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 13, 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; with closure 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. Full closure of the barrier is anticipated in late May or in early June when the Delta smelt clears the area.
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. Removal of the barrier is scheduled to begin in June 1, 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 for the reminder of in-water work.
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 operation of the barriers.
No water level concerns received from South Delta Water Agency.
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 05-10-16 through 05-30-16. 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 slightly 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 starting at 5-23-16 through 5-30-16. 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 to 2.2 feet NAVD for the period 5-24-16 through 5-30-16.
Real-time south Delta water level data is available on CDEC at the URL below:
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Jacob McQuirk, P.E.
Temporary Barriers and Lower San Joaquin
1416 9th St., Room 215-23
Sacramento, CA 95814
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