All geophysical plans, specifications, reports, or documents shall be prepared by a professional geophysicist, registered certified specialty geophysicist, professional geologist, registered certified specialty geologist, or by a subordinate employee under his or her direction. In addition, they shall be signed by the professional geophysicist, registered certified specialty geophysicist, professional geologist, or registered certified specialty geologist, or stamped with his or her seal, either of which shall indicate his or her responsibility for them.
Source:
Section 7835.1, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=7835.1..