Enterprise Products Operating, LLC-1/26/15

Page 1Official PDFDOT U.S. Department of Transportation PHMSA Pipeline and Hazardous Materials Safety Administration OPS Office of Pipeline Safety Eastern Region Principal Investigator Michael Yazemboski Senior Accident Investigator Michael Yazemboski Region Director Byron E. Coy Date of Report 2/24/2016 Subject Failure Investigation Report—Enterprise Products Operating, LLC: ATEX Ethane Pipeline Failure, Follansbee, West Virginia Operator, Location, & Consequences Date of Failure 1/26/2015 Commodity Released Ethane City/County & State Follansbee, Brook County, West Virginia OpID & Operator Name 31618 Enterprise Products Operating, LLC Unit # & Unit Name 3051 Greensburg SMART Activity # 149469 Milepost/Location Latitude: 40.366817, Longitude: -80.584594 Type of Failure Girth Weld Failure Caused by Ductile Tensile Overload Fatalities 0 Injuries 0 Description of area impacted Non-HCA Total Costs $6,910,591#

Page 2Failure Investigation Report—Enterprise Products Operating, LLC ATEX Ethane Pipeline Failure Follansbee, Brook County, West Virginia [Failure Date 1/26/2015] Executive Summary On January 26, 2015, an accident occurred on the Enterprise Products ATEX-1 20-inch nominal pipe size (NPS) pipeline resulting in the release of approximately 30,565 barrels of liquid ethane in a rural, wooded, non- high consequence area (HCA) area near Follansbee, West Virginia. The ATEX-1 pipeline is approximately 1,265 miles long and transports product from Washington County, Pennsylvania, to Mont Belvieu, Texas (ATEX-1). The accident occurred on a 255-mile section of ATEX-1 that runs from Washington County, Pennsylvania, to Seymour, Indiana. The Pipeline and Hazardous Materials Safety Administration’s (PHMSA) Office of Pipeline Safety (OPS) initiated an investigation on January 26, 2015, determining that the accident was caused by a girth weld failure due to a ductile tensile overload from stresses resulting from the weight of the surrounding soil. As a result, on January 29, 2015, OPS issued a Corrective Action Order (CAO) (CPF 1-2015-5002H) requiring Enterprise to take certain corrective actions pertaining to the safety and remediation of the ATEX-1 pipeline system. An Amended Corrective Action Order (ACAO) was issued on March 12, 2015. There were no injuries, deaths, or extensive property damage associated with this accident; however, fire from the rupture burned approximately 5 acres of woodlands and damaged the siding on one home located approximately 2,000 feet from the failure location. Enterprise reported the failure to the National Response Center on January 26, 2015, at 11:38 a.m. CST. System Details The ATEX-1 pipeline originates in Washington County, Pennsylvania, and is connected to four fractionators in the Marcellus/Utica shale plays: the MarkWest Houston plant in Pennsylvania, the Cadiz plant in Ohio, the Blue Racer Natrium plant in West Virginia, and the Utica East Ohio Scio plant in Ohio. The ATEX-1 pipeline has a capacity of 125,000 barrels per day (bpd), expandable to approximately 265,000 bpd. The ATEX-1 line terminates at Enterprise’s complex in Mont Belvieu, Texas, which includes over 100 million barrels of natural gas liquid (NGL) and petroleum liquid storage capacity, more than 750,000 bpd of fractionation capacity, and an extensive NGL distribution system. The failure occurred near milepost (MP) 23.1 on Enterprise’s ATEX-1 20-inch NPS pipeline segment in West Virginia. This section of the ATEX-1 pipeline is part of the Greensburg- PA/WV unit, originating at the MarkWest Processing facility in Houston, Pennsylvania, and running west through West Virginia. The total length of the ATEX-1 line in the Greensburg-PA/WV unit is approximately 26 miles. The ATEX-1 Greensburg Unit passes through Washington County (b) (7)(F) Page 2 of 6#

Page 3Failure Investigation Report—Enterprise Products Operating, LLC ATEX Ethane Pipeline Failure Follansbee, Brook County, West Virginia [Failure Date 1/26/2015] in Pennsylvania and Brooke and Hancock Counties in West Virginia, terminating at the Ohio/West Virginia state line (Appendix A, map 4). Events Leading up to the Failure The operating pressure at the time of failure was 1,183 psig, which was below the maximum operating pressure (MOP) of 1,440 psig for the affected segment. 1 On January 26, 2015, at approximately 9:38 a.m. CST, Enterprise’s control room observed a sudden pressure drop on its supervisory control and data acquisition (SCADA) screens, indicating a possible failure on the ATEX-1 pipeline near MP 23.1. Emergency Response Upon identifying a sudden pressure drop on the ATEX-1 Line, Enterprise’s control room began closing the automated block valves (Motor Operated Valve (MOV)- ) and (b) (7)(F) MOV- to isolate the segment. The control (b) (7)(F) room then notified Enterprise field personnel, who responded by manually closing mainline block valves (MLV)- (b) (7)(F) (b) (7)(F) ) and MLV- to further restrict product flow. A detailed map showing the ATEX-1 line and the location of valves can be found in Appendix A, map 4. Immediately after the accident, Line A-1, an 8-inch NPS propane line located in the vicinity of the rupture site, was also isolated as a precaution. It was later determined that Line A-1 was not impacted by the fire or explosion due to its location several hundred feet from the failure site (Appendix A, map 3). Line A-1 was later returned to normal service. The fire departments in Wellsburg, West Virginia, and Follansbee, West Virginia, responded to incident, evacuating a nearby residence approximately 2,000 feet from the site and closing Lee Road and Scott Hollow Road to vehicle traffic. The residence suffered external damage to its siding due to radiant heat caused by the fire (Appendix A). The resulting explosion and fire from the rupture burned approximately 5 acres of woodland and damaged overhead powerlines located in the vicinity of the rupture (Appendix A). There were no reported injuries, fatalities, or permanent evacuations. A detailed timeline of events can be found in Appendix E. Summary of Return-to-Service On January 29, 2015, PHMSA issued a CAO requiring Enterprise to take certain corrective actions to verify the safety and integrity of the ATEX-1 Pipeline. An ACAO was later issued on March 12, 2015. The requirements of the order included the following elements (details of which are outlined in the order): 1. Repair Plan 2. Restart Plan 3. Contingency Plan (Operating and Monitoring of the Pipeline During Startup) 4. Records Verification (Confirmation of Maximum Operating Pressure) 5. Review of Prior In-line inspection (ILI) Results 1 The term “Affected Segment” means the segment that runs from the MarkWest Processing Facility in Houston, Pennsylvania, to Seymour, Indiana. Page 3 of 6#

Page 4Failure Investigation Report—Enterprise Products Operating, LLC ATEX Ethane Pipeline Failure Follansbee, Brook County, West Virginia [Failure Date 1/26/2015] 6. Mechanical and Metallurgical Testing 7. Root Cause Failure Analysis 8. Emergency Response Plan and Training Review 9. Public Awareness Program Review 10. Remedial Work Plan (RWP) Repair and remediation work at the site was performed in accordance with Enterprise’s Repair Plan (Appendix I). Replacement pipe was installed and the damaged segments of pipe were removed and sent to Kiefner and Associates for metallurgical analysis (Appendix D). On February 14, 2015, the ATEX pipeline section stretching from Houston, Pennsylvania, to the Ohio River resumed operations at a reduced MOP of 947 psig (20% pressure reduction from 1,183 psig at the time of the incident) in accordance with the PHMSA-approved Restart Plan submitted by Enterprise (Appendix H). Following the restart of the line, a series of ILI tools were run in accordance with the PHSMA-approved RWP submitted by Enterprise (Appendix G). Enterprise completed analysis of the data, including bending strain across all segments, on August 14, 2015. All necessary excavations were completed on August 28, 2015. PHMSA conducted numerous on- site inspections throughout the course of the work to ensure that all requirements of the RWP were completed. On September 8, 2015, PHMSA approved removal of the ACAO-initiated pressure restriction, and the ATEX-1 pipeline was permitted to return to 100% MOP. Investigation Details 1. The ATEX-1 pipeline was placed into service on November 25, 2013. 2. The pipeline transports liquid ethane. 3. The line is 20-inch NPS, 0.312-inch wall thickness, API 5L X-70, high-frequency electric resistance welded pipe manufactured by American Pipe. 4. The pipe was externally coated with fusion bonded epoxy and protected since construction by an impressed current cathodic protection system. 5. Historical operation and maintenance records were reviewed during the investigation. There were no reported maintenance issues, incidents, or repairs made to the pipeline since it was placed in service. 6. Prior integrity assessments consisted of the original post-construction hydrostatic test and post- construction caliper ILI. 7. The MOP of the pipeline in the affected segment is 1,440 psig, as established by hydrostatic testing in 2013. 8. The explosion and fire that resulted from the pipeline rupture burned approximately 5 acres of woodlands. However, there was no impact to waterways due to the rapid vaporization of the liquid ethane, and the area is not considered an HCA. 9. Immediately after the accident, Line A-1, an 8-inch NPS propane line located in the vicinity of the rupture site, was also isolated as a precaution. It was later determined that Line A-1 was not impacted by the fire or explosion due to its location several hundred feet from the failure site (Appendix A, map 3). Line A-1 was later returned to normal service. 10. A nearby 6-inch NPS pipeline, Line A3, has been idle since 1972 and is not currently in operation. Page 4 of 6#

Page 5Failure Investigation Report—Enterprise Products Operating, LLC ATEX Ethane Pipeline Failure Follansbee, Brook County, West Virginia [Failure Date 1/26/2015] 11. Prior to the failure, SCADA pressure records showed the MOP of the line was not exceeded. Operating pressure at the time of failure was 1,183 psig, below the MOP of 1,440 psig. 12. PHMSA reviewed the adequacy of emergency response related to the release, as well as applicable procedures pertaining to construction, operations, and maintenance of the ATEX-1 pipeline. No issues were identified. 13. Samples of the affected pipe were removed and sent to Kiefner for metallurgical analysis and testing. These samples included the upstream and downstream girth welds, upstream and downstream pipe joints, and 2 feet of the pipe immediately upstream and downstream of the failure location. Results of the testing and examination are outlined in Appendix D of this report. 14. A survey of the failure site comparing the elevation of the pipeline at the failure location to the as-built map elevations was conducted during the excavation and remediation process. The survey indicated that the pipe had dropped more than 3 feet since the line was originally constructed. A geotechnical survey conducted by Pennsylvania Soil and Rock determined that the failed pipe was installed across a transition area or “head wall” of an old underground mine and surface strip mine. In addition, the soil on which the pipeline was laid had undergone little consolidation since the mining was completed. Details of the geotechnical survey analysis can be found in the Enterprise Remedial Work Plan (Appendix G). 15. Depth of cover at the failure site was approximately 12 feet. 16. There were multiple complex bends near the failure location. 17. Buoyancy control weights were installed in the vicinity of the failure site during the original construction of the pipeline (Appendix A, photo 7). 18. The explosion and fire that resulted from the pipeline rupture burned approximately 5 acres of woodlands and damaged high tension power lines near the failure site (Appendix A, photo 2). 19. Due to the rapid vaporization of the liquid ethane there was no impact to waterways. 20. Approximately 30,565 barrels of liquid ethane were released. Findings and Contributing Factors Findings: Metallurgical testing of the failed pipe section was conducted by Kiefner and Associates, and showed that the accident was caused by a girth weld failure due to a ductile tensile overload from stresses resulting from loads imposed by the surrounding soil. The data also indicated that the intact upstream and downstream girth welds met the quality requirements and mechanical properties of API 1104. The mechanical properties of the pipe joints immediately adjacent to the rupture location, as well as the next pipe joints upstream and downstream, also met the chemical and mechanical properties for Grade X70 pipe (Appendix D). Contributing Factors: Previous mining activities were a contributing factor to the failure. The pipeline settlement in the failure location was likely caused by the consolidation of existing surface mine spoils during construction, added cover, and the placement of buoyancy control measures on the pipe. Page 5 of 6#

Page 6Failure Investigation Report—Enterprise Products Operating, LLC ATEX Ethane Pipeline Failure Follansbee, Brook County, West Virginia [Failure Date 1/26/2015] Appendices A 149469 Appendix A—Maps and Photographs B 149469 Appendix B—NRC Report 1106602 C 149469 Appendix C—Incident Report Form 7000.1 D 149469 Appendix D—Metallurgical Analysis Report E 149469 Appendix E—Timeline of Events F 149469 Appendix F—Amended CAO—CPF120155002H G 149469 Appendix G—ATEX Remedial Work Plan H 149469 Appendix H—ATEX Restart Plan I 149469 Appendix I—ATEX Repair Plan Page 6 of 6#

Page 7149469 Appendix A_Maps and Photographs Map-1 Map-2 Page 1 of 14#

Page 8149469 Appendix A_Maps and Photographs Map-3 Page 2 of 14#

Page 9149469 Appendix A_Maps and Photographs (b) (7)(F) Map-4 : Atex-1 Pipeline Page 3 of 14#

Page 10149469 Appendix A_Maps and Photographs Page 4 of 14#

Page 11149469 Appendix A_Maps and Photographs Photo 1 : (Jan 26, 2015) The explosion and fire that resulted from the pipeline rupture burned approximately 5 acres of woodlands. There was no impact to waterways due to the rapid vaporization of the liquid ethane. Page 5 of 14#

Page 12149469 Appendix A_Maps and Photographs Photo 2 – (Jan 26, 2015) Power lines were damaged in the right-of-way that crosses the Atex-1 pipeline. Page 6 of 14#

Page 13149469 Appendix A_Maps and Photographs Photo 3 – (Jan 26, 2015) Siding damaged from residual heat. This home is located approximately 2000 feet from the ruputure site. Page 7 of 14#

Page 14149469 Appendix A_Maps and Photographs Photo 4 – (Jan 27, 2015) Rupture site. Page 8 of 14#

Page 15149469 Appendix A_Maps and Photographs Photo 5 – (Jan 27, 2015) Page 9 of 14#

Page 16149469 Appendix A_Maps and Photographs Photo 6 – (Feb 1, 2015) Excavating the pipe. Page 10 of 14#

Page 17149469 Appendix A_Maps and Photographs Photo 7 – (Feb 2, 2015) Photo shows failure location wrapped with rock shield to protect the pipe ends durng excavation. Weighted buoyancy control bags are shown on the pipe. Page 11 of 14#

Page 18149469 Appendix A_Maps and Photographs Photo 8 –(Feb 3, 2015) Removal of ruptured pipe. Page 12 of 14#

Page 19149469 Appendix A_Maps and Photographs Photo 9 – (Feb 3, 2015) Ruptured pipe section removed including upstream and downstream welds. Pipe and welds sent for metallurgical testing. Page 13 of 14#

Page 20149469 Appendix A_Maps and Photographs Photo 10 - (Feb 5, 2015) Installing replacement pipe section. Page 14 of 14#

Page 21149469 Appendix B_NRC Report 1106602 Page 1 of 4#

Page 22149469 Appendix B_NRC Report 1106602 Page 2 of 4#

Page 23149469 Appendix B_NRC Report 1106602 Page 3 of 4#

Page 24149469 Appendix B_NRC Report 1106602 Page 4 of 4#

Page 25149469 Appendix C_Incident Report Form 7000.1 NOTICE: This report is required by 49 CFR Part 195. Failure to report can result in a civil penalty not to exceed $100,000 for each violation for each day that such violation persists except that the maximum civil penalty shall not exceed $1,000,000 as provided in 49 USC 60122. OMB NO: 2137-0047 EXPIRATION DATE: 07/31/2015 Original Report Date: 02/24/2015 U.S Department of Transportation Pipeline and Hazardous Materials Safety Administration No. 20150071 - 20723 -------------------------- (DOT Use Only) ACCIDENT REPORT - HAZARDOUS LIQUID PIPELINE SYSTEMS A federal agency may not conduct or sponsor, and a person is not required to respond to, nor shall a person be subject to a penalty for failure to comply with a collection of information subject to the requirements of the Paperwork Reduction Act unless that collection of information displays a current valid OMB Control Number. The OMB Control Number for this information collection is 2137-0047. All responses to the collection of information are mandatory. Send comments regarding this burden or any other aspect of this collection of information, including suggestions for reducing the burden to: Information Collection Clearance Officer, PHMSA, Office of Pipeline Safety (PHP-30) 1200 New Jersey Avenue, SE, Washington, D.C. 20590. INSTRUCTIONS Important: Please read the separate instructions for completing this form before you begin. They clarify the information requested and provide specific examples. If you do not have a copy of the instructions, you can obtain one from the PHMSA Pipeline Safety Community Web Page at http://www.phmsa.dot.gov/pipeline/library/forms. PART A - KEY REPORT INFORMATION Report Type: (select all that apply) Original: Supplemental: Final: Yes Last Revision Date: 09/08/2015 1. Operator's OPS-issued Operator Identification Number (OPID): 31618 2. Name of Operator ENTERPRISE PRODUCTS OPERATING LLC 3. Address of Operator: 3a. Street Address 1100 Louisiana Street 3b. City HOUSTON 3c. State Texas 3d. Zip Code 77002 4. Local time (24-hr clock) and date of the Accident: 01/26/2015 09:38 5. Location of Accident: Latitude: 40.366817 Longitude: -80.584594 6. National Response Center Report Number (if applicable): 1106602 7. Local time (24-hr clock) and date of initial telephonic report to the National Response Center (if applicable): 01/26/2015 11:38 8. Commodity released: (select only one, based on predominant volume released) HVL or Other Flammable or Toxic Fluid which is a Gas at Ambient Conditions - Specify Commodity Subtype: Other HVL - If "Other" Subtype, Descr be: Ethane - If Biofuel/Alternative Fuel and Commodity Subtype is Ethanol Blend, then % Ethanol Blend: - If Biofuel/Alternative Fuel and Commodity Subtype is Biodiesel, then Biodiesel Blend e.g. B2, B20, B100 9. Estimated volume of commodity released unintentionally (Barrels): 30,565.00 10. Estimated volume of intentional and/or controlled release/blowdown (Barrels): 11. Estimated volume of commodity recovered (Barrels): 12. Were there fatalities? No - If Yes, specify the number in each category: 12a. Operator employees 12b. Contractor employees working for the Operator 12c. Non-Operator emergency responders 12d. Workers working on the right-of-way, but NOT associated with this Operator 12e. General public 12f. Total fatalities (sum of above) 13. Were there injuries requiring inpatient hospitalization? No - If Yes, specify the number in each category: 13a. Operator employees 13b. Contractor employees working for the Operator 13c. Non-Operator emergency responders 13d. Workers working on the right-of-way, but NOT associated with this Operator 13e. General public Form PHMSA F 7000.1 Page 1 of 13#

Page 26149469 Appendix C_Incident Report Form 7000.1 13f. Total injuries (sum of above) 14. Was the pipeline/facility shut down due to the Accident? Yes - If No, Explain: - If Yes, complete Questions 14a and 14b: (use local time, 24-hr clock) 14a. Local time and date of shutdown: 01/26/2015 09:39 14b. Local time pipeline/facility restarted: 02/14/2015 13:30 - Still shut down? (* Supplemental Report Required) 15. Did the commodity ignite? Yes 16. Did the commodity explode? Yes 17. Number of general public evacuated: 1 18. Time sequence (use local time, 24-hour clock): 18a. Local time Operator identified Accident - effective 7- 2014 changed to "Local time Operator identified failure": 01/26/2015 09:39 18b. Local time Operator resources arrived on site: 01/26/2015 11:00 PART B - ADDITIONAL LOCATION INFORMATION 1. Was the origin of the Accident onshore? Yes If Yes, Complete Questions (2-12) If No, Complete Questions (13-15) - If Onshore: 2. State: West Virginia 3. Zip Code: 26035 4. City Colliers 5. County or Parish Brooke 6. Operator-designated location: Milepost/Valve Station Specify: 23.1 7. Pipeline/Facility name: ATEX-1 8. Segment name/ID: Greensburg - Pennsylvania/West Virginia 9. Was Accident on Federal land, other than the Outer Continental Shelf (OCS)? No 10. Location of Accident: Pipeline Right-of-way 11. Area of Accident (as found): Underground Specify: Under soil - If Other, Descr be: Depth-of-Cover (in): 168 12. Did Accident occur in a crossing? No - If Yes, specify type below: - If Bridge crossing – Cased/ Uncased: - If Railroad crossing – Cased/ Uncased/ Bored/drilled - If Road crossing – Cased/ Uncased/ Bored/drilled - If Water crossing – Cased/ Uncased - Name of body of water, if commonly known: - Approx. water depth (ft) at the point of the Accident: - Select: - If Offshore: 13. Approximate water depth (ft) at the point of the Accident: 14. Origin of Accident: - In State waters - Specify: - State: - Area: - Block/Tract #: - Nearest County/Parish: - On the Outer Continental Shelf (OCS) - Specify: - Area: - Block #: 15. Area of Accident: PART C - ADDITIONAL FACILITY INFORMATION 1. Is the pipeline or facility: Interstate 2. Part of system involved in Accident: Onshore Pipeline, Including Valve Sites - If Onshore Breakout Tank or Storage Vessel, Including Attached Appurtenances, specify: 3. Item involved in Accident: Pipe - If Pipe, specify: Pipe Body 3a. Nominal diameter of pipe (in): 20 Form PHMSA F 7000.1 Page 2 of 13#

Page 27149469 Appendix C_Incident Report Form 7000.1 3b. Wall thickness (in): .312 3c. SMYS (Specified Minimum Yield Strength) of pipe (psi): 70,000 3d. Pipe specification: API-5L X70 3e. Pipe Seam , specify: Longitudinal ERW - High Frequency - If Other, Descr be: 3f. Pipe manufacturer: American Pipe 3g. Year of manufacture: 2013 3h. Pipeline coating type at point of Accident, specify: Fusion Bonded Epoxy - If Other, Descr be: - If Weld, including heat-affected zone, specify. If Pipe Girth Weld, 3a through 3h above are required: - If Other, Descr be: - If Valve, specify: - If Mainline, specify: - If Other, Descr be: 3i. Manufactured by: 3j. Year of manufacture: - If Tank/Vessel, specify: - If Other - Descr be: - If Other, descr be: 4. Year item involved in Accident was installed: 2013 5. Material involved in Accident: Carbon Steel - If Material other than Carbon Steel, specify: 6. Type of Accident Involved: Rupture - If Mechanical Puncture – Specify Approx. size: in. (axial) by in. (circumferential) - If Leak - Select Type: - If Other, Descr be: - If Rupture - Select Orientation: Circumferential - If Other, Describe: Approx. size: in. (widest opening) by 1 in. (length circumferentially or axially) 20 - If Other – Describe: PART D - ADDITIONAL CONSEQUENCE INFORMATION 1. Wildlife impact: No 1a. If Yes, specify all that apply: - Fish/aquatic - Birds - Terrestrial 2. Soil contamination: No 3. Long term impact assessment performed or planned: No 4. Anticipated remediation: Yes 4a. If Yes, specify all that apply: - Surface water - Groundwater - Soil - Vegetation Yes - Wildlife 5. Water contamination: No 5a. If Yes, specify all that apply: - Ocean/Seawater - Surface - Groundwater - Drinking water: (Select one or both) - Private Well - Public Water Intake 5b. Estimated amount released in or reaching water (Barrels): 5c. Name of body of water, if commonly known: 6. At the location of this Accident, had the pipeline segment or facility been identified as one that "could affect" a High Consequence Area (HCA) as determined in the Operator's Integrity Management Program? No 7. Did the released commodity reach or occur in one or more High Consequence Area (HCA)? No 7a. If Yes, specify HCA type(s): (Select all that apply) - Commercially Navigable Waterway: Was this HCA identified in the "could affect" determination for this Accident site in the Operator's Form PHMSA F 7000.1 Page 3 of 13#

Page 28149469 Appendix C_Incident Report Form 7000.1 Integrity Management Program? - High Population Area: Was this HCA identified in the "could affect" determination for this Accident site in the Operator's Integrity Management Program? - Other Populated Area Was this HCA identified in the "could affect" determination for this Accident site in the Operator's Integrity Management Program? - Unusually Sensitive Area (USA) - Drinking Water Was this HCA identified in the "could affect" determination for this Accident site in the Operator's Integrity Management Program? - Unusually Sensitive Area (USA) - Ecological Was this HCA identified in the "could affect" determination for this Accident site in the Operator's Integrity Management Program? 8. Estimated cost to Operator – effective 12-2012, changed to "Estimated Property Damage": 8a. Estimated cost of public and non-Operator private property damage paid/reimbursed by the Operator – effective 12-2012, "paid/reimbursed by the Operator" removed $ 95,000 8b. Estimated cost of commodity lost $ 194,000 8c. Estimated cost of Operator's property damage & repairs $ 1,821,591 8d. Estimated cost of Operator's emergency response $ 0 8e. Estimated cost of Operator's environmental remediation $ 0 8f. Estimated other costs $ 4,800,000 Descr be: Costs to implement Remedial Work Plan 8g. Estimated total costs (sum of above) – effective 12-2012, changed to "Total estimated property damage (sum of above)" $ 6,910,591 PART E - ADDITIONAL OPERATING INFORMATION 1. Estimated pressure at the point and time of the Accident (psig): 1,183.00 2. Maximum Operating Pressure (MOP) at the point and time of the Accident (psig): 1,440.00 3. Describe the pressure on the system or facility relating to the Accident (psig): Pressure did not exceed MOP 4. Not including pressure reductions required by PHMSA regulations (such as for repairs and pipe movement), was the system or facility relating to the Accident operating under an established pressure restriction with pressure limits below those normally allowed by the MOP? No - If Yes, Complete 4.a and 4.b below: 4a. Did the pressure exceed this established pressure restriction? 4b. Was this pressure restriction mandated by PHMSA or the State? 5. Was "Onshore Pipeline, Including Valve Sites" OR "Offshore Pipeline, Including Riser and Riser Bend" selected in PART C, Question 2? Yes - If Yes - (Complete 5a. – 5f below) effective 12-2012, changed to "(Complete 5.a – 5.e below)" 5a. Type of upstream valve used to initially isolate release source: Remotely Controlled 5b. Type of downstream valve used to initially isolate release source: Remotely Controlled 5c. Length of segment isolated between valves (ft): 112,094 5d. Is the pipeline configured to accommodate internal inspection tools? Yes - If No, Which physical features limit tool accommodation? (select all that apply) - Changes in line pipe diameter - Presence of unsuitable mainline valves - Tight or mitered pipe bends - Other passage restrictions (i.e. unbarred tee's, projecting instrumentation, etc.) - Extra thick pipe wall (applicable only for magnetic flux leakage internal inspection tools) - Other - - If Other, Descr be: 5e. For this pipeline, are there operational factors which significantly complicate the execution of an internal inspection tool run? No - If Yes, Which operational factors complicate execution? (select all that apply) Form PHMSA F 7000.1 Page 4 of 13#

Page 29149469 Appendix C_Incident Report Form 7000.1 - Excessive debris or scale, wax, or other wall buildup - Low operating pressure(s) - Low flow or absence of flow - Incompatible commodity - Other - - If Other, Descr be: 5f. Function of pipeline system: > 20% SMYS Regulated Trunkline/Transmission 6. Was a Supervisory Control and Data Acquisition (SCADA)-based system in place on the pipeline or facility involved in the Accident? Yes If Yes - 6a. Was it operating at the time of the Accident? Yes 6b. Was it fully functional at the time of the Accident? Yes 6c. Did SCADA-based information (such as alarm(s), alert(s), event(s), and/or volume calculations) assist with the detection of the Accident? Yes 6d. Did SCADA-based information (such as alarm(s), alert(s), event(s), and/or volume calculations) assist with the confirmation of the Accident? Yes 7. Was a CPM leak detection system in place on the pipeline or facility involved in the Accident? Yes - If Yes: 7a. Was it operating at the time of the Accident? Yes 7b. Was it fully functional at the time of the Accident? Yes 7c. Did CPM leak detection system information (such as alarm(s), alert(s), event(s), and/or volume calculations) assist with the detection of the Accident? Yes 7d. Did CPM leak detection system information (such as alarm(s), alert(s), event(s), and/or volume calculations) assist with the confirmation of the Accident? Yes 8. How was the Accident initially identified for the Operator? CPM leak detection system or SCADA-based information (such as alarm(s), alert(s), event(s), and/or volume calculations) - If Other, Specify: 8a. If "Controller", "Local Operating Personnel", including contractors", "Air Patrol", or "Ground Patrol by Operator or its contractor" is selected in Question 8, specify: 9. Was an investigation initiated into whether or not the controller(s) or control room issues were the cause of or a contributing factor to the Accident? - If No, the Operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate) No, the Operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the Operator did not investigate) Line ruptured while in steady-state operation below MOP. No investigation into controller actions necessary. - If Yes, specify investigation result(s): (select all that apply) - Investigation reviewed work schedule rotations, continuous hours of service (while working for the Operator), and other factors associated with fatigue - Investigation did NOT review work schedule rotations, continuous hours of service (while working for the Operator), and other factors associated with fatigue Provide an explanation for why not: - Investigation identified no control room issues - Investigation identified no controller issues - Investigation identified incorrect controller action or controller error - Investigation identified that fatigue may have affected the controller(s) involved or impacted the involved controller(s) response - Investigation identified incorrect procedures - Investigation identified incorrect control room equipment operation - Investigation identified maintenance activities that affected control room operations, procedures, and/or controller response - Investigation identified areas other than those above: Descr be: PART F - DRUG & ALCOHOL TESTING INFORMATION Form PHMSA F 7000.1 Page 5 of 13#

Page 30149469 Appendix C_Incident Report Form 7000.1 1. As a result of this Accident, were any Operator employees tested under the post-accident drug and alcohol testing requirements of DOT's Drug & Alcohol Testing regulations? No - If Yes: 1a. Specify how many were tested: 1b. Specify how many failed: 2. As a result of this Accident, were any Operator contractor employees tested under the post-accident drug and alcohol testing requirements of DOT's Drug & Alcohol Testing regulations? No - If Yes: 2a. Specify how many were tested: 2b. Specify how many failed: PART G – APPARENT CAUSE Select only one box from PART G in shaded column on left representing the APPARENT Cause of the Accident, and answer the questions on the right. Describe secondary, contributing or root causes of the Accident in the narrative (PART H). Apparent Cause: G5 - Material Failure of Pipe or Weld G1 - Corrosion Failure - only one sub-cause can be picked from shaded left-hand column Corrosion Failure – Sub-Cause: - If External Corrosion: 1. Results of visual examination: - If Other, Descr be: 2. Type of corrosion: (select all that apply) - Galvanic - Atmospheric - Stray Current - Microbiological - Selective Seam - Other: - If Other, Descr be: 3. The type(s) of corrosion selected in Question 2 is based on the following: (select all that apply) - Field examination - Determined by metallurgical analysis - Other: - If Other, Descr be: 4. Was the failed item buried under the ground? - If Yes : 4a. Was failed item considered to be under cathodic protection at the time of the Accident? If Yes - Year protection started: 4b. Was shielding, tenting, or disbonding of coating evident at the point of the Accident? 4c. Has one or more Cathodic Protection Survey been conducted at the point of the Accident? If "Yes, CP Annual Survey" – Most recent year conducted: If "Yes, Close Interval Survey" – Most recent year conducted: If "Yes, Other CP Survey" – Most recent year conducted: - If No: 4d. Was the failed item externally coated or painted? 5. Was there observable damage to the coating or paint in the vicinity of the corrosion? - If Internal Corrosion: 6. Results of visual examination: - Other: 7. Type of corrosion (select all that apply): - - Corrosive Commodity - Water drop-out/Acid - Microbiological - Erosion - Other: - If Other, Descr be: 8. The cause(s) of corrosion selected in Question 7 is based on the following (select all that apply): - - Field examination - Determined by metallurgical analysis - Other: Form PHMSA F 7000.1 Page 6 of 13#

Page 31149469 Appendix C_Incident Report Form 7000.1 - If Other, Descr be: 9. Location of corrosion (select all that apply): - - Low point in pipe - Elbow - Other: - If Other, Descr be: 10. Was the commodity treated with corrosion inhibitors or biocides? 11. Was the interior coated or lined with protective coating? 12. Were cleaning/dewatering pigs (or other operations) routinely utilized? 13. Were corrosion coupons routinely utilized? Complete the following if any Corrosion Failure sub-cause is selected AND the "Item Involved in Accident" (from PART C, Question 3) is Tank/Vessel. 14. List the year of the most recent inspections: 14a. API Std 653 Out-of-Service Inspection - No Out-of-Service Inspection completed 14b. API Std 653 In-Service Inspection - No In-Service Inspection completed Complete the following if any Corrosion Failure sub-cause is selected AND the "Item Involved in Accident" (from PART C, Question 3) is Pipe or Weld. 15. Has one or more internal inspection tool collected data at the point of the Accident? 15a. If Yes, for each tool used, select type of internal inspection tool and indicate most recent year run: - - Magnetic Flux Leakage Tool Most recent year: - Ultrasonic Most recent year: - Geometry Most recent year: - Caliper Most recent year: - Crack Most recent year: - Hard Spot Most recent year: - Combination Tool Most recent year: - Transverse Field/Triaxial Most recent year: - Other Most recent year: Descr be: 16. Has one or more hydrotest or other pressure test been conducted since original construction at the point of the Accident? If Yes - Most recent year tested: Test pressure: 17. Has one or more Direct Assessment been conducted on this segment? - If Yes, and an investigative dig was conducted at the point of the Accident:: Most recent year conducted: - If Yes, but the point of the Accident was not identified as a dig site: Most recent year conducted: 18. Has one or more non-destructive examination been conducted at the point of the Accident since January 1, 2002? 18a. If Yes, for each examination conducted since January 1, 2002, select type of non-destructive examination and indicate most recent year the examination was conducted: - Radiography Most recent year conducted: - Guided Wave Ultrasonic Most recent year conducted: - Handheld Ultrasonic Tool Most recent year conducted: - Wet Magnetic Particle Test Most recent year conducted: - Dry Magnetic Particle Test Most recent year conducted: - Other Most recent year conducted: Descr be: Form PHMSA F 7000.1 Page 7 of 13#

Page 32149469 Appendix C_Incident Report Form 7000.1 G2 - Natural Force Damage - only one sub-cause can be picked from shaded left-handed column Natural Force Damage – Sub-Cause: - If Earth Movement, NOT due to Heavy Rains/Floods: 1. Specify: - If Other, Descr be: - If Heavy Rains/Floods: 2. Specify: - If Other, Descr be: - If Lightning: 3. Specify: - If Temperature: 4. Specify: - If Other, Descr be: - If Other Natural Force Damage: 5. Describe: Complete the following if any Natural Force Damage sub-cause is selected. 6. Were the natural forces causing the Accident generated in conjunction with an extreme weather event? 6a. If Yes, specify: (select all that apply) - Hurricane - Tropical Storm - Tornado - Other - If Other, Descr be: G3 - Excavation Damage - only one sub-cause can be picked from shaded left-hand column Excavation Damage – Sub-Cause: - If Previous Damage due to Excavation Activity: Complete Questions 1-5 ONLY IF the "Item Involved in Accident" (from PART C, Question 3) is Pipe or Weld. 1. Has one or more internal inspection tool collected data at the point of the Accident? 1a. If Yes, for each tool used, select type of internal inspection tool and indicate most recent year run: - - Magnetic Flux Leakage Most recent year conducted: - Ultrasonic Most recent year conducted: - Geometry Most recent year conducted: - Caliper Most recent year conducted: - Crack Most recent year conducted: - Hard Spot Most recent year conducted: - Combination Tool Most recent year conducted: - Transverse Field/Triaxial Most recent year conducted: - Other Most recent year conducted: Descr be: 2. Do you have reason to believe that the internal inspection was completed BEFORE the damage was sustained? 3. Has one or more hydrotest or other pressure test been conducted since original construction at the point of the Accident? - If Yes: Most recent year tested: Test pressure (psig): 4. Has one or more Direct Assessment been conducted on the pipeline segment? - If Yes, and an investigative dig was conducted at the point of the Accident: Most recent year conducted: - If Yes, but the point of the Accident was not identified as a dig site: Most recent year conducted: 5. Has one or more non-destructive examination been conducted at the point of the Accident since January 1, 2002? Form PHMSA F 7000.1 Page 8 of 13#

Page 33149469 Appendix C_Incident Report Form 7000.1 5a. If Yes, for each examination, conducted since January 1, 2002, select type of non-destructive examination and indicate most recent year the examination was conducted: - Radiography Most recent year conducted: - Guided Wave Ultrasonic Most recent year conducted: - Handheld Ultrasonic Tool Most recent year conducted: - Wet Magnetic Particle Test Most recent year conducted: - Dry Magnetic Particle Test Most recent year conducted: - Other Most recent year conducted: Descr be: Complete the following if Excavation Damage by Third Party is selected as the sub-cause. 6. Did the operator get prior notification of the excavation activity? 6a. If Yes, Notification received from: (select all that apply) - - One-Call System - Excavator - Contractor - Landowner Complete the following mandatory CGA-DIRT Program questions if any Excavation Damage sub-cause is selected. 7. Do you want PHMSA to upload the following information to CGA- DIRT (www.cga-dirt.com)? 8. Right-of-Way where event occurred: (select all that apply) - - Public - If "Public", Specify: - Private - If "Private", Specify: - Pipeline Property/Easement - Power/Transmission Line - Railroad - Dedicated Public Utility Easement - Federal Land - Data not collected - Unknown/Other 9. Type of excavator: 10. Type of excavation equipment: 11. Type of work performed: 12. Was the One-Call Center notified? 12a. If Yes, specify ticket number: 12b. If this is a State where more than a single One-Call Center exists, list the name of the One-Call Center notified: 13. Type of Locator: 14. Were facility locate marks vis ble in the area of excavation? 15. Were facilities marked correctly? 16. Did the damage cause an interruption in service? 16a. If Yes, specify duration of the interruption (hours) 17. Description of the CGA-DIRT Root Cause (select only the one predominant first level CGA-DIRT Root Cause and then, where available as a choice, the one predominant second level CGA-DIRT Root Cause as well): Root Cause: - If One-Call Notification Practices Not Sufficient, specify: - If Locating Practices Not Sufficient, specify: - If Excavation Practices Not Sufficient, specify: - If Other/None of the Above, explain: G4 - Other Outside Force Damage - only one sub-cause can be selected from the shaded left-hand column Other Outside Force Damage – Sub-Cause: - If Damage by Car, Truck, or Other Motorized Vehicle/Equipment NOT Engaged in Excavation: 1. Vehicle/Equipment operated by: - If Damage by Boats, Barges, Drilling Rigs, or Other Maritime Equipment or Vessels Set Adrift or Which Have Otherwise Lost Their Mooring: 2. Select one or more of the following IF an extreme weather event was a factor: - Hurricane - Tropical Storm - Tornado Form PHMSA F 7000.1 Page 9 of 13#

Page 34149469 Appendix C_Incident Report Form 7000.1 - Heavy Rains/Flood - Other - If Other, Descr be: - If Previous Mechanical Damage NOT Related to Excavation: Complete Questions 3-7 ONLY IF the "Item Involved in Accident" (from PART C, Question 3) is Pipe or Weld. 3. Has one or more internal inspection tool collected data at the point of the Accident? 3a. If Yes, for each tool used, select type of internal inspection tool and indicate most recent year run: - Magnetic Flux Leakage Most recent year conducted: - Ultrasonic Most recent year conducted: - Geometry Most recent year conducted: - Caliper Most recent year conducted: - Crack Most recent year conducted: - Hard Spot Most recent year conducted: - Combination Tool Most recent year conducted: - Transverse Field/Triaxial Most recent year conducted: - Other Most recent year conducted: Descr be: 4. Do you have reason to believe that the internal inspection was completed BEFORE the damage was sustained? 5. Has one or more hydrotest or other pressure test been conducted since original construction at the point of the Accident? - If Yes: Most recent year tested: Test pressure (psig): 6. Has one or more Direct Assessment been conducted on the pipeline segment? - If Yes, and an investigative dig was conducted at the point of the Accident: Most recent year conducted: - If Yes, but the point of the Accident was not identified as a dig site: Most recent year conducted: 7. Has one or more non-destructive examination been conducted at the point of the Accident since January 1, 2002? 7a. If Yes, for each examination conducted since January 1, 2002, select type of non-destructive examination and indicate most recent year the examination was conducted: - Radiography Most recent year conducted: - Guided Wave Ultrasonic Most recent year conducted: - Handheld Ultrasonic Tool Most recent year conducted: - Wet Magnetic Particle Test Most recent year conducted: - Dry Magnetic Particle Test Most recent year conducted: - Other Most recent year conducted: Descr be: - If Intentional Damage: 8. Specify: - If Other, Descr be: - If Other Outside Force Damage: 9. Describe: G5 - Material Failure of Pipe or Weld - only one sub-cause can be selected from the shaded left-hand column Use this section to report material failures ONLY IF the "Item Involved in Accident" (from PART C, Question 3) is "Pipe" or "Weld." Material Failure of Pipe or Weld – Sub-Cause: Construction-, Installation-, or Fabrication-related 1. The sub-cause shown above is based on the following: (select all that apply) Form PHMSA F 7000.1 Page 10 of 13#

Page 35149469 Appendix C_Incident Report Form 7000.1 - Field Examination - Determined by Metallurgical Analysis - Other Analysis - If "Other Analysis", Descr be: - Sub-cause is Tentative or Suspected; Still Under Investigation (Supplemental Report required) Yes - If Construction, Installation, or Fabrication-related: 2. List contr buting factors: (select all that apply) - Fatigue or Vibration-related Specify: - If Other, Descr be: - Mechanical Stress: - Other Yes - If Other, Descr be: Under investigation - If Environmental Cracking-related: 3. Specify: - If Other - Describe: Complete the following if any Material Failure of Pipe or Weld sub-cause is selected. 4. Additional factors: (select all that apply): - Dent - Gouge - Pipe Bend - Arc Burn - Crack - Lack of Fusion - Lamination - Buckle - Wrinkle - Misalignment - Burnt Steel - Other: Yes - If Other, Descr be: Under investigation 5. Has one or more internal inspection tool collected data at the point of the Accident? No 5a. If Yes, for each tool used, select type of internal inspection tool and indicate most recent year run: - Magnetic Flux Leakage Most recent year run: - Ultrasonic Most recent year run: - Geometry Most recent year run: - Caliper Most recent year run: - Crack Most recent year run: - Hard Spot Most recent year run: - Combination Tool Most recent year run: - Transverse Field/Triaxial Most recent year run: - Other Most recent year run: Descr be: 6. Has one or more hydrotest or other pressure test been conducted since original construction at the point of the Accident? No - If Yes: Most recent year tested: Test pressure (psig): 7. Has one or more Direct Assessment been conducted on the pipeline segment? No - If Yes, and an investigative dig was conducted at the point of the Accident - Most recent year conducted: - If Yes, but the point of the Accident was not identified as a dig site - Most recent year conducted: 8. Has one or more non-destructive examination(s) been conducted at the point of the Accident since January 1, 2002? No 8a. If Yes, for each examination conducted since January 1, 2002, select type of non-destructive examination and indicate most recent year the examination was conducted: - Form PHMSA F 7000.1 Page 11 of 13#

Page 36149469 Appendix C_Incident Report Form 7000.1 - Radiography Most recent year conducted: - Guided Wave Ultrasonic Most recent year conducted: - Handheld Ultrasonic Tool Most recent year conducted: - Wet Magnetic Particle Test Most recent year conducted: - Dry Magnetic Particle Test Most recent year conducted: - Other Most recent year conducted: Descr be: G6 – Equipment Failure - only one sub-cause can be selected from the shaded left-hand column Equipment Failure – Sub-Cause: - If Malfunction of Control/Relief Equipment: 1. Specify: (select all that apply) - - Control Valve - Instrumentation - SCADA - Communications - Block Valve - Check Valve - Relief Valve - Power Failure - Stopple/Control Fitting - ESD System Failure - Other - If Other – Descr be: - If Pump or Pump-related Equipment: 2. Specify: - If Other – Descr be: - If Threaded Connection/Coupling Failure: 3. Specify: - If Other – Descr be: - If Non-threaded Connection Failure: 4. Specify: - If Other – Descr be: - If Other Equipment Failure: 5. Describe: Complete the following if any Equipment Failure sub-cause is selected. 6. Additional factors that contributed to the equipment failure: (select all that apply) - Excessive vibration - Overpressurization - No support or loss of support - Manufacturing defect - Loss of electricity - Improper installation - Mismatched items (different manufacturer for tubing and tubing fittings) - Dissimilar metals - Breakdown of soft goods due to compatibility issues with transported commodity - Valve vault or valve can contributed to the release - Alarm/status failure - Misalignment - Thermal stress - Other - If Other, Descr be: G7 - Incorrect Operation - only one sub-cause can be selected from the shaded left-hand column Incorrect Operation – Sub-Cause: Form PHMSA F 7000.1 Page 12 of 13#

Page 37149469 Appendix C_Incident Report Form 7000.1 - If Tank, Vessel, or Sump/Separator Allowed or Caused to Overfill or Overflow 1. Specify: - If Other, Descr be: - If Other Incorrect Operation 2. Describe: Complete the following if any Incorrect Operation sub-cause is selected. 3. Was this Accident related to (select all that apply): - - Inadequate procedure - No procedure established - Failure to follow procedure - Other: - If Other, Descr be: 4. What category type was the activity that caused the Accident? 5. Was the task(s) that led to the Accident identified as a covered task in your Operator Qualification Program? 5a. If Yes, were the individuals performing the task(s) qualified for the task(s)? G8 - Other Accident Cause - only one sub-cause can be selected from the shaded left-hand column Other Accident Cause – Sub-Cause: - If Miscellaneous: 1. Describe: - If Unknown: 2. Specify: PART H - NARRATIVE DESCRIPTION OF THE ACCIDENT At approximately 9:40 a m. C.S.T. on January 26, 2015, the ATEX pipeline failed near Follansbee, West Virginia, resulting in the release of approximately 30,565 barrels of liquid ethane into a wooded area. There were no injuries or impacted waterways, though he explosion and resul ing fire burned approximately five acres of woodlands. The fire in the surrounding area was extinguished at 7:10 p.m. E.S.T. in the evening of January 27, 2015. The failure was reported to the National Response Center (#1106602) on January 26, 2015, at 11:38 a.m. Metallurgical analysis indicates that the pipe failed from ductile tensile overload. The two primary sources for this strain are bending stress and sag-tension from pipe settlement. The pipeline was repaired and returned to service at a reduced maximum operating pressure on February 14, 2015. A Remedial Work Plan was developed and is being implemented per Amended Corrective Action Order (ACAO) CPF 1-2015-5002H. Additionally, periodic updates are being provided to PHMSA as prescribed by the ACAO. PART I - PREPARER AND AUTHORIZED SIGNATURE Preparer's Name Michael Pavlak Preparer's Title Sr. Compliance Specialist Preparer's Telephone Number 713-381-5897 Preparer's E-mail Address mjpavlak@eprod.com Preparer's Facsimile Number Authorized Signer Name Michael Pavlak Authorized Signer Title Sr. Compliance Specialist Authorized Signer Telephone Number 713-381-5897 Authorized Signer Email mjpavlak@eprod.com Date 09/08/2015 Form PHMSA F 7000.1 Page 13 of 13#

Page 38Appendix D Metallurgical Analysis Report This document is on file at PHMSA#

Page 39Appendix E Timeline of Events This document is on file at PHMSA#

Page 40149469 Appendix F_Amended CAO_CPF120155002H Page 1 of 13#

Page 41149469 Appendix F_Amended CAO_CPF120155002H Page 2 of 13#

Page 42149469 Appendix F_Amended CAO_CPF120155002H Page 3 of 13#

Page 43149469 Appendix F_Amended CAO_CPF120155002H Page 4 of 13#

Page 44149469 Appendix F_Amended CAO_CPF120155002H Page 5 of 13#

Page 45149469 Appendix F_Amended CAO_CPF120155002H Page 6 of 13#

Page 46149469 Appendix F_Amended CAO_CPF120155002H Page 7 of 13#

Page 47149469 Appendix F_Amended CAO_CPF120155002H Page 8 of 13#

Page 48149469 Appendix F_Amended CAO_CPF120155002H Page 9 of 13#

Page 49149469 Appendix F_Amended CAO_CPF120155002H Page 10 of 13#

Page 50149469 Appendix F_Amended CAO_CPF120155002H Page 11 of 13#

Page 51149469 Appendix F_Amended CAO_CPF120155002H Page 12 of 13#

Page 52149469 Appendix F_Amended CAO_CPF120155002H Page 13 of 13#

Page 53Appendix G ATEX Remedial Work Plan This document is on file at PHMSA#

Page 54Appendix H ATEX Restart Plan This document is on file at PHMSA#

Page 55Appendix I ATEX Repair Plan This document is on file at PHMSA#