Definitions

Central lead inventory. A bulk lead storage facility (Building 413 in the Research Yard) used for the collection and distribution of lead for the site.

High-efficiency particulate air (HEPA) filter. A filter capable of removing from the air at least 99.97 percent of dust, pollen, mold, bacteria and any airborne particles with a size of 0.3 micrometers or larger

Industrial hygiene survey. Workplace survey for hazardous materials and contaminants, often including air sampling. Conducted by the SLAC industrial hygienist (see Chapter 5, "Industrial Hygiene Program").

Lead. Metallic lead, all inorganic lead compounds, and organic lead soaps. Excluded from this definition are all other organic lead compounds.

Lead machining. All cutting, shaping, or finishing of lead materials using powered tools

Lead work. Tasks that involve exposure to lead, such as

• Handling/stacking lead bricks
• Machining lead shielding
• Using a soldering iron on lead and lead material
• Welding or torch soldering on lead material
• Handling lead wool
• Grinding, sanding, wire brushing, or other abrasion of lead-containing paint

Legacy lead. Generally lead shot or matting (also known as pencil lead, lead wool, and spaghetti lead) that has been used at SLAC as radiation shielding in openings that are too small to place a piece of solid lead

Medical surveillance. Generally, a formal regime for monitoring the medical condition of workers. At SLAC the regime (29 CFR 1910.1025[j]) required by the OSHA lead standard

Permissible exposure limit (PEL). Generally, a limit for personal exposure to a substance. At SLAC the maximum concentration of lead in workplace air an employee can be exposed to in an eight-hour day, as set forth in the OSHA lead standard (29 CFR 1910.1025).