Specifications include, but are not limited to: The drains to be cleaned in this project include median barrier wall box inlets, dropbox 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 with two grates serving the same collection box are counted as one drain. The Contractor shall remove (and replace) the grate for access, 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. The Contractor shall inspect for any drain-related pipe malfunction by injecting sufficient water into the drain to verify adequate pipe drainage during the drain cleaning operation. All non-functioning drainage pipes detected during the drain cleaning operation above shall be cleaned at the same time as drain cleaning using Item Nos. 611-07.13 and 611-07.14. Pipe cleaning shall be limited to only the pipes connected to each drain's drainage system. The Contractor shall provide appropriate equipment that will cause no damage to the pipe while clearing/snaking the pipe. Should the Contractor be unable to correct the drainage pipe problem, he will be paid for the portion of pipe cleaned.
