Certificates shall show the full name of the certified soil scientist, apprentice soil scientist, certified wetland scientist, or apprentice wetland scientist and have a serial number. Each certified soil scientist or certified wetland scientist shall obtain a seal of the design authorized by the board bearing the name of the certified individual, the legend “Certified Soil Scientist” or “Certified Wetland Scientist,” as appropriate, and a place for the certified individual’s signature. Plans and reports prepared by a certified individual shall be stamped with the seal and signed by the certified individual during the life of the certificate.