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A=COM 4.16.9 An SH&E Manager shall be contacted during the planning stages of a cylinder disposition and decommissioning effort in order to determine whether a site-specific cylinder plan is required. 4.17 Venting to the Atmosphere 4.17.1 Cylinders that contain non-flammable, non-toxic materials can be vented to the atmosphere.All venting activities will be performed in accordance with the following procedures: • Atmospheric venting will be accomplished at a remote location and in compliance with all applicable environmental air regulatory requirements. • Atmospheric venting activities will be completed in a Level B Ensemble(unless otherwise specified in the site-specific safety plan and cylinder plan). • Venting activities will be dependent upon a wind direction that does not carry the outgas plume in the direction of an adjacent public structure. • The cylinder will be properly grounded to confirm a static charge is not generated, potentially resulting in ignition of a flammable gas. • All tools used on the cylinder will be non-sparking. • Low-pressure discharging will not exceed 15 pounds per square inch gauge(psig). • Once discharging has started, all workers will retreat to the exclusion zone (minimum 100 feet) around the remote location until the discharging process is complete. 4.18 Flaring 4.18.1 Flaring activities involve the combustion of the cylinder contents through the discharge of a low- intensity flame. Flaring activities will be performed in accordance with the following procedures: • Flaring will be accomplished at a remote location and in compliance with all applicable environmental air regulatory requirements. • All personnel involved with flaring activities shall be appropriately trained and wear PPE appropriate to the hazards(e.g. Nomex fire-retardant forearm-length gloves, other fire- retardant clothing, self-contained breathing apparatus, etc.). • Flaring activities will be dependent upon a wind direction that does not carry the combustion plume in the direction of any offsite structure or activity, or into uncontrolled (public access) areas. • The cylinder will be properly grounded to confirm a static charge is not generated, potentially resulting in ignition of a flammable gas. • All tools used on the cylinder will be non-sparking. • Low-pressure discharging will not exceed 15 pounds per square inch gauge (psig). • A hot work permit shall be completed prior to the start of flaring activities, refer to S3AM-332- PR1 Hot Work. • No other cylinders will be within 50 feet(15.24 meters)of the cylinder being flared. • Flaring activities will use a low-pressure discharge and maintain a small, low-intensity flame. • A firewatch will be established,with a worker stationed outside the exclusion zone with a fire extinguisher(20A:10013:C)during flaring activities(i.e., fire watch). During the work the worker assigned to the firewatch will have no other duties. • The flare will be positioned so that it is not pointing toward any flammable materials, persons, or equipment in the immediate area. 4.19 Neutralization Compressed Gases(S3AM-114-PR1) Revision 3 September 30,2020 PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 10 of 12