A wall-mounted storage rack assembly facilitates storage of articles such as bicycles, lawn care implements, tools, and the like by providing a pair of independently pivotally movable support arms, which are pivotally supported on an associated mounting bracket. A heap may be divided into a number of heap blocks. The apparatus features improved resistance to pollutant remobilization through treatment of water volume rather than flow rates, using vertically stacked water columns of varying depths to settle small particles. The current locality information is provided in a uniform manner outside of the signaling protocol.