Title
Local Limits Study for 91st Avenue and 23rd Avenue Wastewater Treatment Plants - Engineering Services - WS90120037 and WS90200044 (Ordinance S-53305) - Citywide
Description
Request to authorize the City Manager, or his designee, to enter into an agreement with Brown and Caldwell, Inc., to provide Engineering Services that include assessment, study, and project management services for the Local Limits Study for 91st Avenue and 23rd Avenue Wastewater Treatment Plants project. Further request to authorize execution of amendments to the agreement as necessary within the Council-approved expenditure authority as provided below, and for the City Controller to disburse all funds related to this item. The fee for services will not exceed $1,350,000.
Additionally, request to authorize the City Manager, or his designee, to take all action as may be necessary or appropriate and to execute all design and construction agreements, licenses, permits, and requests for utility services related to the development, design and construction of the project. Such utility services include, but are not limited to: electrical, water, sewer, natural gas, telecommunication, cable television, railroads and other modes of transportation. Further request the City Council to grant an exception to Phoenix City Code 42-20 to authorize inclusion in the documents pertaining to this transaction of indemnification and assumption of liability provisions that otherwise should be prohibited by Phoenix City Code 42-18. This authorization excludes any transaction involving an interest in real property.
Report
Summary
The purpose of this project is to provide a detailed evaluation to develop local controls or limits on industrial and non-domestic sources discharging to the 91st Avenue and 23rd Avenue Wastewater Treatment Plants.
Brown and Caldwell, Inc.’s services include, but are not limited to: review previous assessments, evaluations, studies, and other relevant sources; review historical upsets, interferences, or pass-through incidents at wastewater treatment plants; identify any significant changes at the wastewater treatment plants; identify pollutants of concern (POCs) that pose risks to wastewater treatment plants operations, biosolids quality for land application, the collection system, and City wastewater personnel; develop additional local limits as necessary; verify existing Maximum Allowable Headworks Loading (MAHL) calculations; consider sampling for uncontrollable contributions to obtain updates data for headworks analysis; develop and implement a sampling plan, if existing data is insufficient; determine whether existing MAHLs should be recalculated or reallocated; identify pollutants requiring further evaluation; assess whether existing industrial user loadings cumulatively exceed the Maximum Allowable Industrial Loading; recalculate MAHLs for updates local limits and determining MAHLs for new pollutants, considering business growth, and changes in the number of dischargers and discharge volumes; develop technically valid, effective, and enforceable methods for controlling POCs; coordinate with City staff as needed; prepare and present a draft report for review; and prepare and seal the final report for submission to the EPA and to the Arizona Department of Environmental Quality.
The 91st Avenue Wastewater Treatment Plant is owned by the Sub-Regional Operating Group (SROG) and operated by the City of Phoenix.
Procurement Information
The selection was made using a qualifications-based selection process set forth in Section 34-603 of the Arizona Revised Statutes (A.R.S.). In accordance with A.R.S. Section 34-603(H), the City may not publicly release information on proposals received or the scoring results until an agreement is awarded. Three firms submitted proposals and are listed below:
Selected Firm
Rank 1: Brown and Caldwell, Inc.
Additional Proposers
Rank 2: Hazen and Sawyer, P.C.
Rank 3: Geosyntec Consultants, Inc.
Contract Term
The term of the agreement is five years from the issuance of the Notice to Proceed. Work scope identified and incorporated into the agreement prior to the end of the term may be agreed to by the parties, and work may extend past the termination of the agreement. No additional changes may be executed after the end of the term.
Financial Impact
The agreement value for Brown and Caldwell, Inc., will not exceed $1,350,000, including all subconsultant and reimbursable costs.
Funding is available in the Water Services Department's Capital Improvement Program utilizing SROG funds.
Concurrence/Previous Council Action
The SROG Advisors authorized this project on September 17, 2026.
Department
Responsible Department
This item is submitted by Assistant City Manager Ginger Spencer, Deputy City Manager Frank McCune, the Water Services Department and the City Engineer.