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Complete Preliminary Engineering Report Lyon Township Roscommon County, Michigan PRELIMINARY ENGINEERING REPORT Wastewater Collection and Treatment System March 2020 F&V Project No. 839780 Prepared by : LYON TOWNSHIP – PRELIMINARY ENGINEERING REPORT PAGE ii This page is intentionally left blank LYON TOWNSHIP – PRELIMINARY ENGINEERING REPORT PAGE iii I. Table of Contents I. Table of Contents .................................................................................................................................. iii II. Introduction and Executive Summary ................................................................................................... 1 III. Project Background ........................................................................................................................... 1 A. Project Planning Area ....................................................................................................................... 1 1. Location ......................................................................................................................................... 1 2. Historic Environmental Concerns .................................................................................................. 3 3. Environmental Resources Present................................................................................................ 3 4. Growth Areas and Population Trends ........................................................................................... 4 B. Existing Facilities ............................................................................................................................... 5 1. Location Map ................................................................................................................................. 5 2. History ........................................................................................................................................... 5 3. Description .................................................................................................................................... 6 4. Condition of Existing Facilities ...................................................................................................... 6 C. Need for Project ................................................................................................................................ 7 1. Health, Sanitation, and Security .................................................................................................... 7 2. Future Environment without Proposed Project ........................................................................... 11 D. Public Engagement ......................................................................................................................... 11 IV. Collection Alternatives Considered ................................................................................................. 14 A. No Action ......................................................................................................................................... 14 B. Optimizing Performance of Existing Systems ................................................................................. 14 C. Hybrid Gravity Sewer & Low Pressure (STEP) Collection .............................................................. 15 D. Low Pressure Collection ................................................................................................................. 17 V. Wastewater Treatment Alternatives .................................................................................................... 20 A. No Action ......................................................................................................................................... 20 B. Regional Alternative ........................................................................................................................ 20 HLUA WWTP Alternative .................................................................................................................... 25 Markey Township WWTP Alternative ................................................................................................. 25 Village of Roscommon Alternative ...................................................................................................... 25 C. Centralized Wastewater Treatment Systems .................................................................................. 20 VI. Selection of Alternative ................................................................................................................... 28 A. Life Cycle Cost Analysis .................................................................................................................. 28 Collection System ............................................................................................................................... 28 Treatment System ............................................................................................................................... 29 Non-Monetary Factors ........................................................................................................................ 29 LYON TOWNSHIP – PRELIMINARY ENGINEERING REPORT PAGE iv VII. Proposed Project (Recommended Alternative) ............................................................................. 294 A. Collection System ........................................................................................................................... 30 B. Wastewater Treatment .................................................................................................................... 31 C. Project Funding Approach ............................................................................................................... 31 List of Appendices Appendix A – Figures Figure 1 Higgins Lake Area Map Figure 2 National Wetlands Inventory Map Figure 3. Higgins Lake Area Study Map Figure 4A Preliminary Sewer Collection System – Hybrid Collection System Figure 4B Preliminary Sewer Collection System – Hybrid Collection System, Cont’d. Figure 5A Preliminary Sewer Collection System – Low Pressure System Figure 5B Preliminary Sewer Collection System – Low Pressure System, Cont’d. Figure 6 Regional WWTP Locations Figure 7 Preliminary WWTP Location Map Figure 8 Preliminary WWTP Aerated Lagoon Diagram Figure 9 Preliminary WWTP Mechanical WWTP Diagram Appendix B – Tables No. Description 1. Overall Cost Summary 2. Engineer’s Estimate of Probable Cost – Hybrid Gravity/Low Pressure 3. Engineer’s Estimate of Probable Cost – Low Pressure System 4. Engineer’s Estimate of Probable Cost –Aerated Lagoon WWTP 5. Engineer’s Estimate of Probable Cost –Mechanical WWTP 6. Engineer’s Estimate of Probable Cost –East & West Mechanical WWTP 7. Engineer’s Estimate of Probable Cost –Regional + Mechanical WWTP 8. Engineer’s Estimate of Probable Cost –10% Markey Twp. WWTP + Mechanical WWTP 9. Engineer’s Estimate of Probable Cost –50% Markey Twp WWTP Expansion + Mechanical WWTP 10. Engineer’s Estimate of Probable Cost –100% Markey Twp WWTP Expansion PER Summary Tables 11. Operating Budget 12. Present Worth Analysis & Short-Lived Depreciation – Collection System 13. Present Worth Analysis & Short-Lived Depreciation – WWTP 14. Bond Schedule Appendix C – Correspondence 1. Letter of Support Appendix D – Previous Lake Studies and Reports 1. 2019 Higgins Lake Report – Preliminary Draft (MSU, 2019) LYON TOWNSHIP – PRELIMINARY ENGINEERING REPORT PAGE v 2. Changes in nearshore water quality from 1995 to 2014 and associated linkages to septic systems in Higgins Lake, MI (Higgins Lake Foundation, 2014) 3. Higgins Lake Watershed Management plan; (Higgins Lake Watershed Partnership, 2007) 4. Effects of Residential Development on the Water Quality of Higgins Lake (USGS, 2001) 5. Water Quality Study of Higgins Lake (UofM, Fairchild & Schultz, 1984) 6. Report on Higgins Lake Roscommon County Michigan, EPA Region V, Working Paper No. 195 (US EPA Natural Eutrophication Survey, 1975) Appendix E – F&V Public Informational Meeting Presentation 1. F&V Presentation Appendix F – Letters of Support LYON TOWNSHIP – PRELIMINARY ENGINEERING REPORT PAGE vi This page is intentionally left blank LYON TOWNSHIP – PRELIMINARY ENGINEERING REPORT PAGE 1 II. Introduction and Executive Summary The Lyon Township Preliminary Engineering Report (PER) was prepared to fulfill the project planning requirements of the United States Department of Agriculture, Rural Development, Rural Utilities Service – Water and Wastewater Programs. The purpose of this Feasibility Study is to describe the need for a public sewer system and evaluate alternatives for design and construction of a sanitary sewer collection system and wastewater treatment facility (WWTP) to serve properties near Higgins Lake. This Feasibility Study represents a joint effort by Lyon Township and Gerrish Township of Roscommon County. Lyon and Gerrish Townships comprise most of the Higgins Lake lakeshore and hold a shared interest in protecting the lake and its water quality, as well as share similar geological and land use challenges. Lyon Township received a USDA Rural Development SEARCH grant in 2019 to be used to complete preliminary project planning to explore the feasibility of the potential construction of a new sanitary sewer collection and treatment system. This PER describes problems with existing onsite wastewater systems within the service area, onsite wastewater facilities, evaluates the need for a public sewer system to protect water quality
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