The Department shall have the power to require remedial education, suspend, revoke, or deny renewal of the certificate of any supervisor, assessor or appraiser who is found to be in violation of the regulations established by the Department pursuant to § 58.1-3258.1. The Department may suspend, revoke, or deny renewal of an existing certificate, or refuse to issue a certificate, to any supervisor, assessor or appraiser who is shown to have a substantial identity of interest with a supervisor, assessor or appraiser whose certificate has been revoked or not renewed by the Department.