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					NOISE EXPOSURE ESTIMATION

This spreadsheet may be used to calculate the accumulated dose and TWA for a particular job activity,
based on area/equipment noise level data. Two dose and TWA calculations are performed - one for
Hearing Conservation Program purposes, and one for Engineering Noise Control considerations.
JUST FILL IN THE YELLOW HIGHLIGHTED CELLS WITH THE MEASURED DATA


JOB TITLE:
DEPARTMENT:
SHIFT LENGTH: 8 hours

                          ESTIMATED TOTAL DAILY NOISE DOSE AND TWA FROM EXPOSURE TO
                                DIFFERENT SOUND LEVELS FOR DIFFERENT DURATIONS
                                             (5 dBA EXCHANGE RATE)



                                                                                                     HCP       ENG. CONTROLS
                                                     SOUND      REFERENCE        EXPOSURE          % DOSE         % DOSE
SOURCE       JOB                                     LEVEL,     DURATION,          TIME IN           PER             PER
NUMBER       ACTIVITY/LOCATION                        dBA        MINUTES          MINUTES          SOURCE         SOURCE


       1                                                                NA                          0.00              0.00
       2                                                                NA                          0.00              0.00
       3                                                                NA                          0.00              0.00
       4                                                                NA                          0.00              0.00
       5                                                                NA                          0.00              0.00
       6                                                                NA                          0.00              0.00
       7                                                                NA                          0.00              0.00
       8                                                                NA                          0.00              0.00


             HEARING CONSERVATION PROGRAM -
             ref: 30 CFR Part 62, Table 62-1       TOTAL ACCUMULATED DOSE:                           0.0 %
             ref: 29 CFR 1910.95, Table G16a
                                       CALCULATED TWA:                                               0.0 dBA


             ENGINEERING NOISE CONTROLS -
             ref: 30 CFR Part 62, Table 62-1       TOTAL ACCUMULATED DOSE:                           0.0 %
             ref: 29 CFR 1910.95, Table G16a
                                       CALCULATED TWA:                                               0.0 dBA




Calculations are based on guidelines established by the Mine Safety and Health Administraion (MSHA) and Occupational
Safety & Health Adm. (OSHA) Occupational Noise Exposure Standards 30 CFR Part 62 and 29 CFR 1910.95.

Reference Duration is the amount of time it takes to reach a 100% dose at a certain sound level.

Percent Dose is the percentage of noise exposure received from each noise source.
   - For a Hearing Conservation Program (HCP), noise levels from 80 to 130 dBA are used in the calculation of dose.
   - For Engineering Noise Control considerations, noise levels from 90 to 130 dBA are used in the calculation of dose.

TWA is the time-weighted average noise exposure in dBA, which is based on 8-hour workshifts.
  - The Action Level (50% dose) is a TWA of 85 dBA.
  - The Criterion Level (100% dose) is a TWA of 90 dBA.


Associates in Acoustics, Inc.
31385 Burn Lane
Evergreen, CO 80439
(303) 670-9270
www.esion.com

				
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