Explosives used for developing or reconditioning any water well must be used under the direct supervision of an individual licensed under chapter 70.74 RCW.
Wash. Admin. Code § 173-160-361
Statutory Authority: Chapter 18.104 RCW and RCW 43.21A.080. 98-08-032 (Order 97-08), § 173-160-361, filed 3/23/98, effective 4/23/98.