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: July 8, 2011
Head of Old River (HOR) Barrier:
The planned spring Head of Old River non-physical barrier was not installed this season due to high flows in the San Joaquin River as a result of late season storm activity and associated heavy snow pack. High velocity flows posed excessively dangerous conditions for divers which ruled out the possibility of installing the necessary equipment on the channel bottom. As a result, fish studies at the HOR have been re-structured to evaluate predatory fish behavior in the absence of a non-physical barrier. In support of this analysis, the Fisheries Foundation captured and tagged predators in the HOR vicinity. The movement of VAMP and 6-yr study releases of tagged salmon smolts and steelhead were tracked in 2 dimensions to evaluate behavior in absence of the NPB. The final fish release for this study was completed on June 18, 2011. All equipment were removed on June 23, 2011.
Agricultural Barriers (Old River near Tracy [ORT], Middle River [MR], Grant Line Canal [GLC]):
Installation of the Old River at Tracy (ORT) barrier started on May 27, 2011 and closure was achieved on June 10, 2011. Site cleanup was completed on June 15th.
Middle River (MR) barrier construction started on June 1, 2011 and was closed Monday June 6, 2011. All culvert flap gates at both barriers are tied open. Installation of the ORT and MR barriers will accommodate on-going fish monitoring studies and support water levels for south Delta diverters. The fish monitoring studies are required by the 2008 National Marine Fisheries Service (NMFS) biological opinion to: 1) examine the movements and survival of listed fish through the channels of the South Delta and ; 2) examine predation effects associated with the TBP.
Installation of the Grantline Canal (GLC) barrier started on Friday June 10, 2011 and included re-construction of the south abutment and culvert structures which were removed at the end of the 2010 season. The Grantline Canal culverts had reached the end of their service life and required replacement to provide on-going barrier effectiveness. Construction completed laying the gravel pad for the new culvert structures and all six culverts were in-place on June 24, 2011. Minor settlement of the culvert structures required removal and re-installation of the culverts which was completed on June 29, 2011. Rock backfill which covers the culvert structures was completed on June 30, 2011. Closure of the Grantline Canal barrier is anticipated on July 13.
Water Levels/Water Quality Problem Notifications:
In compliance with the 401 Certification, staff performs daily surface water sampling at the Grantline Canal site during construction. No violation of the conditions is reported.
Modeling results are attached and water levels are a minimum of +0.8 ft above target levels at all 3 sites. Minimum water levels for the forecast period occur on July 12, 2011 and are as follows: +0.8 feet above the target level of 0.3 ft in Middle River at Howard Road (Station MHR); +0.9 feet above the target level of 0.0 ft in Old River at Tracy Blvd (Station OLD), and; +0.8 feet above the target level of 0.0 ft in Grantline Canal at Doughty Cut (Station DGL). On July 13, 2011 water levels in Old River and Grantline Canal will increase significantly due to the closing of the Grantline Canal barrier. The modeling run assume that culvert flap-gates remain tied open at all 3 sites.
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Jacob McQuirk, P.E.
Chief, Temporary Barriers Project and Lower San Joaquin
California Department of Water Resources
1416 9th St., P.O. Box 942836
Sacramento, CA 94236-0001
Phone: (916) 653-9883 FAX: (916) 653-6077
Cell: (916) 425-6857 E-Mail: email@example.com