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A=COM 4.19.1 Neutralization refers to the on-site neutralization of the cylinder contents through a controlled chemical reaction process. Specialized equipment may be necessary based on the chemical involved, as well as reaction by-products, catalysts, or physical conditions(i.e.,temperature, acidic, basic, etc.). Neutralization activities will be performed in accordance with the following procedures: • Neutralization is the required disposition method for cylinders containing acid gases, as well as many alkaline gases. • The neutralization process shall be approved by a professional engineer(e.g., chemical)or based on a published chemical-specific neutralization methodology. • Liquid levels in the reaction vessels will be maintained at least 12 inches (30.5 centimeters) below the top of the vessel. • Based on the specific chemical reaction, the temperature of the reaction vessel and its contents will be monitored continuously and controlled accordingly. • Pressure levels will be maintained within acceptable limits to prevent the reaction from accelerating, unwanted by-product formation, or the break-through of the chemical intended to be neutralized. • Employees involved in neutralization activities shall be appropriately trained and wear the PPE identified within the site-specific safety plan and cylinder plan. 4.20 Detonation 4.20.1 Detonation refers to the use of explosives to open and subsequently consume the contents of the cylinder by the heat generated during the explosion. Detonation activities will be performed in accordance with the following procedures: • All personnel involved with detonation 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.). • A detonation plan shall be submitted to and approved by the SH&E Manager prior to the commencement of cylinder detonation activities. • The detonation of compressed gas cylinders will be completed under the guidance of experienced ordnance and explosives (OE)professional who is licensed in the use of explosives. • A sufficient amount of explosives will be used to consume the entire contents of the cylinder (flammable gases only). • A blast pit will be excavated where all detonations will take place. • The OE professional will determine the blast hazard zone/potential debris impact zone, and this area will be evacuated prior to the detonation. • The OE professional will sound a warning signal (e.g., horn or equivalent)three times to indicate that a detonation is imminent and confirm all persons have evacuated the blast hazard zone prior to detonation. • Employees will be on standby outside the blast hazard zone with fire extinguishers(minimum rating of 20A:100B:C). 4.21 Cylinder Decommissioning Operations 4.21.1 Decommissioning refers to the removal of a compressed gas cylinder from service by rendering it permanently unusable. 4.21.2 Prior to decommissioning, cylinder contents will be verified, removed from the cylinder, and the cylinder purged with an inert gas(e.g., nitrogen, carbon dioxide, etc.). 4.21.3 All identifying marks or decals will be removed from the cylinder. Compressed Gases(S3AM-114-PR1) Revision 3 September 30,2020 PRINTED COPIES ARE UNCONTROLLED. CONTROLLED COPY IS AVAILABLE ON COMPANY INTRANET. 11 of 12