Consider Collector Roads and Trunk Utility Infrastructure for Trott Brook North Planning Area

The purpose of this case is to authorize an infrastructure study for the Trott Brook North Planning Area. The Trott Brook North Planning area is an area generally north of Trott Brook, south of 175th Avenue/173rd Avenue between Nowthen Boulevard and Variolite Street. This would be a similar infrastructure study as used with the Riverstone South development, although a much smaller scope. 

There are 2 active development proposals within the Planning Area (Hunt Addition and Makowsky Addition). Both require Trunk Water and Sanitary Sewer Extensions. Additionally, both will require turn lanes on Nowthen Boulevard and the paving of 173rd Avenue. This infrastructure is a high-level planning level study that will lay out expectations for the Developer and help develop a fair cost allocation between the 2 projects. 

15 minutes

This case is to authorize the work order only, not to approve a study or any cost share framework. Those will come at future steps. 

• Priority Infrastructure Study Needs
  • Trunk Water
  • Trunk Sanitary Sewer
• Secondary Infrastructure Study Needs
  • Nowthen Boulevard Improvements
  • 175th Avenue Improvements

Emphasis was intentionally highlighted on sanitary sewer. This is the largest unknown at this point. Currently, the Hunt Addition is reliant on a sanitary sewer extension through the Makowsky Addition. If the Makowsky Addition does not move forward, the City must look at different alternatives. The first, and most critical part of the study is an examination of the capacity of the existing Lift Station in the Brookfield Neighborhood. That will aide Staff in determining other scenarios/alternatives as part of the study. The City is responsible for the Trunk System. Staff is not even able to delegate any additional engineering without first knowing this existing capacity. 

It is common for the City to set minimum expectations on these shared/collector infrastructure needs and feels that it is a far better use of the City's time for the City to manage shared/collector infrastructure and allow private development to build off of that. 

The City has a high-level Comprehensive Water and Comprehensive Sanitary Sewer Plan in place for ultimate build out. However, that does not do the necessary 'deeper dive' nor discuss phasing alternatives. 

Study Costs

Per the recommendation of the Public Works Committee, it is proposed to evenly split the costs of the study between the Makowsky Addition, Hunt Addition and the City. Both Developers have agreed to the cost share and will contribute their pro-rata share up front. 

• $14,860 for Infrastructure Study
• $9,260 for Lift Station Analysis

Future Capital Costs

Other than potential cost share for Nowthen Boulevard and 175th Avenue, Staff would recommend that the 2 Developers be responsible for all costs internal to the sites. The City may construct 173rd Avenue and assess the costs back to the adjacent developments. No assessments would be allocated to existing homes at this time. 

The Public Works Committee recommends that the City Council authorize the Infrastructure Study by Bolton and Menk for the Trott Brook North Planning Area, with equal contributions from the City, Makowsky Addition and Hunt Addition. 

The Public Works Committee understood the need for the study, but asked for the Developers to contribute their share up front. Both Developers have agreed to this scenario. 

Motion to authorize the Infrastructure Study by Bolton and Menk for the Trott Brook North Planning Area with a cost share from the Makowsky Addition and Hunt Addition.