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Pedestrian Unde ass Feasibility Study June 17, 1997 I <br /> � <br /> East Marietta Street and East Condit Street , <br /> The walls of the subway will be curved, thus requiring �I <br /> electrical conduit to be exposed on the surface and lighting , <br /> fixtures to be mounted to the concrete walls. <br /> As noted in Alternate 2, twenty-four hour lighting adds <br /> additional operation and maintenance costs to this altemate_ <br /> Installing the reinforced concrete pipe is a specialty item and <br /> requires experienced tunneling contractors. <br /> Snow and ice removal will be a maintenance item as noted <br /> in Alternate 2 above. <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 /> Alternate 4 - Advantages: Construction of the bridge piers and the bridge over the <br /> railroad will require flagging services. However, much of <br /> the construction activity away from the tracks will not <br /> require the presence of a flagman, thus saving costs. <br /> Lighting for the area can be mounted on the bridge and <br /> ramps or mounted on poies to improve security. <br /> Alternate 4 - Disadvantages: The existing tracks are about five feet above the Marietta <br /> Street"touchdown" points. The additional height required <br /> to gain elevation over the railroad will require a long system <br /> of spiral ramps, thus increasing the cost of the approach and <br /> pier structures. <br /> The bridge and structure will add an exposed maintenance <br /> structure for the city to maintain. In addition, ice and snow <br /> removal will be difficult and the bridge may become icy in <br /> certain conditions. <br /> Construction of an overpass will require the city to relocate <br /> an existing water main that lies near the center of the street. <br /> �P COlP01'QtIO1Z Page - 10 <br />