Civil Engineering Reference
In-Depth Information
ACOSTICAL
ENGINEER
ENGINEERING
CONTROLS
WARNING
SIGNALS
HEARING
PROTECTORS
SAFETY
ENGINEER
AUDIOMETRIC
RECORDKEEPING
AND DATABASE
AUDIOLOGIST,
NURSE, OR M.D.
HCP
DEVELOPMENT
AND
MANAGEMENT
NOISE
MONITORING
AND
EVALUATION
AUDIOMETRY
EMPLOYEE
NOISE
EXPOSURE
RECORDS
JOB ROTATION
AND
SCHEDULING
MOTIVATION
AWARENESS
WORK
SUPERVISOR
EDUCATION
AND
TRAINING
EQUIPMENT
PROCUREMENT
NOISE CRITERIA
MANAGEMENT
HCP
COORDINATOR
KEY:
PRIMARY OSHA
HCP ELEMENTS
OTHER HCP
ELEMENTS
CRITICAL
HCP NODE
PERSONNEL
FB
HCP COORDINATOR
LINK
PHYSICAL ACTIVITY
LINK
INFORMATION LINK
FEEDBACK LOOP
FIGURE 31.7
System and components of an industrial hearing conservation program.
All OSHA-related audiograms must include 500, 1000, 2000, 3000, 4000, and 6000 Hz, in comparison to
most clinical audiograms that extend from 125 to 8000 Hz. If an STS is revealed, a licensed physician or
audiologist must review the audiogram and determine the need for further audiological or otological
evaluation, the employee must be notified of the STS, and the selection and proper use of HPDs must
be revisited. An annual audiogram is substituted for the original baseline when the STS is determined
to be persistent or when the annual audiogram indicates significant improvement over the baseline.
31.5.2.2.3 Hearing Protection Devices
A selection of HPDs that are suitable for the noise and work situation must be made available to all
employees whose TWA exposures meet or exceed 85 dBA. Earplugs consist of vinyl, silicone, spun fiber-
glass, cotton
wax combinations, and closed-cell foam products that are inserted into the ear canal to
form a noise-blocking seal. Proper fit to the user's ears and training in insertion procedures are critical
to the success of earplugs. A related device is the semi-insert or ear canal cap, which consists of earplug-
like pods that are positioned at the rim of the ear canal and held in place by a lightweight headband. The
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