Mission Trails Project

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Looking south, toward Cowles Mountain, from within Mission Trails Regional Park. One of the blue vent stacks, seen in the distance, has since been removed as part of the Mission Trails Project.

Hot Off the Press

Project delayed

Citing concerns over increasing water rates due to lowered short-term water demand forecasts, the Water Authority's Board of Directors voted at its March 2011 meeting to delay several projects, including construction of the new Flow Regulatory Structure II. Pages 174-176 of the linked board memo outline details of the decision. Due to this delay, FRS II construction phase of the project has been delayed to approximately mid-2014.

This delay comes on the heels of action taken by the Board at its January 2011 meeting to delay 11 other Capital Improvement Program projects. More information can be found on pages 44-48 of the linked board documents from that meeting, as well as the related press release regarding that action.
 

About This Project

The San Diego County Water Authority maintains critical water pipelines beneath portions of Mission Trails Regional Park in the city of San Diego. The Water Authority is upgrading its untreated water system in the northwest area of Mission Trails to deliver more water to treatment plants that serve the central and south sections of San Diego County. The project will help ensure water reliability in the region through the year 2030.

Major Elements:

  • Construction of a pipeline tunnel and associated pipeline interconnections (complete),
  • Demolition of all existing above-ground vent stacks in the park,
  • Construction of a stabilized river crossing at the San Diego River (complete), and
  • Construction of a new underground flow regulatory structure.
ABOUT THIS PROJECT - DETAILS
 

Pipeline and Tunnel
Two existing small pipelines will be replaced with one larger pipeline. Nearly one mile long, the new pipeline will be constructed in a tunnel and will be able to deliver larger quantities of untreated water. A majority of work on the tunnel and new pipeline will take place underground in Mission Trails Regional Park, just east of the community of Tierrasanta in the city of San Diego.

 

Flow Regulatory Structure II

FRS II Access Structure
Conceptual Photo of Flow Regulatory Structure II Access Building

A new underground flow regulatory structure, or covered reservoir, will be constructed to help regulate the water system’s flow of untreated water. It will be capable of holding up to 12 million gallons of untreated water. An above-ground access building will be built to house instrumentation and controls, provide ventilation and security, and allow access for maintenance and repairs. Construction of FRS II is scheduled to begin in mid-2014 and last approximately two years.

 

 

 

Improved Crossing of the San Diego River
A river crossing that allows Water Authority, park ranger, fire, police, and emergency vehicles access to Mission Trails Regional Park was improved as part of this project in September 2009. Concrete slabs with footings, as well as a bollard marking water depth, were added to facilitate crossing for small trucks during low and normal water flows. The new, improved crossing will allow rangers and authorized personnel better access to the park. Pictures of the improved river crossing are included in the Multimedia section, below.

 

Vent Demolition

FRS II Access Structure
Vent Removal - Elliot vents sit on a hillside in MTRP.

When the new flow regulator structure is constructed, the Water Authority will be able to remove the remaining blue vent stacks that are visible on hilltops in the park and replace them with smaller structures.

 

 

 

 

 

School Information

Street Smart School Poster
Street Smart School Poster

During construction of the pipeline and tunnel portion of the project, Tierrasanta area roads experienced an increase in the number of large construction trucks. The truck activity is expected to be similar when construction of the new flow regulatory structure begins in mid-2014.

 

Construction requires large trucks to travel near certain Tierrasanta schools to access the western part of the park. The major roads that will be used include Clairemont Mesa Boulevard, Santo Road, Via Valarta, Antigua Boulevard, and Portobelo Drive. Truck drivers will be required to follow appropriate traffic rules, as well as weight and speed limits.

 

Safety is the Water Authority’s first priority, and we want to help keep kids safe. During construction, please talk to your child about street safety. “Street Smart” posters providing street safety tips will be provided to schools near the access routes. Please look for these posters at your local Tierrasanta school.
 

  

Trail Closures in the Park
Since the Water Authority currently has no active construction projects in the park, trails are open. When construction of the new flow regulatory structure begins in mid-2014, trail safety will continue to be, as it was during the pipeline tunnel project, an important aspect of the project. Also important is maintaining recreational access to trails at the park during construction, whenever possible. To keep trail users safe, when construction resumes in mid-2014, certain trails in the western portion of the park will be closed. During construction hours, which will be Monday through Saturday, 7 a.m. to 7 p.m., closed trails will be off-limits to recreational access. However, trails will be able to be accessed outside of these construction hours and on Sundays.

Any closed trails will be reopened after construction completion. 

 
Helpful Links
Mission Trails Regional Park - http://mtrp.org/index.asp
City of San Diego Water Department - http://www.sandiego.gov/water/
Tierrasanta Community Council - http://www.tierrasantacc.org/
San Diego Mountain Biking Association - http://www.sdmba.com/

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SCHEDULE
 
FRS II construction begins Mid-2014
FRS II construction ends Mid-2016

*All dates are approximate and subject to change.

 

Completed Milestones

Trails Reopened October 2010
Project construction begins October 2008
Installation of field office trailers December 2008
Clairemont Mesa Blvd. Bridge Repair December 2008 - January 2009
Establish North Portal December 2008 - January 2009
Establish South Portal December 2008 - January 2009
Major Tunneling Activities February 2009 - mid 2010
Completion of project design July 2007
Final EIR and project approved by
Water Authority Board of Directors
August 24, 2006
45-day public review period closed May 10, 2006
Public hearing at the Water Authority April 27, 2006
Release of Draft Environmental Impact Report March 27, 2006

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MAP
 
CIP Example
Trail closure map for pipeline tunnel project. A new map will be created for the FRS II project in advance of construction.

(View Larger)

MULTIMEDIA
 
 

Photos

River Crossing Before
The river crossing site prior to installation.
 
River Crossing Construction
A bulldozer prepares the river bottom for the concrete pad.
 
River Crossing Form Work
Preparing the river crossing site for rebar installation.
 
Finished River Crossing Pad
The finished concrete pad for river crossing.
 
River Crossing with Water Flowing
The new river crossing, shown under water.
  
 

Videos

There are no videos for this project.

 

Other

There is no additional Multimedia for this project.

 

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PUBLICATIONS
 
COMMUNITY OUTREACH
 

 

 

Mission Trails Project Working Group
From May 2005 to March 2006, the Water Authority convened a public working group to gather community input about the project. Working group members included representatives from the Tierrasanta and San Carlos communities, Mission Trails Regional Park, and park user groups. The group met periodically throughout the design, environmental and planning stages, informing the Water Authority of their concerns and providing suggestions for addressing those concerns.

 
 

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ENVIRONMENTAL DOCUMENTS
 

Click here to view the Environmental Impact Report and other environmental documents for this project.

 

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CONTACT INFORMATION
 

For more information, please call the 24-hour toll-free project information line at (877) 682-9283, ext. 7004 or email CIPinfo@sdcwa.org. A representative from the project team will return your inquiry within one business day.

 

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