City Council Meeting - FINAL

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Meeting Date: 10/06/2020  
Co-Submitter: Mark Richardson From: Brian Huntzinger, Water Production Manager

Consideration and Approval of Contract:  Proprietary source purchase of T-Floc B41 Chemical for Water Treatment from Thatcher Company of Arizona in an amount not to exceed $200,000 annually.
Approve the proprietary source purchase of T-Floc B-41 Chemical for Water Treatment from Thatcher Company of Arizona, Inc. at a unit price of $0.398 per pound, in an amount not to exceed $200,000 (two hundred thousand dollars) annually.
Executive Summary:
Chemicals represent a large investment in the effective operation of the city's potable water treatment plants.  Chemical coagulants are used to remove impurities in surface water from Upper Lake Mary in the production of potable drinking water.  These chemicals are critical to the treatment of water in order to comply with water quality regulations and ensure the public's safety.  In 2016 the Lake Mary Water Treatment Plant conducted trials with various coagulants to determine the best treatment.  Based on the study, T-Floc B41 was selected and has been in use at the Lake Mary Water Treatment Plants since the end of 2016.
Financial Impact:
This chemical purchase is budgeted annually in the Water Services Fund in account 202-08-301-1011-0-4362, with a total FY 2020-21 budget of $308,200 for all water treatment chemicals.  
Policy Impact:
Connection to PBB Key Community Priorities/Objectives & Regional Plan:
Priority Based Budget Key Community Priorities and Objectives
  • Safe & Healthy Community:  Foster a safe, secure, and healthy community.
  • Sustainable, Innovative Infrastructure: Deliver outstanding services to residents through a healthy , well maintained infrastructure system.
Regional Plan
  • Goal WR.1:  Maintain a sustainable water budget incorporating regional hydrology, ecosystem needs, and social and economic well-being.
  • Goal WR.2:  Manage a coordinated system of water, wastewater, and reclaimed water utility service facilities and resources at the City level and identify funding to pay for new resources. 
    • Policy WR2.1:  Develop and adopt an integrated water master plan that addresses water resources, water production and its distribution, wastewater collection and its treatment, and reclaimed water treatment and its distribution.
    • Policy WR2.2:  Maintain and develop facilities to provide reliable, safe, and cost effective water, wastewater, and reclaimed water services.            
  • Goal WR.3:  Satisfy current and future human water demands and the needs of the natural environment through sustainable and renewable water resources and strategic conservation measure.
  • Goal WR.6:  Protect, preserve, and improve the quality of surface water, groundwater, and reclaimed water in the region.
Has There Been Previous Council Decision on This:
Yes, Council approved previous purchasing contracts of T-Floc B-41 with Thatcher Company of Arizona, Inc. on November 15, 2016, and September 18, 2018, meetings.  
Options and Alternatives:
1.  Approve of the proprietary source purchase of T-Floc B41 from Thatcher Company of Arizona, Inc.;
2.  Do not approve the proprietary source purchase, which would require the Lake Mary Water Treatment Plant to re-evaluate the treatment process and potentially convert back to one based on aluminum sulfate as a primary coagulant.
Chemicals represent a large investment in the effective operation of potable water treatment plants.  Flagstaff Water Services, Water Production Section uses the following chemicals for these specific purposes:
  • Chlorine dioxide is used for disinfection and oxidation of raw/untreated surface water; while minimized disinfection by-product formation.
  • Chlorine is used for disinfection of treated surface and ground water and maintaining residual disinfection levels in the distribution system.
  • Coagulants such as T-Floc B41 or aluminum sulfate and cationic polymer are used for removal of suspended impurities.
  • Sodium hydroxide or caustic soda is used to balance the pH of treated water.

The treatment chemical/coagulant T-Floc B-41 is used in place of aluminum sulfate which helps reduce the use of caustic soda and cationic polymer.  Over the last decade, compared to traditional coagulants such as aluminum sulfate, poly aluminum chlorohydrates, such as T-Floc B-41, have been found to work more effectively in low alkalinity waters such as is found in Upper Lake Mary and require less pH adjustment both for raw and treated/finished water. 
Proprietary Procurement Justification
B-41 Pricing
Thatcher Letter


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