Exhibit V FESHM_4230_CONFINED_SPACES.pdf

ES&H Manual FESHM 4230

June 2025

Fermilab ES&H Manual 4230-1 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 6/2025

FESHM 4230: CONFINED SPACES

Revision History

Author Description of Change Revision Date Mitchell Lindgren • Grammatical edits and editorial changes to reflect the reorganization of Divisions/Sections/Projects (DSP) to Directorates/Divisions/Projects (D/D/P).

• Removed references to MSA Pro-R oxygen monitors.

• Added reference to OSHA 29 CFR Part 1926 Subpart AA –

Confined Spaces in Construction standard.

June 2025

Rich Ruthe Use of the RKI personal oxygen monitor in lieu of the MSA Pro-R oxygen meter for confined space entry when there is a potential presence of helium.

July 2019

Rich Ruthe Obtain the MSA Pro-R from the Fermilab Fire Department, not the ES&H Section Industrial Hygiene Group, if it is needed.

January 2019

Rich Ruthe • Notes added to provide a warning regarding the sensitivity of the oxygen sensor in the MSA Altair 5X to Helium.

• Removed the requirement for D/S’s to develop an implementation plan, which are no longer needed given that the ES&H function has been centralized.

• Added a requirement that permits & reclassification forms must be signed off by the D/S/P DSO and can be in the form of a text message or email. (Verbal approvals previously accepted.)

• Replaced Landlord or Functional Landlord DSO with D/S/P DSO.

July 2018

Rich Ruthe Added requirement to send permits & reclassification forms to ESH&Q Section. Changed retention period of permits and reclassification forms from current one year to DOE required 75 years. Revised the Confined Space Entry Permit and the Confined Space Reclassification Form to accommodate multiple entries for FFD and DSO contact, and to indicate that a full name, date and time of the contact are required.

December 2016

Robert Bushek Updated the chapter to reflect the change of Division/Section/Projects (DSP’s) ESH Groups to Division Safety Officer due to the centralization of the ESH&Q Section.

October 2015

Jonathan Staffa, Mike Bonkalski, David Baird

Added FESHM Chapter formatting and made minor edits. There were no changes to chapter content.

March 2015

June 2025

Fermilab ES&H Manual 4230-0 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 6/2025

TABLE OF CONTENTS

1.0 INTRODUCTION

2.0 DEFINITIONS

3.0 RESPONSIBLILITIES

3.1 Associate Lab Directors/Division Directors/Project Managers (ALD/DD/PM)

3.2 Environmental, Safety, and Health Division (ES&H) Industrial Hygiene Group

3.3 Task Manger/Construction Coordinator/Service Coordinator

3.4 Entry Supervisor

3.5 Authorized Attendant

3.6 Authorized Entrant

3.7 Fermilab Fire Department

3.8 Subcontractors

4.0 PROCEDURES

4.1 General Requirements

4.2 Permit-Required Confined Space Entry Procedures

4.3 Entry Permits

4.4 Confined Space Reclassification Process

4.5 Training for Confined Spaces

5.0 REFERENCES

March 2025

Fermilab ES&H Manual 4230-1 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 3/2025

1.0 INTRODUCTION

Working in confined spaces presents unique hazards because environmental conditions can change rapidly, and it may be difficult to quickly exit the space. Some of the most common problems associated with confined spaces include hazardous atmospheres (e.g., reduced oxygen, flammable, toxic), slippery surfaces, electric shock, poor illumination, and flooding. This chapter describes the procedures to be used for entry into these spaces. If an oxygen deficiency hazard (ODH) exists as identified by Fermilab Environment, Safety and Health Manual (FESHM) Chapter 4240 Oxygen Deficiency Hazards and is within a confined space, the confined space entry team is also expected to follow any training and monitoring requirements found within FESHM Chapter 4240.

2.0 DEFINITIONS

Acceptable Entry Conditions - Conditions that must exist in a confined space to allow entry and to ensure that employees involved can safely enter and work within the space.

Authorized Attendant - A trained employee, subcontractor, or Fermilab user who is stationed and remains outside of the confined space for the purpose of monitoring the entrants and who performs all attendant's duties. An attendant shall be stationed outside any confined space requiring a permit for entry.

Authorized Entrant - A trained employee, subcontractor, or Fermilab user who will enter a confined space.

Confined Space - A space that:

1. Is large enough and so configured that an employee can bodily enter and perform assigned work; and

2. Has limited or restricted means for entry or exit; and

3. Is not designed for continuous occupancy

“Restricted entry or exit,” means physical impediment of the body, e.g., use of the hand or a contortion of the body to enter, or exit from, the space. Underground beamline enclosures are not usually considered confined spaces. Enclosures that can be accessed by a ladder with no other access/egress points are considered confined spaces. The Landlord Directorate Safety Officer (DSO) shall evaluate large-scale excavations on a case-by-case basis.

Confined Space Entry Permit - The written or printed document established by Fermilab, the contents of which are based on the hazard identification and evaluation for that confined space and is the instrument by which Fermilab authorizes its authorized entrants to enter permit-required confined spaces.

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Fermilab ES&H Manual 4230-2 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 3/2025

Confined Space Reclassification Form – A form that allows a trained individual to temporarily reclassify a permit-required confined space as a non-permit confined space provided that certain conditions are met.

Construction Coordinator (CC) – A person specifically assigned to oversee the work of a construction subcontract for conformance to the subcontract agreements/documents. Construction Coordinators serve as the primary construction point of contact between the Subcontractor and the Laboratory.

Emergency - Any occurrence or change of conditions (including any failure of hazard control or monitoring equipment) internal or external to the confined space that could endanger entrants.

Engulfment - The surrounding and effective capture of a person by a liquid or finely divided (flowable) solid substance that can cause death.

Entry - The act by which a person passes through the opening into a confined space. The entrant is considered to have entered as soon as any part of the entrant's body breaks the plane of an opening into the space.

Entry Supervisor – A trained employee, subcontractor or scientific user responsible for determining if acceptable entry conditions are present where entry into a confined space is planned, for authorizing entry and overseeing entry operations, and for terminating entry.

Functional Landlord – Directorate/Division/Project which routinely enters the confined space.

Hazardous Atmosphere - An atmosphere that may expose employees to the risk of death, incapacitation, impairment of ability to self-rescue (that is, escape unaided from a confined space) injury, or acute illness from one or more of the following causes: (1) Flammable gas, vapor, or mist in excess of 10 percent of its lower explosive limit; (2) Airborne combustible dust at a concentration that meets or exceeds the lower explosive limit; (3) Atmospheric oxygen concentration below 19.5% or above 23.5%; (4) Atmospheric concentration of any substance which may exceed either the Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (PEL) or the American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Values (TLV) for that substance; (5) Any other atmospheric condition that is immediately dangerous to life or health.

NOTE: For air contaminants for which ACGIH or OSHA has not determined a dose or permissible exposure limit, other sources of information, such as Safety Data Sheet, published information, and internal documents can provide guidance in establishing acceptable atmospheric conditions.

IDLH (Immediately Dangerous to Life or Health) - Any condition which poses an immediate or delayed threat to life or that would cause irreversible adverse effects or that would interfere with an individual's ability to escape unaided from the confined space.

Fermilab ES&H Manual 4230-3 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 3/2025

Landlord – Directorate/Project responsible for the space.

LEL (Lower Explosive Limit) - The lowest concentration of gas or vapor (% by volume in air) that will burn or explode if an ignition source is present at ambient temperatures.

Non-Permit Confined Space - A confined space that does not contain or, with respect to atmospheric hazards, have the potential to contain any hazard capable of causing death or serious physical harm.

NOTE: If a confined space contains or, with respect to atmospheric hazards, has the potential to contain any hazard capable of causing death or serious physical harm, the space shall be considered a Permit-Required Confined Space. See Section 4.0 for detailed procedures on entry into Permit-Required Confined Spaces.

CAUTION: Introducing a hazard (e.g., welding, painting, chemical use, etc.) into a non-permit confined space may cause the space to become a permit-required confined space.

Oxygen Deficient Atmosphere - An atmosphere containing less than 19.5% oxygen by volume.

Oxygen Enriched Atmosphere - An atmosphere containing more than 23.5% oxygen by volume.

PEL (Permissible Exposure Limit) - An exposure limit established by OSHA.

Permit-Required Confined Space:

If the confined space has one or more of the following characteristics, the entry will require a permit to be valid for the duration of the job if the conditions specified on the permit do not change:

1. Contains, or has a potential to contain, a hazardous atmosphere;

2. Contains a material that has the potential for engulfing an entrant;

3. Has an internal configuration such that an entrant could be trapped or asphyxiated by inwardly converging walls or by a floor which slopes downward and tapers to a smaller cross-section; or

4. Contains any other recognized serious safety or health hazard.

Service Coordinators (SC) - The Laboratory employee point of contact between the service subcontractor and the Laboratory for a specific work activity, responsible for overseeing the subcontractor’s work effort.

Fermilab ES&H Manual 4230-4 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 3/2025

Task Manager (TM) – A Directorate-designated individual specifically assigned to oversee and direct a work activity. The Task Manager has primary responsibility for developing hazard assessments for the work, as prescribed in FESHM 2060 – Work Planning and Hazard Analysis.

TLV (Threshold Limit Value) - An exposure limit that is published by ACGIH.

Toxicity - All the adverse biological effects resulting from an exposure to a harmful substance.

Welding/Burning/Brazing - An operation that requires a Welding/Burning/Brazing Permit per FESHM Chapter 6020.2 Welding, Burning & Brazing.

3.0 RESPONSIBLILITIES

3.1 Associate Lab Directors/Division Directors/Project Managers (ALD/DD/PM)

Ensure that:

1. This policy is implemented within their Directorate, Division, or Project.

2. Confined space entry notification methods are coordinated with other

Directorates/Divisions/Projects when entering another D/D/P’s confined space.

3. The Environment, Safety, & Health Division (ES&H) Industrial Hygiene Group is notified of any new, updated, or modified confined spaces for review.

4. An inventory of confined spaces is maintained for which they are Landlord. Landlords may obtain database information about the characteristics of the space from the Functional Landlord(s). The inventory is maintained on the Environment, Safety, and Health (ES&H) Web-site. This database indicates which permit-required confined spaces might be reclassified.

5. There is coordination with the ES&H Division to provide Fermilab specific training for Fermilab employees (including rented technicians), and scientific users who will work in confined spaces.

All training records shall be entered into TRAIN.

6. The confined space entry team, Service Coordinators, Task Managers, and Construction

Coordinators are provided with expertise regarding entry procedures and hazard control strategies for Fermilab or subcontractor employees. Direct communication with employees or subcontractors may be needed, depending on the scope of the project.

7. Confined spaces, where they are Landlord, are labeled per the general requirements of this Chapter.

8. Monitoring equipment is calibrated immediately prior to use, or calibration is coordinated with the DSO or with the Industrial Hygiene Group.

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Fermilab ES&H Manual 4230-5 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 3/2025

3.2 Environmental, Safety, and Health Division (ES&H) Industrial Hygiene Group

1. Provides a uniform training program for the Directorates/Divisions/Projects to use for work in confined spaces.

2. Provides expertise to Directorates/Divisions/Projects on all aspects of confined space entry.

3. Provides a supply of signs to denote confined spaces.

4. Maintains lab-wide confined space database on the ES&H website that contains an inventory of confined spaces.

5. Purchases and maintains monitoring equipment required by this chapter for use by Fermilab employees and scientific users.

6. Reviews annually, or more frequently, confined space permits, reclassification forms and program for effectiveness. The review shall cover all Directorates/Divisions/Projects, including work coordinated by Construction Coordinators, Task Managers or Service Coordinators.

3.3 Task Manger/Construction Coordinator/Service Coordinator

1. Informs subcontractors that the workplace contains confined spaces and that entry is allowed only through a confined space permit system meeting the requirements of OSHA’s Permit-Required Confined Spaces standard, 1910.146, and Confined Spaces in Construction, 1926 Subpart AA.

Additional requirements are highlighted in this chapter.

2. Apprises subcontractors of the hazards associated with the confined space(s).

3. Apprises the subcontractor of any precautions or procedures that have been implemented for the protection of employees in or near the confined space where subcontractor personnel will be working.

4. Ensures that confined space activities are completed in accordance with the subcontractor’s confined space entry program.

5. Coordinates entry operations with the subcontractor when both Fermilab and subcontractor personnel will be working in or near the confined space.

6. Coordinates entry operations with, and facilitates communication between, the subcontractors when two or more different subcontractors will be working in or near the confined space on the same day.

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7. Notifies the Fermilab Fire Department and Directorates/Divisions/Project DSO prior to entry.

Information shall include the location of the entry, the type of form used (Entry Permit or Reclassification Form), the type of non-entry retrieval system used (if applicable), the number of entrants, and the nature of the work.

8. Debriefs the subcontractor at the conclusion of the entry operations regarding any hazards confronted or created in the confined space during entry operations.

3.4 Entry Supervisor

1. Knows the hazards that may be encountered during entry, including information on the mode, signs and/or symptoms, and consequences of the exposure and prepares written procedures as may be required for entry. These procedures should be revised whenever conditions change the hazards associated with the entry.

2. Verifies, by checking that the appropriate information has been entered onto the permit, that all tests specified on the permit have been conducted, and that all entry procedures and equipment specified by the permit are in place before endorsing the permit and allowing entry to begin.

3. Notifies the Fermilab Fire Department and Directorates/Divisions/Project DSO prior to entry.

Information shall include the location of the entry, the type of form used (Entry Permit or Reclassification Form), the type of non-entry retrieval system used (if applicable), the number of entrants, and the nature of the work.

4. Determines that entry operations remain consistent with terms of the entry permit and that acceptable entry conditions are maintained, including whenever responsibility for a confined space entry operation is transferred to another organization.

5. The entry supervisor may also serve as the attendant or entrant, provided that they have received the necessary training and can adequately fulfill the duties and responsibilities of each position.

6. Verifies training of attendants and entrants.

7. Communicates entry procedures to attendants and entrants.

8. Removes unauthorized individuals who enter or who attempt to enter the permit space during entry operations.

9. Passes duties to another entry supervisor if the permit-required confined space entry continues over multiple shifts.

10. Terminates the entry and cancels the permit when the entry operations covered by the entry permit have been completed or when a condition that is not allowed under the entry permit arises in or

Fermilab ES&H Manual 4230-7 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 3/2025 near the permit space. In the event conditions arise which are not authorized on the permit, the entry supervisor shall notify the Landlord and Functional Landlord.

3.5 Authorized Attendant

1. Knows the hazards that may be faced during entry, including information on the mode, signs or symptoms (including any possible behavioral effects), and consequences of the exposure.

2. Continuously maintains an accurate count of authorized entrants in the confined space.

3. Remains outside the confined space during entry operations until relieved by another attendant, or entry is terminated.

4. Maintains constant communication with authorized entrants (voice, radio, etc.) and maintains contact with entrants as necessary to monitor their status.

5. Monitors activities inside and outside of the confined space to determine if it is safe for entrants to remain in the space. This includes air monitoring. Orders the authorized entrants to evacuate the permit space immediately under any of the following conditions:

a. If the attendant detects conditions that are not authorized by the permit.

b. If the attendant detects signs and/or symptoms of hazard exposure to the entrant.

c. If the attendant detects a situation outside the confined space that could endanger the entrants.

d. If the attendant cannot effectively and safely perform all duties required.

6. In the event of an emergency, notifies the Fermilab Fire Department immediately. If a phone is immediately available, calls the Emergency Operator at Ext. 3131 or 630-840-3131. Radio communications should be used where phones are not immediately available.

7. Takes the following actions when unauthorized persons approach or enter a confined space:

a. Warns the unauthorized persons that they must stay away from the confined space.

b. Advises the unauthorized persons that they must exit immediately if they have entered a confined space.

c. Informs entrants and entry supervisor if unauthorized persons have entered the confined space.

8. Performs non-entry retrievals if trained on equipment.

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9. Performs no duties that might interfere with the attendant's primary responsibility of monitoring the entrants.

3.6 Authorized Entrant

1. Knows the hazards that may be encountered during entry, including information on the mode, signs and/or symptoms, and consequences of exposure.

2. Uses safety equipment properly. This may include air monitoring because of space configuration or work activity performed.

3. Communicates with attendant as necessary to enable the attendant to monitor entrant status and enable the attendant to evacuate the space as required.

4. Alerts attendant whenever:

a. The entrant recognizes any warning sign and/or symptom of exposure to a dangerous situation.

b. The entrant detects a prohibited condition.

5. Exits from the confined space as quickly as possible whenever:

a. An order to evacuate is given by the attendant or entry supervisor.

b. The entrant recognizes any warning sign and/or symptom of exposure to a dangerous situation.

c. The entrant detects a prohibited condition.

d. An evacuation alarm is activated.

NOTE: Any qualified individual may fill one or more of the roles mentioned above as long as that person is trained and equipped for each role (an attendant may not simultaneously serve as an entrant during an entry operation).

3.7 Fermilab Fire Department

1. Shall perform entry-required rescues from confined spaces.

2. Shall annually perform confined space rescue drills.

3. Each member of the Fermilab Fire Department shall be trained to perform the assigned rescue duties and shall be provided with, and be trained to use properly, the personal protective equipment and rescue equipment necessary for making rescues from permit spaces. In addition, each member

Fermilab ES&H Manual 4230-9 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 3/2025 of the Fermilab Fire Department shall be trained in basic first aid and in cardiopulmonary resuscitation (CPR). At least one member at the rescue scene must hold current certification in first aid and in CPR.

3.8 Subcontractors

1. If a subcontractor is required to enter a permit-required confined space as part of their contract with Fermilab, the subcontractor shall provide the Fermilab CC/TM/SC with the following information to allow for adequate review prior to entry:

a. A written copy of their confined space entry program.

b. Training records for potential entrants, attendants, and entry supervisors.

c. Evidence that all air monitoring equipment is properly calibrated within the calibration period specified by the subcontractor's program or manufacturer's instructions. This may be in the form of a calibration log, certification indicator on the instrument, or other means. (It is imperative that the equipment used by the subcontractor be capable of monitoring for the contaminants associated with the confined space to be entered.)

2. It will be the subcontractor's responsibility to provide all their own personal protective equipment

(PPE), such as lifelines, harnesses, respirators, tripods, ventilators, etc., as specified by the entry permit.

3. In addition to complying with the permit space requirements listed above, each subcontractor retained to perform permit space entry operations shall:

a. Obtain any available information regarding permit space hazards and entry operations from Fermilab.

b. Coordinate entry operations with Fermilab, when both Fermilab personnel and subcontractor personnel will be working in or near permit spaces.

c. Prior to entry, inform Fermilab Construction Coordinator/Task Manager/Service Coordinator of the specific permit space procedures the subcontractor will follow.

d. Inform the Fermilab Construction Coordinator/Task Manager/Service Coordinator prior to entering the space.

e. Inform Fermilab Construction Coordinator/Task Manager/Service Coordinator of any unanticipated hazards confronted during the confined space entry.

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f. Provide the Fermilab Construction Coordinator/Task Manager/Service Coordinator with a copy of the subcontractor's confined space permit, reclassification form or written certification once the work has been completed.

4. Per OSHA 1910.146 (c) (5), if the subcontractor can demonstrate that continuous forced air ventilation alone is sufficient to maintain safe entry conditions, then the job specific confined space entry procedures can be modified by the D/S/P DSO.

4.0 PROCEDURES

4.1 General Requirements

1. The ES&H Division shall evaluate workplaces to determine if any spaces fit the definition of a confined space. The inventory of confined spaces shall be documented in the Confined Spaces Database on the ES&H website.

2. The Landlord, in conjunction with the Functional Landlord(s), of the confined space shall conduct a hazard assessment of confined spaces to determine if they are permit-required confined spaces.

The ES&H Division Industrial Hygiene Group will provide assistance as needed.

3. Permit-Required confined spaces that can be easily or inadvertently entered must be labeled with a sign outside the space that states, DANGER – PERMIT-REQUIRED CONFINED SPACE, DO NOT ENTER or other similar language. Other confined spaces which require keys, tools, or special procedures to enter, do not have to have signs posted outside them, as long as equally effective arrangements are made to prohibit unauthorized entry (training, special procedures, etc.).

4. The ES&H Division shall evaluate the confined space entry program on an annual basis against the requirements defined in Fermilab’s program and document this evaluation in iTrack.

4.2 Permit-Required Confined Space Entry Procedures

Listed below are the requirements for permit-required confined space entry for Fermilab employees and scientific users.

1. Assign roles of entry supervisor, attendant, entrant.

2. Assure that there is at least one attendant outside the permit space, into which entry is authorized, for the duration of entry operations. The attendant may not monitor more than one confined space entry unless the Fermilab permit is amended to establish the means and procedures needed to enable the attendant to respond to one or more of the confined spaces.

https://www-esh.fnal.gov/pls/apex/f?p=112:2:8856856510629:::::

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3. The confined space entry team (i.e., entry supervisor, attendant, and entrant) identifies and evaluates the hazards of the confined space before entry and indicates on the permit the potential hazards and protective measures needed. They include, but are not limited to:

Lockout/Tagout. All energy sources which are potentially hazardous to confined space entrants shall be secured, relieved, disconnected and/or restrained as per FESHM Chapter 2100 before personnel are permitted to enter the confined space.

Pipelines or similar conveyances carrying any hazardous liquids or gases between the confined space and point(s) of isolation from any hazard shall be drained, cleaned or flushed of such materials as necessary to assure safety. The pipelines may be isolated by blocking, blinding or disconnecting.

NOTE: In confined spaces where complete isolation is not possible, provisions shall be made for as rigorous an isolation as practical. Provisions shall be noted on the entry permit, or the hazard analysis if applicable.

Ventilation shall be maintained during the occupancy of a confined space where there is a potential for the atmosphere to move out of an acceptable range. Natural ventilation is acceptable if it is determined by the entry supervisor to achieve adequate results.

Personal protective equipment, i.e., gloves, coveralls, respirators, hard hats, footwear, etc. shall be available and required for use, when needed. Personal protective equipment needed for a confined space entry will be based on the work that will be accomplished and the hazard.

Appropriate retrieval equipment to facilitate entry and non-entry rescues shall be used whenever an authorized entrant enters a permit space. This equipment typically includes a full body harness attached by a retrieval line to a mechanical retrieval device or to a fixed point outside the permit space. Exceptions exist to this requirement if the use of retrieval equipment would increase the overall risk of entry or would not contribute to the rescue of the entrant, or the entry point into the confined space cannot accommodate a retrieval system. All entrants are required to wear a full body harness, even if it is not attached to a retrieval line.

Hazardous Atmosphere Potential atmospheric hazards shall be identified before entry. These routinely include oxygen deficiency, flammability, carbon monoxide, and hydrogen sulfide.

Other toxic chemicals are added as needed. The atmosphere must be tested before entry and continuously during entry to ensure it is within acceptable limits. Monitor readings shall be recorded on the entry permit at a minimum of once an hour. Acceptable atmospheric conditions for entry are:

(i) Oxygen - 19.6% to 23.4% (separate requirements are applicable to designated oxygen deficiency hazard (ODH) areas in Chapter 4240).

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(ii) Flammability - Less than 10% of the Lower Explosive Limit (LEL).

(iii) Toxicity - Carbon monoxide in a confined space is no more than 25 parts per million

(ppm) and Hydrogen sulfide in a confined space is no more than 5 ppm.

NOTE: Contact the Landlord DSO or ES&H Division Industrial Hygiene Group for limits on other toxic chemicals.

Barriers Barriers shall be in place to protect entrants from external hazards.

Welding/Burning/Brazing Permit The fire extinguishers required for this permit must be placed outside of the confined space. All burn permits must be issued by the Fire Department.

4. Entry supervisor assures all attendants and entrants are trained.

5. Entry supervisor informs authorized entrants and attendants of the required safety equipment and their proper use.

6. Entry supervisor verifies, by checking that the appropriate information has been entered onto the permit, that all tests specified on the permit have been conducted, and that all procedures and equipment specified by the permit are in place before approving the permit and allowing entry to begin.

7. The attendant performs air monitoring before entry and continuously during entry for atmospheric and other hazards associated with the confined space. The attendant shall record monitoring results on the permit at a minimum of once an hour. The entrant(s) may also be required to perform continuous monitoring for the hazards associated with the confined space when the attendant is unable to monitor the immediate vicinity of the workers within the confined space.

NOTE: The oxygen sensor in the MSA Altair 5X is susceptible to interference by helium. When there is a potential for the presence of helium in the atmosphere, the confined space must also be monitored prior to entry and continuously thereafter with an RKI personal oxygen monitor. Use the clip to drop or insert the meter into the confined space. The oxygen sensor in the RKI personal oxygen monitors is not susceptible to helium interference.

8. The entry supervisor shall authorize the permit before entry. The Directorate/Division/Project

DSO is required to approve the permit before entry. If a written approval is not practical, a verbal approval, text message or email may be given and so noted on the permit.

9. The DSO and Fermilab Fire Department shall be notified prior to entry. Record the full name, as well as the date and time, of the contact on the permit form.

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10. The entry supervisor determines, whenever responsibility for confined space entry operation is transferred to another entry supervisor, that entry operations remain consistent with terms of the entry permit and that acceptable entry conditions are maintained.

11. The attendant must keep in constant communication with the entrant(s).

12. The attendant shall order the entrant(s) to evacuate the confined space immediately when there are:

a. Condition(s) which is/are not allowed in the permitted space.

b. Observed signs/symptoms of hazard exposure.

c. Any situation outside of the space which could endanger the entrants.

d. Sudden uncontrolled hazards within the confined space.

13. When evacuation is required due to any of the above conditions, the entry supervisor shall be notified and shall cancel the entry authorization. The entry supervisor shall notify the DSO.

Re-entry will not be permitted without the written approval of the DSO or designee.

14. In the event of an emergency, the attendant will contact the Emergency Operator. If a phone is immediately available, the Operator can be reached by dialing extension 3131 or 630-840- 3131. If a phone is not immediately available, radio communications shall be used. It is imperative that the attendant never enters a confined space to attempt a rescue. In the event of a rescue situation, the attendant's main role shall be to summon help.

4.3 Entry Permits

Listed below are the requirements for filling out confined space entry permits for Fermilab employees and scientific users.

1. The entry supervisor shall complete all fields of the permit. Additional check-off items may be added to the permit as needed.

2. The duration of the permit will be for the length of the job, so long as the conditions remain the same.

3. If unacceptable conditions arise, the attendant will order an evacuation and inform the entry supervisor. The permit will be canceled, and a reevaluation will be required by the DSO.

4. All significant identifiable hazards shall be listed on the permit.

5. If there is a shift change or multiple day jobs or change in entrants/attendants, a roster of entrants/attendants shall be attached to the permit if more space is needed.

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6. Air monitoring results shall be recorded once per hour, at minimum, on the permit.

7. In some instances, a confined space entry permit may be used in place of a hazard analysis if ALL hazards can be addressed in the permit.

8. At the completion of entry operations, confined space permits shall be forwarded to the

ES&H Division(MS 119) and retained for 75 years.

4.4 Confined Space Reclassification Process

1. A space classified as a Permit-Required Confined Space may be temporarily reclassified as a Non-

Permit Confined Space by an individual trained in confined space entry after the following provisions have been met:

a. No actual or potential atmospheric hazard exists (determined following initial atmospheric testing).

NOTE: The oxygen sensor in the MSA Altair 5X is susceptible to interference by helium. When there is a potential for the presence of helium in the atmosphere, the confined space must also be monitored prior to entry with an RKI personal oxygen monitor, which are available from the ES&H Division Industrial Hygiene Group.

b. All other recognized serious safety or health hazards must not be present or can be eliminated without entry into the space.

NOTE: If it is necessary to enter the permit space to eliminate hazards, such entry shall be performed following permit-required confined space entry procedures. If testing and inspection during that entry demonstrates that the hazards within the permit space have been eliminated, the permit space may be reclassified as a non-permit confined space for as long as the hazards remain eliminated.

c. The basis for determining that all hazards have been eliminated must be documented using the Confined Space Reclassification Form from the ES&H website.

NOTE: Reclassification status may be maintained for the duration of the entry if the hazards remain eliminated. In the event a change in conditions is identified or suspected by those working inside the space, the space shall immediately be evacuated. The confined space will be considered a Permit- Required Confined Space until deemed otherwise through re-evaluation.

2. The DSO and the Fermilab Fire Department shall be notified prior to entry. Record the full name, as well as the date and time, of the contact on the reclassification form.

3. At the completion of entry operations, confined space reclassification forms shall be forwarded to the ES&H Division (MS 119) and retained for 75 years.

Fermilab ES&H Manual 4230-15 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 3/2025

4.5 Training for Confined Spaces

Fermilab employees and scientific users who are involved in confined space entries shall receive training (TRAIN class # FN000003/CR/OJ) prior to initial entry into a confined space. A refresher class is required every three years. Additional training shall also be provided whenever there is reason to believe there are inadequacies in the employee's knowledge. All training records shall be entered into TRAIN.

Training shall include a review of:

1. The Fermilab Confined Space policy and procedures, as well as other applicable environment, safety and health procedures.

2. Hazards associated with confined space entry.

3. Signs and symptoms that may be present during or after an exposure to a hazard.

4. Consequences of exposure to potential hazards.

5. Methods of communication/contact.

6. When to initiate self-evacuation.

7. External safeguards that may be needed for safe entry.

8. Audio alarms and what the alarms mean (fixed alarms).

9. How to deal with unauthorized personnel.

10. Monitoring methods, techniques and instructions on the use of approved monitoring devices.

11. Emergency response procedures, i.e., exit when attendant instructs, when alarms are activated, call 3131or 630-840-3131 for help, etc.

12. Proper method and procedure for completing the entry permit.

13. Justification for, and instructions on, the proper use and wearing of personal protective equipment.

14. Instructions on how a confined space is identified and classified.

15. Proper use of retrieval equipment (if applicable).

Fermilab ES&H Manual 4230-16 WARNING: This manual is subject to change. The current version is maintained on the ES&H Division website. Rev. 3/2025

5.0 REFERENCES

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Values

(TLVs®) for Chemical Substances and Physical Agents, and Biological Exposure Indices (2025)

Occupational Safety and Health Administration (OSHA) 29 CFR Part 1910 Section 146 – Permit-

Required Confined Spaces

OSHA 29 CFR Part 1926 Subpart AA – Confined Spaces in Construction

OSHA 29 CFR 1910 Subpart Z – Toxic and Hazardous Substances – Permissible Exposure Limits

5.0 REFERENCES