Operation of Replacement Well 9B & Sodium Bisulfite Storage and Feed System


SCH Number
Public Agency
State Water Resources Control Board
Document Title
Operation of Replacement Well 9B & Sodium Bisulfite Storage and Feed System
Document Type
NOE - Notice of Exemption
Document Description
The SWRCB - as the lead agency - has issued a water supply permit amendment. In October 2016, Mesa Water District drilled a 1,895-gallon per minute well to replace a 1,850-gallon per minute well that failed during a well rehabilitation at the same site. Mesa water also installed a new pump for the well and cut and capped an existing storm drain lateral. In February 2017 Mesa Water also completed construction on modifications to their Mesa Water Reliability Facility. Mesa water installed sodium bisulfite storage and feed system, including a 2000 gallon storage tank, scrubber tank, vent lines, containment stile, valves, and instruments. The purpose of the SBS system is to remove odor-causing compounds in the source water that are not removed in the MWRF Degasifiers. A Degasifier Clean in place system was installed to remove biofouling. Modification were also made to the existing carbon dioxide feed system that converts the bisulfides in the source water to hydrogen sulfide, and improvements were made to the chlorination controls. This addition will provide improved control of the plant's chloramine residual. The project will improve the aesthetic quality and disinfection control of the MWRF finished water and provide for more efficient operation of facilities.

Contact Information

Oliver Pacifico
Agency Name
State Water Resources Control Board
Contact Types
Lead/Public Agency


Costa Mesa
Cross Streets
Susan Street and Sunflower Avenue; Gisler Avenue and College Avenue

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
S:15301 C:1
Reasons for Exemption
The replacement of the well in this project consists of existing utility systems involving no expansion of capacity. The project also consists of the operation of existing publicly owned utility structures involving no expansion of use beyond that existing at the time of the lead agency's determination.

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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