Specifications include, but are not limited to: a) Cleaning Tanks and equipment - The contractor is responsible for providing all labor, equipment, material, and supervision to remove all the debris from the tanks and properly dispose of by hauling debris to a Class 1 Landfill. The Contractor is responsible for all costs associated with the removal and disposal of debris. The debris will include vegetation, grit, rags, dirt, etc. The overall tank size is 235 feet long by 60 feet in width. The post-anoxic section of the tank, which is part of the overall tank, is 60.0’ long by 60 feet in width. The Post Aeration section, which is part of the overall tank is 17.0’ long by 60.0’ in width. The tank is 17 feet deep at the wall and 19 feet deep at the center of the tank. All piping and pipe connections must be cleaned and free of foreign materials. All aeration discs and connectors must be cleaned and free of foreign materials. b) Tank Inspection – All equipment must be inspected for damage and condition. This includes, but is not limited to the following: piping, pipe connections, supports, and diffuser connections. The inspection shall also include inspecting the coatings on both tank areas to establish the current coating condition. Coating the basin is not part of the scope of this project. The contractor shall provide a report to the City outlining all the findings once the inspections are complete. c) Rehab of Aeration System - All diffusers will be replaced with new diffusers. There are approximately 1,530 diffusers in the tank. The City will require the purchase of 1,750 diffusers as part of the project. All diffusers not used will be turned over to the City as spares. All damaged diffuser connection adapters, flange gaskets, damaged pipe connections and Fernco couplings shall be replaced. Any piping that is damaged or showing signs of excess wear will be replaced with equivalent or superior piping as determined by the City. The contractor shall provide a cost for time and materials to cover the above unknown conditions for each item. For example, cost of time and material for each coupling to be replaced. Refer to appendix A for drawings of the project and Appendix B for installation specifications. d) Contractor shall inspect link seal on IMLR pipe to see if it needs to be replaced or just tightened up. Since this requires stucco and/or grout removal, the contractor is responsible for removing the stucco and/or grout to expose the bolts and link seal. After repairs and/or tightening has been made, the contractor will install grout or stucco as needed after the area has been tested to ensure there are no leaks. The contractor will be responsible for providing and installing all materials to provide a leak tight seal between the pipe and the basin. Materials include but are not limited to link seal, bolts, grout, stucco, paint, etc…Paint is to match existing coating. Contractors are to enter cost for link seal time and material costs in the Aeration Basin #3 Parts List for time and material costs.
