Letters of Interpretation

OSHA requirements are set by statute, standards, and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Each letter constitutes OSHA's interpretation of the requirements discussed.

Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information.

These letters of interpretation and the standards they address may not apply to OSHA State Plans. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or additional requirements. Please see OSHA-approved State Plans for more information.

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Date Title Standard Number
OSHA 200 Log recording CTDs. 1904 - Table of Contents
Spray booth compliance with OSHA standards is determined at the work place. 1910.107
Requirements that apply to the storage and handling of combustible liquids containing PCBs. 1910.106
Concern for seasonal employees who are exposed in the fields to pesticides which are harmful to their health. 1975.1
On scene incident commander for Hazwoper standard. 1910.120
Training requirements of Hazwoper for various functions. 1910.120, 1910.120(e), 1910.120(p), 1910.120(q), 1910.120(q)(11)(i), 1910.120(q)(11)(ii), 1910.120(e)(9), 1910.120(f), 1910.120(f)(3), 1910.38, 1910.134, 1910.1200
Equivalent training for Hazwoper. 1910.120
Academic training considered as equivalently trained for Hazwoper. 1910.120, 1910.120(e)(9), 1910.120(e)(2), 1910.120(b)(4)(ii)
Applicability of the requirements of the Hazard Communication Standard to rubber dust byproduct sold by tire recapping company. 1910.1200
Used Tire Recyclers. 1910.1200
Hazard Communication and Consumer Products. 1910.1200
Employees with previous experience and training in the removal of underground storage tanks. 1910.120
Decision or policy statement regarding the obligations and responsibilities of the employee leasing industry with respect to compliance with the Occupational Safety and Health Act. 1910.1200, 1910.1030, 1910.178(l)
Section 17 Designation OSH Act
Actively involved; generators; CERCLA 101(33) substances. 1910.120
The flash point of Bio T products. 1910.106
Motor starter circuits and energy isolation devices 1910.147
OSHA currently accepts U.S. Coast Guard devices approved as a Type I PFD, Type II PFD, Type III PFD or Type V PFD, or their equivalent. 1926.106, 1915.158, 1917.95, 1918.105
The working environment of railroad train operating employees. 1975.1
Confirmation on lockout/tagout, specifically with the standard covering periodic inspections. 1910.147