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Title:
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Amend Intergovernmental Agreement with Flood Control District of Maricopa County for 27th Avenue and Olney Avenue Storm Drain Project (Ordinance S-46790)
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Title
Amend Intergovernmental Agreement with Flood Control District of Maricopa County for 27th Avenue and Olney Avenue Storm Drain Project (Ordinance S-46790)
Description
Request to authorize the City Manager, or his designee, to amend the Intergovernmental Agreement (IGA) 148280 with the Flood Control District of Maricopa County (FCDMC) for the 27th Avenue and Olney Avenue Storm Drain Project. Further request authorization for the City Treasurer to accept, and the City Controller to disburse, all funds related to this item. The request is to amend the original IGA to increase the overall estimated cost of the project and to reflect the FCDMC's request to perform right of way and easement acquisition efforts for the project. Although the estimated project cost has increased, the City's anticipated costs will not exceed the $3 million authorized by previous Council action.
Report
Summary
In late 2015, the FCDMC, in partnership with the City of Phoenix, initiated a study to update the Laveen Area Drainage Master Plan for the South Phoenix/Laveen area using mapping and comprehensive flood model software. One of the projects identified through that study effort was the 27th Avenue and Olney Avenue Storm Drain project. The storm drain project will construct a 72-inch diameter storm drain in Olney Avenue from about 24th Drive west to 27th Avenue, then north on 27th Avenue to the existing 27th Avenue and South Mountain Avenue regional basin. This storm drain would have inlets at multiple locations along Olney Avenue and 27th Avenue to intercept drainage, including a large inlet for the subdivision retention basin just south of the Western Canal. The FCDMC has been leading project development and the storm drain project is currently at the 90 percent design level.
The revised project cost estimate is $10.8 million, which is a $4.8 million increase from the original $6 million cost estimated in a planning level study. According to the FCDMC, the cost increase is due to the following:
Higher construction costs associated with cost indices of construction components in the Phoenix Metro area, which have increased approximately 20 to 40 percent over the last four years.
Construction zone access and egress is limited and includes shorter time-windows for construction due to existing residential and commercial properties along the project corridor.
Financial Impact
The terms of IGA 148280 between the City and the FCDMC include a joint cost share for project development, including design, right of way acquisition, temporary construction easements, utility relocations, storm drain construction, construction management, post design, materials testing, and other related costs necessary to implement the 27th Avenue and Olney Avenue Storm Drain Project.
The cost-share distribution between the City and the FCDMC will maintain an overall 50/50 cost share (the standard cost share for projects funded by FCDMC), which will be calculated across the following projects.
Durango Regional Conveyance Channel (DRCC) Project.
South Phoenix/Laveen Area Drainage Projects.
Rawhide Wash Project.
The FCDMC and City entered into IGA 131924 for the $14 million DRCC project, and included a City contribution of $5.5 million. The DRCC project was recently completed and realized a savings of $2,559,206.32 to the City's approved contribution.
Although the revised 27th Avenue and Olney Avenue Storm Drain Project cost estimate has increased by $4.8 million from $6 million to $10.8 million, the City's $2.4 million share of that increase will be offset by the credits from the DRCC project cost savings. The FCDMC will apply the City's credit from the DRCC project to the City's $3 million contribution to the 27th Avenue and Olney Avenue Storm Drain project.
Concurrence/Previous Council Action
The Transportation and Infrastructure Subcommittee recommended Council approval to enter into IGA 148280 for the 27th Avenue and Olney Avenue Storm Drain project at its Feb. 13, 2018 meeting by a vote of 4-0.
The City Council approved entering into IGA 148280 for the 27th Avenue and Olney Avenue Storm Drain Project on March 7, 2018 (Ordinance S-44314).
The City Council approved Amendment 1 to IGA 148280 for the 27th Avenue and Olney Avenue Storm Drain Project to construct three storm drainage basins on March 20, 2019 (Ordinance S-45471).
Location
The project is generally located along Olney Avenue and 27th Avenue going north to the 27th Avenue and South Mountain Avenue Regional Drainage Basin.
Council District: 8
Department
Responsible Department
This item is submitted by Deputy City Managers Karen Peters and Mario Paniagua, and the Street Transportation and Public Works departments.