(1) In computing any period of time prescribed or allowed by any applicable statute or rule, RCW 1.12.040 shall apply.

(2) When the period of time prescribed or allowed is less than seven days, intermediate Saturdays, Sundays, and legal holidays shall be excluded in the computation.

(3) Whenever a person has the right to request an administrative review or interview within a prescribed period after notice is provided by the department under Title 46 RCW or 308 WAC, such notice is deemed to be given on the third day after the notice is deposited into the state mailing service or immediately when the notice is sent via electronic mail.

(4) A request for an administrative review or interview, under Title 46 RCW or 308 WAC, is deemed received by the department on the third day after the request is postmarked. A request for an administrative review or interview, under Title 46 RCW or 308 WAC, sent via electronic mail is deemed received by the department on the date filed.