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nnovative onstruction olutions they are performed in or over a shaft or rise . Fresh air must be supplied to all underground work areas in sufficient amounts to prevent any dangerous or harmful accumulation of dusts, fumes, mists, vapors, or gases . 4 . 2 . 11 NOISE ICS is required to control employee exposure to occupational noise levels of 85 decibels ( measured on the A scale [ slow response ] referred to as dBA ) and above by implementing a hearing conservation program that meets the requirements of the Cal /OSHA Occupational Noise Exposure standard T8 CCR 5096 - 5100 and or 29 CFR 1910 . 95 . A noise assessment may be conducted by the Health and Safety Manager ( HSM ) or designee based on potential to emit noise above 85 dBA and also considering the frequency and duration of the task . • Areas or equipment emitting noise at or above 90dBA shall be evaluated to determine feasible engineering controls . When engineering controls are not feasible , administrative controls can be developed and appropriate hearing protection will be provided . • Areas or equipment emitting noise levels at or above 85 dBA, hearing protection must be worn . • Employees exposed to 85 dBA or a noise dose of 50% must participate in the Hearing Conservation program including initial and annual ( as required ) audiograms . • The HSM will evaluate appropriate control measures and work practices for employees who have experienced a standard threshold shift ( STS ) in their hearing . • Hearing protection will be maintained in a clean and reliable condition , inspected prior to use and after any occurrence to identify any deterioration or damage , and damaged or deteriorated hearing protection repaired or discarded . • In work areas where actual or potential high noise levels are present at any time , hearing protection must be worn by employees working or walking through the area . • Areas where tasks requiring hearing protection are taking place may become hearing protection required areas as long as that specific task is taking place . • High noise areas requiring hearing protection should be posted or employees must be informed of the requirements in an equivalent manner and a copy of the OSHA standard 29 CFR 1910 . 95 shall be posted in the workplace . Employees must be trained in the proper use of required hearing protection . 4 . 2 . 12 IONIZING RADIATION Intentionally Left Blank 27