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Figure 2 shows the proper separation of sanitary sewers and storm drains. <br /> • <br /> Fig 2; - <br /> H 11 <br /> 4,111 11 <br /> � d j <br /> [Jot h'1[RC$�ti LiE �6' ^`• p�C, O ��` S\�\ <br /> f <br /> iP.e.�ii n0� iJs�Ei tiOU � 4�•` S` �-� �-- C`` <br /> SANITARY SEWER 0 STORM DRA N <br /> j <br /> STORM _ <br /> � 1C:aTER <br /> Separate Systems �,UT�A« - <br /> • SANITARY SEWER l <br /> STORM DRAIN I� <br /> MISSISSIPPI RIVER <br /> (Flow io 1:�:u;.,r, riarn) <br /> One Alternative is Rain Leader Disconnect - During any rain event non-point source <br /> pollution,via surface drainage, enters the storm sewer system and is transported to its <br /> receiving body. As a storm increases in intensity, another problem arises: combined <br /> sewer overflow (CSO). CSO occurs when a sanitary sewer exceeds its capacity and <br /> overflows through an overflow regulator into an adjacent storm sewer to prevent sewage <br /> backflows into.homes, businesses, and property. Contributors to this problem are area <br /> roof drains and other surface area drainage that are connected to the sanitary sewer <br /> system. The.MMRWMO looks to address this problem by eliminating these connections. <br /> By-elirriinating.these.connections, the capacity of-the sanitary system.can be-maintained <br /> for_its_intended_use,and--the CSO.regulators can be removed. Areas where.cross- <br /> connections:exist.between.the.sanitary and.storm.sewers-,z-111 be the primary targets-for <br /> this-.program.:The-estimated-cost to disconnect a rain.leade'r for a residential.property is <br /> _approximatelyS754150; for a commercial or industrial property the cost can:run from <br /> $75 - $100,000. <br /> Combined Sewer Overflows Pronrrrnr <br />