California Code, Public Resources Code - PRC § 71066

The secretary shall prescribe one or more techniques by which a report may be signed electronically by a person who would otherwise place a written signature on a paper version of the report.  The prescribed electronic signature shall be binding on all persons and for all purposes under the law as if the signature had been made in ink on the equivalent paper document.  The secretary may also prescribe a paper form for signature and certification of a report submitted in the prescribed file format on tangible magnetic media, including, but not limited to, floppy disks or magnetic tape.