D-9 - Drilling, Blasting and Oil Field Work Contractor

California Code of Regulations
Title 16, Division 8, Article 3. Classifications

A drilling contractor does core and post hole drilling, horizontal drilling (no piping) and drilling for placement of charges and performing blasting work; performs drilling for site dewatering, oil well drilling and other oil field related specialty work. (DOES NOT INCLUDE WATER WELL DRILLING)