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Submitted by Bolton & Menk, Inc.Colleen Avenue Drainage Improvements | City of Arden Hills, Minnesota 3 Proposal for Colleen Avenue Drainage Improvements City of Arden Hills, Minnesota Project Understanding The City of Arden Hills designed the 2018 Street and Utility Improvement Project which is currently under construction. The project includes storm drainage improvements that tie into the existing system on Colleen Avenue. Further investigation into the Colleen Avenue drainage connections, outflows, ponding areas and wetlands was performed by WSB & Associates and summarized in the “Indian Oaks Area Downstream Drainage Review” Report dated March 12, 2018. This report is intended for use as the basis of final design. The report identifies several areas of concern for the Colleen Avenue drainage area, in regards to storm drainage, wetlands, conveyance and flooding. Per our discussions, the City desires to take action and design Colleen Avenue improvements identified in the Report. For the Colleen Avenue Drainage area, the report recommends: Upgrading the stormwater outlet into the Colleen Avenue wetland with a directionally drilled 18” HDPE pipe Replacing catch basins and connections to the outlet pipe Delineating the Colleen Wetland Securing permits for the drainage work Redesigning the bituminous trail downstream of the Colleen Wetland to provide a new outlet elevation Reestablishing an EOF north of Colleen Avenue to 1-foot below adjacent house openings Providing an outlet control structure for the Colleen Wetland Associated pavement repairs necessary for completion of the drainage improvements Detailed Work Plan Bolton & Menk understands the importance of not only achieving the desired outcome of each of the following tasks but also completing them on time and within budget, while developing an engineering solution that work for both the City and the residents. It is our commitment to facilitate a successful project for the City of Arden Hills. We will put special emphasis on working with city staff and affected residents to assure the project’s success. A summary of our approach to key project elements is outlined below. Task 1: Survey Services Project survey work includes a topographic survey to support the stormwater analysis and design of the recommended improvements on Colleen Avenue, the connection route to the Colleen Wetland and downstream of the Colleen Wetland, including the bituminous trail. A Gopher State One Call process for locating private utilities will be undertaken and marked utilities will be included in the project base mapping. Topographic survey work will be completed in around the properties at 1441, 1449, and 1457 Colleen Avenue where storm sewer improvements are planned. Topographic work will also be completed within 15 feet of each side of the existing trail. We understand some topographic survey work was completed for the City’s adjacent 2018 Street & Utility Improvements project. Prior to initiation of our survey activities, Bolton & Menk would request this information be provided to us so we may investigate opportunities for project savings by minimizing duplication of survey efforts. Some areas adjacent to the project area are rolling, heavily wooded terrain and/or are wetlands which are not to be impacted. LiDAR data will be relied upon for these areas to reduce costs of survey to the City, for which there would be limited benefit during design. Topographic survey data compiled by us, data compiled by others, and wetland delineation data will be combined with available LiDAR data over such areas to create the project base survey files. There are potential changes in the modeled surface water elevations following the project, and the impact on adjacent properties is not precisely known. Existing property easements from the area plats and nine O&E reports to be secured