Project Description

The San Diego County Water Authority’s pipeline relining project rehabilitates and extends the life of its aging water delivery pipelines. The relining process involves inserting steel lining into the existing pipeline to reinforce it to help prevent water leaks and breaks. This helps ensure a safe and reliable water supply for our region’s future.

The relining is done in segments based on the age of the pipelines and the need for improvements. The Mission Trails to Lake Murray Relining Project involves rehabilitating a portion of Pipeline 3 beginning immediately south of State Route 52 in Mission Trails Regional Park east of the community of Tierrasanta and continues south to Lake Murray in the community of San Carlos covering approximately three miles.

The construction crews will conduct most of the work underground, inside the pipe, by establishing and entering the pipeline in 11 various sites or portals. Large wooden structures known as sound walls are temporarily placed at each of the portals to adhere to environmental regulations and ease noise impacts to residents.

Fact Sheet

Current Project Schedule

Environmental documents released for public review/comment: May 2007

Environmental documents and project considered for approval: September 2007

Construction: July 2008 to December 2009

Community Outreach Activities

Community Presentations:

The Water Authority is committed to keeping all community groups and organizations in the project area informed about the project. Water Authority staff has made and will continue to make periodic project update presentations to the following organizations and groups:

• San Carlos Area Council
• Tierrasanta Community Council
• Mission Trails Regional Park Citizens Advisory Committee
• Mission Trails Regional Park Task Force
• Navajo Community Planners, Inc.
• Belsera Homeowners Association
• Woodland Hills Condominium Association
• San Diego Mountain Biking Association

If your group or organization would like a project update presentation, please contact us at (877) 682-9283, Ext. 7004 or e-mail us at CIPinfo@sdcwa.org. Please include your organization’s name and contact information as well as date/time of presentation requested.

Community Notices:

• Introduction postcard, March 2007
• Construction beginning notice, July 2008

Location of Construction Portals (Access Points)

Pipeline relining is conducted in several phases; using portals developed by removing 40-feet of existing pipe to gain access to the interior of the pipeline and to install relining materials. These 11 construction portals remain exposed but are gated and secured during construction. Not all portals are active at the same time, however. Work shifts from one portal to another depending on which phase is under way. The contractors usually work in a north to south pattern.

Portals 1 & 2	Inside Mission Trails Regional Park, south of state Route 52, east of Belsera condominiums in Tierrasanta
Portals 3 - 5	Inside Mission Trails Regional Park
Portal 6	Inside Mission Trails Regional Park, north of Mission Gorge Road and Jackson Drive
Portal 7	In the canyon just south of Hemingway Drive cul-de-sac
Portal 8	In the canyon just north of Hemingway Avenue cul-de-sac
Portal 9	In the canyon Northeast of Birchcreek Road
Portal 10	Behind Ace Hardware in the Keil’s shopping center
Portal 11	Mission Trails Golf Course, northwest of Lake Murray

Portal location map

Relining Photos

	The Mission Trails to Lake Murray Pipeline 3 Relining Project became a priority after a pipeline break in Mission Trails Regional Park in May 2006.
	Crews must remove a 40-foot section of pipeline to access the interior of the pipeline.
	Twenty-foot sections of steel liners are delivered to the portal locations for insertion into the aging pipeline.
	Crews lower the liner into the portal. Once in place a special cart carries the liner into the pipeline for placement.
	Sound walls surround each portal for safety and to reduce noise heard by neighbors. All construction activity occurs within the portal sound walls.
	Once the liner is in place crews fill the space between the old, aging pipeline and the new liner with a protective grout.
	After the entire section of pipeline is relined the 40-foot section of pipeline that was removed to install the liners is replaced with a relined section of pipeline. Crews then cover the pipeline, refill the portal hole and remove the sound walls, restoring the area to pre-construction conditions.
	Public tours will be offered during construction. If you are interested in attending a tour, please e-mail jshira@contractors.sdcwa.org.

Contact Us
For more information, please call the 24-hour toll-free project information line at (877) 682-9283, ext. 7005 or email CIPinfo@sdcwa.org. A representative from the project team will return your call within one business day.