Site work, paving, outdoor lighting, new construction and renovation of a mixed-use development in Mankato, Minnesota. Completed plans call for outdoor lighting for a road / highway; for site work for a road / highway; for paving for a road / highway; sidewalk / parking lot; sidewalk / parking lot; and water / sewer project.

The proposed Work is generally described as follows: 1. Sitework a. Install a 30" pipe from the existing Grit Building to the Equalization Basins. b. Extend 36" secondary clarifier effluent pipe to new disinfection basin influent. c. Install 48" pipe between the new disinfection basin effluent and connect to outfall piping. d. Extend 12" MEC return line to new disinfection basin. e. Install 24" pipe between the existing Equalization Basins and new disinfection basin. f. Provide a second bay for septage receiving. Add new reclaim water loadout station, flow metering, and sand trap structures. g. Addition of standby generator. h. Provide roads, sidewalks, site drainage, and utilities for new facilities. i. Improve site lighting. 2. Preliminary Treatment a. Install two (2) mechanical bar screens with 1/4 " openings. b. Provide two screening washer/compactor systems, one for each screen. c. Replace six (6) sluice gates with new motorized actuators in the Influent Pump Station Building. 3. Disinfection a. Demolish and remove existing chlorination basin, dechlorination basin, and Mankato Energy Center (MEC) return building. b. Construct new chlorination basin and dechlorination basins. c. Construct new chemical feed building adjacent to chlorination basin. Building will house sodium bisulfite bulk storage and all sodium hypochlorite and sodium bisulfite metering pumps. MEC return and effluent analyzers will also be located in the chemical feed building. 4. Digestion Complex a. Replace existing two primary digesters and one secondary with three new anaerobic digesters b. Retrofit existing Digester No. 3 to operate as a digested sludge storage tank (i.e. press feed tank). c. Add Digester Control Building to include pumps, heat exchangers, rotary drum thickeners, polymer system, boilers, digester gas equipment, HVAC, and electrical equipment. Invitation to Bid City of Mankato 00020 - 2 B&V Project No. 403640 Mankato, MN Issued for Bid Mankato Disinfection & Digestion Improvements 3/7/2024 d. Provide new pad mounted biogas storage. 5. Solids Processing Building a. Provide mixing pumps for the Sludge Storage Tank. b. Replace hot water boilers and HVAC equipment. c. Replace sodium hypochlorite transfer pumps and metering pumps. 6. Biosolids Storage Facility a. Construct biosolids storage facility, and make modifications to existing biosolids storage facility. 7. Operations Building a. Demolish existing DAF thickening system. b. Add space and renovate existing building to provide space for laboratory and facility operations. 8. Miscellaneous a. Renovations to the Sludge Transfer Pumping Station. b. Removal and addition of piping in tunnels. c. Renovations to the Water Reclamation Facility. All questions regarding the project shall be directed to the Office of City Engineer, Michael McCarty, (507) 387-8643, mmccarty@mankatomn.gov.