(1) The written petition for review must be filed by using the department's online services or by mailing it to the Commissioner's Review Office, Employment Security Department, Post Office Box 9555, Olympia, WA 98507-9555, within thirty days of the date of mailing or delivery of the decision of the office of administrative hearings, whichever is earlier.

(2) Any written argument in support of the petition for review must be attached to the petition for review and be filed at the same time. The commissioner's review office will acknowledge receipt of the petition for review by assigning a review number to the case, entering the review number on the face of the petition for review, and setting forth the acknowledgment date on the petition for review. The commissioner's review office will also send copies of the acknowledged petition for review and attached argument in support thereof to the petitioning party, nonpetitioning party, and their representatives of record, if any.

(3) Any reply to the petition for review and any argument in support thereof by the nonpetitioning party must be filed by using the department's online services or by mailing it to the Commissioner's Review Office, Employment Security Department, Post Office Box 9555, Olympia, WA 98507-9555. The reply must be received by the commissioner's review office within fifteen days of the date of the acknowledged petition for review. An informational copy must be mailed by the nonpetitioning party to all other parties of record and their representatives, if any.

(4) The petition for review and argument in support thereof, and the reply to the petition for review and argument in support thereof, must:

(a) Be captioned, and include the docket number of the decision of the office of administrative hearings, and be signed by the party submitting it or by a designated representative of that party; and

(b) Be legible, reproducible, and five pages or less.

(5) Arrangements for representation and requests for copies of the hearing record and exhibits will not extend the period for the filing of a petition for review, argument in support thereof, or a reply to the petition for review.

(6) Any argument in support of the petition for review or in reply thereto not submitted in accordance with the provisions of this regulation is not considered in the disposition of the case unless it is determined that the failure to comply with these provisions was beyond the reasonable control of the individual seeking relief.