Specifications include, but are not limited to: The drains to be cleaned in this project include median barrier wall box inlets, drop box inlets, catch basins, bridge end drainage box inlets, curb box inlets, etc., that have removable grates. All of these are usually larger and deeper drains, some of which are trapped. Drains that have two grates serving the same collection box are to be counted as one drain. The Contractor shall remove (and replace) the grate for access and vacuum the throat and chamber area to remove all sediment, drift, and other debris and wash out the catch basin to verify adequate drainage as determined by the Engineer. The contractor shall provide any water required for the cleaning process. Lateral/longitudinal drains of a trench design shall be cleaned using water flushing and suction of debris for the length of the drain. This project will require that wall scupper drains are cleaned. The wall scupper drains are slots under barrier rails and through bridge parapet walls. The contractor shall remove all sediment, drift, and other debris from the slots.
