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Exhibit A <br /> removed from a portion of the existing underpass, the existing underpass can be removed <br /> and reconstructed. <br /> D. Perform preliminary design and sizing of primary superstructure elements—girders, <br /> stringers, floorbeams, ballast pan, bearin�s, etc. <br /> E. Determine total depth from top of rail to profile grade of under-passing roadway. <br /> F. Determine configuration and arrangement of substructures. <br /> G. Evaluate alternatives and formulate recommendation for proposed foundation system,using <br /> available geotechnical information. <br /> H. Evaluate alternatives and formulate recommendations for retaining wall systems required <br /> beyond both ends of bridge for lowered roadway <br /> L Develop preliminary estimate of cost for the railroad structure and associated retaining wall <br /> systems <br /> 2. The following will be performed far a structures study for the alternative of a highway bridge <br /> carrying an elevated Brush College Road over the NS railroad yard: <br /> A. Determine number, configuration, and length of spans <br /> B. Evaluate superstructure alternatives—PPC girder, steel beam, steel plate girder <br /> C. Formulate proposed cross sectional geometrics for the superstructure <br /> D. Perform preliminary design and sizing of primary superstructure elements—beams and <br /> concrete deck <br /> E. Determine total depth between profile grade line on overpassing roadway and top of rail of <br /> existing underpassing tracks <br /> F. Determine configuration and arrangement of substructures and associated foundation <br /> system. <br /> G. Evaluate alternatives and formulate recommendations for retaining wall systems required to <br /> support embankments of approach roadways beyond both ends of bridge. <br /> H. Evaluate methods to fill in the existing underpass while maintaining the CN underpass at the <br /> NS yard. <br /> L Develop preliminary estimate of cost for the roadway structure and associated retaining wall <br /> systems. <br /> 3. The following will be performed for a structures study for the alternative of a highway bridge <br /> carrying an elevated Brush College Road over the NS railroad yard but potentially rebuilding the CN <br /> underpass: <br /> A. Determine disposition of existing CN underpass if roadway overpass option is selected. <br /> B. Inspect the existing substructure supporting the superstructure over the CN track. Determine <br /> the condition of the substructure and provide an assessment for leaving the existing <br /> substructure in place. <br /> C. If it is determined that the CN underpass is to be reconstructed, develop construction scheme <br /> for replacement. <br /> D. Evaluate superstructure alternatives. As a minimum, maintain existing vertical clearance. <br /> E. Formulate proposed cross sectional geometrics for superstructure. <br /> Scope 6-4-10 A-11 <br />