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CMP Part 4B. Sanitary Sewer Plan <br /> City Of Orono Projections <br /> Table 4B-9 also projects the number of Institutional and residential systems for 2010, 2020, 2030, <br /> and 2040. The table below depicts the projected number of septic systems in Orono based on <br /> development projections for the rural area. <br /> °.2044 2034. ...E 244D <br /> Institutional Septic Systems <br /> Residential Septic Systems 1041 -I024 1100 1110 <br /> 104 1029 4-145 1115 <br /> Actual number from 2008 <br /> 1. Actual number from ISTS data base as of 2018 <br /> 1. City Staff Estimates <br /> INFLOW AND INFIL TRA TION <br /> General <br /> Inflow is water, typically stormwater, which enters the sewer system through broken manhole <br /> covers, sewer cleanouts, sump pumps, foundation drains, and rain leaders. Infiltration is water, <br /> typically groundwater, which leaks into the sewer system through cracks in the sewer mains, <br /> laterals,joints, and manholes. <br /> Water from inflow and infiltration (I/I) can consume available capacity in the wastewater <br /> collection system and increase the flow into treatment facilities. In extreme cases,the added flow <br /> can cause bypasses or overflows of raw wastewater. This extra flow also requires a larger capacity <br /> in the city's collection and treatment components,which results in increased capital,operation and <br /> maintenance, and replacement costs. As a sewer system ages and deteriorates, I/I can become an <br /> increasing burden on a City's system. Therefore, it is imperative that I/I be reduced whenever it is <br /> cost effective to do so. <br /> The MCES has established I/I goals for each community discharging wastewater into the <br /> Metropolitan Disposal System (MDS) based on average day flows and allowable peaking factors. <br /> In February 2006,the MCES began an I/I Surcharge Program which requires communities within <br /> their service area to eliminate excessive I/I over a period of time. Now, communities that exceed <br /> their wastewater flow program year goals, will be required to complete an I/I mitigation <br /> assignment that will be required to be implemented in 2018. Nonetheless, flow metering data is <br /> available for the meter sheds within Orono, and an analysis of this data as it relates to I/I is <br /> presented on the following page. The City's strategies, programs, investments, and goals for <br /> reducing I/I are listed in this section as well <br /> City of Orono Community Management Plan 2020-2040 Part 4B, Page 13 <br />