Aliso Canyon Community Notifications

Browse the archive of Community Notifications from the Aliso Canyon natural gas storage facility.

Community Notifications are issued when SoCalGas reports a release of materials to state agencies.

Date Details
October 14, 2019
Between 3pm and 3:30pm today SoCalGas’ NO. 3 fence-line monitor at the Aliso Canyon storage facility recorded elevated methane readings. Those readings were NOT caused by a natural gas leak. They were caused by maintenance work on the monitor. There are no indications of elevated methane readings or a natural gas leak at the facility.
October 11, 2019
SoCalGas is aware that the fence-line methane monitors at Aliso Canyon recorded elevated readings overnight. At this time it appears that the elevated readings were caused by heat and smoke from the Saddleridge fire and NOT a natural gas leak at the facility. Once the facility evacuation is lifted, crews will assess any damage to the facility. Based on information known at this time, there are no indications of leaks at the facility.
June 21, 2018
Around 8:20 a.m., one of the fence-line methane monitoring points at Aliso Canyon registered a reading of 8.1 ppm. The reading was caused by fog and humidity. Following normal procedures, SoCalGas crews performed an infrared survey of the Aliso Canyon facility and did not find any elevated concentrations of methane. No other Fence-Line monitors recorded elevated methane levels at that time. There are no indications of elevated methane levels at the fence line.
December 18, 2017
This evening at approximately 4:55 p.m., there was an unplanned release of natural gas at the Aliso Canyon Natural Gas Storage Facility. 

The release occurred during a routine operation to pressurize equipment following maintenance. The equipment is used in the dehydration process that removes water from natural gas. A flange gasket on the equipment did not function properly resulting in the release. Immediate actions were taken to control the release, and it was stopped within approximately 50 minutes. The release did not present a health or safety risk to the community. However, the odor may have been noticeable to people near the facility.
 
In addition, the release was detected on the fence-line monitoring system along the border with the community. The highest reading on the fence-line monitors was approximately 66 parts per million.  Since the release was stopped those readings have returned to normal levels.  The online portal that allows community members to view data from the fence-line monitoring system is currently off-line. SoCalGas is troubleshooting the cause of the website outage.
 
SoCalGas has notified the appropriate state and local agencies about the release. 
December 1, 2017
This evening, SoCalGas operators noted an increase in methane levels on two fence-line monitors along the border with the community.  
 
The brief elevated methane levels lasted about 20 minutes and do not present a health or safety risk to the community. These elevated readings are related to planned venting associated with maintenance work being conducted at the facility. The maintenance is part of the final stages of a project to upgrade the compressors at the facility. SoCalGas has also provided notifications to the relevant state and local agencies. 
November 21, 2017 At approximately 7:00 pm on Tuesday, November 21, 2017, SoCalGas operators noted an increase in methane levels on two of the fenceline monitors along the border with the community. The slightly elevated readings are related to planned maintenance work being conducted at the facility. The slightly elevated methane levels do not present a health or safety risk to the community.
October 17, 2017
On October 18, 2017, SoCalGas will be implementing upgrades to the fence-line monitoring system at the Aliso Canyon Storage Facility. This will result in intermittent gaps in the data posted to the fence-line Monitoring Website. During these periods, the fence-line will be monitored by trained SoCalGas Operators.
 
The following advanced monitoring systems will continue as scheduled:
  • Around-the-clock pressure monitoring of all wells at our 24-hour operations center.
  • Daily patrols examining every active well with the use of sensitive infrared thermal imaging cameras that can detect leaks.
October 14, 2017
The area where the Fence Line monitor indications occurred on October 13, 2017 was investigated as soon as the readings were received and no indications of methane were detected.  SoCalGas technicians are working to correct fence line monitor equipment issues that have been identified as the cause.
October 13, 2017 At approximately 2:40 am on Friday, October 13, 2017, a reading of 24.9 ppm methane was registered at Aliso Canyon Fence-Line monitoring location.  Within 20 minutes of this sudden spike, the indicated methane read had returned to 2 ppm.  At approximately 7:20 am a second reading of 17.9 ppm methane was registered.  SoCalGas crews investigated both indications, performed an infrared survey of the Aliso Canyon facility and did not find any elevated concentrations of methane.  No other Fence-Line monitors recorded elevated methane levels at that time.  The cause of the anomaly is being investigated.
October 8, 2017
10:51 p.m.
SoCalGas notified customers about a minor release of natural gas caused by a malfunction of a relief valve at an aboveground, oil storage tank located at the Aliso Canyon storage facility. Crews successfully stopped the release and final repairs to the valve were completed at 9:40 p.m.

There have been no indications of elevated methane levels at the eight pairs of fence-line monitors along the perimeter with the community. There was no health or safety risk to Porter Ranch or the surrounding communities. SoCalGas has notified regulators and appropriate agencies. 
October 8, 2017
5:23 p.m.
SoCalGas crews conducting regular daily inspections discovered a malfunction on a relief valve at an aboveground, oil storage tank located at the Aliso Canyon storage facility. As a result of the malfunction, there is a minor release of natural gas. The natural gas is not from the storage field; it is in the oil tank and is a byproduct of oil production. Crews are working to repair the valve and to stop the release of natural gas.

Small amounts of oil are produced during normal operations at the Aliso Canyon natural gas storage facility. That oil is temporarily stored in tanks, and small amounts of natural gas rise to the top of those tanks. The valve that malfunctioned is located on one of the oil storage tanks. No oil or other liquids have been spilled or released to the environment as a result of the natural gas release.

The release of natural gas is minor and is not associated with an underground storage well or any of the pressurized pipelines at the facility. The oil tank is more than a mile from the community. In addition, there have been no indications of elevated methane levels at the eight pairs of fence-line monitors along the perimeter with the community. There is no risk to the health and safety of Porter Ranch and the surrounding community. SoCalGas has notified the appropriate regulators and agencies.
September 15, 2017
Installation of wind monitors at each of the eight infrared methane monitor posts that surround the Aliso Canyon natural gas storage facility is scheduled to begin next week and is expected to continue over the next 2-3 weeks. During the installation of the wind monitor at each site, the associated infrared methane monitor will be electronically set to “maintenance mode”. Staff will be constantly monitoring the installation efforts from onsite and the operations center.
 
The following advanced monitoring systems will continue as scheduled:
 
  • Around-the-clock pressure monitoring of all wells at our 24-hour operations center.
  • Daily patrols examining every active well with the use of sensitive infrared thermal imaging cameras that can detect leaks.
September 13, 2017 At approximately 4:55 am on Tuesday September 12, 2017, a reading of 6.8 ppm methane was registered at Aliso Canyon Fence-Line monitoring location 8. Within 10 minutes, the methane level detected returned to 2 ppm. During the anomaly, high humidity levels accompanied with lower temperatures were recorded. High humidity can interfere with the signal between the source and the receiver electronics, resulting in the reporting of small amounts of methane. SoCalGas performs a daily infrared survey of the Wells and Facility at Aliso Canyon. No elevated concentrations of methane were detected during the course of the survey. As a precaution, the methane monitor was replaced.
August 11, 2017
Around 9:00 p.m. on Thursday August 10, 2017, one of the Fence-Line methane monitoring points at Aliso Canyon registered a sudden spike in levels. A level of 10.1 ppm was registered at monitoring location 8. Within 10 minutes of this sudden spike, the methane level detected had returned to 2 ppm. SoCalGas crews performed the daily infrared survey of the Aliso Canyon facility and did not find any elevated concentrations of methane. No other Fence-Line monitors recorded elevated methane levels at that time.
August 11, 2017
Installation of access platforms at each of the eight infrared methane monitor posts that surround the Aliso Canyon natural gas storage facility will continue over the next 2-3 weeks (see June 27, 2017 below). During the installation at the specific monitoring site, the associated monitor will be electronically set to “maintenance mode”. Staff will be constantly monitoring the construction efforts from onsite and the operations center.
 
The following advanced monitoring systems will continue as scheduled:
 
  • Around-the-clock pressure monitoring of all wells at our 24-hour operations center.
  • Daily patrols examining every active well with the use of sensitive infrared thermal imaging cameras that can detect leaks.
July 18, 2017
On Sunday July 23, 2017, from 6 - 8 a.m., the Aliso Canyon Infrared Fence-Line Methane-Monitoring System will be undergoing planned IT maintenance and will be unavailable. Data from the eight infrared monitors will continue to be captured, and no gap in data is expected. During this planned IT maintenance, the following advanced monitoring systems will continue as scheduled:
 
  • Around-the-clock pressure monitoring of all wells at our 24-hour operations center.
  • Daily patrols examining every active well with the use of sensitive infrared thermal imaging cameras that can detect leaks.
June 27, 2017
Beginning Wednesday, June 28, 2017, SoCalGas will be installing access platforms at each of the eight infrared methane monitor posts that surround the Aliso Canyon natural gas storage facility. The access platforms will be installed inside of the infrared methane monitor chain-link security fence. Construction will take place over the next 4-6 weeks. During the installation at the specific monitoring site, the associated monitor will be electronically set to “maintenance mode”. Staff will be constantly monitoring the construction efforts from onsite and the operations center.
 
The following advanced monitoring systems will continue as scheduled:
 
  • Around-the-clock pressure monitoring of all wells at our 24-hour operations center.
  • Daily patrols examining every active well with the use of sensitive infrared thermal imaging cameras that can detect leaks.
June 3, 2017
Continuing with our commitment to transparency and community partnership, we would like to provide an update on the Crimson Oil pipeline leak. Crimson Oil is a third party company that operates on the Aliso Canyon property.
 
This morning, Saturday, June 3, SoCalGas received confirmation from the LA County Fire Department that Crimson stopped the leak and completed permanent repairs.
 
Crimson is not affiliated with SoCalGas or Sempra Energy and SoCalGas does not control or operate Crimson’s facilities at Aliso Canyon.
 
We hope you find this information to be helpful. If you have further questions about the status of Crimson Oil’s operation, please contact Crimson Oil at 303-892-9333 or DOGGR at 916-445-9686.
 
For your reference, the Cal OES Report regarding Crimson’s issue can be found  here.
June 1, 2017
In the spirit of community partnership and transparency, SoCalGas would like to make you aware of an issue involving Crimson Oil, an independent third party company that operates on the Aliso Canyon property.  Crimson is not affiliated with SoCalGas or Sempra Energy and SoCalGas does not control or operate Crimson’s facilities at Aliso Canyon.
 
Although SoCalGas is not responsible for monitoring Crimson’s facilities, SoCalGas personnel observed emissions from a threaded fitting on a pipeline owned and operated by Crimson and informed Crimson. SoCalGas subsequently observed an open valve on a well operated by Crimson, and the valve was releasing gas to atmosphere. 
 
SoCalGas employees took proactive steps to minimize the emissions from Crimson’s facilities, notified Crimson and alerted the appropriate regulatory agencies. Crimson informed us that they would fix the leak.
 
For your reference, the notification we made to the agencies about Crimson’s issue can be found  here.
May 17, 2017
Beginning Wednesday, May 17, 2017 at 7 a.m. and lasting through the end of the week, SoCalGas will be conducting planned maintenance on the eight infrared methane monitor posts that surrounds the Aliso Canyon natural gas storage facility.
 
During this time, all of the monitors will be turned to “maintenance mode” while the system is worked on one post at a time. Staff will be on site at each of the monitor locations while this work is taking place. The following advanced monitoring systems will continue as scheduled:
 
  • Around-the-clock pressure monitoring of all wells in a 24-hour operations center;
  • Daily patrols to examine every well are conducted four times each day; and
  • Daily scanning of each well using sensitive infrared thermal imaging cameras that can detect leaks.
May 8, 2017
This morning at 6:20am, Monitor No. 6 at the Aliso Canyon Infrared Fence-Line Methane Monitoring System registered an increase in methane levels to 6.3 ppm. The increased methane level was caused by a very brief release of natural gas from a relief valve on a surface pipeline. The release did not occur at a well. Crews are onsite inspecting the equipment and no additional releases are expected. The brief increase in the methane level did not present a safety or health risk to the community and did not reach reportable levels.   
April 11, 2017
On Monday Apr. 10, 2017 one of Aliso Canyon’s fence line monitors registered a false positive for elevated methane levels. Between 7am and approximately 8:40am monitor No. 3 displayed elevated methane levels. Consistent with our operating protocols, technicians responded immediately and sampled the area with three different types of handheld methane detectors. The handheld equipment showed methane levels were normal. There was no release of methane. A preliminary assessment determined that moisture formed inside the lens of the monitor following rain and several days of fog, resulting in the false positive reading. The unit was taken off line, maintenance was performed, and it was placed back into service at approximately 11am. SoCalGas is working to enhance the monitors to address moisture and is increasing the frequency of maintenance to enhance their reliability.
March 17, 2017
9:05 PM
 
Earlier, SoCalGas crews conducting regular daily inspections discovered a minor leak on an 8 inch above-ground pipeline at its Aliso Canyon storage facility. The pipeline is not in a well.  The leak was safely stopped at 7:40 PM.
March 17, 2017
6:20 PM
This afternoon, SoCalGas crews conducting regular daily inspections discovered a minor leak on an 8 inch above-ground pipeline at its Aliso Canyon storage facility. The pipeline is not in a well. Crews are in the process of isolating the pipeline to stop the release of natural gas. The release is minor and does not pose a risk to safety, health or the environment. Methane detection levels on the fence line monitoring system are normal.
 
Once the line is isolated and the release is stopped, crews will initiate repairs.
 
You are receiving this notification as a courtesy, consistent with SoCalGas’ commitment to transparency in our operations.
March 7, 2017
11:00 AM
This is an update to this morning’s notification. The salt water solution released from a tank at the Aliso Canyon storage facility earlier this morning consists of 97 percent fresh water and three percent potassium chloride, a common salt compound. Los Angeles County HAZMAT has confirmed that the fluid did not impact the creek or any waterways. The fluid was stopped at approximately 3:30 AM.
 
The fluid does not present a health hazard and there is no risk to the community.
 
The fluid is used by crews to isolate wells from the storage reservoir and allows them to safely perform work on the wells.
 
SoCalGas has notified the appropriate agencies. This notification is being made consistent with SoCalGas' commitment to transparency in our operations and keeping members of the community informed.
March 7, 2017
8:00 AM
Early this morning a salt water solution used for well work spilled from a tank at the Aliso Canyon natural gas storage facility. Preliminary information is that approximately three to five barrels of the solution was released and some of the fluid may have entered a culvert that drains into a nearby creek. The fluid was stopped at approximately 3:30 AM.
 
The fluid is used by crews to isolate wells from the storage reservoir and allows them to safely perform work on the wells. It does not present a health hazard and there is no risk to the community.
 
SoCalGas has notified the appropriate agencies. This notification is being made consistent with SoCalGas' commitment to transparency in our operations and keeping members of the community informed.
January 5, 2017 Earlier today the following was reported by a third party construction contractor at the Aliso Canyon Turbine Replacement (ACTR) site to the California Office of Emergency Services (OES):

“At approximately 8:00 AM, approximately 2 gallons of diesel fuel was released from a construction contractor’s fuel storage tank at the Aliso Canyon Turbine Replacement (ACTR) Project construction site while the tank was being filled by a fuel distributor. Due to considerable rainfall that has occurred onsite, a portion of the diesel fuel escaped a secondary spill containment area surrounding the tank and entered a storm drain which leads to Limekiln creek.  The release was reported to Cal-OES by the construction contractor.  The Los Angeles County Department of Public Works and the Los Angeles City Sanitation District responded to the site.”
December 28, 2016
On Saturday, December 24, 2016, as part of daily patrols and inspections, crews using infra-red camera technology observed intermittent indications of very slight releases of methane from a 2-inch opening at the SS25 wellhead at the Aliso Canyon Storage facility. 
 
On December 28, SoCalGas installed a valve on the 2-inch threaded connection where methane was detected, stopping the slight release of gas. At approximately 10:45 AM SoCalGas inspected the site using an infra-red camera and confirmed that the slight release of methane has stopped. This inspection was observed by the California Public Utilities Commission.
 
Yesterday, SoCalGas connected highly sensitive flow measurement equipment and confirmed that approximately one cubic foot of gas was released between December 24 and December 27. For additional context -  A standard home pilot light on a water heater consumes about 12 cubic feet per day, more than 10 times the amount released over the last four days. The connection of measurement equipment and the collection of measurement data were observed by the California Public Utilities Commission.
 
As the Division of Oil, Gas and Geothermal Resources (DOGGR) first reported after the leak at SS25 was permanently sealed in February, some methane may emit from the soil around the site.  According to DOGGR, "some amount of residual methane trapped in the soil is expected to seep out of the ground around the leaking well after the well is successfully controlled and then sealed."
 
Observations indicate that recent intense rain storms triggered the very slight releases of methane previously trapped in the soil following last year’s leak at the site. Consistent with DOGGR’s expectations, slight releases may still occur at different locations near SS25.
 
All fenceline data as well as data from a vehicle-mounted monitoring device show that methane levels at the fenceline and in the community remain normal and there was no impact to the community.
 
Yesterday, The South Coast Air Quality Management District AQMD also reported that the agency had not detected elevated levels of methane in the community.
 
Since the minor release was first observed on December 24, SoCalGas has provided regular updates to the community, neighborhood council, community advisory council, and local and state elected officials, as well as appropriate agencies, including the Division of Oil, Gas and Geothermal Resources, California Public Utilities Commission, and the California Office of Emergency Service.
December 27, 2016
On Saturday, December 24, 2016, as part of daily patrols and inspections, crews using infra-red camera technology observed intermittent indications of very slight releases of methane from a 2-inch opening near the SS25 wellhead at the Aliso Canyon Storage facility. 
 
SoCalGas connected highly sensitive flow measurement equipment today to calculate the slight volume of gas released since Saturday.  Measurements taken twice today confirm that less than one cubic foot of gas has been released since December 24 – barely enough to make half a pot of coffee.
 
For additional context - A standard home pilot light on a water heater consumes about 12 cubic feet per day, more than 10 times the amount released over the last four days. The equipment measured the release at between .11 cubic feet per day to .23 cubic feet per day. The connection of measurement equipment and the collection of measurement data were observed by the California Public Utilities Commission.
 
SoCalGas continues to monitor the area using two different infra-red technologies and mobile detection technologies.
 
All fenceline data as well as data from a vehicle mounted monitoring device show that methane levels at the fenceline and in the community remain normal and there is no impact to the community.
 
Earlier today, The South Coast Air Quality Management District AQMD also reported that the agency had not detected elevated levels of methane in the community.
 
There is no detectable odor at the site or elsewhere at the facility. 
 
A statement issued by the Division of Oil, Gas and Geothermal Resources (DOGGR) after the leak was permanently sealed in February anticipated that some methane may emit from the soil around the site.  According to the statement, "Some amount of residual methane trapped in the soil is expected to seep out of the ground around the leaking well after the well is successfully controlled and then sealed."
 
Observations indicate that recent intense rain storms triggered the very slight releases of methane previously trapped in the soil following last year’s leak at the site.
 
SoCalGas promptly notified the community, neighborhood council, community advisory council, and local and state elected officials, as well as appropriate agencies, including the Division of Oil, Gas and Geothermal Resources, California Public Utilities Commission, and the California Office of Emergency Service.
December 26, 2016
On Saturday, December 24, 2016, as part of our daily patrols and inspections, crews using infra-red camera technology observed very slight and intermittent indication of methane from a 2-inch opening near the SS25 wellhead at the Aliso Canyon Storage facility.  The methane releases are very slight and are not sufficient to pose a present or potential hazard to human health, safety or the environment.  The highly sensitive infra-red camera images indicate an amount similar to the wisping vapors of a single table candle.  The small amount is below levels that can be measured at this time. 
 
There is no detectable odor at the site or elsewhere at the facility.  Methane levels are normal as measured by infrared fenceline monitors and mobile detection equipment technology.  All monitoring indicates that the slight methane releases are localized to the well site and that levels in the community remain normal.
 
Observations indicate that recent intense rain storms triggered the very slight release of methane previously trapped in the soil following last year’s leak at the site.
 
SoCalGas promptly notified the appropriate agencies, including the Division of Oil, Gas and Geothermal Resources, California Public Utilities Commission, and the California Office of Emergency Service, and continues to work with regulators to monitor the condition.
December 25, 2016
The following update was provided to OES this morning:
 
"Monitoring continued through the night.  Methane reads dipped temporarily, then returned to initial levels, indicating slight off-gassing is continuing.  No other anomalies have been noted in the vicinity. There are no detectable odors and there is no indication of a present or potential hazard to human health, safety or the environment.”
 
SoCalGas continues to work with the appropriate agencies and regulators. 
December 24, 2016
Earlier today we reported the following to the California Office of Emergency Services (OES). 
 
“Today (12/24/16), at approximately 7:45 am, as part of our daily patrols and inspections, a very slight and intermittent observation of methane was detected utilizing infra-red camera technology (FLIR) at the SS25 wellhead at the Aliso Canyon Storage facility.  We believe this is a continuation of off-gassing from the soil that has previously been observed at other locations at the site.  This recent off-gassing of the soil coincides with the recent intense rain events at the site and is not believed to pose a present or potential hazard to human health, safety or the environment.  The initial observation was confirmed through follow-up inspections completed at approximately 10:30 am, and SoCalGas will continue to monitor the site throughout the day.  No anomalies have been detected through other monitoring techniques, including the fenceline monitoring system and visual inspections, and there is no discernible odor at the site.” 
 
SoCalGas has notified the appropriate agencies and continues to work with regulators.