2. Works of the kinds hereinafter described constitute the field of practice of an engineer:a) railways, public roads, airports, bridges, viaducts, tunnels and the installations connected with a transport system the cost of which exceeds $3,000;
b) dams, canals, harbours, lighthouses and all works relating to the improvement, control or utilization of waters;
c) works of an electrical, mechanical, hydraulic, aeronautical, electronic, thermic, nuclear, metallurgical, geological or mining character and those intended for the utilization of the processes of applied chemistry or physics;
d) waterworks, sewer, filtration, purification works to dispose of refuse and other works in the field of municipal engineering the cost of which exceeds $1,000;
e) the foundations, framework and electrical and mechanical systems of buildings the cost of which exceeds $100,000 and of public buildings within the meaning of the Public Buildings Safety Act (chapter S-3); f) structures accessory to engineering works and intended to house them;
g) temporary framework and other temporary works used during the carrying out of works of civil engineering;
h) soil engineering necessary to elaborate engineering works;
i) industrial work or equipment involving public or employee safety.