Consideration and Approval of Grant Agreement:  A Grant Agreement between the City of Flagstaff and the Arizona Department of Transportation, Multimodal Planning Division Aeronautics Group for the Airport Drainage Study.

The Federal Aviation Administration under Federal Air Regulation Advisory Circular 150/5320-5D gives the following guideline: "Storm drainage design is an integral component in the design of transportation facilities. Drainage design for transportation facilities must strive to maintain compatibility and minimize interference with existing drainage patterns, control flooding of the pavement surface for design flood events, and minimize potential environmental impacts from the facility-related storm water runoff."

A drainage system study was done prior to the lengthening of the runway in 2008. There are currently projects planned on airport, such as new hangar tenant projects, and off airport, such as the extension of JW Powell to Lake Mary Road, that could influence the existing storm water runoff from the airport. This study will assist in preparing for these as well as any changes that may have occurred since the 2008 runway project.

This Grant will cover $315,000 (90%) dollars, the City of Flagstaff will cover $35,000 (10%) for a total project cost of $350,000.  The project is budgeted in account number 221-07-222-3352-0-4421 for $350,000.

COUNCIL GOALS:

3) Provide sustainable and equitable public facilities, services, and infrastructure systems in an efficient and effective manner to serve all population areas and demographics
6) Provide a well-managed transportation system
7) Continue to implement the Flagstaff Regional Plan and focus efforts on specific plans
11) Ensure that we are as prepared as possible for extreme weather events

There has not been a previous Council Decision on this Grant Application for Airport Drainage Study.

The City of Flagstaff could accept this Grant which will cover 90% of the cost for the Airport Drainage Study. This would reduce the final cost to the City of Flagstaff by $315,000.

The City of Flagstaff could reject this Grant and cover the entire cost. This would cost the City of Flagstaff $350,000.

The City of Flagstaff could reject the Grant and not do the study, which could leave the City of Flagstaff at risk of punitive action by the FAA and EPA for not being compliant with Federal Standards.

In 2008, the Flagstaff Airport hired a consultant to do an Environmental Impact Study, which studied the storm water drainage from the runway extension. This included adding weirs in the drainage off of the airport in order to slow the water flow from large rain events from impacting down stream. Airport Staff must monitor all rain events that collect in the principle storm water runoff areas of the airport. They are monitoring for any possible containments that might be collected and discharged into storm water runoff. No illegal discharges have been found in the airport storm water runoff.




 

The routing of JW Powell from Pulliam Drive to Lake Mary Road will run adjacent to the existing Airport storm water runoff area. This project can help identify possible needs for the extension of JW Powell. The extension of JW Powell is important to the future of ground transportation for Flagstaff.

This project will identify any needed changes or improvements to control storm water runoff down stream from the Airport.

Inform, this project will provide information for the Airport and community concerning the safe control of storm water runoff from the Airport