ES&H Manual



6683 Appendix T1

Silica Work Requirements



Jefferson Lab has determined that working with silica carries an unmitigated Risk Code >2.  At a minimum all tasks involving silica are discussed with the supervisor prior to commencement.  An Operational Safety Procedure (OSP) is written for any work considered to be Risk Code >2 in accordance with ES&H Manual Chapter 3210 Work Planning, Control, and Authorization Process.


1.0            Purpose


This appendix provides Jefferson Lab’s minimum requirements when working with silica including: work planning, work activities, and clean-up.


2.0            Scope


This procedure defines additional mitigation measures for activities involving silica over and above those required by standard protecting measures.


Operations, not listed below, that cause silica particles to become airborne are considered to have a Risk Code >2 and require a Work Control Document.  These activities include dry sweeping, scraping, or using compressed air.  Contact Industrial Hygiene for appropriate mitigation requirements for these activities.


The process steps for this procedure coordinate with ES&H Manual Chapter 6683 Silica Safety Program.


3.0            Responsibilities

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


3.1              Trained Worker

·         Complete and maintain appropriate training:

o   SAF138 Silica Dust Hazards in Construction

o   Medical monitoring, as required

·         Perform work activities within hazard controls.

·         If work conditions change or the mitigations do not appear to be effective (i.e. visible dust), request a hazard evaluation of work activities from Industrial Hygiene (x7882).


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

·         Provide a complete Work Plan in accordance with process steps.

·         Assign only Trained Workers to silica work.


3.2.1        SOTR also:

·         Inform subcontractors that their Activity Hazard Analysis (AHA or THA) must include the planned technique(s) to mitigate silica exposure and the program used to train workers.  (Minimally to Jefferson Lab requirements.) 

·         If provided, submit subcontractor’s silica AHA to Jefferson Lab’s Silica Subject Matter Expert (see ES&H Manual Chapter 2410 Appendix T1 Hazard Issues List – Silica) for approval prior to commencement of work. 


3.3              Industrial Hygiene

·         Perform silica work/area hazard evaluation, as appropriate.


4.0            Process Steps


The following tables provide examples of typical activities and materials associated with work at Jefferson Lab.  (This list is not all-inclusive.)  Evaluate all tasks prior to commencement of work, for potential silica generation. 





·         Jack Hammering

·         Drilling

·         Grouting

·         Mixing

·         Clean-up/Sweeping

·         Sand Blasting

·         Sawing/Cutting

·         Sanding

·         Shoveling/Moving

·         Removal of furnace insulation (RCF/SVF)


·         Rock

·         Sand

·         Grout

·         Concrete

·         Bricks

·         Concrete  Blocks

·         Furnace Insulation (RCF/SVF)




4.1              Work Planning


The following process steps are completed by the Supervisor.


When working with silica take associated hazard issues into consideration (i.e. heavy lifting, excessive noise, liquid waste generation.)


Step 1:             Task Hazard Analysis (THA) (see ES&H Manual Chapter 3210 Appendix T2 Task Hazard Analysis Worksheet) include:

·         Engineering Controls – Such as water applied at point of generation, local exhaust ventilation with HEPA filtration.  Contact Industrial Hygiene (x7882) for other approved methods.

·         Training Requirements – SAF138 Silica Dust Hazards in Construction and medical monitoring.

·         Personal Protective Equipment (PPE) - Air Purifying Respirators or equivalent (see ES&H Manual Chapter 6630 Appendix T2 Respirator Use and Approval Requirements)


Step 2:             Request a hazard evaluation from Industrial Hygiene (x7882) to address additional concerns.


Step 3:             Assign only Trained Workers to the work.  Ensure they are appropriately trained, understand the hazards, and implement appropriate hazard mitigation(s) prior to work.


4.2              Work Activities


Only Trained Workers may perform the following process steps.


Step 1:             Abide by the work plan 

·         Follow all safety precautions as outlined within the work plan.

·         If work conditions change or the mitigations do not appear to be effective (i.e. visible dust), request a hazard evaluation of work activities from Industrial Hygiene (x7882).


4.3              Clean-up


Only Trained Workers may perform the following process steps.


Step 1:             Vacuum

·         Use a HEPA vacuum – If one is not available, you may obtain one from Industrial Hygiene (x7882). 

·         Clean the exterior surface of the vacuum prior to returning to owner.

·         When full, dispose of used HEPA filters in ordinary trash.


NOTE:  Only HEPA Vacuums with current performance testing validations are authorized for use within areas containing radioactive material (e.g.: experimental halls and beam enclosures). 


HEPA vacuums used for silica in radioactive material areas need to be coordinated through Industrial Hygiene and Radiation Control.  All HEPA vacuums and the components, used within these areas, must be surveyed prior to removal and may NOT be disposed of in ordinary trash.


All Jefferson Lab HEPA vacuums are required to be inspected annually.  See Industrial Hygiene for more information regarding these types of inspections.


Step 2:             Surface Wipe Down

·         Use wet cloths or rags to wipe up residual material. 

·         Immediately dispose of used cloths or rags in ordinary trash.


5.0            Revision Summary


Revision 0.1 – 06/28/13 – Added responsibility to request hazard evaluation of work to 3.1 Trained Worker and added conditional step to 4.2 Work Activities per MLogue.

Revision 0 – 06/08/12 - This is new 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 7/3/2013.