Discussion and possible action to adopt RES. 2023-76 approving the Intergovernmental Agreement with the Flood Control District of Maricopa County for the local cost share of the 83rd Avenue/Peoria Avenue/Grand Avenue Drainage Improvements, in accordance with budget authority previously approved by Council.

The Peoria Storm Drain Master Plan (PSDMP) recommends that a combination of storm drain expansion and storm water storage be implemented north of Grand Avenue in order to mitigate peak storm water discharges to the downstream system and increase system capacity. This will also address localized flooding in the area of the study.

The City’s FY2023-FY2032 Capital Improvement Program (CIP) includes the 83^rd Avenue/Peoria Avenue/Grand Avenue Drainage Improvements project that provides funding for a study to examine the efficacy of constructing additional storm drain and a detention basin in south-central Peoria. The study area is bounded on the north by Cactus Road, on the east by 71^st Avenue, on the south by Peoria Avenue, and on the west by Grand Avenue and 87^th Avenue.  The proposed study will evaluate the acquisition of eight vacant parcels of land to be used as a stormwater storage site. The parcels are located at the southwest corner of 83^rd Avenue and Peoria Avenue adjacent to an existing City water facility known as Stone Street Well and Booster Pump Station.  This project also proposes storm drain extensions in Cholla Street, 83rd Avenue and Shangri La Road that will convey stormwater runoff to the proposed retention basin.

The study will also address local drainage issues within the study area and provide recommendations for improvements to prevent flood damage in the future. A public involvement effort to engage public input on drainage problems will be conducted to assist in inventorying drainage issues. The effort is anticipated to include mailings to residents and businesses within the study area, questionnaires, and social media outreach to increase awareness and encourage responsiveness. 

In 2020, the City submitted a proposal for the inclusion of this project in the Flood Control District of Maricopa County (FCDMC or District) CIP.  In order to receive FCDMC funding, an Intergovernmental Agreement (IGA) is necessary. The total Project cost is estimated to be $4,000,000, of which the District share of project costs is $2,600,000 (65%), and the City’s share is $1,400,000 (35%). The actual costs will be determined through the initial study (Design Concept Report).

The purpose of the IGA is to identify and define the responsibilities of the City and the District in connection with each phase of the project. The project will consist of a Design Concept Report phase, Final Design phase, Utility Relocation phase, and a Right-of-Way Acquisition phase. Currently, funding is available for the study or Design Concept Report phase.

Once the IGA is approved the City can move forward with the selection of a consultant to perform the study.  

No previous Council Actions for this project.

Staff recommends adoption of a resolution approving the Intergovernmental Agreement with the District for the local cost share for conducting a Design Concept Report phase and future anticipated Design phase, Utility Relocation phase, and Right of Way Acquisition phase for the 83rd Avenue/Peoria Avenue/Grand Avenue Drainage Improvements project.

Funding for the study or Design Concept Report phase of this project is available in the FY2023-FY2032 Capital Improvement Program in the 83^rd Avenue/Peoria Avenue/Grand Avenue Drainage Improvements project budget. Payments for the FCDMC portion of the cost share will be made from 4810-4810-543005-CIPDR-EN00740 and for the City’s cost share from account 4254-4254-543009-CIPDR-EN00740. Additional phases of the project are contingent upon funding availability within the City’s CIP. The study will determine the actual costs and phases needed for the project.