Since 1960, Southern California Gas Company (“SoCaIGas”) has owned much of the land that comprises Sullivan Canyon (more than 4 miles in length). This property is used as a corridor for two transmission pipelines that provide Los Angeles residents with a safe and reliable supply of natural gas. Periodically, SoCalGas must perform maintenance on these pipelines. The purpose of this letter is to provide information on pipeline maintenance and repair work that will occur in the coming weeks.
SoCalGas will conduct a hydrostatic pressure test on a segment of one of our natural gas transmission pipelines in Sullivan Canyon. Hydrostatic pressure testing is a process that uses water to exert pressure on a pipeline at levels greater than its usual operating pressure to assess its soundness, often referred to as its integrity.
This test involves digging around the underground pipeline and safely venting natural gas from the pipeline. We will then fill the pipeline with water, and increase the pressure to a level that is higher than the pipeline’s normal operating pressure. If the pipe holds the pressure without any leaks, it will be put back in service. If the pipeline leaks during the test, SoCalGas will repair the pipeline and retest it, or replace it with new, pre-tested pipeline.
What to expect
The construction work will take place at several locations starting west of the Sullivan Canyon trailhead at the end of Queensferry Road and about a quarter-mile northwest of the trailhead. Work will begin in June 2014, and last about four to six weeks, although weather and other factors affecting safe working conditions could change the schedule. Normal work days will be Monday through Friday 7:00 a.m. to 7:00 p.m., however, some activities may extend the hours.
Test Start Location:
At Sullivan Canyon Trailhead at Queensferry Road, a test-start location will be staged just west of the trail with an excavation site, water tanks, and other equipment. This area will be closed to the public.
Test End Location:
About a quarter-mile northwest of the trailhead, a test-end location with excavation site and support equipment will be staged alongside the trail. This area will also be closed to the public.
Hikers, bikers, and others traversing the trail should use caution while passing by both test site locations. For safety reasons, Sullivan Canyon Trail will not be accessible by the public on the actual test day for the duration of the test. Check local signage with updates on construction activity.
The local community may notice truck traffic bringing test equipment and water tanks to the test sites and then removing them. Nearby residents may hear some work-related noise.
Your gas service should continue without interruption. If that changes, a SoCalGas representative will contact you.
The odor of natural gas
At times, you may smell the odor of natural gas and hear a loud, steady noise as we vent natural gas from the pipeline using safe and common techniques. Although this is normal when crews are working, we encourage anyone who has concerns about the smell of gas to call us from a safe location at 1-800-427-2200. We are available 24 hours a day, seven days a week.
We apologize for any inconvenience while we’re performing this test and appreciate your patience and cooperation.
Public Affairs Manager – Southern California Gas Company
Tel: (213) 244-4633