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STRATEGIC OUTCOMES |
ACTION |
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Department: |
☒ Safe & Prosperous |
☒ Motion |
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Finance |
☐ Active & Appealing |
☐ Resolution |
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☐ Respected & Responsible |
☐ Ordinance - Introduction |
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Division: |
☐ Connected & Engaged |
☐ Ordinance - Adoption |
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Procurement |
☐ Unique & Creative |
☐ Public Hearing |
TITLE:
title
Contract Award: Professional Engineering Services - Hydrogen Sulfide Mitigation Study
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SUMMARY RECOMMENDATION:
Summary Recommendation
Authorize a professional engineering services contract for the Hydrogen Sulfide Mitigation Study Grant project, utilizing the Water Systems On-Call Services contract in the amount of $209,670.00 to Carollo Engineers, Inc. (Utilities RFQ-23-087) (Jeremy McCall/Robin Wilson)
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STRATEGIC OUTCOME:
This item supports the City Council’s strategic outcome of Safe and Prosperous. The project involves studying treatment methods to create a long-term plan for reducing sulfide buildup in publicly owned treatment Works. Doing so will help the utility prevent serious corrosion of infrastructure, eliminate hazardous wastewater odors, and lower the risk of dangerous accumulation. These efforts will make assets last longer, improve safety for workers, and improve community satisfaction by minimizing odor and corrosion problems.
REPORT:
The City received a 604(b) Water Quality Management Planning Grant to develop a management plan to reduce sulfide generation in its wastewater collection system.
This project utilizes flow meters and Hydrogen Sulfide monitors to determine baseline hydrogen sulfide levels. Then Bioxide dosing will be introduced into the wastewater stream to oxidize sulfides to sulfate. Optimal amounts of Bioxide needed to reach target sulfide levels of 0, 10, and 20 ppm will be developed by monitoring the amount of sulfide remaining in the liquid phase and the amount of hydrogen sulfide gas remaining in the annular phase (headspace in the pipe).
The results of the study will assist the City in developing a long-term Hydrogen Sulfide management plan strategy. Subsequently, this will help with improved longevity of the City’s collection systems and support a cleaner environment, improved public health, and a more dependable wastewater system for residents.
Engineering services are projected to start by mid-May 2026 with completion by August 2026.
FISCAL REQUIREMENTS:
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CITY FUNDS: |
$ 0.00 |
BUDGETED: |
$ 211,000.00 |
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STATE FUNDS: |
$ 0.00 |
AVAILABLE TO TRANSFER: |
$ 0.00 |
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FEDERAL FUNDS: |
$ 209,670.00 |
IN CONTINGENCY: |
$ 0.00 |
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OTHER SOURCES: |
$ 0.00 |
FUNDING ACCOUNT/FUND #/CIP: |
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TOTAL |
$ 209,670.00 |
ADEQ Grant 604B |
FISCAL IMPACT STATEMENT:
Sufficient budget capacity is provided in the FY 2026 City Council approved budget to award this contract. The project is federally funded by the 604(b) Water Quality Management Planning Grant ID: C6-96973525.
ADDITIONAL INFORMATION:
SUPPORTING DOCUMENTS NOT ATTACHED TO THE CITY COUNCIL ACTION FORM THAT ARE ON FILE IN THE OFFICE OF THE CITY CLERK:
NONE
IF CITY COUNCIL ACTION INCLUDES A CONTRACT, LEASE OR AGREEMENT, WHO WILL BE RESPONSIBLE FOR ROUTING THE DOCUMENT FOR SIGNATURE AFTER CITY COUNCIL APPROVAL?
☐ Department
☐ City Clerk’s Office
☐ Document to be recorded
☐ Document to be codified
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Acting City Administrator: |
Date: |
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John D. Simonton |
04/27/2027 |
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Reviewed by City Attorney: |
Date: |
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Richard W. Files |
04/27/2027 |