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ITEM 32

City Council Memorandum Public Works & Utilities Memo No. CP25-058

Date:

November 7, 2024

To:

Mayor and Council

Thru:

Joshua H. Wright, City Manager
Andy Bass, Deputy City Manager
John Knudson, Public Works and Utilities Director
Daniel Haskins, Capital Projects Division Manager

From:

Gina Ishida-Raybourn, Principal Engineer

Subject:

Construction Manager at Risk (CMAR) Construction Services Agreement No. WA2100.401, with Archer Western Construction, LLC, for the Water System Upgrades Program

Proposed Motion:

Move City Council award CMAR Construction Services Agreement No. WA2100.401, to Archer Western Construction, LLC, for the Water System Upgrades Program, in an amount not to exceed $2,094,455.

Background/Discussion:

The Pecos Surface Water Treatment Plant (PSWTP), located at 1475 East Pecos Road, was put into service in 1989. The current treatment capacity of the PSWTP is 60 million gallons per day (MGD). In recent years, the source water quality from the Salt River Project canal that feeds the PSWTP has been increasing in total organic carbon (TOC). TOC is a major contributing factor in the formation of Total Trihalomethanes (TTHM), which are regulated compounds that can occur in the city's water distribution system. The most effective method to mitigate TTHM formation in the water system is to reduce TOC levels in the treated water at the PSWTP. A common method to accomplish TOC reduction utilizes contact with granular activated carbon (GAC) filter media to reduce TOC in the water.

The PSWTP currently has four existing filters with anthracite media installed and eight filters which had GAC media installed in early 2022 and early 2024. This project will replace the remaining four filters with GAC media to directly reduce TOC levels in the treated water. Additionally, minor structural rehabilitation work will be performed to extend the remaining useful life of the four concrete filter basins.

The project scope of work consists of the replacement of existing anthracite media with GAC and sand media, procurement and installation of polymer pump and associated piping, and minor concrete rehabilitation. The agreement completion time is 235 calendar days following Notice to Proceed.

A related Professional Services Agreement with Hazen and Sawyer, for the Water System Upgrades Program, is also scheduled for this City Council meeting.

A related Pre-Construction Services Construction Manager at Risk Contract with Archer Western Construction, LLC, for the Water System Upgrades Program, is also scheduled for this City Council meeting.

Evaluation:

The selection process was followed in accordance with city policy and procedure and state law. Staff recommends agreement award to Archer Western Construction, LLC, based on qualifications, relevant firm experience, team experience, project understanding, and project approach. Staff reviewed the Guaranteed Maximum Price proposal and determined it to be reasonable.

Fiscal Impact

Account No.

Fund Name

Program Name

Dollar Amount

CIP Funded Y/N

601.3820.6718.6WA210

Water Bond

Water Treatment Plant Improvements

$2,094,455

Attachments

Location Map

Agreement - Archer Western