Specifications include, but are not limited to: B.1 The District of Columbia Office of Contracting and Procurement, on behalf of Department of Public Works requires the services of a Contractor to perform snow and ice removal to ensure that the roadways are passable as specified herein. The source of the roadway coverage is the National Highway System (NHS) within the District of Columbia as shown in Attachment J.9. B.1.1 The Contractor shall provide all supervision, personnel, equipment, materials, tools, supplies and all incidentals required to remove ice and snow from District streets designated under the National Highway System. The District will provide de-icing sodium chloride rock salt and brine for pre-treating.