Appendix B: Comprehensive Sanitary Sewer Plan Update - 2017

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COMPREHENSIVE SANITARY SEWER STUDY UPDATE IN COORDINATION WITH 2040 COMPREHENSIVE PLAN UPDATE CITY OF RAMSEY, MINNESOTA A. PURPOSE The purpose for this report is to update the City's 2012 Comprehensive Sanitary Sewer Study based on current population and land use projections. The 2012 Comprehensive Sanitary Sewer Study included a plan for meeting the City's infrastructure needs based on development projected within the City's 2030 Comprehensive Plan. City staff has identified development which has occurred since the 2012 study was completed and has provided projections for development which is likely to occur in the next 23 years (Year 2040). This report evaluates the impact of the recent and projected development on the proposed sanitary sewer infrastructure implementation. The following paragraphs present a summary of key updates to the 2012 plan. The intent is to complete the following: • Estimate costs associated with infrastructure needed to serve future development areas, • Provide estimations of growth and development anticipated through Year 2040, and • Develop a connection amount based on the estimated costs and development. B. SUMMARY OF INFRASTRUCTURE REVISIONS TO THE 2012 COMPREHENSIVE PLAN Section 4 of the 2012 report describes the trunk infrastructure improvements needed to serve each defined subdistrict within the MUSA boundary. For this report, each subdistrict was reviewed and revisions were made to the required infrastructure based on: • Improvements made over the last 5 years, and • Considerations of improvements required. Through discussions with the City, we were able to determine the improvements made within each subdistrict over the last 5 years. We also made revisions based on anticipated development patterns and anticipated future needs. The following paragraphs describe the revisions made within each subdistrict to allow us to quantify the total improvement costs throughout the City. We attached the updated 2017 "Proposed Trunk Sewer Extensions" map showing the subdistricts and the proposed trunk sewer extensions. 1. Subdistrict M3 This subdistrict is located in the Southwest corner of the City, south of Highway 10. The primary sewer crossing of Trunk Highway 10 has been completed and was removed from the figure and cost estimate. The Bower's Drive NW trunk sanitary sewer line has been converted from a trunk facility to a lateral sewer line. This line was removed from the 2017 proposed trunk sewer extensions as it is now anticipated to serve the area as a standard lateral line. All trunk line project costs have been updated to 2017 unit prices. City of Ramsey, Minnesota — R16.110056 Page 1 Comprehensive Sewer Plan Update Prepared by Bolton & Menk, Inc.