A drilling contractor performs work in the following areas:
- (1) exploratory core drilling and boring, for the purpose of gathering geotechnical data and ground water monitoring;
- (2) water well drilling, including the installation of well casings; or
- (3) horizontal drilling and tunneling for the purpose of soil stabilization, grouting, dewatering and drainage, mining, and the installation of underground cables and piping.
(Eff. 7/26/90, Register 115)