Weak-Base Anion Exchange (WBA) Pilot Testing - Well #15


SCH Number
Lead Agency
Santa Ynez River Water Conservation District
Document Title
Weak-Base Anion Exchange (WBA) Pilot Testing - Well #15
Document Type
NOE - Notice of Exemption

Document Description
Project includes a pilot study designed to test the feasibility of using weak-base (WBA) anionic resins in the anion exchange treatment of groundwater to remove hexavalent chromium. Specifically, pumping equipment in a District water supply well (Well #15) will be modified to produce a flow rate of less than 5 gpm to accommodate a pilot testing system composed of skid-mounted filtration and 3-column anion exchange unit. Water will be pumped and treated using three commercially available resins. Regular sampling of the raw and treated water for laboratory analysis will occur, along with periodic data gathering of field measurements, for an initial trial period of approximately 3 months. The study may be extended if test results indicate further data gathering is warranted. This pilot treatment testing is part of a larger project to manage the loss of production capacity resulting from the recently established water quality threshold for hexavalent chromium drinking water. Upon completion of the pilot study, mechanical and chemical treatment/development of the well will be conducted prior to re-installation of full capacity (1,200 gpm) pumping equipment.

Contact Information
Chris Dahlstrom
Santa Ynez River Water Conservation District
P.O. Box 157
Santa Ynez, CA 93460

Phone : (805) 688-6015


Santa Barbara

Notice of Exemption

Exempt Status
Declared Emergency
Type, Section or Code
Reasons for Exemption
Class 6 Data Collection. Resent declaration of a drought emergency by the Governor of CA, the Santa Barbara County Board of Supervisors, and the District, results in the proposed project, as it relates to water supply, as part of a larger action to mitigate said drought emergency. Specific actions necessary to prevent or mitigate an emergency are exempt.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.

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