(1) Issuance. Subpoenas may be issued by any member of the board, the presiding officer assigned to the case or an attorney of record, as provided in the Administrative Procedure Act. Each subpoena shall be subscribed with the signature of the issuing person. Parties desiring subpoenas to be signed by the presiding officer or a board member shall make a showing of general relevance and reasonable scope of the testimony or evidence sought, shall prepare the subpoenas for issuance, shall send them to the board's office for signature at least ten days before the hearing, and, upon return, shall make arrangements for service.

(2) Form. Every subpoena shall name the pollution control hearings board and the title of the proceedings, and shall command the person to whom it is directed to attend and give testimony or produce designated books, documents, or things under that person's control at a specified time and place.

(3) Service. Service of subpoenas to a witness who is not a party to the case shall be made by personally serving a copy of the subpoena to such person, in accordance with civil rule 45, and tendering on demand, where entitled to make such a demand, the fees for one day's attendance and the mileage allowed by law. All costs shall be paid by the party seeking the attendance of the witness.

(4) Proof of service. The person serving the subpoena shall make proof of service by filing the subpoena and the required return, affidavit or acknowledgment of service with the board or presiding officer of the case. Failure to make proof of service does not affect the validity of the service.

(5) Quashing. Upon motion made promptly (at or before the time specified in the subpoena for compliance) by the person subpoenaed and upon notice to the party for whom the subpoena was issued, the presiding officer may:

(a) Quash; or

(b) Modify the subpoena if it is unreasonable or requires evidence not relevant to any matter in issue; or

(c) Condition denial of the motion upon just and reasonable conditions.

(6) Geographical scope. Attendance of witnesses and production of evidence may be required from any place in the state of Washington, at any designated place of hearing.