Section 1502.23 - Filing and service of submissions(a) Submissions, including pleadings in a hearing, are to be filed with the Office of the Secretary. Two copies shall be filed. To determine compliance with filing deadlines in a hearing, a submission is considered filed on the day of filing with or mailing to the Office of the Secretary. When this part allows a response to a submission and prescribes a period of time for the filing of the response, an additional 3 days are allowed for the filing of the response if the submission is served by mail.(b) The person making a submission shall serve copies of it on the other participants.(c) Service is accomplished by mailing a submission to the address shown in the notice of participation or by personal delivery.(d) All submissions are to be accompanied by a certificate of service or by a statement that service is not required, stating the reason therefor.(e) No written submission or other portion of the administrative record may be held in confidence, except as provided in § 1502.3 .