Let me provide a background for this request. 1000 and in other substance-specific health standards. I am writing to secure your official interpretation of an OSHA health standard, namely, the 8-hour TWA permissible exposure limit (PEL) as defined in. Occupational Safety & Health Administration for additional clarification on this issue. (Corrections ) Please see the letter to Mr. If you have any further questions, please contact the. If you would like further information regarding California occupational safety and health requirements, you may contact the California Department of Industrial Relations directly at the following address: [Chuck Cake, Acting DirectorĬalifornia Department of Industrial Relations States are required to adopt and enforce occupational safety and health standards at least as effective as those promulgated by Federal OSHA and may be more stringent. Therefore, employers in California must comply with State occupational safety and health requirements. Good industrial hygiene practice dictates that significant changes in the work process would call for additional personal air monitoring thus acquiring revised data which will be representative of employee exposure(s).Īs you may be aware, the State of California administers its own occupational safety and health program under a plan approved and monitored by Federal OSHA. need to be sampled in order to acquire a representative sampling of employee exposure. The industrial hygiene survey will allow the employer to establish which shift(s), process(es), etc. This survey must include job tasks and the potential created for the exposure by these tasks over all operational shifts as well as the potential for increased exposure(s) as a result of production/work demands. It is well established by the industrial hygiene profession that a workplace survey should be conducted in a facility to determine the potential for exposure(s) in excess of established exposure levels such as the PEL and TLV's. OSHA would be justified in issuing a citation when personal air sampling indicates employee exposure to be in excess of the PEL on the day sampled. Therefore, your interpretation #1 comes closest to OSHA's definition of an 8-hour TWA PEL. This should not be confused with short term exposure limits (STELs) or peaks. The 8-hour TWA PEL is the level of exposure established as the highest level of exposure an employee may be exposed to without incurring the risk of adverse health effects. 114, June 12 1992, pps 26539, 26556, 26572, 2650 as follows: "TWA is the employee's average airborne exposure in any 8-hour work shift of a 40-hour work week which shall not be exceeded." The 8-hour TWA PEL is defined in the Federal Register, Vol. Dear, Assistant Secretary for the Occupational Safety and Health Administration (OSHA), requesting an interpretation on 8-hour total weight average (TWA) permissible exposure limit (PEL) as defined in. This is in response to your letter of July 7, addressed to Mr.
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