Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2020-09-24 — SD
Operator
Midamerican Energy Company
Cause
Notification Issue
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$679
Incident datetime
2020-09-24 21:36
Report number
Location
SD, MINNEHAHA
Narrative
Bx civil & construction (third party contractor) was doing fine grading in preparation for installing curb and gutter along beach avenue in dell rapids, south dakota on the evening of september 24, 2020. Previous street grading by zacharias construction, inc. Had lowered the street grade significantly (approximately 36") and reduced the cover over a two inch plastic natural gas main to approximately one inch. Midamerican energy was not aware that the street grade had been reduced to a level that would conflict with the existing facilities prior to the event. The machine scraped along the top of the main until it broke through releasing natural gas at 43 psig under the machine. The gas ignited and the fire department responded. Midamerican energy was notified at 21:36 and arrived on site at 22:17. The main was squeezed off at approximately 23:15 shutting off the flow of gas to the fire. The excavator's equipment, 5700c power curber, was assessed for damage the next morning and it was determined that the extent of damage was estimated to be $350,000. Once the estimate of damage was determined to be in excess of $50,000, the nrc was notified (report 1288248). There were no injuries, the gas did not explode, and one house was evacuated by the excavator as a precaution. Subsequent nrc reports associated with this incident are 1288388 for a correction on the date and 1288446 for the 48 hour follow up.
Detailed record list
Occurred At
2020-09-24 21:36:00
Year
2020
Report Received Date
2020-10-21 00:00:00
Iyear
2020.0
Report Number
20200101.0
Supplemental Number
34454.0
Report Type
Supplemental Final
Operator Id
30750
Name
Midamerican Energy Company
Operator Street Address
401 Douglas Street Po Box 778
Operator City Name
Sioux City
Operator State Abbreviation
IA
Operator Postal Code
51101
Local Datetime
2020-09-24 21:36:00
Location Street Address
400 Beach Avenue
Location City Name
Dell Rapids
Location County Name
Minnehaha
Location State Abbreviation
SD
Location Postal Code
57022
Location Latitude
43.82347
Location Longitude
-96.70168
Nrc Rpt Datetime
2020-09-25 11:33:00
Nrc Rpt Num
1288248
Commodity Released Type
Natural Gas
Unintentional Release
10.7
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
Yes
Explode Ind
No
Num Pub Evacuated
3.0
Incident Identified Datetime
2020-09-24 21:36:00
On Site Datetime
2020-09-24 22:17:00
Federal
No
Location Type
Public Property
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
1.0
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Main
Installation Year
1994.0
Pipe Diameter
2.0
Pipe Specification
Astm D2513
Pipe Manufacturer
Plexco
Material Involved
Plastic
Plastic Type
Polyethylene (Pe)
Plastic Sdr
11
Material Pe Pipe Code
2406
Release Type
Mechanical Puncture
Puncture Axial
21.0
Puncture Circum
1.5
Class Location Type
Class 3 Location
Est Cost Oper Paid
350000.0
Est Cost Prop Damage
679.0
Est Cost Emergency
4576.0
Est Cost Other
0.0
Est Cost Unintentional Release
22.0
Prpty
355277.0
Commercial Affected
1.0
Industrial Affected
0.0
Residences Affected
0.0
Accident Psig
43.0
Normal Psig
45.0
Mop Psig
50.0
Accident Pressure
Pressure Did Not Exceed Maop
Scada In Place Ind
No
Accident Identifier
Notification From Emergency Responder
Investigation Status
No, the facility was not monitored by a controller(s) at the time of the incident
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Excavation Damage
Cause Details
Excavation Damage By Third Party
Ex Party Type
Excavation Damage By Third Party
Prior Notification Ind
No
Notify Cga Dirt
Yes
Public Row Ind
Yes
Public Subtype
City Street
Excavator Type
Contractor
Excavator Equipment
Unknown/other
Work Performed
Curb/sidewalk
One Call Notified Ind
No
Service Interruption
Yes
Service Interruption Hours
18.0
Root Cause Category
Notification Issue
Root Cause Type
No Notification Made To The One-Call Center/811
Preparer Name
C********** R* P****
Preparer Title
Senior Engineer
Preparer Email
C**********@m**********.com
Preparer Telephone
712-277-7941
Authorizer Name
D*** S******
Authorizer Title
Vice President Gas Delivery
Authorizer Telephone
515-242-4274
Authorizer Email
D***********@m**********.com
Narrative
Bx civil & construction (third party contractor) was doing fine grading in preparation for installing curb and gutter along beach avenue in dell rapids, south dakota on the evening of september 24, 2020. Previous street grading by zacharias construction, inc. Had lowered the street grade significantly (approximately 36") and reduced the cover over a two inch plastic natural gas main to approximately one inch. Midamerican energy was not aware that the street grade had been reduced to a level that would conflict with the existing facilities prior to the event. The machine scraped along the top of the main until it broke through releasing natural gas at 43 psig under the machine. The gas ignited and the fire department responded. Midamerican energy was notified at 21:36 and arrived on site at 22:17. The main was squeezed off at approximately 23:15 shutting off the flow of gas to the fire. The excavator's equipment, 5700c power curber, was assessed for damage the next morning and it was determined that the extent of damage was estimated to be $350,000. Once the estimate of damage was determined to be in excess of $50,000, the nrc was notified (report 1288248). There were no injuries, the gas did not explode, and one house was evacuated by the excavator as a precaution. Subsequent nrc reports associated with this incident are 1288388 for a correction on the date and 1288446 for the 48 hour follow up.
| Occurred At | 2020-09-24 21:36:00 |
|---|---|
| Year | 2020 |
| Report Received Date | 2020-10-21 00:00:00 |
| Iyear | 2020.0 |
| Report Number | 20200101.0 |
| Supplemental Number | 34454.0 |
| Report Type | Supplemental Final |
| Operator Id | 30750 PHMSA Enforcement |
| Name | Midamerican Energy Company |
| Operator Street Address | 401 Douglas Street Po Box 778 |
| Operator City Name | Sioux City |
| Operator State Abbreviation | IA |
| Operator Postal Code | 51101 |
| Local Datetime | 2020-09-24 21:36:00 |
| Location Street Address | 400 Beach Avenue |
| Location City Name | Dell Rapids |
| Location County Name | Minnehaha |
| Location State Abbreviation | SD |
| Location Postal Code | 57022 |
| Location Latitude | 43.82347 Google Maps OpenStreetMap |
| Location Longitude | -96.70168 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2020-09-25 11:33:00 |
| Nrc Rpt Num | 1288248 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 10.7 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | Yes |
| Explode Ind | No |
| Num Pub Evacuated | 3.0 |
| Incident Identified Datetime | 2020-09-24 21:36:00 |
| On Site Datetime | 2020-09-24 22:17:00 |
| Federal | No |
| Location Type | Public Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 1.0 |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Main |
| Installation Year | 1994.0 |
| Pipe Diameter | 2.0 |
| Pipe Specification | Astm D2513 |
| Pipe Manufacturer | Plexco |
| Material Involved | Plastic |
| Plastic Type | Polyethylene (Pe) |
| Plastic Sdr | 11 |
| Material Pe Pipe Code | 2406 |
| Release Type | Mechanical Puncture |
| Puncture Axial | 21.0 |
| Puncture Circum | 1.5 |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 350000.0 |
| Est Cost Prop Damage | 679.0 |
| Est Cost Emergency | 4576.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 22.0 |
| Prpty | 355277.0 |
| Commercial Affected | 1.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 0.0 |
| Accident Psig | 43.0 |
| Normal Psig | 45.0 |
| Mop Psig | 50.0 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Scada In Place Ind | No |
| Accident Identifier | Notification From Emergency Responder |
| Investigation Status | No, the facility was not monitored by a controller(s) at the time of the incident |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Excavation Damage |
| Cause Details | Excavation Damage By Third Party |
| Ex Party Type | Excavation Damage By Third Party |
| Prior Notification Ind | No |
| Notify Cga Dirt | Yes |
| Public Row Ind | Yes |
| Public Subtype | City Street |
| Excavator Type | Contractor |
| Excavator Equipment | Unknown/other |
| Work Performed | Curb/sidewalk |
| One Call Notified Ind | No |
| Service Interruption | Yes |
| Service Interruption Hours | 18.0 |
| Root Cause Category | Notification Issue |
| Root Cause Type | No Notification Made To The One-Call Center/811 |
| Preparer Name | C********** R* P**** |
| Preparer Title | Senior Engineer |
| Preparer Email | C**********@m**********.com |
| Preparer Telephone | 712-277-7941 |
| Authorizer Name | D*** S****** |
| Authorizer Title | Vice President Gas Delivery |
| Authorizer Telephone | 515-242-4274 |
| Authorizer Email | D***********@m**********.com |
| Narrative | Bx civil & construction (third party contractor) was doing fine grading in preparation for installing curb and gutter along beach avenue in dell rapids, south dakota on the evening of september 24, 2020. Previous street grading by zacharias construction, inc. Had lowered the street grade significantly (approximately 36") and reduced the cover over a two inch plastic natural gas main to approximately one inch. Midamerican energy was not aware that the street grade had been reduced to a level that would conflict with the existing facilities prior to the event. The machine scraped along the top of the main until it broke through releasing natural gas at 43 psig under the machine. The gas ignited and the fire department responded. Midamerican energy was notified at 21:36 and arrived on site at 22:17. The main was squeezed off at approximately 23:15 shutting off the flow of gas to the fire. The excavator's equipment, 5700c power curber, was assessed for damage the next morning and it was determined that the extent of damage was estimated to be $350,000. Once the estimate of damage was determined to be in excess of $50,000, the nrc was notified (report 1288248). There were no injuries, the gas did not explode, and one house was evacuated by the excavator as a precaution. Subsequent nrc reports associated with this incident are 1288388 for a correction on the date and 1288446 for the 48 hour follow up. |
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