Tuesday, December 3, 2013

Helen Drive Work Update

Work will be concluding on schedule in mid-December for the seismic upgrade of the water pipeline located underground behind Meadows School in Millbrae. The project included excavation, welding and concrete placement for “sliplining”, placing a new steel pipe inside the existing pipe. The contractor is now preparing the pipeline to be put into service.

Sliplining old 60" pipe with new 48" pipe, using a crane and casters

Work hours: 7:00am - 7:00pm   Expected completion date: Dec. 15th, 2013
The Contractor has successfully completed leak testing the pipeline with the new 48” slipline. The grouting between the new liner and the existing pipe was completed the week of Thanksgiving.  
Neighbors may notice the discharge of large volumes of water down storm drains on Helen Drive. Unfortunately the water can’t be delivered to the public nor reused for other testing after it leaves the pipe, due to water quality regulations. This “dewatering” will be monitored so flooding will not occur.  In addition, construction traffic will continue on Helen Dr.  Pilot cars will escort trucks for safety and flaggers will be stationed on Helen Dr. as needed.
We appreciate your cooperation and support as we work to improve your regional drinking water system.  We invite you to call our 24-hour phone line at (866) 973-1476 or email us at peninsula@sfwater.org with questions or concerns.
Project Description
Our contractor, Kiewit Infrastructure West Co., is working in multiple areas within the Harry Tracy Plant, part of the Hetch Hetchy Water System Improvement Program. Seismic retrofits and electrical upgrades will allow us to reliably provide up to 140 million gallons of water per day, for 60 days, within 24 hours of a major earthquake.

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