California Code, Public Resources Code - PRC § 8815.1

When CCS83 coordinates are shown on any map, corner record, or other document, the map, corner record, or document shall state the datum realization tag in parentheses and epoch date, in a decimal year format to two decimal places, that is the basis of the coordinate values shown.  The datum realization tag and epoch date shall be shown on the map, corner record, or other document by an appropriate note on the map, corner record, or document or by adding a suffix in parentheses after CCS83 that states the epoch; for example, “CCS83 (2011) epoch 2010.00,” “CCS83 (NSRS) epoch 2007.00,” and so forth.