Several clarifier basins have I-beams spanning the basins. These beams support the clarifier equipment in the basin as well as a walkway. Where the beams attach to the concrete walls, the supports need to be replaced. The beams need to be temporarily supported in order to replace the permanent supports. This includes some modification to the concrete walk on top of the concrete wall and some modifications to aluminum handrail and floor plates. Process chemical piping will need to be supported and or modified.