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220 <br />Table 64: Sewer Flow Forecasts for North Trott Brook Sewer District <br />orth <br />rott <br />rook <br />ewer <br />istrict <br />Year Households <br />2020 <br />2030 <br />2040 <br />672 <br />1089 <br />1288 <br />Peak Flow Employment Peak Flow Tota <br />Projection- (Sewer) Projection- Fl <br />MGD MGD <br />0.2 <br />0.2 <br />0.3 <br />42 <br />48 <br />52 <br />0.0 <br />0.0 <br />0.0 <br />0.2 <br />0.2 <br />0.3 <br />'ssissippi <br />'ver <br />ewer <br />istrict <br />2020 2084 0.5 5825 1.3 1.8 <br />2030 3379 0.8 6584 1.5 2.3 <br />2040 3998 0.9 7087 1.6 2.5 <br />um <br />'ver <br />ewer <br />2164 0.5 413 0.1 0.6 2164 <br />3512 0.8 467 0.1 0.9 3512 <br />4154 0.9 502 0.1 1.0 4154 <br />Inflow and Infiltration <br />Groundwater infiltration and surface water inflows, often called infiltration/inflow (I/I), may <br />contribute a substantial amount of municipal wastewater volume. Reducing I/I through proper <br />design, construction, maintenance, and other interventions can reduce the strain this puts on <br />municipal wastewater systems. <br />The Inflow and Infiltration (I/I) goal established for the City of Ramsey varies based on annual <br />average flow for each connection point to the Metropolitan Disposal System (MDS). The <br />Metropolitan Council's metering program shows that the City's 2017 annual average flow at meter <br />M302 was 0.567 mgd. The current I/I goal for the City of Ramsey at this point is an allowable peak <br />hourly flow of 2.54 mgd. The 2017 annual flow at meter M304 was 0.279 mgd. The current I/I goal <br />for Ramsey at this point is an allowable peak hourly flow of 1.29 mgd. <br />The City continues to monitor the integrity of its Sanitary Sewer infrastructure. The City has had a <br />Sewer Vac truck since 2009 and have a program in place to clean one third of the Sanitary Sewer <br />system each year In addition to cleaning the existing sewer system, the City has a program in place <br />to televise one tenth of the system each year to monitor for I/I issues. The City has historically <br />spent approximately $10,000 per year televising and mitigating I/I issues that are discovered <br />during the televising process. Items that are repaired though this process include: private utility <br />hits, leaking joints, collapsed pipes and leaking manholes. The City does not have an ordinance that <br />prohibits the connection of sump pump, rain leaders, or passive drain tile from the sanitary sewer <br />system. The City of Ramsey has adopted the Minnesota State Building Code, which states that <br />drainage systems shall discharge into an approved sewer system or to daylight (§R405.2.3) and <br />storm sewer systems shall not drain into sewers intended for sanitary sewage only (§4715.2700). <br />The City of Ramsey interprets that these systems must drain to daylight only unless storm sewer is <br />available on -site. The City of Ramsey will explore the need for such ordinances if it is determined <br />the City is not meeting the established I/I goal. <br />city of RAMSEY <br />Comprehensive Plan 2040 <br />