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ITEM 31

City Council Memorandum Public Works & Utilities Memo No. UA21-054

Date:

June 21, 2021

To:

Mayor and Council

Thru:

Joshua H. Wright, Acting City Manager
Debra Stapleton, Assistant City Manager
John Knudson, Public Works and Utilities Director

From:

Josef Kennis, Wastewater Facilities Superintendent

Subject:

Agreement No. WW0-885-4137, Amendment No. 1, with In-Pipe Technology, LLC, and USP Technologies, for the Collection System Odor and Corrosion Control

Proposed Motion:

Move City Council approve Agreement No. WW0-885-4137, Amendment No. 1, with In-Pipe Technology, LLC, and USP Technologies, for the collection system odor and corrosion control, in a combined amount not to exceed $500,000, for a one-year period, July 1, 2021, through June 30, 2022.

Background/Discussion:

The Public Works & Utilities Department's sewage collection system consists of over 900 hundred miles of pipe and eight sewage lift stations located throughout the City. These structures work together to convey over 30 million gallons of sewage to the City's three treatment plants every day. The sewage collection system runs beneath most roads and streets throughout the City.

Wastewater in the collection system naturally produces noxious hydrogen sulfide gas causing odors and deterioration of pipes, manholes, and concrete structures. Reduction of hydrogen sulfide in the collection system can be accomplished by adding both chemical and microbial compounds at key locations that impede the formation of gas and help reduce the cost to rehabilitate affected structures. Lowering the concentration of hydrogen sulfide gas entering the Airport and Ocotillo water reclamation facilities will also help to drive down the cost of odor control at these facilities. This odorous gas is the main source of customer odor complaints associated with the City's sewer system and treatment facilities.

The project scope of work consists of monthly service of microbial dosing units including repair, parts replacement, and monitoring.

Over the past year, the chosen vendors have proven their efficiency and ability to reduce odor complaints and corrosion in the system while enhancing staff safety. These vendors have shown their ability to reduce the gas formation to acceptable levels while adapting to seasonal variations. Beyond the improved conditions, a cost savings has been seen in chemicals, operation, and maintenance.

Evaluation:

On July 16, 2020, City Council approved agreements with In-Pipe Technology, LLC, and USP Technologies, for the collection system odor and corrosion control, for a one-year term, with the option of up to two (2) one-year extensions. The contractors have agreed to extend the agreement for one (1) year at the same terms, conditions, and pricing.

Staff recommends extension of this agreement for the term of July 1, 2021, through June 30, 2022. This is the first extension of the original agreement.

Fiscal Impact

Account No.

Fund Name

Program Name

Dollar Amount

CIP Funded Y/N

611.3910.6817.6WW196

Wastewater Bond

Collection System Facility Improv.

$500,000

Attachments

Amendment - In-Pipe Technology

Amendment - USP Technologies