Beltz 12 Ammonia Improvements Removal Project

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

Project Schedule

November 2022 - January 2023: Request for Bid
January 2023: Award of Contract to Don Chapin Company
June 2023 - February 2024: Construction Phase I
August 2024: Complete

Phase II

Project Components

Install new chlorine generation system inside control building

Project Schedule

March 2024 - May 2024: Request for Bid
May 2024: Award of Contract
November 2024 - June 2025: Construction - 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