Project Background

In 2020, ammonia and hydrogen sulfide was detected in raw groundwater at Beltz 12. This led to a decrease in production, then to well shutoff due to limited capacity within the existing treatment equipment. The Beltz 12 Ammonia Improvements Removal Project will add three major upgrades to the existing treatment process: oxidation of hydrogen sulfide, additional chlorine for ammonia removal, and sufficient contact time to reach breakpoint chlorination to ensure free chlorine residual in finished water. 

The first phase of construction will install a new contact tank and associated piping. The second phase of the project will evaluate the need for any additional modifications to ensure water quality and water supply reliability objectives are met.

Phase 1 construction activities are complete.

Project Objectives

• Remove naturally-occurring ammonia and hydrogen sulfide
• Sustain production capacity
• Maintain reliable supply during droughts

Phase I Project Components

• Install new steel pressure vessel on a new concrete pad
• Install new piping to connect new pressure vessel to existing facility piping
• Relocate chlorine injection location on existing facility piping

 Phase I Project Schedule

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Phase II Project Components

• Install new chlorine generation system inside control building

Phase II Project Schedule

Phase II Construction Impacts

Work to be performed within an active water treatment facility site. Working hours are 8AM to 5PM, M-F.

Project Contact

Emmanuel Fonseca, P.E.

Associate Professional Engineer

efonseca@santacruzca.gov 

(831) 420-5518