttons, curb ramps, and sidewalk;
- Hydrographic survey for drainage design;
- Location of proposed geotechnical boreholes; and
- Location of wetlands.
4.4.2.2 SUE
Additional subsurface utility investigations may be needed to determine location and depth of existing underground utilities. The level of SUE investigation needed depends on the potential for utility conflicts. See
for more discussion on SUE.