ES&H Manual



6640 Appendix T1

High Noise Hazard Evaluation and Area Monitoring



1.0          Purpose


A High Noise Hazard Evaluation and subsequent area monitoring is required when individual exposure is suspected to be at or above 85 dBA.  This appendix provides recognized high noise conditions; the process steps used to schedule and obtain a hazard evaluation; and how area monitoring is implemented.


2.0          Scope


Personal noise dosimetry is required when work is regularly conducted within a “high noise” area, or upon request.  If high noise is found to be a concern, appropriate personal protective equipment (PPE), monitoring, and training is initiated.  


The process steps for this procedure are performed in coordination with ES&H Manual Chapter 6640 Hearing Conservation Program.


3.0          Responsibilities

NOTE:           Management authority may be delegated at the discretion of the responsible manager.


3.1       Anyone at Jefferson Lab

·       Request a High Noise Hazard Evaluation if you recognize possible high noise conditions.


3.2       Supervisor/Subcontracting Officer’s Technical Representative (SOTR)/Sponsor

·       Ensure individuals under your authority, who work in, or are otherwise exposed to, high noise levels, are informed, and appropriate hearing protection is utilized in accordance with ES&H Manual Chapter 6620 Personal Protective Equipment (PPE) Program and ES&H Manual 6800 Occupational Medicine.


3.3       Industrial Hygiene

·       Perform High Noise Hazard Evaluations for areas/equipment when requested, or identified.

·       Initiate required monitoring.

·       Provide recommendations for engineering controls and PPE.


4.0          Process Steps


Unless otherwise stated, anyone at Jefferson Lab may perform the process steps outlined below.


4.1       High Noise Conditions Recognition


Conditions which suggest that noise may be a hazard issue include:


·       Ringing, muffling, numbness, or other unusual sensations after exposure to a noise source.

·       Ambient noise makes conversation, at a normal level, difficult.

·       Tools that produce high noise on a regular or sporadic basis.

·       When listed on an individual’s Skills Requirements List.


Other considerations include: warnings/cautions provided in equipment’s owner manuals, and accumulated noise of two or more “safe” sources. 


4.2       High Noise Hazard Evaluation


Request a High Noise Hazard Evaluation from Industrial Hygiene when high noise symptoms are recognized.  

·       Concerned individuals are allowed to observe the evaluation process. 





NL > 100 dBA


(i.e.: NL is greater than or equal to 100 dBA.)

Dual Hearing Protection is required.


Engineering controls are initiated for permanent installations.

1.      The Supervisor and area owner are informed. 


2.      The following activities are initiated:

·     Area Monitoring assigned in accordance with Industrial Hygiene Department procedures.

·     Medical Monitoring in accordance with ES&H Manual Chapter 6800 Appendix T1 Medical Monitoring

·     Personal Protective Equipment (PPE) in accordance with ES&H Manual Chapter 6620 PPE Program

·     Postings Installed in accordance with ES&H Manual Chapter 6640 T3 High Noise Posting Requirements

90 dBA< NL<100 dBA


(i.e.: NL is greater than or equal to 90 dBA but less than 100 dBA

Hearing Protection is required.


Engineering controls should be initiated.

85 dBA< NL<90 dBA


(i.e.: NL is greater than or equal to 85 dBA but less than 90 dBA

Hearing Protection is required.

<85 dBA


(i.e.: NL is less than 85 dBA)

Hearing Protection is NOT required.

1.      The concerned party(s) is informed of the determination. 


2.      Alternative solutions are discussed if the concern is not satisfied.


4.3       Monitoring


Monitoring is required for any area recognized, or suspected to be at or above 85 dBA.  Industrial Hygiene provides appropriate monitoring in accordance with required regulations and standards per department procedures.  Monitoring may be requested for any area at Jefferson Lab through Industrial Hygiene. 


5.0          Revision Summary


Revision 1 – 04/16/12 – Update to reflect current laboratory operations.

Revision 0 – 08/31/06 – Original content.












ESH&Q Division

Richard Owen





This document is controlled as an on-line file.  It may be printed but the print copy is not a controlled document.  It is the user’s responsibility to ensure that the document is the same revision as the current on line file.  This copy was printed on 7/27/2012.