962 Changing sidewalk widths, etc . Sidewalks and curbs. Open comp etition for street improvement contracts. Repairs f or inferior work, etc., by contrac- tors, required for addi- tional period . Bridges. Construction, etc . Connecticut Avenue, over Khngle Valley . New bridge. Proviso . Maintenance, etc ., of underground or over- head trolley . Payment of cost of exces s con stru ction . Monroe Street NE. Viaduct, etc ., recon- struction over B .&O. tracks, at . Vol. 45, p. 1437. Provisos . One-half cost ho me by railroad company. SEVENTY-FIRST CONGRESS . SESS . II. Cu. 848. 1930 . The Commissioners of the District of Columbia are authorized and empowered, in their discretion, to fix or alter the respective widths of sidewalks and roadways (including tree spaces and parking) of all highways that may be improved under appropriations contained in this Act . For construction and repair of sidewalks and curbs around public reservations and municipal and United States buildings, $20,000 . No part of any appropriation contained in this Act shall be avail able for repa iring, resurfa cing, or newl y paving any street, avenue, or roadway by private contract unless the specifications for such work shall be so prepared as to permit of fair and open competition in paving material as well as in price . In addition to the provision of existing law requiring contractors to keep new pavement s in repair fo r a period of one year from the date of the completion of the work, the Commissioners of the District of Columbia shall further require that where repairs are necessary during the four years following the said one .year period, due to inferior work or defective materials, such repairs shall be made at the exp ense of the c ontractor, and the bond fur nished by the con- tractor shall be liable for such expense . BRIDGES For constructi on maintenanc e, operation, and repair of bridges, including persona services and maintenance of nonpassenger- carrying motor vehicles, $87,500 . Connecticut Avenue Bridge over Mingle Valley : For construc- tion of a bridge to replace the Connecticut Avenue Bridge over Klingle Valley, including necessary changes in water mains, and including personal services, engineering, and incidental expenses, $250,000, and the commi ssioners are authorized to enter into co n- tract or contracts for construction of said bridge at a cost not to exceed $500,000 : Provided, That any street railway company using said bridge shall install thereon at its own expense an approved standard underground system and an overhead trolley system of street car propulsion, including trolley poles of approved design, and at its o wn expense sh all thereafte r maintain suc h underground and overhead construction and bear the cost of surfacing, resur- facing, and maintaining in good condition the space between the railway tracks and two feet exterior thereto, and shall defray the cost of excess construction occasioned by such use . For the reconstruction of a viaduct or bridge and approaches thereto to replace the existing viaduct in the line of Monroe Street northeast, over the tracks and right of way of the Baltimore and Ohio Railroad Company, in accordance with plans and profile of said work to be approved,by the Commissioners of the District of Columbia, including purchase or condemnation, under chapter 15 of the Code of Law for the District of Columbia, as amended (45 Stat ., p . 1437), of necessary land, construction of and changes in sewers and water mains, personal services, and engineering and incidental expenses, $135,000 : Provided That one-half of the total cost of constructing the said viaduct or bridge and approaches shall be borne and paid by the said railroad company, its successors and assigns, to the collector of taxes of the District of Columbia, to the credit of the District of Columbia, and the same shall be a valid and subsisting lien against the franchises and property of the said rail- road com any and shall constitute a legal indebtedness of said com- pany in favor of the District of Columbia, and the said lien may be enforced in the name of the District of Columbia by a bill in equity brought by the said commissioners in the Supreme Court of the k
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