Projects & Issues

PG&E Pipelines at Stanford


Since the gas pipeline explosion in San Bruno, Stanford staff have been following the investigation and meeting with PG&E to ensure that all appropriate actions are being taken for campus safety. The web site provides information on some of the resources available to the Stanford community to stay informed.

Two gas transmission pipelines run along and through Stanford property. These are designated Line 109 and Line 132. Line 132 is the same one whose failure caused the tragedy in San Bruno.
Gas pipelines fall into one of three categories:

  1. Gas Transmission Pipelines - Main supply lines for natural gas. Generally large pipes (12 inches in diameter and larger) operating high pressures (greater than 60 psig).
  2. High Pressure Gas Lines - Pipelines that distribute natural gas from the transmission system to local users. They operate at up to 60 psig, and are generally less than 12 inches in diameter.
  3. Gas Service Pipe - These pipes bring natural gas into households and operate at very low pressures, and a generally small diameter.

 

PG&E Pipeline Updates:

If you have questions or concerns abotu this work, please contact Denise Alexander with PG&E Customer Impact at denise.alexander@pge.com or by phone at (415) 516-0238.

 

Stanford Gas Pipeline Work Update from PG&E, May 20, 2013

Pressure testing of the tap lines on Stanford Ave and north of Santa Maria were successfully completed last Friday. On May 22 we plan to tie the new taps into the system at both locations. Compressed Natural Gas (CNG) will be used to maintain gas service. The CNG trailers will be parked on the north side of Stanford Ave behind K Rails and off the road north of Santa Maria.
Work on the tap line west of JSB at Page Mill is required at night due to permit restrictions to minimize traffic congestion. The bulk of the work is complete so the noise issue should subside. Completion of this tap work is expected this week. No CNG is required for the tie in.

Hydro test of the new 24” pipe at Matadero Creek is scheduled for May 22.

Clearance and tie in of all new main lines is scheduled for May 28 – May 31. None of this work is expected to require CNG.

 

Stanford Gas Pipeline Work Update from PG&E, April 24, 2013

159' of 24" main line has been installed on the north side of Matadero Creek. This section is not backfilled yet but will be completed along with an additional 160' by end of this week.

400' of the 2" tap line on Stanford Avenue has been installed and an additional 100' section will be installed by Friday 4/26. Parking restrictions will be lifted for this portion of the work on Stanford Avenue once completed.

PG&E will be closing the right hand lane and the bicycle lane on Northbound Foothill Expressway between Hillview Ave. and Page Mill Rd. in Palo Alto, Monday through Saturdays from 9AM to 4:30PM starting 4/11/13 until 6/15/13. Additionally, PG&E will also be closing these lanes the entire weekend of May 4th starting Friday Night, May 3rd at 9PM to Monday Morning, May 6th 5AM

Updated Schedule:

4/29 - 5/6: The 4" tap line north of Santa Maria Avenue will be constructed. This work will include Junipero Serra Boulevard (JSB) traffic lane shifts but should not require lane closures to complete.

5/3 - 5/5: Next Friday evening at 9PM, 24 hour round the clock excavation work will begin, with 2-12 hour shifts to complete excavation and slide rail shoring installation at both Matadero Creek bore and receiving pits. In order to facilitate required schedule limitations, the majority of crews and will be off work Thursday 5/2 and Friday day 5/3, so very minor work will occur during those two day shifts.

5/6 - 5/13: Monday morning actual boring procedure begins to install 24" carrier pipe beneath Matadero Creek. This is expected to be completed by weeks end if no unexpected delays are encountered. Shift will be 9AM - 4:30PM as permits allow to minimize noise disruption at night. During the time boring operations continue, crews will continue installing 24" open lay pipe adjacent to the creek unless boring operation prohibits this due to space restrictions.

5/13: Deep well Anode installation will be completed in the South bore pit immediately following the bore.

5/6 - 6/3 Night Work: the 8" tap line work north west of Page Mill and JSB will take place at night. Night shift will be 9PM - 5AM as permits allow to alleviate traffic tie ups during the day. This work will affect all lanes of JSB on the N/side of Page Mill and the #2 W/bound lane of Page Mill.

5/8: Proposed Nitrogen Test to be placed on new installed 2" Stanford Avenue tap line and 4" tap line north of Santa Maria on the same day. These are 1 hour tests. Stanford Ave closure is being requested for this work to be accomplished. The tap north of Santa Maria will include JSB lane shifts but should not require lane closures to complete.

5/13 - 5/17: Hydro test new 24" open lay and bore piping at Matadero Creek. This includes the 116' section installed last year but not tested.

5/27 - 5/29: Clearance and Tie-In of all new main line and taps. Work will be coordinated over a 3 day period. Upon clearing, the main line will be tied together at N/side of Matadero Creek and Page Mill tap on 5/27. This will allow ARB to caliper the entire section of ARB's installation and 6000' installed by USP, from S/side of creek to north of Santa Maria on 5/28. On 5/29 final tie in of the 3 taps and main line at the S/side of the creek and north of Santa Maria will be completed. This work will include use of CNG to keep associated taps serving customers during the extended clearance.

6/3 - 6/27: Cleaning and retirement of the old L109 along JSB will begin immediately after tie ins on 5/30 and should be completed by 6/12. This includes retirement of all associated Taps.

6/28 - 7/9: Excavation, Cleaning and Retirement of the old L109 along Sand Hill Road.

7/12/13: Clean up and all restoration work scheduled to be completed

Final Micro Seal along JSB should occur before July 31, 2013.

 

Stanford Gas Pipeline Work Udate from PG&E, January 31, 2013

  • Work continues along JSB near Santa Maria Ave with main line asphalt grinding, trenching and pipe installation. Grinding is performed so trench plates will be recessed, making a smoother transition for traffic. This work should wrap up next week and we’ll be transferring to hydro-testing the new section on February 4th.
  • Approximately 500' of 2" Tap running down Stanford Ave from JSB is tentatively scheduled to begin by February 4th. Approximately 600' of parking along the north side of Stanford Avenue will be taken out of use for this work. Signs will be posted ahead of time to prepare the public.
  • Approximately 500' of 8" Tap to the west of JSB and Page Mill is tentatively scheduled to begin by February 4th. Both these Taps are expected to take 7-10 days to construct.
  • On Tuesday January 29th, PG&E’s contractor, USP, dug into a secondary electric service on Junipero Serra Boulevard. A fuse was opened at 2:52 pm in order to make repairs. Power to 19 residential customers in the area was disrupted and it was restored at 2:31 am on Wednesday. Investigation is still underway on the root cause of the dig in.

Stanford gas pipeline work update from PG&E, January 24, 2013

  • Work continues along JSB from Stanford Ave to Santa Maria Ave with main line asphalt grinding, trenching and pipe installation. Grinding is performed so trench plates will be recessed, making a smoother transition for traffic.
  • Underground electric distribution line is being repaired N/of Stanford Ave, and should conclude today.
  • JSB paving will begin today weather dependent at Campus Drive West
  • USP will continue trenching and installing main line pipe along JSB from Stanford Ave. to just N/of Santa Maria Ave. until completed. Completion of this main line is expected to take place between February 1st - 8th.
  • Approximately 500' of 2" Tap running down Stanford Ave from JSB is tentatively scheduled to begin between January 24th - 28th, while main line construction continues. Approximately 600' of parking along the N/side of Stanford will be taken out of use for this work. Signs will be posted ahead of time to prepare the public.
  • Approximately 500' of 8" Tap on the west side of Page Mill and JSB is tentatively scheduled to begin the same time, January 24th - 28th. Both these Taps are expected to take 7-10 days to construct.

Stanford gas pipeline work update from PG&E, January 17, 2013

USP, PG&E’s contractor for the work, will continue trenching and installing main line pipe along JSB from Stanford Avenue to just north of Santa Maria Avenue. Completion of this main line is expected to take place between February 1st - 8th.

Installation of approximately 500' of a 2" tapline running down Stanford Ave from JSB to a regulator station is tentatively scheduled to begin between January 24th - 28th, while main line construction continues. Approximately 600' of parking along the north side of Stanford Avenue will be taken out of use for this work, which is expected to take 7 to 10 days to complete. Signs will be posted ahead of time to prepare the public.

Tie ins and testing of the line is still expected to be complete by the end of March.

Stanford gas pipeline work update, December 7, 2012:

PG&E is currently on schedule to either strength test or replace Line 109 along Miranda, Foothill, and Junipero Serra Boulevard to meet the CPUC deadline of December 17th. We have made significant progress in replacing many sections of pipeline and will complete a strength test to verify the safety and strength of those sections of pipeline still scheduled for replacement. Although we were unable to replace the entire pipeline in 2012 due to unforeseen scheduling delays, we expect to complete the full project and restore the area by March 31st. We apologize for any inconvenience as a result of the revised schedule.

We are scheduled to finish replacement of the portion of Line 109 at Page Mill Road and Junipero Serra Boulevard by December 10. Once complete, we will hydro test this section of pipe, which involves filling it with water under pressure to ensure the strength and safety of the line. We will be working extended hours to complete this effort, and will make every effort to keep disruption to a minimum.

We have begun repaving sections of Junipero Serra Boulevard, which will continue into January, with a break for the holidays.

In January we will resume daytime work replacing the pipeline from Santa Maria Avenue to Page Mill Road. As with the sections of pipeline replaced so far, the replacement pipeline will be installed using industry best practices using modern pipeline materials. Once complete, the entire stretch of Junipero Serra Boulevard will be permanently repaved.

 

Some links to PG&E's website with information on pipeline safety:

Additionally, PG&E has provided some fact sheets relating to gas pipelines:

News from the Stanford Report:

Other News:

NTSB Investigation into the San Bruno Explosion:

California Public Utilities Commission:

Stanford Staff will continue to follow this issue and provide information as it becomes available.