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Pedestrian Underpass Feasibility Study June 17, 1997 <br /> East Marietta Street and East Condit Street <br /> limited in the number of personnel available to perform this <br /> work and their own capital improvement work may take <br /> precedence over this project;thus causing delays to a <br /> contractor_ The railroad will also require a flagman on the <br /> site during much of the construction time. <br /> Construction of a subway will require the city to relocate an <br /> existing water ma.in that lies near the center of the street. <br /> Lighting in the subway will be required 24 hours a day, thus <br /> increasing operation and ma.i.ntenance costs. <br /> Snow and ice removal will be a maintenance item_ A subway <br /> rvill allow the use of snow removal equipment, however, <br /> melting will not occur in protected areas during freezing <br /> conditions. <br /> Aitemate 3 - Advantages Installation of a reinforced concrete pipe will provide <br /> minimal interruption to rail traffic. <br /> Storm drainaae can be incorporated in the concrete floor as <br /> it is poured in the pipe. <br /> Altemate 3 - Disadvantages: To construct the reinforced concrete pipe there must be <br /> additional earth cover between the top of the pipe and the <br /> bottom of railroad tie_ This will lower the floor of the <br /> subway and require a deeper pump station pit and longer <br /> . ramps. Maintenance of the pump station and floor of the <br /> ramps and structure, as noted in Alternate 2, also apply to <br /> Alternate 3. <br /> Concrete pipe of the size required to provide a 10 foot <br /> � walkway will be expensive to manufacture and ship. Pipe <br /> manufacture's are ava.ilable in either St. Louis or Chica�o, <br /> however, shipping pipe sections of this large diameter will <br /> require special permits. The pipe could be cast in the <br /> Decatur area but will require special forms and controlled <br /> curing to meet specifications. <br /> �P COT�JOTQt101Z Page - 9 <br />