The Supervisors, pursuant to the procedure in this Article prescribed, are hereby empowered to order the whole or any portion or portions, in either length or width, of any one or more of said public ways to be improved by or have constructed therein, thereover or thereon either singly or in any combination, any of the following work:
(a) The grading or regrading, paving or repaving, planking or replanking, macadamizing or remacadamizing, graveling or regraveling, oiling or re-oiling, piling or repiling, capping or recapping, repairing or reconstruction thereof;
(b) The filling of excavations therein;
(c) The construction or reconstruction of sidewalks, crosswalks, steps, safety zones, platforms, seats, statuary, fountains, parks and parkways, culverts, bridges, curbs, gutters, tunnels, subways or viaducts;
(d) Sanitary sewers or instrumentalities of sanitation, together with the necessary outlets, cesspools, manholes, lamp holes, catch basins, flush tanks, septic tanks, disposal plants, connecting sewers, side sewers, ditches, drains, conduits, tunnels, channels and other appurtenances;
(e) Drains, tunnels, sewers, conduits, culverts and channels for drainage purposes, with necessary outlets, cesspools, manholes, lamp holes, catch basins, flush tanks, septic tanks, disposal plants, connecting sewers, side sewers, ditches, drains, conduits, channels and appurtenances;
(f) Viaducts, conduits, water pipes, water connections and appurtenances and subways;
(g) Poles, posts, wires, pipes, conduits, tunnels, lamps and other suitable or necessary appliances for the purpose of lighting said public ways or other property owned by said City and County;
(h) Pipes, hydrants and appliances for fire protection;
(i) Breakwaters, levees, bulkheads, retaining walls and walls of rock or other material to protect said public ways and other property in said City and County from overflow by water;
(j) Retaining walls, embankments and other structures necessary or suitable in connection with any of the work in this Section mentioned;
(k) The planting of trees, shrubs or any other ornamental vegetation;
(l) The installation of appliances for regulating traffic of pedestrians and vehicles and all other traffic, together with all requisite cables, wires, conduits and all other instrumentalities necessary or proper for the operation of such appliances;
(m) All other work necessary or suitable to improve the whole or any portion of said public ways;
(n) All other work auxiliary to any of the work above mentioned, which may be necessary or convenient for the performance of the same.