
Environmental Remediation Drilling
Safety Guidelines
Page 13 of 132
Term Definition
Subsurface Activity
Activity carried out by mechanical equipment resulting in an intended
disturbance of the earth.
Tenders
A rope attached to equipment hung on a boom that is used to guide the direction
of movement.
Utility Mark-outs
The surface marking of underground utilities and structures. There are public
services (one call centers) that will mark out underground utilities on public right-
of-ways and private locaters that will mark out utilities on private property. A
nation-wide one call center director maybe found at
www.undergroundfocus.com/
Utility or Structure
Any underground object that could be damaged or cause harm if encountered
during subsurface activities.
Water Swivels
A water-tight rotating connection located on top of the drill stem that connects to
a hose delivering drilling mud, water or other drilling fluids.
Well Head
Equipment installed at the surface of the borehole when a casing is installed in
the borehole. A well head may include such equipment as the casing head and
tubing head.
Wire Rope Hoist
or Draw Works
An arrangement of pulleys and wire rope used for lifting heavy objects, a winch
or similar device.
A typical rig is presented below with major parts labeled
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