Site work for a water / sewer project in Ithaca, New York. Completed plans call for site work for a water / sewer project.

The City of Ithaca is requesting proposals from qualified firms or individuals to furnish a dedicated Fats, Oils, and Grease (FOG) heating, mixing, and pumping system as a new, independent feed line into the digester at the Ithaca Area Waste Water Treatment Facility. All questions and communications should be in writing and sent via e-mail. Questions and requests for clarifications related to definition or interpretation of this RFP shall be submitted via email to bzarzynski@cityofithaca.org no later than 5:00 PM on 01/01/26. The Contract award, if any, will be made by 02/01/26. pn- 12-001, 8614051, 12-002, 12-003 The City of Ithaca, Ithaca, New York (hereinafter referred to as "City") is soliciting sealed written proposals from qualified equipment suppliers to furnish a dedicated Fats, Oils, and Grease (FOG) heating, mixing, and pumping system as a new, independent feed line into the digester. The project aims to improve handling efficiency and optimize digester operation by adding a heating line/loop to maintain proper temperature conditions for fats, oils and grease Scope of Work and Deliverables The system shall be designed and installed in a way that allows for potential future integration of septage and thickened sludge heating if desired, without requiring major rework. A. Tank Configuration - Provide 2 design options for tank configuration - Option 1 - Keep FOG service at Tank #1 - Option 2 - Repurpose Septage Receiving Tank #3 for FOG service and relocate glycol storage to Tank #2. Note a new bar screen will need to be added for FOG delivery. - Ensure all tanks are finished with corner edge grouting and radius as planned. B. Heating System - Install stainless steel (or equivalent corrosion-resistant) multi-pipe heating loops, estimated 4-8" diameter (final sizing to be based on heat transfer performance requirements), mounted around the interior walls of Tank #3. - Provide direct hot water supply from the existing plant hot water system (HWS), sourced from the turbine building and existing boiler/turbine loop. - Minimize additional heat exchangers or glycol loops unless technically required. Direct HWS tie-in is the preferred approach; additional heat exchangers or glycol loops shall only be used if technically unavoidable, as they add unnecessary complexity and efficiency loss. C. Mixing & Suspension - Utilize the existing in-tank grinder/mixer pump where possible. o Replace the 2 existing Vaughan submersible chopper pumps that are currently out of service - If mixing performance is inadequate, provide additional mixers to maintain proper suspension and consistent heat transfer. D. FOG Pumping - Furnish and install a new diaphragm pump (or equivalent) suitable for FOG service. - Pump must be sized to handle expected flow rates and viscosity. -Existing Wemco septage pumps shall not be used for FOG transfer E. Piping & Distribution - Install new insulated underground piping from the turbine building to the digester building. -Route piping to avoid conflicts with existing infrastructure, including the concrete pad for the gas compression skid. - Evaluate cost-saving options such as reusing existing insulated PEX piping currently stored onsite. - Heat tracing is not preferred due to maintenance concerns; provide adequate insulation instead F. Digester Tie-In - Connect heated FOG line into the digester sludge circulation line immediately upstream of circulation pumps. - FOG heating shall be a dedicated process line, isolated from septage and thickened sludge feeds. - Include a static mixer (e.g., KOMAX or approved equivalent) to ensure thorough blending with preheated sludge. - Confirm compatibility with existing spiral heat exchangers for additional heat pickup. G. Proportional Injection Capability -Integrate provisions for proportional injection of glycol into the FOG stream at controlled ratios. - Control system should allow operators to adjust dosing rates to optimize digestion performance and support stable methane production. H. Design Assumptions - FOG composition varies too much to provide any data, use vegetable oil to design - Errors on IAWWTF Septage Receiving2 dwgs package o All shown piping & construction needs to be field verified As no As Builts or Redlined Markups appear to be in files. o Some Septage Bldg Overall inside piping to Tanks & Honey Monsters has been modified and does not match supplied drawings now. - Sheet M-2 o Septage Transfer Pumps location shown in the tanks not correct to Dwgs o STPs are more centrally located in tank, next to 8" Fill piping shown - Sheet M-4 o Scum Pit New Construction shows new Grinder Pump piped to Thickener,Was never piped to Thickener, Was Connected to existing Parallel Septage Piping directly to Primary Digester. - Sheet E-2 o Level Floats shown as STP controls were never installed o STPs ended up use Radar Level Sensor Controllers mounted in 4-6' Holes not shown o Electrical Panel Dwgs & EC Dwgs for STPs were never marked up or corrected. o To use Radars as level controls. No Docs found in Dwg or Wiring Wise for Panels Or Field showing those Radars or Interface Meters. I. Deliverables The contractor shall provide the following: 1. Provide full professionally stamped design drawings. 2. Furnish all equipment, materials, and piping required for the installation. 3. Perform all necessary demolition, site preparation, and trenching. 4. Install and test pumps, mixers, heating loops, and control systems. 5. Integrate the system with existing plant HWS and digester piping. 6. Commission the system, including performance testing of heating, pumping, mixing, and injection functions, with demonstration of target heat transfer and mixing sufficient for stable digester gas production. 7. Provide operator training and as-built documentation