When located within the street right-of-way, sidewalks shall be located as shown in Appendix B. All materials and methods used in the construction of sidewalks shall be in conformance with the Rhode Island Standard Specifications for Road and Bridge Construction. Sidewalks shall be constructed of a four (4) inch thickness of Portland Cement pavement to a minimum width of four (4) feet and shall be set on a minimum sub base of eight (8) inches compacted bank run gravel and a base of four (4) inches of processed gravel.