Abstract: A settling tank for clarifying washing fluids with one or more walls disposed within the tank, each wall having a plurality of passages and defining a settling chamber. Preferably there is a top mounted fluid runoff opening into the tank disposed above the innermost settling chamber and at least one pump inlet disposed in an upper part of the tank outside the outermost settling chamber. Passages in the inner wall are in a lower region of the wall, and the passages in the second wall are in an upper region of the wall, and at least some of the passages are hooded to enhance a flow velocity change for fluid passing through the passages. There is optionally a sump pump having a one way valve for discharging sump sediment from the sump into a portable waste can. There is also preferably a sump tube generally curved upwardly and away from a bottom of the sump, and to which the pump is connected.

Abstract: A system for mounting access plates for covering an access opening onto storage tanks and the like. A backing plate assembly comprising two semi-circular, rigid backing plates is provided. The backing plates are passed individually into the interior of the tank where the backing plate assembly is reconfigured. The backing plate assembly located within the interior of the tank provides a solid structure that can be used to anchor the access plate onto the tank wall over the opening. Interior and exterior gaskets are used to create a fluidtight seal around the opening and to facilitate assembly of the mounting assembly.