Digester Cleaning Services for the RSD Wastewater Treatment Plant

The Project work involves extraction and removal of all liquid and solid substances (dregs) from the plant`s digesters. The digesters will be cleaned one at a time to allow for uninterrupted service at the treatment plant. The digesters were last cleaned in 2018. The material that has settled in the bottom of the digester since that time will likely be hardened and in the form of large, dense clumps. The digesters are currently in operation; therefore, the amount of dregs that will remain after draining is unknown at this time. The volume is estimated at 50,000 to 100,000 gallons in each digester. The contractor shall remove the dregs from the digesters and dewater this material onsite using mobile tanks and/or equipment supplied by the contractor. RSD staff will provide direction for how to transfer the decanted liquid to the RSD headworks. The contractor shall pressure wash the interior of the digesters once all dregs have been removed. At the conclusion of the project, the digesters shall be clear of visible debris and empty of all liquid. Dewatered solids shall be hauled offsite by the District. The contractor shall deposit the dewatered solids in one of the District`s unused drying beds. The contractor will be compensated a lump sum for preparation, mobilization, pressure washing, and demobilization upon satisfactory completion of the work, regardless of the volume of dregs.

Sewage Treatment Plant, Renovation.

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 03 -	Concrete, Precast Concrete.
Division 04 -	Masonry, Unit Masonry.
Division 05 -	Metals, Structural Metal Framing, Metal Fabrications.
Division 06 -	Wood, Plastics, and Composites, Rough Carpentry.
Division 07 -	Thermal and Moisture Protection, Dampproofing and Waterproofing, Thermal Protection.
Division 08 -	Openings, Doors and Frames, Windows, Hardware.
Division 09 -	Finishes, Painting and Coating.
Division 10 -	Specialties, Signage, Compartments and Cubicles, Emergency Aid Specialties, Fire Protection Specialties, Storage Assemblies.
Division 11 -	Equipment, Laboratory Equipment.
Division 14 -	Conveying Equipment.
Division 21 -	Fire Suppression, Fire-Extinguishing Systems.
Division 22 -	Plumbing, Instrumentation and Control for Plumbing, Plumbing Piping, Plumbing Equipment, Plumbing Fixtures.
Division 23 -	Heating, Ventilating, and Air Conditioning (HVAC), Instrumentation and Control for HVAC, HVAC Air Distribution.
Division 26 -	Electrical, Instrumentation and Control for Electrical Systems, Interior Lighting, Emergency Lighting, Exit Signs, Exterior Lighting.
Division 27 -	Communications, Structured Cabling, Data Communications, Voice Communications, Distributed Audio-Video Communications Systems.
Division 28 -	Electronic Safety and Security, Electronic Access Control and Intrusion Detection, Access Control, Intrusion Detection, Electronic Surveillance, Electronic Detection and Alarm.
Division 31 -	Earthwork, Earthwork Methods.
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Division 33 -	Utilities, Water Utilities, Storm Drainage Utilities, Electrical Utilities, Communications Utilities.
Division 44 -	Pollution and Waste Control Equipment, Common Work Results for Pollution and Waste Control Equipment, Air Pollution Control, Noise Pollution Control, Odor Control, Water Pollution Control Equipment, Solid Waste Control and Reuse, Waste Thermal Processing Equipment, Fluidized Bed Combustion Equipment, Rotary Kiln Incinerators, Pyrolysis Equipment, Hazardous Waste and Medical Waste Incinerators, Heat Recovery Equipment for Waste Thermal Processing, Synthesis Gas Cleanup and Handling Equipment.