# Simple calculations. due in 6 hours

1.) You have been tasked with establishing and implementing an  effective hearing conservation program for a metal stamping facility.  Noise monitoring shows that employees working in the press areas of the  facility are exposed to 8-hour TWA noise exposures between 85.0 dBA and  89.0 dBA. Based on the requirements of 29 CFR 1910.95, summarize the  requirements for an effective hearing conservation program and discuss  steps to make the program as effective as possible. Please refer to 29  CFR 1910.95(b)(2) for the formula.

2.) Three workers (8-hour work shift) were monitored for work in  different areas of a facility using calibrated noise dosimeters. The  results are summarized in the attached table labeled question 3  attachment.

a. Calculate the 8-hour time-weighted average (TWA) noise exposure for each of the three workers.

b. Summarize which (one) of the exposures exceeds OSHA’s permissible exposure limit (PEL) and/or action level for noise.

c. Discuss what factors about the noise monitoring may have affected the accuracy of the noise measurements.

Show your work for all mathematical calculations. Please refer to  Appendix A to 29 CFR 1910.95 for assistance on how-to solve this  problem.

3.) A plant that manufactures automobile chassis includes a  production area containing 100 robotic welding stations. An adjacent  area contains 10 welding booths where employees perform hand welding  using MIG welders to rework welds that have been identified as  unacceptable. Personal air sampling shows that personal exposures at 5  of the welding booths located in the middle of the rework exceed the  OSHA PEL for lead, nickel, and iron oxide fumes. On average, the  personal exposures exceed the applicable OSHA PEL by 2-3 times.

Using OSHA’s Hierarchy of Controls, write one paragraph for the  hazard scenario above that summarizes your approach to reducing the  risks associated with the hazard. Indicate which type of hazard control  you will use, and describe exactly how it will be used to control the  hazard.

4.) A plant has an operation that produces automotive headliners in a  press. The process uses a compound that contains methylene bisphenyl  isocyanate (MDI). The compound containing MDI must be used in the  production process to meet the client’s specifications for the  headliner. The OSHA PEL for MDI is 0.02 ppm as a ceiling concentration.  Personal air samples collected for 15 minutes at the time when the press  opens show that short-term exposures range from 0.02 ppm to 0.06 ppm.

Using OSHA’s Hierarchy of Controls, write one paragraph for the  hazard scenario above that summarizes your approach to reducing the  risks associated with the hazard. Indicate which type of hazard control  you will use, and describe exactly how it will be used to control the  hazard.

5.) A press area of a plant has six 400-ton presses in operation 24  hours a day, 7 days a week. Personal monitoring using noise dosimeters  has shown that 8-hour time-weighted average (TWA) exposures range from  92.0 dBA to 94.5 dBA.

Using OSHA’s Hierarchy of Controls, write a hazard scenario using the  information above that summarizes your approach to reducing the risks  associated with the hazard. Indicate which type of hazard control you  will use, and describe exactly how it will be used to control the  hazard.

6.) Employees in the paint department of an automotive parts  production facility use styrene to clean residue off the parts as they  come off the paint line. The OSHA PEL for styrene is 100 ppm as an  8-hour TWA exposure. Personal air samples show that during peak  production times, exposures range from 150 ppm to 200 ppm for an 8-hour  shift. The parts cleaning is performed in a small room with one door.

Using OSHA’s Hierarchy of Controls, write one paragraph for the  hazard scenario above that summarizes your approach to reducing the  risks associated with the hazard. Indicate which type of hazard control  you will use, and describe exactly how it will be used to control the  hazard.

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