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: March 28, 2014
Head of Old River (HOR) Barrier:
Spring Head of Old River barrier construction began on Tuesday March 25, 2014, three days after the projected starting date of March 22, 2014. Currently, the construction is focused on preparing the pad for the culverts at the same time building up the barrier by dumping rock. A barge and a long-reach excavator are being used to accomplish the task. It is anticipated that the HOR barrier will be closed by Tuesday April 8, 2014.
Agricultural Barriers (Middle River [MR], Old River near Tracy [ORT], Grant Line Canal [GLC]):
Temporary agricultural barrier installation of the Middle River started on March 11, 2014, and it was finished on March 17, 2014. The flap gates are tied open as required by the regulatory permit. The installation of the Old River near Tracy barrier started on March 11, 2014. The construction crew finished the installation of the culverts then shifted resources to the Grant Line Canal barrier. The contractor is planning to resume work on the ORT barrier this coming Saturday March 29, 2014 to install the boat ramps and the mats. It is anticipated that the barrier will be closed by Friday April 4, 2014. Work on the Grant Line Canal barrier continues with the placement riprap and the grading of the north abutment of the barrier. The partial closure of the Grant Line Canal will be achieved by the end of today Friday March 28, 2014.
Environmental Permits Compliance Reporting:
Environmental compliance monitoring continues as scheduled. Monitors are keeping a close eye on the Swainson’s hawk that is building a nest and on the Red Tail hawk already nesting.
Sound monitoring will resume after a short pause; it will be scheduled for two additional days. Water quality sampling and monitoring are being conducted at all construction location during the in-water work.
Water Quality Monitoring:
In compliance with our 401 permit, water sampling is being collected at each construction sites. Turbidity and settable solids data is being collected and will be submitted to the Central Valley Regional Water Quality Control Board next week. All recoded levels have been below the threshold.
Water Levels and Water Quality Notifications:
Closure of Middle River was achieved, Grant Line Canal is partially closed, and DWR will continue to monitor the water levels.
Modeling will be conducted one week from today; modeling results will be posted as soon as they become available.
Real-time south Delta water level data is available on CDEC at the URL below:
These weekly updates are also available for your information on our website:
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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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