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1910.1052(d)(1) Characterization of Employee Exposure
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Where MC is present in the workplace, the employer shall determine each employee's exposure by either:
Taking a personal breathing zone air sample of each employee's exposure; or
Taking personal breathing zone air samples that are representative of each employee's exposure.
The employer shall ensure that the methods used to perform exposure monitoring produce results that are accurate to a confidence level of 95 percent, and are:
Within plus or minus 25 percent for airborne concentrations of MC above the 8-hour TWA PEL or the STEL; or
Within plus or minus 35 percent for airborne concentrations of MC at or above the action level but at or below the 8-hour TWA PEL.
The employer may consider personal breathing zone air samples to be representative of employee exposures when they are taken as follows:
The employer has taken one or more personal breathing zone air samples for at least one employee in each job classification in a work area during every work shift, and the employee sampled is expected to have the highest MC exposure.
The employer has taken one or more personal breathing zone air samples which indicate the highest likely 15-minute exposures during such operations for at least one employee in each job classification in the work area during every work shift, and the employee sampled is expected to have the highest MC exposure.
Personal breathing zone air samples taken during one work shift may be used to represent employee exposures on other work shifts where the employer can document that the tasks performed and conditions in the workplace are similar across shifts.
Related Code Sections
1910.1052(d)(1) Toxic and Hazardous Substances, Characterization of Employee Exposure
of employee exposures when they are taken as follows ...
OSHA 1910 General Industry > Z Toxic and Hazardous Substances > 1910.1052 Methylene Chloride > 1910.1052(d) Exposure Monitoring > 1910.1052(d)(1) Characterization of Employee Exposure
1910.1052(d)(1)(ii)(B) Toxic and Hazardous Substances, Short-Term Exposure Limits
The employer has taken one or more personal breathing zone air samples which indicate the highest likely 15-minute exposures during such operations ...
OSHA 1910 General Industry > Z Toxic and Hazardous Substances > 1910.1052 Methylene Chloride > 1910.1052(d) Exposure Monitoring > 1910.1052(d)(1) Characterization of Employee Exposure > 1910.1052(d)(1)(ii) Representative Samples > 1910.1052(d)(1)(ii)(B) Short-Term Exposure Limits
1910.1052(d)(1)(ii)(A) Toxic and Hazardous Substances, 8-Hour TWA PEL
every work shift, and the employee sampled is expected to have the highest MC exposure ...
OSHA 1910 General Industry > Z Toxic and Hazardous Substances > 1910.1052 Methylene Chloride > 1910.1052(d) Exposure Monitoring > 1910.1052(d)(1) Characterization of Employee Exposure > 1910.1052(d)(1)(ii) Representative Samples > 1910.1052(d)(1)(ii)(A) 8-Hour TWA PEL
1910.1052(d)(1)(ii)(C) Toxic and Hazardous Substances, Exception
Personal breathing zone air samples taken during one work shift may be used to represent employee exposures on other work shifts where the employer ...
OSHA 1910 General Industry > Z Toxic and Hazardous Substances > 1910.1052 Methylene Chloride > 1910.1052(d) Exposure Monitoring > 1910.1052(d)(1) Characterization of Employee Exposure > 1910.1052(d)(1)(ii) Representative Samples > 1910.1052(d)(1)(ii)(C) Exception
1910.1052(d)(1)(iii)(A) Toxic and Hazardous Substances,
Within plus or minus 25 percent for airborne concentrations of MC above the 8-hour TWA PEL or the STEL ...
OSHA 1910 General Industry > Z Toxic and Hazardous Substances > 1910.1052 Methylene Chloride > 1910.1052(d) Exposure Monitoring > 1910.1052(d)(1) Characterization of Employee Exposure > 1910.1052(d)(1)(iii) Accuracy of Monitoring > 1910.1052(d)(1)(iii)(A)