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ITEM  46 City Council Memorandum      Public Works & Utilities  Memo No. UA25-010         Date: October 14, 2024 To: Mayor and Council Thru: Joshua H. Wright, City Manager Andy Bass, Deputy City Manager John Knudson, Public Works and Utilities Director From: Danny Sargent, Water Systems Senior Manager Subject: Purchase of Granular Activated Carbon

Proposed Motion:

Move City Council approve the purchase of granular activated carbon, from Calgon Carbon Corporation, utilizing City of Phoenix Contract No. 133070, in an amount not to exceed $1,059,468.

Background/Discussion:

The Pecos Surface Water Treatment Plant (PSWTP), located at 1475 East Pecos Road, was commissioned into service in 1989. The PSWTP is rated to treat and deliver up to 60 million gallons per day of high-quality drinking water to Chandler residents, businesses, and industrial customers. To accomplish this task, the facility has 12 finished water filters that use a granular media as a final filtration process prior to delivery to Chandler water customers. Over the past two years, eight filters at PSWTP’s were retrofitted with granular activated carbon (GAC) media. After the installation of GAC, an assessment was performed on the performance of GAC.  The results of the study showed that GAC increases the organic removal performance of the filters and improves finished water quality. Organic material in the raw water delivered to the PSWTP via the Salt River Project's Consolidated Canal has been elevated over the last few years and is not expected to drop within the foreseeable future. GAC media has been identified as a means of reducing organic material in the PSWTP finished water, which then decreases the disinfection byproducts produced downstream of the filters.  Disinfection byproducts are regulated by the U.S. Environmental Protection Agency. This purchase will provide for installation of GAC filter media.  PSWTP has a total of 12 filters. The replacement of filters 1-4 was approved by City Council on July 11, 2022.  Filters 5-8 were approved by City Council on October 16, 2023.  Accordingly, there will be a future request for approval of the final installation of filter media in filters 9-12 with the needed support equipment in the next few months.

Evaluation:

The City of Phoenix competitively solicited and awarded a contract for supply, placement, removal, and thermal reactivation of GAC to Calgon Carbon Corporation. The city has a current agreement with the City of Phoenix allowing for the cooperative usage of its contracts. The City of Phoenix contract is valid through January 17, 2027.

Fiscal Impact

Account No. Fund Name Program Name Dollar Amount CIP Funded Y/N 605.3830.5419.0.0 Water Operating Other Equipment R&M $1,059,468 N

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