Chromium-6 Water Treatment Facilities Improvement Project
2 Documents in Project
Summary
SCH Number
2016121051
Lead Agency
City of Coachella
Document Title
Chromium-6 Water Treatment Facilities Improvement Project
Document Type
NOD - Notice of Determination
Received
Posted
1/31/2017
Present Land Use
Varies. Includes 4 well sites in single family residential designation; 1 well site & both treatment sites in industrial designation
Document Description
Coachella Water Authority proposes to undertake the Chromium-6 water Facilities Improvement Project in order to comply with recently passed state of CA regulations. CWA operates six groundwater wells for its raw water supply, all of which have chromium-6 concentrations above the newly established MCL.
With implementation of the project, five of the six wells will continue operating, and the sixth well will be taken offline. The five wells will be upgraded with chromium-6 removal treatment technology. Under the SBA treatment option, the SBA resin capacity for chrmium-6 will periodically diminish, and the resin will require regeneration. The proposed project also includes analysis of the construction of a new CWA resin regeneration facility located on Avenue 52 on CWA property (RRF), or at the current CSD WWTP (CRRF). The resin regeneration process involves ion exchange using sodium chloride (brine) to remove the chromium-6 from the resin beads. Resin regeneration results in a spent brine, which necessitates proper treatment and disposal.
Alternatively, if a stannous chloride treatment approach is deemed feasible, CWA would upgrade the five wells with that technology. The stannous chloride treatment process involves adding stannous chloride to the water, allowing reaction time, removing the tin and chromium particles that remain with a filter. Treatment equipment includes a chemical feed system, reaction tank, and filters. Periodically, particles will accumulate and increase pressure on the filters and would need to be replaced. The stannous chloride process does not require resin regeneration and thus there would be no resin regeneration facilities for this approach.
Contact Information
Name
Scott Rogers
Agency Name
Coachella Water Authority
Contact Types
Lead/Public Agency
Phone
Location
Cities
Coachella
Counties
Riverside
Zip
92236
Total Acres
10.5
State Highways
86
Waterways
Whitewater River
Notice of Determination
Approving Agency
Coachella Water Authority
Approving Agency Role
Lead Agency
Approved On
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
N/A
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
No
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.