General Content Layout
In general, retaining wall layouts include the following information.
- Plan View. Include the following in the plan view:
- Beginning and ending wall points by station, offset, and roadway alignment
- Additional points as necessary to describe the relationship of wall alignment to roadway alignment(s)
- Indication of which side is the face of the wall
- Horizontal curve information if applicable for wall alignment
- Location of soil borings (Include boring name, station, offset, and top-of-hole elevation.)
- Signing, lighting, etc., mounted on or passing through wall (Designate and locate the sheets that contain information for these elements.)
- Surface and subsurface drainage structures or utilities that could affect or be affected by wall construction (Designate and locate the sheets that contain information on the structure or utilities.)
- Limits of temporary special shoring
- Elevation view. Include the following in the elevation view:
- Existing ground line along wall alignment
- Proposed finished grade line at face of wall
- Bottom of wall for payment
- Top of retaining wall grade line (Does not include the top of rail.)
- Soil boring information where possible, shown at the correct elevation and scale
- Designation for “Back Face of Wall” when back of wall is shown
- Panel numbers when applicable
- Drainage structures and features including slope at flowline, sizing, and maintenance recommendations within contract notes
- Utilities, signing, lighting, etc., as noted above
- Estimated quantity table. Include the estimated quantity table for each retaining wall type. Refer to a specific wall type for list of bid codes. Include the following in the estimated quantity table:
- Area of retaining wall
- Linear footage of railing on wall
- Miscellaneous quantities associated with wall (riprap, etc.)
- Typical section. A typical section should contain the following information:
- Cross section showing the relationship of the wall to the roadway
- Control point for horizontal and vertical alignment, typically shown at the top outermost corner of the wall
- Indication of maximum slope on top of and in front of wall
- Location of proposed finished grade
- Railing type, flume, mow strip, etc., if applicable
- Distance from back of wall panel to face of abutment cap, if applicable
- General notes. Include the following in the general notes:
- A note stating the required wall embedment depth if the specified embedment is greater than 1 ft. for slopes up to 4:1 in front of wall or 2 ft. for slopes in front of wall that are steeper than 4:1, as well as a note stating that the wall is measured between top of wall and "X" ft. below finished grade
- Reference to all applicable standard sheets for pertinent information
- Other pertinent information regarding wall design and construction
- Foundation design criteria (nominal bearing resistance, resistance factor and others)