The following report on the Temporary Barriers Project is for your information and action, as appropriate. This report will be transmitted whenever changes occur to the operation of the barriers, and as a result of modeling and/or field monitoring of water levels in the south Delta.
STATUS AS OF: May 27, 2016
Agricultural Barriers (Middle River [MR], Old River near Tracy [ORT], Grant Line Canal [GLC]):
The installation of the Middle River barrier started on March 2, 2016; closure was achieved by March 9, 2016. All flap gates are tidally operating as of April 1, 2016.
The installation of the Old River near Tracy barrier started on March 3, 2016; the construction crew closed the barrier on March 25, 2016. The flap gates were released to tidal operation on April 1, 2016.
The construction crew started working on the Grant Line Canal barrier on Monday March 28, 2016; the in-water work started on March 30, 2016 with partial closure attained by April 14, 2016. Mobilization to close the barrier started on May 25, 2016, the work started yesterday May 26, 2016 and it is anticipated that the completion of the barrier will be achieved by June 09, 2016.
Head of Old River Barrier [HORB]:
The construction on the Spring Head of Old River barrier started on March 10, 2016 with closure achieved by April 1, 2016. All slide gates are placed in the open position in accordance with the Biological Opinions. Mobilization for the removal of the barrier is scheduled to begin on Thursday May 31, 2016; it is anticipated that the spring head of Old river barrier will be completed removed by June 17, 2016.
Environmental Permits Compliance Reporting:
Environmental staff conducted pre-construction surveys as required by the State and Federal permits and by Biological Opinions. Water quality monitoring and sampling for settleable solids and turbidity were conducted during the installation of the barriers and will continue during the installation of the middle portion of the Grant Line Canal barrier and during the removal of the spring head of Old River barrier.
Water Levels and Water Quality Notifications:
No exceedance were observed of the water quality turbidity measurements during the installation of the MR, ORT, GLC partial closure, and the HORB. DWR will continue to monitor the water quality parameters and the water levels during the installation, removal, and operation of the barriers.
No water level concerns received as of today from South Delta Water Agency.
Many thanks to Reza of the Delta Compliance and Modeling Section, computer modeling was performed. A copy of the modeling results is attached for the modeling period from 05-24-16 through 06-13-16. The water level in Middle River was above the concern level of 2.5 feet National American Vertical Datum (NAVD) for the modeling duration. The water level at the Old River near Tracy site was above the concern level of 2.5 feet NAVD in the beginning of simulation period then at the concern level of 2.5 feet NAVD beginning on 05-27-16 and ending on 05-29-16 then it moves above the concern level for the rest of the simulation period. The water level at the Grant Line Canal site dipped slightly below the concern level of 2.5 feet NAVD to a value of 2.4 feet NAVD for the period from 05-26-16 through 05-30-16 then it touches the 2.5 feet NAVD line on 05-31-16 and after that it moves above the 2.5 feet NAVD concern level for the rest of the modeling period.
Real-time south Delta water level data is available on CDEC at the URL below:
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Mike Abiouli, Water Resources Engineer
Jacob McQuirk, P.E.
Temporary Barriers and Lower San Joaquin
1416 9th St., Room 215-23
Sacramento, CA 95814
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