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. <br /> CMP Part 4C. Comprehensive Sewer Policv Plan <br /> 7) EXISTING INDIVIDUAL SYSTEM IMPROVEMENTS - The On-Site <br /> Management Program is expected to continue enforcing major <br /> improvements to, or replacement of, existing on-site systems per City <br /> ordinances if and when they are determined to be failing. <br /> Table 4C-15 indicates the anticipated new sewer connections by year during the <br /> period 2010-2020. Note that because there is no defined staging for addition of <br /> these connections, the timing shown below is at best speculative and should not <br /> be construed as a staging plan. <br /> .� <br /> Table 4C-1�: Expected New Sewer Connections (RECs) by Year: 2010-2020 <br /> 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Total <br /> Interce tor <br /> LS-59 1� 1� 1� 10 l� 10 1� 10 1� 1� l� ll� <br /> Ls-6o 10 50 100 50 100 50 40 40 40 30 27 537 <br /> Downstream Interceptors 8 8 8 8 8 8 8 8 8 8 7 87 <br /> wayzata Direct 5 �0 2 2 0 0 0 0 0 0 0 �9 <br /> Plymouth Direct � 0 � 0 � � � 0 � � � � <br /> 1'ota�New Connections 33 98 120 70 118 68 58 58 58 48 44 773 <br /> CONSTRUCTION DESIGN STANDARDS FOR NEW SEWERS <br /> The original segments of the Orono sewer system date to 1963-1965 when the <br /> lateral system serving much of the Navarre area was installed, connecting to what <br /> is now the Metro forcemain system ending at LS-59 on Old Crystal Bay Road <br /> South. The initial lateral system was constructed of clay tile, which is now 40- <br /> plus years old and beginning to show signs of abing, such as shifting, cracking, <br /> and increased infiltration problems. Because portions of the system are at or <br /> below the level of Lake Minnetonka, infiltration management has been an <br /> ongoing task for the City. In the 1970s a shift to use of PVC pipe occurred for <br /> new installations, reducing the incidence of joint failure and thus reducing the <br /> potential for infiltration. <br /> Graviry Sewers vs Pressure Sewers. Historically, Orono strived to provide gravity <br /> sewer system laterals wherever possible for ease of maintenance and to allow for <br /> direct connections to homes with minimal homeowner maintenance <br /> responsibility. However, a number of factors have changed this, including: <br /> - the substantially lower construction costs of a pressure system vs. a <br /> gravity system; <br /> Citv of Orono Community Management Plan 2008-2030 Page 4C-61 <br />