REPORT TO THE CITY COUNCIL
February 15, 2018
FROM: THOMAS C. ESQUEDA, Director
Department of Public Utilities
THROUGH: MICHAEL CARBAJAL, Planning Manager
Department of Public Utilities - Utilities Planning & Engineering
BY: PAUL MARAGONI, Professional Engineer
Department of Public Utilities - Utilities Planning & Engineering
SUBJECT
Title
Approve a consultant services contract in the amount of $156,998 with Carollo Engineers, Inc., to design the expansion of a carbon dioxide injection system at the Northeast Surface Water Treatment Facility (Council District 6)
Body
RECOMMENDATIONS
Staff recommends that Council approve a consulting services contract in the amount of $156,998 with Carollo Engineers, Inc., for the expansion of a carbon dioxide injection system at the Northeast Surface Water Treatment Facility (NESWTF), and authorize the Director of Public Utilities, or designee, to sign the contract on behalf of the City.
EXECUTIVE SUMMARY
The Department of Public Utilities (DPU) is seeking to approve a consultant services contract to Carollo Engineers, Inc., of Fresno, California, to expand a carbon dioxide (CO2) chemical feed system at the NESWTF. DPU staff has determined that CO2 has beneficial features and characteristics for alkalinity adjustment, pH adjustment, and calcium hydroxide addition for finished water. Staff have completed the consultant services selection process in accordance with City policies and selected Carollo Engineers, Inc., to provide design and services during construction for the CO2 expansion project.
BACKGROUND
The City is currently using CO2 injection for alkalinity adjustment, pH adjustment, and calcium addition at the NESWTF. DPU recently conducted water treatment trials to optimize water quality using varied methods. Since calendar year 2016, these methods have proved successful in achieving the desired outcomes but has resulted in increased CO2 demand exceeding the existing CO2 chemical feed system cap...
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