The forebay wall is in place at Marion's Wastewater Treatment Plant lagoon. Solids will be processed to the northwest side of the concrete wall, right, and liquids in the larger area of the lagoon on the southeast side, according to DPW Director Nathaniel Munafo. A liner made up of over 30 pieces is on site awaiting final surface grading by Methuen Construction and the installation of a Multiflo infrastructural piping system.