Specifications include, but are not limited to: The intent of drain line and drainage structure cleaning is to remove foreign materials from the lines/structures and restore the drain to a minimum of 95 percent of the original carrying capacity. It is recognized that there are some conditions such as broken pipe and major blockages that prevent cleaning from being accomplished or where additional damage would result if cleaning were attempted or continued. Should such conditions be encountered, the Contractor will not be required to clean those specific sections. A daily log shall be maintained to record the location of the manholes, catch basins, and drain lines cleaned; lengths of the lines cleaned; method of cleaning; line sizes; and volume and type of debris removed. The equipment, which is expected to be used for the cleaning work on this project, is a high velocity combination sewer cleaner and vacuum truck supplying water at a minimum of 80 gpm at a minimum of 2000 psi. If the cleaning of an entire section cannot be successfully performed from one manhole, the equipment shall be re-setup on the other manhole and cleaning attempted again. IF successful cleaning cannot then be performed, it will be assumed that a major blockage exists and the cleaning efforts hall be abandoned until an excavation and point repair can be made by City supplied forces and the cleaning operation can be resumed. The Contractor shall then be paid for the initial cleaning attempt. After removal of the blockage the contractor will again clean the line section. The Contractor shall then be paid for the second cleaning at the same rate as the initial cleaning. All sludge, dirt, sand, grease, rocks, and other solid or semi-solid materials resulting from the cleaning operation shall be removed from the downstream manhole of the section being cleaned.
