Lockout/Tagout: A procedure for placing a lock/tag on the energy isolating device to indicate
that the process system or equipment should not be operated.
Major Spill: The uncontrolled release of a hazardous substance into the environment to such a
degree that operations personnel can not control or contain the spill, and that requires
mobilization of emergency response personnel.
Onsite Essential Personnel: Those required personnel, available on the site, who by virtue of
their position, responsibilities, and/or expertise, are considered essential to the overall safe
operation of the site.
Oxygen Deficient Atmosphere: An atmosphere containing less than 19.5% oxygen by volume.
Oxygen Enriched Atmosphere: An atmosphere containing more than 23.5% oxygen by volume.
Permissible Exposure Limit (PEL): The employee's permitted exposure to any material listed
in Table Z-1, Z-2, or Z-3 of OSHA Regulations found at 29 CFR 1910.1000, Air Contaminants.
Personal Protective Equipment (PPE): Clothing and equipment used to shield or isolate
individuals from the chemical, physical, and biological hazards that may be encountered at a
hazardous waste site. PPE should protect the respiratory system, skin, eyes, face, hands, feet,
head, body, and hearing. PPE may also stand for personal protective clothing and equipment.
Physical Controls: Physical barriers put into place, which limit personnel exposure to hazards.
Physical Hazards: Those work-related sources of actual or potential danger (e.g., machinery,
trip and fall, hoisting and rigging, shoring and trenching) to which employees may be exposed.
Project: A unique major effort within a program which has firmly scheduled beginning,
intermediate, and ending date milestones; prescribed performance requirements; prescribed costs;
and close management, planning, and control. A project is a basic building block within a
program which is individually planned, approved, and managed. A project is not constrained to
any specific element of the budget structure (e.g., operating expense or plant and capital
Project Manager: The individual who has authority to direct all site activities. The project
manager has authority to direct site response and assures overall management of projects.
Qualified Person: A person who, by reason of training, education and experience, is
knowledgeable in the operation to be performed and is competent to judge the hazards involved.