All records or material containing proprietary or trade secret information submitted by a developer, owner, or manufacturer shall contain a cover sheet that displays in bold type, “DOCUMENT CONTAINS CONFIDENTIAL PROPRIETARY OR TRADE SECRET INFORMATION.” The developer, owner, or manufacturer shall clearly mark each instance of information which is, in their opinion, proprietary or trade secret information. However, as custodian of such information, there shall be a determination of whether such information is in fact proprietary or trade secret information.