Text For Citation: 02 Item/Group: 001A Hazard:

29 CFR 1910.1052(c)(1):The employer did not ensure that no employee(s) was exposed to an airborne concentration of methylene chloride in excess of twenty-five parts per million as an 8-hour TWA: Prep Lab: a) On or about April 14, 2022, and at times thereafter, employees who performed analytical procedures, including accelerated solvent extractions (ASE), were overexposed to dichloromethane (DCM or methylene chloride) at seventy-nine parts of DCM per million parts of air (79.3 ppm) as an eight-hour time-weighted average (8-hr TWA). These exposures were approximately 3.2 times the permissible exposure limit (PEL) of 25 ppm and were determined during a sample period of 435 minutes, using zero exposure for the unsampled portion of the 8-hour shift. b) On or about April 14, 2022, and at times thereafter, employees who performed analytical procedures, including herbicide ultrasonic extractions were overexposed to DCM at thirty-nine parts of DCM per million parts of air (39.4 ppm) as an 8-hr TWA. These exposures were approximately 1.6 times the PEL of 25 ppm and were determined during a sampling period of 450 minutes, using zero exposure for the unsampled portion of the 8-hour shift.