Rail Rapid Transit on the Alexandria- Springfield Route Lafayette Square to Four Mile Run

摘要

This report sets forth the results of preliminary engineering studies, estimates of cost and preliminary plans for the proposed facility. Existing base maps and uncontrolled aerial photographs have been used as a basis in development of the alignment. U. S. G. S. maps, supplemented by plans of existing completed facilities within the area of the project, have been used to determine existing ground line and topography. Soils and foundation conditions have been determined through an examination of existing available geological maps and reports, supplemented by available subsurface borings plus ten new borings made specifically in connection with this project. This project will include the use of tunneling, cut-and-cover, open cut and aerial types of structure. Careful consideration has been given to all design details to assure that the physical structures would be aesthetically in keeping with the Capital environs. Design criteria supplied by the National Capital Transportation Agency have been used as a guide in the design of structures, stations, and supporting facilities. Functional plans for stations have been prepared, based on data provided by the National Capital Transportation Agency staff. This study does not include an analysis of trackwork, power supply, power distribution, or signalization.