Last site update: November 22, 2011
Low Intensity Chemical Dosing webpage went live November 22, 2011.
Please check back often as we will be updating this site to give you the most up-to-date Low Intensity Chemical Dosing Study information.
The Low Intensity Chemical Dosing (LICD) study is a demonstration project to evaluate the treatment of agricultural drainage water using coagulants to remove dissolved organic carbon (DOC). DOC in water exported from the Delta can form cancer causing disinfection byproduct precursors when disinfected for drinking water purposes. The study is also evaluating the acceleration of wetland peat accretion as a result of the LICD process and the potential benefit to levee stability and the reduction of subsidence.
This Proposition 13, Chapter 9, Article 3, Bay-Delta Multipurpose Program funded project is being administered by the Bay-Delta Office and conducted by the United States Geological Survey (USGS). The USGS, with subcontracted support by the University of California at Davis (UCD), has completed the initial planning and laboratory testing phases of the project and constructed nine earthen wetland test cells on Twitchell Island. The test cells are being outfitted with piping and equipment to deliver agricultural drain water into the cells, piping to inject chemical coagulants into the drain water, monitoring stations to acquire water samples, and monitoring stations to allow measurement of accretion of organic matter. The test cells were flooded with drain water in mid-July 2011 to begin prove-out testing of the supply system and assess general drainage patterns within the cells. Completion of chemical coagulant piping installation as well as other components and chemical feed testing is scheduled for Fall 2011. System testing and validation of monitoring and measurement methods is planned for the Fall 2011 through Spring 2012. Long-term testing of the system is planned for Spring 2012 through Summer 2013.
Low Intensity Chemical Dosing Study Documents
Study documents, including a summary of the project basis, the objectives, and the approach, are provided at the USGS California Water Science Center project webpage:
Frequently Asked Questions
Requests for information and questions concerning the Low Intensity Chemical Dosing Study may be directed to:
South Delta Management Section
California Department of Water Resources
P.O. Box 942836
Sacramento, CA 95814
Telephone: (916) 653-2118
FAX: (916) 653-6077