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Near Miss / Good Catch	Service	Operations & Maintenance	2	2 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Construction	4	4 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Instrumentation and Electrical	Operations & Maintenance	7	7 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Customer Meter Regulator Relief Vent Cap	Operations & Maintenance	9	9 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Construction	10	10 - Overpressure and/or Unintended Loss of Pressure
Internal QA Finding	Service	Construction	14	14 - Overpressure and/or Unintended Loss of Pressure
Near Miss / Good Catch	Valve (excluding regulator/control valves)	Construction	19	19 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Operations & Maintenance	21	21 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	22	22 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	24	24 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Service	Construction	27	27 - Overpressure and/or Unintended Loss of Pressure
Near Miss / Good Catch	Main	Construction	28	28 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Construction	30	30 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Construction	42	42 - Overpressure and/or Unintended Loss of Pressure
Near Miss / Good Catch	Valve (excluding regulator/control valves)	Construction	50	50 - Overpressure and/or Unintended Loss of Pressure
Near Miss / Good Catch	Valve (excluding regulator/control valves)	Operations & Maintenance	52	52 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Inside Meter	Operations & Maintenance	54	54 - Overpressure and/or Unintended Loss of Pressure
Near Miss / Good Catch	Meter	Operations & Maintenance	55	55 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Operations & Maintenance	58	58 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Service	Construction	62	62 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Outside Meter	Operations & Maintenance	70	70 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	75	75 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Construction	82	82 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Operations & Maintenance	83	83 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Operations & Maintenance	84	84 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	88	88 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Operations & Maintenance	93	93 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	94	94 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Service	Operations & Maintenance	96	96 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	100	100 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Service	Construction	101	101 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	104	104 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Service	Operations & Maintenance	112	112 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Service	Operations & Maintenance	114	114 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Operations & Maintenance	126	126 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Operations & Maintenance	129	129 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Construction	130	130 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Wall Pipe	Operations & Maintenance	131	131 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Operations & Maintenance	133	133 - Overpressure and/or Unintended Loss of Pressure
Near Miss / Good Catch	Main	Construction	134	134 - Overpressure and/or Unintended Loss of Pressure
Near Miss / Good Catch	Main	Construction	136	136 - Overpressure and/or Unintended Loss of Pressure
Pipeline Safety Incidents	Main	Construction	143	143 - Overpressure and/or Unintended Loss of Pressure

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Near Miss / Good Catch	Regulator Station	Operations & Maintenance	3	3 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Operations & Maintenance	11	11 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Construction	12	12 - Damage Prevention (Excavation, Weather and Outside Force)
Regulatory Audit	Main	Construction	16	16 - Damage Prevention (Excavation, Weather and Outside Force)
Near Miss / Good Catch	Main	Operations & Maintenance	37	37 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Construction	41	41 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Construction	43	43 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Operations & Maintenance	46	46 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	48	48 - Damage Prevention (Excavation, Weather and Outside Force)
Near Miss / Good Catch	Service	Construction	49	49 - Damage Prevention (Excavation, Weather and Outside Force)
Near Miss / Good Catch	Service	Construction	53	53 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Inside Piping	Operations & Maintenance	63	63 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Operations & Maintenance	64	64 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Operations & Maintenance	65	65 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	67	67 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Operations & Maintenance	68	68 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Operations & Maintenance	69	69 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Operations & Maintenance	71	71 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Test Point	Operations & Maintenance	79	79 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Construction	86	86 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Steel Service	Operations & Maintenance	92	92 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Construction	98	98 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Construction	102	102 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Construction	105	105 - Damage Prevention (Excavation, Weather and Outside Force)
Near Miss / Good Catch	Main	Operations & Maintenance	108	108 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Operations & Maintenance	109	109 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Construction	111	111 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Construction	115	115 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Operations & Maintenance	118	118 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Operations & Maintenance	119	119 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	120	120 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Operations & Maintenance	121	121 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Operations & Maintenance	123	123 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Construction	124	124 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Operations & Maintenance	128	128 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Service	Construction	135	135 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Construction	137	137 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Main	Construction	140	140 - Damage Prevention (Excavation, Weather and Outside Force)
Near Miss / Good Catch	Main	Construction	141	141 - Damage Prevention (Excavation, Weather and Outside Force)
Pipeline Safety Incidents	Relight	Operations & Maintenance	144	144 - Damage Prevention (Excavation, Weather and Outside Force)

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Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	5	5 - Valve Operations and Maintenance
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	6	6 - Valve Operations and Maintenance
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	17	17 - Valve Operations and Maintenance
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	51	51 - Valve Operations and Maintenance
Pipeline Safety Incidents	Main	Operations & Maintenance	57	57 - Valve Operations and Maintenance
Pipeline Safety Incidents	PRE START UP SAFETY REVIEW	Operations & Maintenance	59	59 - Valve Operations and Maintenance
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	95	95 - Valve Operations and Maintenance
Pipeline Safety Incidents	Main	Construction	99	99 - Valve Operations and Maintenance
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	106	106 - Valve Operations and Maintenance
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	116	116 - Valve Operations and Maintenance
Pipeline Safety Incidents	Main	Operations & Maintenance	138	138 - Valve Operations and Maintenance
Pipeline Safety Incidents	Main	Operations & Maintenance	139	139 - Valve Operations and Maintenance

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Safety Alert	Main	Operations & Maintenance	8	8 - Materials, Equipment and Tools
Near Miss / Good Catch	Main	Construction	26	26 - Materials, Equipment and Tools
Pipeline Safety Incidents	Valve (excluding regulator/control valves)	Operations & Maintenance	66	66 - Materials, Equipment and Tools
Near Miss / Good Catch	Material / Equipment / Tools	Operations & Maintenance	80	80 - Materials, Equipment and Tools

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Pipeline Safety Incidents	Main	Operations & Maintenance	13	13 - Corrosion Control
Pipeline Safety Incidents	Main	Construction	87	87 - Corrosion Control
Near Miss / Good Catch	Service	Operations & Maintenance	107	107 - Corrosion Control

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Pipeline Safety Incidents	Meter	Operations & Maintenance	15	15 - Customer Meter / Regulator Installation and Inspection
Near Miss / Good Catch	Inside Piping	Construction	18	18 - Customer Meter / Regulator Installation and Inspection
Pipeline Safety Incidents	Meter	Operations & Maintenance	56	56 - Customer Meter / Regulator Installation and Inspection

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Near Miss / Good Catch	Regulator/Control Valves	Operations & Maintenance	20	20 - Gate/Regulator Station Operations and Maintenance
Pipeline Safety Incidents	Regulator/Control Valves	Operations & Maintenance	25	25 - Gate/Regulator Station Operations and Maintenance
Pipeline Safety Incidents	Gas Transmission Pre Start Up Safety Review Not Completed for All Assets	Operations & Maintenance	39	39 - Gate/Regulator Station Operations and Maintenance
Pipeline Safety Incidents	regulator station damage	Operations & Maintenance	60	60 - Gate/Regulator Station Operations and Maintenance

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Pipeline Safety Incidents	Main	Operations & Maintenance	23	23 - Pipe Joining / Fusion Workmanship
Pipeline Safety Incidents	Tap Fitting	Construction	38	38 - Pipe Joining / Fusion Workmanship
Pipeline Safety Incidents	Main	Construction	40	40 - Pipe Joining / Fusion Workmanship
Pipeline Safety Incidents	Tap Fitting	Construction	44	44 - Pipe Joining / Fusion Workmanship
Pipeline Safety Incidents	Main	Operations & Maintenance	61	61 - Pipe Joining / Fusion Workmanship
Pipeline Safety Incidents	Main	Construction	72	72 - Pipe Joining / Fusion Workmanship
Pipeline Safety Incidents	Tap Fitting	Construction	73	73 - Pipe Joining / Fusion Workmanship
Regulatory Audit	Main	Construction	89	89 - Pipe Joining / Fusion Workmanship
Near Miss / Good Catch	Service	Construction	113	113 - Pipe Joining / Fusion Workmanship
Pipeline Safety Incidents	Tap Fitting	Construction	127	127 - Pipe Joining / Fusion Workmanship

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Pipeline Safety Incidents	Main	Operations & Maintenance	29	29 - Leak Detection (Including reduction and minimization)
Near Miss / Good Catch	Customer-owned piping	Operations & Maintenance	33	33 - Leak Detection (Including reduction and minimization)
Pipeline Safety Incidents	Main	Operations & Maintenance	81	81 - Leak Detection (Including reduction and minimization)
Pipeline Safety Incidents	Service	Operations & Maintenance	85	85 - Leak Detection (Including reduction and minimization)
Pipeline Safety Incidents	Main	Construction	110	110 - Leak Detection (Including reduction and minimization)
Pipeline Safety Incidents	Main	Operations & Maintenance	125	125 - Leak Detection (Including reduction and minimization)
Pipeline Safety Incidents	Odorization System	Operations & Maintenance	142	142 - Leak Detection (Including reduction and minimization)

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Pipeline Safety Incidents	Inside Meter	Construction	31	31 - Uprates
Pipeline Safety Incidents	Service	Construction	32	32 - Uprates

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Near Miss / Good Catch	Main	Construction	36	36 - Welding Practices
Internal QC Finding	Main	Construction	103	103 - Welding Practices

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Pipeline Safety Incidents	Main	Operations & Maintenance	45	45 - Work Zone and Excavation Safety
Near Miss / Good Catch	Service	Construction	47	47 - Work Zone and Excavation Safety
Pipeline Safety Incidents	Main	Operations & Maintenance	74	74 - Work Zone and Excavation Safety
Near Miss / Good Catch	Electric Pole	Construction	90	90 - Work Zone and Excavation Safety
Safety Alert	Meter	Operations & Maintenance	91	91 - Work Zone and Excavation Safety
Pipeline Safety Incidents	Main	Operations & Maintenance	97	97 - Work Zone and Excavation Safety
Pipeline Safety Incidents	Main	Operations & Maintenance	117	117 - Work Zone and Excavation Safety
Pipeline Safety Incidents	Service	Operations & Maintenance	122	122 - Work Zone and Excavation Safety

Lessons Learned Archive

Overpressure and/or Unintended Loss of Pressure​

Damage Prevention (Excavation, Weather and Outside Force)​

Valve Operations and Maintenance​

Materials, Equipment and Tools​

Corrosion Control ​

Customer Meter / Regulator Installation and Inspection ​

Gate/Regulator Station Operations and Maintenance ​

Pipe Joining / Fusion Workmanship​

Leak Detection (Including reduction and minimization)​

Uprates​

Welding Practices ​

Work Zone and Excavation Safety​

Overpressure and/or Unintended Loss of Pressure

Damage Prevention (Excavation, Weather and Outside Force)

Valve Operations and Maintenance

Materials, Equipment and Tools

Corrosion Control

Customer Meter / Regulator Installation and Inspection

Gate/Regulator Station Operations and Maintenance

Pipe Joining / Fusion Workmanship

Leak Detection (Including reduction and minimization)

Uprates

Welding Practices

Work Zone and Excavation Safety