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'2.1.~ (b) Liquid waste containing human exereta, and other matter, flowing in or from a building-deainage system or SeTtler. Exerta include feces, urine, secretions from the skin, expectoration, etc. (c) Liauid wastes from dwellings and institutions, stables, and business buildings. It may also contain liquid wastes from in- dustries. (d) A combination of (a) the liquid wastes conducted away from resi- dences, business buildings and institutions, and (b) from in- dustrial establishments, with (c) such ground surfacr, and storm water as may be admitted to or find its way into the sewers. (e) The ordinary liquid contents of a sewer containing organic wastes, which mayor may not include street wash. 2-71 SHALL as used in this code is mandatory. _ 2-72 SOIL PIPE is any pipe which conveys the discharge of water-closets, with or without the discharges from other fixtures, to the building drain. 2-73 STACK is a general term for any vertical line of soil, waste or vent piping. 2-74 ST"41RWAY means one or more flights of stairs and the necessary ~andings and platforn~ connecting them to form a continuous and uninterrupted passage from one story to another building or structure. 2-'15 STORY means that part of a buldding comprised. between a floor and the floor or roof next above. (NOTE: See definition of Ilheighttl.) 2-76 STREET means any public thoroughfare, street, avenue, boulevard, park, land, terrace, concourse or space thirty feet or more in width which has been dedicated or deeded to the pu~lic for public use. 2-77 STREET LINE means a lot line dividing a lot from a: street. (NOTE: compare Hith definition of "buHding line" and ""lot line".) 2-73 STRUCTURE means a combination of materials to form a construction that is safe and stable; including among others, stadJimms, gospel and circus tents, reviewing stands, platforms, stagings, ovservation towers, radio towers, water tanks and towers, trest~es, piers, wharves, sheds, coal bins, fances and display signs; the term lIstructure" shall be construed as though followed by the words "or part thereof". (NOTE: The dis- tinction bett-leen "structure" and "building" should be noted. II Structure is the bnoader term; "Building" is a restricted form of "structure'1.) 2-79 ~RAP is a fitting or device so constructed as to prevent the passage of air or gas through a pipe without materially affecting the now of sewage or waste water through it. 2-80 TRAP SEAL is the vertical distance between the crown weir and the dip of the trap. 2-81 VENT PIPE is any pipe provided to ventilate a buklding-drainage system and to prevent trap siphonage and back pressure. 2-82 WALL (a) Bearing wall means a wall which supports any vertical .lead in -12-