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The sampling results for the chemical hazards you tested for Acme Automotive Parts (AAP) are listed in the following table. The volumes that are listed are what you provided to the laboratory.

HazardAnalytical ResultVolume (Time)
Manganese Fume5 µg30 L (15-minute)
Copper Fume140 µg960 L (8-hour)
Lead Fume40 µg960 L (8-hour)
1,2,4 trimethylbenzene5 µg48 L (8-hour)
Toluene125 µg48 L (8-hour)
Xylene20 µg48 L (8-hour)
Metal Working Fluids500 µg720 L (8-hour)

For each of the chemical hazards complete the following:   

  • Calculate the exposure concentration in mg/m3 for the aerosols.
    • Calculate the exposure in parts per million (ppm) for the vapors.
    • Discuss where you think errors might have been introduced into the results.
    • Compare your calculated exposures to one of the occupational exposure limits (OELs) in the table below.
    • Do any of the calculated exposures exceed the OEL you chose?
    • Discuss why you chose the OELs you used.
    • Provide your opinion as to whether the risk associated with each exposure is an acceptable level of risk.
HazardOccupational Exposure Limits (OEL)s
Manganese Fume5 mg/m3 (OSHA Ceiling ) 0.1 mg/m3 (ACGIH 8-hour TWA (I))
Copper Fume0.1 mg/m3 (OSHA 8-hour TWA) 0.2 mg/m3 (ACGIH 8-hour TWA)
Lead Fume0.05 mg/m3 (OSHA 8-hour TWA) 0.05 mg/m3 (ACGIH 8-hour TWA
1,2,4 trimethylbenzeneOSHA – None Established 25 ppm (ACGIH 8-hour TWA TLV)
Toluene200 ppm (OSHA 8-hour TWA) 300 ppm (OSHA Ceiling) 20 ppm (ACGIH 8-hour TWA TLV)
Xylene100 ppm (OSHA 8-hour TWA) 100 ppm (ACGIH 8-hour TWA
Metal Working FluidsOSHA – None Established 0.5 mg/m3 (NIOSH 10-hour TWA REL)

The results for the noise sampling in the following table were recorded from your noise dosimeters. All the samples were collected for the full shift using 90 decibels on the A scale (dBA) as the criterion level and a 5 decibels (dB) exchange rate.

LocationShift LengthResult
Shipping/Receiving8 hours78.3 dBA (Lavg)
Hydraulic Press12 hours93.0 dBA (Lavg)
Metal Working Line12 hours84 dBA (Lavg)
Robotic Welding12 hours80.5 dBA (Lavg)
Hand Welding12 hours81.3 dBA (Lavg)
Paint Booth12 hours79.5 dBA (Lavg)
QA/QC Laboratory8 hours70.0 dBA (Lavg)
Final Inspection8 hours73.5 dBA (Lavg)

Answer the following for each of the locations listed above:

  • Convert the results from dBA to percent. Make sure you show all your work for calculations.
    • Which of the results exceeds the OSHA PEL?
    • Which of the results exceeds the OSHA action level?
    • Provide your opinion as to whether the risk associated with each exposure is an acceptable level of risk.

Your assignment must be at least three pages in length, not counting the title or reference pages. Your assignment must use at least two references. One must be gathered from the CSU Online Library; the other may be your textbook. All references and in-text citations must be formatted according to APA Style.


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