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City of Gem Lake Comprehensive Plan GEMLK 140643 Page 67 • Provides for the issuance of permits for and supervision of all connections to the municipal sanitary sewer system • Prescribes certain materials and methods to be used for said connections • Provides for licensing of sewer contractors • Prescribes penalties for the violation of the provisions of this ordinance City Ordinance 129 (attached in the appendix) requires the disconnection of existing foundation drains, sump pumps, and roof leaders from the sanitary sewer system. The timing of the possible expansions would depend on funding and need. The first priority would be to connect all commercial establishments to public sanitary sewer. A second priority would be properties where soil or topographic conditions make the installation of an ISTS difficult. 7.3.3.3 Current and Future Measures to Mitigate I/I The City of Gem Lake does not employee full time utility maintenance personnel to perform daily operation and maintenance on their sanitary sewer collection system. The City relies on contractors to perform the work needed to maintain the collection system through recommendations provided from their City engineer. The City of Gem Lake does not perform routine cleaning and closed-circuit television (CCTV) inspection but has contracted with a contractor to provide cleaning and CCTV television to reduce the potential for sewer backups and identify potential maintenance and I/I issues. Since Gem Lake is not directly metered by the MCES and no metering data is available for the sanitary sewer in the City, it is difficult to accurately estimate the quantity of I/I currently present in the system. It is assumed that the amount of I/I present in the system is relativity low since the majority of Gem Lake’s sanitary sewer system was constructed fairly recently with PVC pipe or was recently lined with the exception being the small amount of pipe serving a few properties in the East Sewer District. There were 75 houses built in Gem Lake before 1970 according to US Census data, this is about 1/3 of the total houses in the City and some of these properties may be connected to the sanitary sewer system. To date the City has not performed any evaluation of these service connections, however, the City will be doing an inspection of all the manholes in 2020, repairs in 2021, and will be flushing and televising the entire system in 2021. An analysis of I/I susceptibility will be performed for these pre-1970 connections as a part of this project. After inspection of the televising data, the City will begin an I/I investigation project that will include metering the sanitary sewer to quantify I/I during storm events. The planning level cost estimates for these projects is included as Table 7-6 below. As part of a routine maintenance program, the City of Gem Lake contracts for manhole inspection, sewer cleaning and CCTV inspection to inspect their entire sanitary sewer collection system. Over the past ten years of inspection program, the following issues have been found in the collection system. • Minor sag and gas service through the pipe • Pipe cracks, roots, and poor joints in sections • A root blockage, debris and joint failure in an isolated section of the pipe • Manhole lids which allow storm water to enter the system • Manhole casting rings are deteriorated and in need of repair Sewer rehabilitation in past years has included the following remedial measures which includes manhole replacement to reduce the potential for I/I entering the sanitary sewer collection system.