Agenda Packets - 2020/10/12 - Laserfiche WebLink

Home Browse Search

COMPREHENSIVE SEWER PLAN Infiltration and Inflow (1/1) September 15, 2020 o. 1.2 GOALS, POLICIES, AND STRATEGIES TO ADDRESS 1/1 Since excess 1/1 is a local concern to Mounds View as well as a regional concern to Metropolitan Council, Mounds View will continue to work on reducing 1/1 in its sanitary sewer. The City's goals generally are to identify and prevent 1/1 from exceeding local and regional system capacity and causing local backups, and to work to remove 1/1 from the system to the greatest extent practicable. Specific strategies include: • Preserve capacity in the local and regional system • Minimize 1/1 in the system • Prevent excessive 1/I, backups, and overflows Sump pump, foundation drain, and roof drain connections to the sanitary sewer system are prohibited by Chapter 907 of the Mounds View City Code (Appendix E) and existing systems are further required to be disconnected from the sanitary sewer system, and the City works to prevent 1/1 through inspection of connections to the sanitary sewer system. The City also uses modern materials and standards in new construction to prevent 1/I. The focus of 1/1 mitigation efforts has been on the public improvements side through CIPP lining and manhole sealing improvements. 1/1 mitigation on the private side is addressed voluntarily through educational efforts. The City has started to meter private sanitary sewer systems and will be working with property owners on reducing 1/1 in the systems. The City has also adopted a Water Preservation Program, or "H2OPP". The two primary goals of the H2OPP are preserving and conserving water, by educating residents and business owners with infographics on the need to protect groundwater and to reduce what is being sent down the sanitary sewer and stormwater system. 5.1.3 1/1 IMPLEMENTATION PLAN Since 2016, the City has invested over $400,000 in trunk sewer projects specifically to address 1/1. The work includes sewer repairs/rehabilitation/replacement, CIPP pipe lining, manhole structure lining, grouting of service connections, and abandoning unused service leads. The City has replaced most vented manhole covers and inspects them annually. Annual maintenance operations include manhole sealing, where significant leaks are encountered. In Fall 2019, the City Council approved a Point -of -Sale program that went into effect January 1, 2020, in which property owners that are selling or transferring the title to their property must have their lateral sewer line televised and, if needed, rehabilitated. Ongoing/future implementation activities to prevent or eliminate excessive 1/1 from the system include • Annually televise and inspect sewer facilities for degradation and leaks • Inspect sanitary sewer facilities in response to backup notifications and in coordination with the street reconstruction program • Perform repairs or rehabilitation of sewer facilities as needed • Replace old sewers as part of street and utility reconstruction • Install new sewer facilities in accordance with current standards for materials and construction �1 J v:\1938\active\193804167\reports\2018 csp\submitted to city 9-8-2020\moundsviewcsp_formcesreview_09152020_updateddraft.docx 5.10