EMP 2022 FINAL WEBSITE Version

Emergency Management  EMG‐PRO‐001, Management of Gas Emergencies  Issued: 23 Mar 22    Centra Administrative and Field personnel contact information can be found in EMG‐PRO‐001A10 of the  Emergency Management Program.  Specific duties and responsibilities are outlined in the Internal  Emergency Response Roles section of this Procedure.    3.3. Emergency Response Agencies Emergency Response Agencies in Minnesota, Manitoba and Ontario can be contacted by dialing 911.  If  necessary Emergency Response Agencies can also be contacted using the direct dial numbers listed in  EMG‐PRO‐001A10 of the Emergency Management Program.  3.4. Regulatory Agencies A preliminary and detailed incident report shall be submitted to the CER using the CER Event Reporting  System and in accordance with the CER Event Reporting Guidelines and Section 3.4.3.  If the online  event reporting system is not available, notification shall be made using the TSB Reporting Hotline.  Initial reports of incidents must be made to PHMSA and MnOPS using the phone numbers listed  below as soon as practicable, but no later than 1‐hour following the confirmed discovery of an incident.  The initial report must include:  1. Names of operator and person making report and their telephone numbers.  2. The location of the incident.  3. The time of the incident.   4. The number of fatalities and personal injuries, if any.   5. All other significant facts that are known by the operator that are relevant to the cause of the  incident or extent of the damages.    Revision or confirmation of the incident must be made within 48‐hours after the confirmed discovery of  the incident.  The confirmation will include updates on the information previously provided in the initial  report along with an estimate of the amount of natural gas released.     All pertinent data shall be recorded.  Photograph damaged items if possible.  Transportation of materials  for analysis shall be documented on a Custody Transfer Record and as appropriate evaluated using the  Metallurgical Evaluation Protocol as a guide.  Incident Definitions  Incidents are defined by the various regulatory agencies as follows:  3.4.1. PHMSA An incident is required to be reported to the DOT in Washington, D.C. and Minnesota Office of Pipeline  Safety if it meets any one or more of the following criteria:    EFG’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT.  UNCONTROLLED WHEN PRINTED.    Page 45 of 53   

Emergency Management  EMG‐PRO‐001, Management of Gas Emergencies  Issued: 23 Mar 22    1. An event that involves a release of a gas from a pipeline, gas from an underground natural gas  storage facility (UNGSF), liquified natural gas, liquified petroleum gas, refrigerant gas, or gas  from an LNG facility, and that results in one or more of the following consequences:  a. A death, or personal injury necessitating in‐patient hospitalizations;  b. Estimated property damage of $122,000 or more, including loss to the operator and  others, or both, but excluding the cost of gas lost.  For adjustments for inflation  observed in calendar year 2021 onwards, changes to the reporting threshold will be  posted on PHMSA’s website.  These changes will be determined in accordance with the  procedures in appendix A to part 191.  c. Unintentional estimated gas loss of three million cubic feet or more.   2. An event that results in an emergency shutdown of an LNG facility or a UNGSF.  Activation of an  emergency shutdown system for reasons other than an actual emergency within the facility  does not constitute an incident.   3. An event that is significant in the judgement of the operator, even though it did not meet the  criteria of paragraph (1) or (2) of this definition.     All pertinent data shall be recorded.  Photograph damaged items if possible.  3.4.2. MnOPS A release of natural gas causing any of the following.    1. Evacuation of 10 or more people.  2. Evacuation of a school, hospital or health care facility.  3. Rerouting of traffic or closing a highway by public emergency responders.  4. 50 or more customers out of service.  5. Media attention.  6. Unintentional fire or explosion.  7. “Reportable Incident” as defined by PHMSA  3.4.3. Canadian Transportation Safety Board (TSB)/CER An occurrence that results in any one or more of the following cases:  1. A person is killed or sustains a serious injury;  2. The safe operation of the pipeline is affected by   a. damage sustained when another object came into contact with it, or  b. a fire or explosion or an ignition that is not associated with normal pipeline operations;  3. An event or an operational malfunction results in   a. an unintended or uncontrolled release of gas,  b. an unintended or uncontrolled release of HVP hydrocarbons,  c. an unintended or uncontained release of LVP hydrocarbons in excess of 1.5 m3, or  d. an unintended or uncontrolled release of a commodity other than gas, HVP  hydrocarbons or LVP hydrocarbons;    EFG’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT.  UNCONTROLLED WHEN PRINTED.    Page 46 of 53   

Emergency Management  EMG‐PRO‐001, Management of Gas Emergencies  Issued: 23 Mar 22    4. There is a release of a commodity from the line pipe body;  5. The pipeline is operated beyond design limits or any operating restrictions imposed by the  Canada Energy Regulator;  6. The pipeline restricts the safe operation of any mode of transportation;  7. An unauthorized third‐party activity within the safety zone poses a threat to the safe operation  of the pipeline;  8. A geotechnical, hydraulic or environmental activity poses a threat to the safe operation of the  pipeline;  9. The operation of a portion of the pipeline is interrupted as a result of a situation or condition  that poses a threat to any person, property or the environment; or  10. An unintended fire or explosion has occurred that poses a threat to any person, property or the  environment. All incidents and occurrences as defined under the Onshore Pipeline Regulations,  and Canada Labour Code, Part II should be reported to the TSB Occurrence Hot Line at 819‐997‐ 7887.    NOTE: See Section 5 of the CER Event Reporting Guidelines for additional information to help determine  if events meet the above criteria.  Where regulations require an event to be reported immediately the following shall be considered to  determine whether an event meets any of the following definitions:   An Incident that Harms People or the Environment:   o a death;  o a serious injury (as defined in the OPR or TSB regulations);  o an unintended or uncontrolled LVP hydrocarbon release in excess of 1.5 m³ that leaves  company property or occurs on or off the right of way;  o an unintended or uncontrolled sweet natural gas or HVP release >30,000 m³;  o any unintended or uncontrolled release of sour natural gas or hydrogen sulfide; and/or  o a significant adverse effect on the environment.   A Rupture:   o an instantaneous release that immediately impacts the operation of a pipeline segment  such that the pressure of the segment cannot be maintained.   A Toxic Plume:   o a band of service fluid or other contaminant (e.g. hydrogen sulfide or smoke) resulting  from an incident that causes people, including employees, to take protective measures  (e.g. muster, shelter‐in‐place or evacuation).  Where an event meets any of the above definitions, notify the TSB Reporting Hotline at (819) 997‐7887.  Subsequently, the company is required to input the details required by both the TSB (see TSB  regulations) and the CER into the Online Event Reporting System (OERS). The phone notification and the  input of information into OERS are required to occur as soon as possible and no later than three hours  of the incident being discovered.    EFG’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT.  UNCONTROLLED WHEN PRINTED.    Page 47 of 53   

Emergency Management  EMG‐PRO‐001, Management of Gas Emergencies  Issued: 23 Mar 22    For events that do not meet any of the definitions above, it is not required to phone the TSB Reporting  Hotline but must report the event as soon as possible and no later than twenty‐four hours after the  event was discovered.    If multiple incident types occur as a result of a single occurrence report those incident types under a  single incident report.    Examples of situations where this might be the case include but are not limited to:   a pipeline rupture (occurrence) where there is a release of gas (incident type) and an explosion  (incident type);   an industrial accident (occurrence) that causes a death (incident type), a serious injury (incident  type) and a fire (incident type);   an operational malfunction (occurrence) that causes an overpressure (incident type) and a  release of product (incident type); or   an operational malfunction (occurrence) that causes several concurrent or immediately  consecutive overpressures (incident types).  In cases where an incident has occurred, and a second incident occurs during the response to the initial  incident (e.g. a fire occurs during the clean‐up of a spill), the second incident is considered distinct and  should be reported separately.  Incident Costs  Costs for any incident that meets the following definition under any of the CER’s regulations are to be  reported to the Board as described below:  1. An unintended or uncontrolled release of low‐vapour pressure (LVP) hydrocarbons in excess of  1.5 m³ that extends beyond a company’s property;  2. Significant adverse effect on the environment;  3. rupture;  4. A toxic plume; and/or  5. loss of containment of any fluid from a well.  Companies will be expected to report categorized costs related to the incident as follows:   Category 1 – Actual costs (to be reported separately) related to:   o The emergency response, including containment of the incident;  o The clean‐up and remediation of the incident; and  o The repair or replacement of regulated facilities.   Category 2 – Actual or estimated value of losses or damages not included in Category 1.  Companies are expected to provide the above costs annually (calendar) beginning the year the incident  was reported and ending either when there are no further costs related to the incident or 5 years after  the incident was reported (inclusive of the year that is was reported), whichever occurs first.  Reporting of costs will be integrated into the OERS at a later date and at that time OERS will  automatically determine when companies are required to report costs. However, until the system  changes are made, the CER will contact companies on an as‐needed basis and will provide instructions  and a standard form to report costs.      EFG’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT.  UNCONTROLLED WHEN PRINTED.    Page 48 of 53   







Emergency Management    EMG‐PRO‐001, Management of Gas Emergencies  Issued: 23 Mar 22  4. Emergency Management Program Continuous Review and Improvement The EMP is a living document that must be continuously monitored for changes that may be required in  procedures and stakeholder information and resources.  To accomplish this, Centra personnel will  consider potential changes that may be required in the EMP because of something that may have been  observed or learned in the day to day performance of their duties.  Any potential changes shall be  communicated to the Manager, Pipeline Operations in writing.  Minor changes such as changes in  stakeholder contact information or resources can be submitted for revision without further evaluation.   More significant changes, such as changes in roles, responsibilities and procedures must be reviewed  and evaluated by operations personnel and submitted to the Director, Pipeline operations on a  Management of Change form (Instructions)for approval.  In addition to the continuous monitoring as described above, the EMP will be formally reviewed on an  annual basis by operations staff.  This review is intended to ensure that operations personnel are  familiar with the contents and requirements of the EMP and to determine if any other changes or  revisions may be required.  As a part of the annual review, contact and resource information for all  stakeholders shall be confirmed:     Centra personnel contact information, material and equipment availability   Emergency Response Agency (Fire, Police, Ambulance, Emergency Management Agencies)  contact information and resources   Contractor contact information, qualified personnel, material and equipment availability   Customer contact information   Regulatory agency contact information, changes in regulatory requirements  Changes to the EMP shall be made in accordance with the previous paragraph.   5. Training and Coordination of Resources Centra personnel are trained in accordance with the Operator Qualification Program to ensure that they  have the necessary knowledge and technical skills to perform the tasks that may be required when  responding to an emergency condition on Centra’s system.    Centra personnel will meet with other stakeholders to:  1. Familiarize them with the requirements of the EMP and the hazards that may exist when  responding to an emergency involving Centra facilities.  2. Establish the responsibilities and resources of each of the stakeholders and how to coordinate  those resources in the event of a pipeline emergency to minimize hazards to life or property.  Because each stakeholder will have different roles and responsibilities in the event of an emergency,  training materials and/or informational materials will be developed that are tailored to each stakeholder  audience.  The general focus of the information is outlined below:    EFG’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT.  UNCONTROLLED WHEN PRINTED.    Page 52 of 53   

Emergency Management    EMG‐PRO‐001, Management of Gas Emergencies   Issued: 23 Mar 22  Gas Control  o Receiving emergency notifications  o Communications   Emergency personnel   Customers  o Gas Control priorities  o Documentation  Informational materials: EMP, Gas Control PowerPoint presentation   Emergency Response Agencies  o EMP review  o Minimizing hazards to life and property  o Roles and responsibilities  Informational materials: EMP, Pipeline Emergency Video, Emergency Responder PowerPoint  presentation   5.1. Table Top and Mock Emergencies Table top and mock exercises shall include operational elements of Centra’s management and  protection programs to anticipate, prevent, mitigate and manage conditions that may adversely affect  the safety and security of Centra’s pipelines, employees, the public, as well as property and the  environment.  5.1.1. Table Top Emergency Exercise Table top emergency exercises will be conducted on an annual basis to simulate various emergency  scenarios that could potentially occur on the transmission system.  While it is not necessary to conduct  table top exercises for all stakeholder groups, they should be conducted with Centra personnel on an  annual basis and with Emergency Response Agencies as part of the periodic liaison agenda.    5.1.2. Mock Emergency Exercise A Mock Emergency Exercise is an in‐depth enactment of a simulated emergency response scenario that  includes the participation of all stakeholders and may include the public.  The purpose of conducting a  mock emergency exercise is to further the knowledge of stakeholders with respect to what their roles  and responsibilities are when responding to an emergency on the transmission facilities. It is also a tool  used to evaluate the effectiveness of the EMP and its implementation.  Centra will conduct a mock  emergency every 3 years.    EFG’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT.  UNCONTROLLED WHEN PRINTED.    Page 53 of 53   

Emergency Management  Revision 3 EMG‐PRO‐002, Management of Non‐Gas Emergencies  Issued: 14 Dec 20    EMG‐PRO‐002, Management of Non‐Gas Emergencies  1.0  Purpose  Emergency preparedness and response planning is intended to ensure that responses to  emergencies are prompt, organized and effective.  This procedure provides and identifies  processes for responding to various emergencies to help ensure the safety of employees,  contractors and the public, and that company assets and the environment are protected.  2.0  Scope  This procedure applies to all areas of Centra Pipelines (Centra ‐ which includes Centra  Transmission Holdings, Inc., and Centra Pipelines Minnesota, Inc.), operations, except for  emergencies that are related to the transmission of natural gas.  It also applies to all Centra  employees and, contractors and visitors within Centra areas of operation.  3.0  Definitions  For purpose of this procedure, Emergency means a present or imminent event that requires  prompt coordination of actions or special regulation of persons or property to protect the  health, safety or welfare of people or to limit damage to property or the environment.  There  are many different events that can create emergencies involving Centra operations.  Those  events could be the result of:  1. Human Activities – excavation, accidents, vandalism, terrorism, threats, working with  chemicals, etc.  2. Acts of Nature – tornadoes, floods, wildfires, severe summer or winter weather conditions,  etc.  3. Equipment/material failure – buildings, mobile equipment, tools and equipment, improper  installation or operation, etc.  A reportable communicable disease is a disease that can be transmitted from person to  person, and by law must be reported to the applicable public health authority, e.g., measles,  mumps, tuberculosis, hepatitis A, etc.      CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    Page 1 of 7 

Emergency Management  Revision 3 EMG‐PRO‐002, Management of Non‐Gas Emergencies  Issued: 14 Dec 20    4.0  General  Centra operating areas (office/field) shall develop emergency preparedness and response  processes to cover activities where there is a risk to the safety of employees and the public or a  risk of damage to company assets or the environment.  Such events include:   Fire and/or explosion (those not related to natural gas).   Injury or illness.   Chemical substance release.   Weather related anomalies (e.g., storms, floods, etc.).   Security threats.  5.0  Requirements   Develop appropriate emergency procedures; see References for a list of related procedures.   Also, Appendix A, Emergency Prevention, Preparedness & Response, provides additional  details.   EFG employees shall be trained in appropriate emergency response situations.   Emergency procedures shall be tested periodically to determine the level of employee  knowledge, speed of response and overall efficiency.   Maintain and post General Emergency Plans at designated sites.   Maintain lists of external first responder organizations.   Provide, place and maintain appropriate equipment and materials for emergency response.   Generate and maintain emergency related records in accordance with Centra’s master  record retention schedule.   Review emergency preparedness plans at the start of projects and a part of contractor  management.   Routinely inspect workplaces and activities.   Maintain facilities and equipment in accordance with original equipment manufacturer’s  recommendations.       CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    Page 2 of 7 

Emergency Management  Revision 3 EMG‐PRO‐002, Management of Non‐Gas Emergencies  Issued: 14 Dec 20    6.0  Responsibilities  Management   Ensure appropriate emergency procedures are developed and tested periodically.   Ensure employees are trained in emergency response processes.   Obtain and maintain appropriate equipment and materials for emergency response.   Ensure reportable events are communicated in accordance with Centra’s GEN‐PRO‐004G2,  Guide to Reportable Events.   Ensure contractors and visitors are aware of, and adhere to, Centra emergency  management requirements and directions.  Employees   Know and understand how to respond to relevant emergency processes.   Follow emergency response requirements at customer locations.   Identify and report potential and actual hazards and respond to those that are within their  capability.   Seek appropriate support for a work‐related injury/illness.  Manager, Risk Management   Provide support in the development and maintaining of emergency preparedness and  response processes.  Contractors & Visitors   Adhere to Centra requirements and directions.  7.0  References   EMG‐PRO‐001, Management of Gas Emergencies.   GEN‐PRO‐003, Risk Assessment.   GEN‐PRO‐004, Event Management.   ENV‐PRO‐008, Spill Prevention & Preparedness.   SAF‐PRO‐001, Health & Safety – General.   SAF‐PRO‐012, Fire Prevention & Preparedness.   SAF‐PRO‐018, Violence Prevention.   GEN‐WI‐001, Responding to Security Events.   Centra General Emergency Plans.   Canada Occupational Health & Safety Regulations, PART XVII Safe Occupancy of the Work  Place.    CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    Page 3 of 7 

Emergency Management  EMG‐PRO‐002, Management of Non‐Gas Emergencies  Issued: 14 Dec 20  Revision 3   9.0  Revisions  Revisions are documented and tracked as part of the Integrated Management System (IMS),  Business Documents process.  Approval of formal company documents are managed under the  IMS, Change Management process.         CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    Page 4 of 7 

Emergency Management  EMG‐PRO‐002, Management of Non‐Gas Emergencies  Issued: 14 Dec 20  Revision 3   Appendix A, Emergency Prevention, Preparedness & Response  Prevention & Preparedness  The following processes are, among other things, intended and designed to help in the  prevention of emergency events:   Policies and procedures.   Training.   Inspection.   Workplace design.   Preventative maintenance.   Hiring practices.  Response  Possible emergency situations include fire, explosion, injury or illness, a spill or leak of a  chemical substance, weather‐related situations, security threat, etc.  Centra employees shall be  familiar with the following six initial steps of an emergency response:  EVACUATE Immediately get to a safe area.  ALARM Call for help, warn others in the area.  PROTECT Consider procedures, barriers and PPE.  RESCUE Remove victims to safety, provided it can be done safely.  REVIVE Provide first aid and life‐protecting measures, as warranted.  MEDICAL ASSISTANCE Transport to advanced medical support, as warranted.    The flowchart on Page 7 of this procedure shows the emergency response process, at a high  level.    As a general rule, there are two categories of chemical substance spills:  1. An active spill, it’s live, on‐going.  2. The discovery of a spill/suspected spill, that is not on‐going and may have occurred  hours/days/weeks/months/years ago, prior to the time of discovery        CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    Page 5 of 7 

Emergency Management  EMG‐PRO‐002, Management of Non‐Gas Emergencies  Revision 3 Issued: 14 Dec 20    Appendix A, Emergency Prevention, Preparedness & Response  (Continued)  Response (Continued)  Event Occurs – Deemed an emergency.  Refer to Definitions, Emergency.  Activate First Response.   People first – life and limb over things.   Secure and control the scene.  Assess the Risk – Identifying exposure to loss.  Determine the nature and extent of the emergency:   How widespread is the emergency?  Determine if the situation is likely to spread to other  operations/locations and how soon this may occur.   Determine the risk of further emergency events or the risk of further deterioration of the  current situation.   Determine need to notify internal and external stakeholders, and proceed accordingly.  Determine resources needs.   Assess if Centra resources are available to respond and maintain core business operations  (people, equipment, materials).   Determine if alternate resources are available from another location if needed EFG  resources are not readily available.  Examine Feasibility of Options – Select apparently best option.  Initiate secondary actions:   Control hazards.   Initiate corrective actions – perhaps initially, temporary controls.   Re‐assess the situation.   Initiate secondary responders, as warranted.   Determine if an Emergency Operations Centre (EOC) is warranted, mobile or fixed.  Rectify & Remediate – Restore to normal operations.   Continue with corrective actions through to the point that the emergency can be  considered closed.   Initiate remediation activities to restore the situation to normal operations.   Repair and/or replace equipment and materials used in the emergency response and return  them to a state of readiness.  Debrief – Lessons learnt and continual improvement.   Generate formal reports and distribute accordingly (internal and external stakeholders).   Initiate any changes needed to processes as a result of debriefing outcomes.       CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    Page 6 of 7 



Emergency Management  Original EMG‐PRO‐001A1, List of Annexes  Issued: 10 Dec 21    Annex 1, List of Annexes  1.0  Purpose  This annex is a part of EMG‐PRO‐001, Management of Gas Emergencies, and simply lists the  Centra Pipelines annexes associated with emergency events within Centra’s operations.  2.0  Scope  This list of annexes applies to a combination of both EMG‐PRO‐001, Management of Gas  Emergencies, and EMG‐PRO‐002, Non‐Gas Emergencies.      CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    1 

Emergency Management  Original EMG‐PRO‐001A1, List of Annexes  Issued: 10 Dec 21    3.0  List of Annexes  Table 1, Annexes  Subject  Role/Application  EMG‐PRO‐001A1, List of Annexes  Internal use only.  Applies to applicable types of  emergencies.  EMG‐PRO‐001A2, Emergency Management Risk  Internal use only.  Assessment Summary  Applies to gas emergencies.  EMG‐PRO‐001A3, Natural Gas Curtailment  Applies to Centra customers (shippers).  Applies to gas emergencies.  EMG‐PRO‐001A4, General Facility Emergency  Internal use only.  Plans  Applies to any emergency.  EMG‐PRO‐001A5, Forms  Internal use only.  Some of these forms apply to only gas  emergencies, some apply to any  emergency.  EMG‐PRO‐001A6, Landowner Information  Internal use only.  This information is not published outside  of Centra.  EMG‐PRO‐001A7, CURRENTLY NOT ASSIGNED    EMG‐PRO‐001A8, Metallurgical Laboratory Failure  Internal use only.  Examination Protocol  Applies to gas emergencies.  EMG‐PRO‐001A9, Plan Holder List (1‐10‐2013)  Internal use only.  EMG‐PRO‐001A10, Contact Reference (mar19)  Internal use only.  EMG‐PRO‐001A11, Emergency Management  Internal use and use by/for emergency  Program Summary for Emergency Responders.  responders.  EMG‐PRO‐001A12, External Resource Manual  Internal use only.  EMG‐PRO‐001A13, Regional & Community Maps  Internal use only.  Emergency Maps  4.0  Responsibilities  Management  Maintain the list of annexes and distributes accordingly.  5.0  Revisions  Revisions are documented and tracked as part of the Integrated Management System (IMS),  Business Documents process.  Approval of formal company documents are managed under the  IMS, Change Management process.    CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    2 

Emergency Management  Original EMG‐PRO‐001A2, Emergency Management Risk Assessment Summary  Issued: 15 Dec 21    Annex 2, Emergency Management Risk Assessment  Summary  1.0  Purpose  This annex is a part of EMG‐PRO‐001, Management of Gas Emergencies, and provides screening  level risk assessment (SLRA) details on the management of gas emergencies.  2.0  Scope  This annex only addresses the outcome of the most recent SLRA as it relates to Management of  Gas Emergencies.  3.0  SLRA ‐ Management of Gas Emergencies  The current year SLRA on the Management of Gas Emergencies is shown as Appendix A. SLRA ‐  Management of Gas Emergencies.  4.0  Revisions  Revisions are documented and tracked as part of the Integrated Management System (IMS),  Business Documents process.  Approval of formal company documents are managed under the  IMS, Change Management process.      CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    1 

Emergency Management  EMG‐PRO‐001A2, Emergency Management Risk Assessment Summ Issued: 15 Dec 21    Appendix A. SLRA ‐ Management of Gas Emergen   CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT V UNCONTROLLED WHEN PRINTED.    2

mary  Original ncies    VERSION OF THIS DOCUMENT.   2 





Emergency Management  EMG‐PRO‐001A2, Emergency Management Risk Assessment Summ Issued: 15 Dec 21      CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT V UNCONTROLLED WHEN PRINTED.    4

mary  Original   VERSION OF THIS DOCUMENT.   4 





Emergency Management Original EMG-PRO-001A3, Natural Gas Curtailment Issued: 10 Dec 21 Annex 3, Natural Gas Curtailment 1.0 Purpose In the unlikely event that Centra determines the natural gas supply contained within the natural gas transmission line is insufficient to meet the total customer demands; the public interest requires that the curtailment of gas to customers be controlled in a manner which will consider customer priority consistent with guidelines established by regulatory authorities. Centra shall determine the quantity of gas which each customer shall be entitled to receive and promptly notify each affected customer regarding the curtailment and period covered. Such notice shall be given as far in advance as possible. Centra may change the curtailment period and quantity of gas the customer may be entitled to if conditions require. 2.0 Scope The Natural Gas Curtailment policy applies to all Centra customers and is premised on the fact that natural gas deliveries will be curtailed in consideration of the end-use of the natural gas. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 1

Emergency Management Original EMG-PRO-001A3, Natural Gas Curtailment Issued: 10 Dec 21 3.0 Definitions Priority 1 Customer Any person who uses natural gas or local distribution company (LDC) who resells natural gas for use in the following high priority classifications: 1. In a residence. 2. In a small commercial establishment. 3. In a school or a hospital. 4. For police protection, for fire protection, in a sanitation facility or a correctional facility. In the case of an LDC, if necessary, the volume of natural gas that LDC’s are entitled to receive shall be based on the amount of gas required to serve high-priority classifications as defined above. Examples of small commercial establishments are businesses that are primarily engaged in wholesale or retail trade, agriculture, forestry, fisheries, transportation, communications, sanitary services, finance, insurance, real estate, personal services, government, etc. Priority 2 Customer Any customer whose use of natural gas has been certified by the United States Secretary of Agriculture as an essential agricultural use unless the use of an alternative fuel is economically practicable and reasonably available as determined by Federal Energy Regulatory Commission in conjunction with the Secretary of Agriculture. Priority 3 Customer Large commercial and industrial customers primarily engaged in power production or in a process which creates or changes raw or unfinished materials into another form or product. This includes mining and manufacturing. 4.0 Revisions Revisions are documented and tracked as part of the Integrated Management System (IMS), Business Documents process. Approval of formal company documents are managed under the IMS, Change Management process. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 2

Emergency Management Original EMG-PRO-001A4 – Facility General Emergency Plans Issued: 13 Dec 21 Annex 4, Facility General Emergency Plans 1.0 Purpose This annex is a part of EMG-PRO-001, Management of Gas Emergencies, and spells out facility general emergency plan details of each facility listed. 2.0 Scope This annex applies to the facilities listed in section 3.0, General Facility Plans, and to any emergency within Centra’s operations. 3.0 General Facility Plans For each of the facilities listed below there is a detailed plan that describes its location, local emergency response agencies contact information, closest medical facility, an Emergency Evacuation Plan for specific types of possible emergencies at that location, and site and area maps showing pertinent site and emergency structures/features, evacuation assembly areas, emergency equipment, etc. The General Facility Plan for each listed facility is prominently posted at the facility. Additionally, PDF copies of each Plan is posted in SharePoint. The facilities for which a General Facility Plan exists are: • SSMS. • Emo Office & Shop. • SCS. • FFPS. • Rainy River Office. • London Office • RRCS. 4.0 Responsibilities Management Maintain and communicated the General Facility Plan process. Employees Remain cognizant of the General Facility Plan and its contents for each listed facility and its posted location. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 1

Emergency Management Original EMG-PRO-001A4 – Facility General Emergency Plans Issued: 13 Dec 21 5.0 Revisions Revisions are documented and tracked as part of the Integrated Management System (IMS), Business Documents process. Approval of formal company documents are managed under the IMS, Change Management process. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 2

Emergency Management Original EMG-PRO-001A5, Forms Issued: 18 Oct 21 Annex 5, Forms 1.0 Purpose This annex is a part of EMG-PRO-001, Management of Gas Emergencies, and identifies the forms that are used as part of the emergency management process. 2.0 Scope In addition to EMG-PRO-001, Management of Gas Emergencies, the forms in this annex also have some application to EMG-002, Non-Gas Emergencies. 3.0 Forms The following is the list of forms that make up Annex 4, Forms: • Packaging Corporation of America (PCA) Written Curtailment Notice and Return to Service Notice. • Custody Transfer Record (Materials Failure Analysis). • Emergency Response Checklist. • Emergency Tools & Equipment List. • Incident News Release, with Shelter in Place. • Incident News Release. • MERC Written Curtailment Notice and Return to Service Notice. • Natural Gas Safety Data Sheet. • Trouble Call Report & Instructions (Gas Control). • Verbal Force Majeure/Curtailment Notice. • Enbridge Written Curtailment Notice and Return to Service Notice. 4.0 Revisions Revisions are documented and tracked as part of the Integrated Management System (IMS), Business Documents process. Approval of formal company documents are managed under the IMS, Change Management process. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 1

Emergency Management Original EMG-PRO-001A6 – Landowner Information Issued: 13 Dec 21 Annex 6, Landowner Information 1.0 Purpose This annex is a part of EMG-PRO-001, Management of Gas Emergencies, and provides information in order communicate with landowners whose property the pipeline traverses. 2.0 Scope This annex encompasses registered landowners owning property within Centra’s right of way and approaches thereto. This information is confidential and is used only to allow Centra to communicate with landowners. 3.0 Procedure Periodically obtain landowner information from Provincial and State government agencies. This information is typically updated annually and is maintained in SharePoint. 4.0 Revisions Revisions are documented and tracked as part of the Integrated Management System (IMS), Business Documents process. Approval of formal company documents are managed under the IMS, Change Management process. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 1

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 Annex 8, Metallurgical Laboratory Failure Examination Protocol 1.0 Purpose This annex is a part of EMG-PRO-001, Management of Gas Emergencies, and details the protocol for conducting a metallurgical analysis of a line pipe failure to assign one or more probable causes for the failure. 2.0 Scope The protocol applies to any line pipe failure within Centra’s natural gas transmission pipeline system. 3.0 Protocol Introduction The objective of a metallurgical analysis of a line pipe failure is to assign one or more probable causes for the failure. The failure analysis may identify issues that must be remediated to ensure the integrity of other sections of the failed line pipe as well as other pipeline segments with similar characteristics (i.e., pipe manufacturer, seam type, grade, other specifications, coating type, and environmental conditions). This protocol specifically addresses the failure analysis of line pipe. Failure analysis of pipeline appurtenances (such as valves, flanges, bolts, etc.) may use the same methodologies as those outlined herein, but a unique test plan should be developed to handle the unique characteristics of the appurtenance. Besides a metallurgical analysis of the line pipe, the internal and external environment of the line pipe must be considered to arrive at the causal factors that may have caused the line pipe to fail. Therefore, the presence of corrosion products inside and outside the line pipe in the area of the failure must be considered and collected for analysis, as appropriate. For example, soil in the immediate area of the failure, dislodged soil adjacent to the ejected pipe, and soil that had adhered to the line pipe may have to be collected for analysis. Photographic documentation of the failed section of line pipe prior to its departure from the accident site and upon its arrival at the testing facility must be available to ensure any damage from mishandling is appropriately noted. Before the shipment of the failed section, proper preservation techniques for the fracture surfaces and the section (including coating), if required, should be identified (such as Visqueen®, SaranWrap®, oils, and other protective covers), and a chain of custody should be established for transfer of the failed section to the testing facility. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 1

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Introduction (Continued) Before the failed section arrives at the testing facility, it should be determined if destructive testing of the failed section has been approved. Only non-destructive testing is allowed in some instances to preserve the pipe intact for evidentiary purposes. In some instances, destructive testing can only occur when all interested parties agree to its necessity and a consensus protocol can be crafted establishing those that can witness the destructive tests. A typical sequence of analysis is discussed in this document. Engineering decisions must be made during any failure analysis, and the results of each step dictate the next procedure to be performed. The need for other tests to be performed is a determination that should be made during the course of the investigation. In this instance, the proposed test plan should be modified to reflect these changes. It is a waste of resources to routinely perform a test or analysis that has no relevance to the failure. The following steps are suggested as guidance. • Background information • Visual and non-destructive examination • Physical measurements • Corrosion examination • Fractography examination • Metallographic examination • Mechanical properties CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 2





Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Table 1 – Background Information Data Sheet (fill in all applicable fields) (Continued) Sketch a schematic of the failure area showing direction of flow and other prominent features: CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 5

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Visual and Non-destructive Examination 1. Photographically document the pipe in the “as-received” condition before initiating the metallurgical analysis. Documentation may include the following: • Fracture area and surface. • Seams. • Girth welds. • Coating condition. • Anomalies. • Manufacturing flaws or defects. • Pitting and/or evidence of corrosion on internal and external pipe surfaces. 2. Perform visual examination of the internal and external pipe surfaces in the “as-received” condition, and document any anomalies that may be present in the pipe such as the following: • Cracks. • Crevices. • Dents. • Bends. • Buckles. • Gouges. • Manufacturing defects. • Wrinkles, tents or damage to the coating. • Pitting and/or evidence of corrosion on internal and external pipe surfaces. • Presence of corrosion products and/or deposits . • Describe coating, and coating damage (disbonding) if any, in the vicinity of fracture origin and at other locations in the failed pipe sample. • Describe any internal coating or linings (if used). • Examine the pipe sample surface for evidence of stress corrosion cracking. • Examine for evidence of arc burns, excessive grinding around the surface area near the crack. • If corrosion is evident, collect corrosion products for analysis. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 6

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Visual & Non-destructive Examination (Continued) 3. Collect solid and liquid samples, if present, from the pipe surface, and conduct elemental analysis and microbial tests on these samples, as appropriate. Examples of samples that may be collected are, but not limited to, the following: • Liquid accumulated underneath the coating. • Corrosion products and/or deposits from the internal and external surfaces of pipe surface. • Soil adhering to the pipe. 4. If coating is to be removed, it should be removed in a manner that will not be injurious to the pipe. Photographically document and visually inspect the pipe again following coating removal (see 1. and 2. above for guidance). 5. It may be necessary to inspect the failed section of pipe for cracking, stress corrosion cracking, or any other condition that could affect the long term integrity of the pipeline using non-destructive testing techniques. The surfaces of the pipe surrounding the rupture should be cleaned with an appropriate non-abrasive cleaner and subsequently inspected using a wet fluorescent magnetic particle inspection (WFMT) method. The WFMT method is preferred because internal and external defects can be readily identified. Other non- destructive examination techniques such as Fluorescent Penetrant, Radiographic, Eddy- Current, Ultrasonic Inspection, and Alternating Current Potential Drop may also be used. 6. The physical location of all samples to be removed from the pipe for examination and metallurgical analysis should be documented such that all relevant features are visible (graphically and/or photographically). CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 7

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Physical Measurements 1. Measure the diameter and wall thickness on undisturbed areas of the pipe to confirm the information provided in the “Background Information Data Sheet”. 2. Measure the diameter and wall thickness at selected locations to determine actual values at these selected locations. Measure and record the diameter and wall thickness of the pipe at each end of each sample. (Wall thickness should be determined based upon four measurements taken 90 degrees apart.) 3. Verify roundness and geometry of pipe at the extremities and closer to the failed surface. 4. Measure the wall thickness around fracture surfaces and any damaged areas. If corrosion is identified near or around the fracture surfaces, a “corrosion map” should be produced detailing the extent of the corrosion on the pipe surfaces and the pipe wall thicknesses in those areas. This information may be needed to support remaining strength calculations, if required. 5. Align the pipe samples to conform to the pre-fracture bend geometry. 6. Determine and mark the location of the electric-resistance weld at each end of each sample. 7. Determine whether or not any part of each rupture falls within the electric-resistance weld zone. 8. Measure and record the length of each sample. 9. Record any markings detected on the inside or outside surfaces of the pipes. 10. Measure rupture lengths tip-to-tip. 11. Measure the shortest circumferential distance from each fracture origin to the nearest electric-resistance weld. 12. Measure the axial distance from each fracture origin to the nearest girth weld, if any. 13. Map wall thickness of each sample within 12 inches upstream and downstream of each rupture origin. Measurements will be taken on a 2-inch square grid pattern that is centered on the fracture origin and that encompasses 100 percent of the pipe circumference at each origin. 14. Determine depths of cracks using direct exploration (grinding), shear wave ultrasonic testing (UT), Alternating Current Potential Drop (ACPD) or other suitable methods. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 8

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Corrosion Examination Surface deposits and residues associated with the fracture area and adjacent areas should be collected and analyzed to characterize and determine the origin of the deposits. Based on the results of the visual, non-destructive, and metallographic examinations, the presence of corrosion should be documented, and the type and characteristics of any corrosion present should be evaluated. Remaining strength calculations (RSTRENG/ASME B31G) may be performed on corroded areas to support the failure investigation. Fractographic Examination 1. Visually examine the fracture surfaces in detail to identify the characteristics of the fracture, the nature of the original defect, and the failure initiation point(s). It may become necessary to open the fracture surface in order to conduct part of the examination, and a suitable technique that is dependent upon the particular circumstances of the failure should be used to open the fracture surface. 2. Clean samples in an Endox or Citronox solution to remove loose rust, scale, etc. as necessary. 3. Utilize a suitable method to thoroughly document the fracture surface including dimensional documentation. Suitable methods to document the fracture surface include, but are not limited to, the following: • Foil method. • Photographs of macroscopic examination. 4. Remove selected fractographic samples as necessary for detailed microscopic examination using optical or scanning electron microscope. Examine and document the fracture surface morphology. When chevron marks are present on the fracture surface, they typically point back towards the fracture origin in steels with an ultimate tensile strength of 60,000 psi and less. It is important to be able to characterize the fracture surface morphology, and fractures can be classified into four groups on a macroscopic scale, as follows: • Ductile fractures. • Brittle fractures. • Fatigue fractures. • Fractures resulting from combined effects of stress and environment. • Under low magnification under TLM, observe if there is evidence of fatigue, and ridges to indicate application of high pressure, such as due to hydrostatic testing. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 9

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Metallographic Examination 1. Identify metallographic sample origin (sample identification, location, orientation, etc.), perform metallographic evaluation, and take representative photomicrographs. Areas of particular concern are: • At or near the fracture origin. • Fracture surfaces. • Weld seams. • Anomalies. • Areas with indications of defects or cracks identified through visual and/or non- destructive testing. • Areas exhibiting “typical” microstructures of the base metal, weld metal, and heat- affected-zone. 2. Perform micro-hardness profiles at appropriate locations such as the following: • At or near the fracture origin. • Weld seams. 3. Metallographic samples should be examined to characterize and validate any appropriate issues specific to the failure such as: • Pipe specification, grade, and heat treatment. • Weld seam in area of fracture. • Weld seam in un-affected area. • Corrosion. • Indications of outside force damage. Mechanical Properties Testing should be performed to determine the mechanical properties of the pipe and any appurtenances. Mechanical properties of test specimens should not be taken from areas of the pipe that have been plastically deformed as a result of the failure. These mechanical tests should at least include the following: • Tensile testing. • Charpy V-notch testing. • Chemical analysis. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 10

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Tensile Testing Tensile test specimens should be prepared and tested in accordance with ASTM A370 (Mechanical Testing of Steel Products) for the pipe base metal and weld seams to measure yield strength, ultimate tensile strength, and elongation. The pipe base metal should, at a minimum be tested in the transverse direction, and weld seam specimens should be taken across the weld seam. Charpy V-notch Impact Testing Charpy V-notch (CVN) specimens should be prepared and tested in accordance with ASTM E23 (Notched Bar Impact Testing of Metallic Materials) to determine the toughness characteristics of the pipe in the L-T (transverse) direction. In some cases (depending on pipe size and wall thickness) it may be necessary to use sub-size specimens. Results from CVN testing may be reported in some or all of the following forms depending on the testing results: • Upper-Shelf Energy (in ft.-lbs.). • Lower-Shelf Energy (in ft.-lbs.). • Ductile-to-Brittle Transition Temperature (in °F) determined from graphical representation of testing results. • Test Temperature corresponding to 15 ft.-lbs. of absorbed impact energy. • Fracture Appearance Transition Temperature (in °F) corresponding to 50% shear. • Lateral expansion (to measure notch toughness). In some steels it may be difficult to measure percent shear because of “woody” fracture surfaces. In these cases, it would be more appropriate to use lateral expansion and absorbed energy measurements to obtain a more accurate transition temperature. A sample testing methodology for generating Charpy V-notch Curves for line pipe steels is provided in Table 2. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 11

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Charpy V-notch Impact Testing (Continued) Table 2 – A testing methodology for generating Charpy V-notch Curves for line pipe steels. Note: The following is an example test protocol to generate a Charpy V-notch (CVN) Curve and to determine the Ductile-to-Brittle Transition Temperature (DBTT) for API-X52 and lower grade line pipe. Prepare a minimum of 12 Charpy V-notch specimens (preferably 16 specimens) in the L-T (transverse) direction and perform CVN testing according to ASTM E23. Test 1 specimen at -20°F Test 1 specimen at 0°F If CVN values are less than 4 ft-lbs. (full scale), then consider this a part of the lower shelf temperatures. Test 1 specimen at 70°F Test 1 specimen at 100°F If CVN values are greater than 20 ft-lbs. and are close together, then consider this part of the upper shelf temperatures. If the difference in CVN values is more than 5 ft-lbs., then: Test 1 specimen at 70°F Test 1 specimen at 50°F If CVN values are close together, then the DBTT is likely to be around 50°F, then: Test 1 specimen at 50°F Test 1 specimen at 40°F Test 1 specimen at 20°F If the difference in CVN values at 50°F and 70°F is greater than 5ft-lbs., then Test 1 specimen at 50°F Test 1 specimen at 60°F Test the remaining specimens at other temperatures, as appropriate, to ensure that data has been collected at temperatures that the testing has shown to be of importance. Draw the CVN Curve to a best-fit curve plotting Impact Energy (ft-lbs.) versus Temperature (°F). Determine the DBTT from the CVN Curve (in °F). Determine the Temperature (in °F) corresponding to 15 ft-lbs. absorbed impact energy. Determine the Fracture Appearance Transition Temperature (in °F) corresponding to 50% and/or 80% shear. Determine the Upper-Shelf Energy (in ft-lbs.). Determine the Lower-Shelf Energy (in ft-lbs) CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 12

Emergency Management Original EMG-PRO-001A8 – Metallurgical Laboratory Failure Examination Protocol Issued: 18 Oct 21 3.0 Protocol (Continued) Chemical Analysis The chemical composition of the pipe material should be determined using an appropriate method to validate the pipe specification and grade, as well as, to determine its carbon equivalent (for weldability issues). Spectrochemical methods (i.e., optical emission) are usually employed to determine steel chemical compositions. Wet chemical methods may also be used. Energy dispersive spectroscopy (EDS) and either x-ray diffraction (XRD) or x-ray photoelectron spectroscopy (XPS) analyses may be used to determine elements and compounds present in surface deposits that were collected during the visual examination. 8.0 Revisions Revisions are documented and tracked as part of the Integrated Management System (IMS), Business Documents process. Approval of formal company documents are managed under the IMS, Change Management process. CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED. 13

Emergency Management  Original EMG‐PRO‐001A9, Plan Holder List  Issued: 15 Dec 21    Annex 9, Plan Holder List  1.0  Purpose  This annex is a part of EMG‐PRO‐001, Management of Gas Emergencies, and Identifies the  organizations, methods and timing with whom Centra Pipelines (Centra ‐ which includes Centra  Transmission Holdings, Inc., and Centra Pipelines Minnesota, Inc.) shares information regarding  its emergency management program information.  2.0  Scope  This annex is applicable to the formal sharing of Centra’s emergency management program  information, including EMG‐002, Non‐Gas Emergencies.  3.0  Process  Centra Employees & Enbridge Gas Control  The Emergency Management Program (EMP) is available to all Centra Pipelines (Centra ‐ which  includes Centra Transmission Holdings, Inc., and Centra Pipelines Minnesota, Inc.) employees and  Enbridge Gas Control through SharePoint.  Employees should ensure that the EMP is synchronized  to their computers so the most current revision of the EMP is available even if offline.  Regulatory Agencies  Revision Date  Distribution Date  Plan Location  29 March 2021  Next Inspection  Minnesota Office of Pipeline Safety (MNOPS)  N/A  N/A  St. Paul, MN  Electronic Copy  29 March 2021 31 March 2021 The Canada Energy Regulator (CER) – Calgary, AB  29 March 2021  N/A  Hard Copy Electronic Copy Centra Mobile Emergency Operations Centre (EOC)  Hard Copy Emergency Response & Public Officials  Emergency Response and Public Officials are provided Emergency Management Program  Summaries distributed through mailings and training sessions.  4.0  Revisions  Revisions are documented and tracked as part of the Integrated Management System (IMS),  Business Documents process.  Approval of formal company documents are managed under the  IMS, Change Management process.    CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    1

Emergency Management  Original EMG‐PRO‐001A10, Management of Gas Emergencies  Issued: 16 Dec 21    Annex 10, Contact References  1.0  Purpose  This annex is a part of Centra Pipelines (Centra ‐ which includes Centra Transmission Holdings,  Inc., and Centra Pipelines Minnesota, Inc.) EMG‐PRO‐001, Management of Gas Emergencies,  and details both internal and external contact references in the event of either a natural gas  emergency or a non‐gas emergency.  2.0  Scope  This annex is applicable and available to all Centra employees in the execution of their  responsibilities as the relate to emergency response.  As such, this annex also applies to EMG‐ 002, Non‐Gas Emergencies.      CENTRA’S ELECTRONIC DOCUMENT SYSTEM CONTAINS THE MOST CURRENT VERSION OF THIS DOCUMENT. UNCONTROLLED WHEN PRINTED.    1