Where there is any unauthorized accumulation of lumber, junk, garbage, trash, debris, or salvage materials over and above the required receptacles or other approved containers, or otherwise in violation of this code and which are visible from public or private property when the observer is standing in a normal or customary place from which to observe the alleged nuisance or which is found when observed during an inspection pursuant to a warrant. "Junk" as used herein consists of any cast-off, damaged, discarded, junked, obsolete, salvaged, scrapped, stored, unusable, worn-out, or wrecked object, thing or material composed in whole or in part of asphalt, brick, carbon, cement, plastic or other synthetic substance, fiberglass, metal, paper, piles of earth, plaster, plaster of Paris, rubber, terra cotta, wool, cotton, cloth, canvas, organic matter or other substance.