Wash. Admin. Code § 173-60-020
Statutory Authority: Chapter 70.107 RCW. 94-12-001 (Order 92-41), § 173-60-020, filed 5/18/94, effective 6/18/94; 83-15-046 (Order DE 82-42), § 173-60-020, filed 7/19/83; Order DE 77-1, § 173-60-020, filed 6/1/77; Order 74-32, § 173-60-020, filed 4/22/75, effective 9/1/75.