Construct chlorination and dechlorination facilities, systems, and equipment for the existing CSO outfalls TI-010 and TI-011. For chlorination at Outfall TI-010, an existing area within the nearby Flushing Bay CSO Retention Facility would be modified and repurposed to accommodate storage of sodium hypochlorite, which would serve as the CSO chlorination/disinfection agent. For dechlorination at Outfall TI-010, a new facility would be constructed consisting of storage for the dechlorination agent sodium bisulfite, and associated flow metering and control equipment. For chlorination and dechlorination at Outfall TI-011, a new combined facility would be constructed, consisting of storage for sodium bisulfite and sodium hypochlorite, and associated flow metering and control equipment. Sodium hypochlorite would be injected downstream of Regulator TI-R09. The following construction activities would be required, but the project is not limited to: • Site demolition and grading. • Construction of new building (piles, concrete foundation slab, concrete walls to above existing grade, concrete masonry unit (CMU) walls above concrete walls with brick veneer and rubber roofing) and concrete chemical fill containment pad. • Installation of sodium bisulfite (for dechlorination) or sodium hypochlorite (for chlorination) fiberglass reinforced plastic (FRP) tanks. • Installation of chemical transfer pumps and metering pumps. • Installation of chemical piping from the chemical storage area to building exterior. • Plumbing, electrical, fire alarm, and remote process monitoring camera systems. • Installation of field instruments and control equipment. • Landscaping and site restoration. • Site drainage. Construction for the underground piping portions of the proposed project would occur within Cityowned rights-of-way, with construction staging areas located immediately adjacent to the project area. For the TI-010 facilities, the construction of underground piping (both for disinfection and dechlorination) would occur within portions of Flushing Meadows Corona Park, which is operated by NYC Parks. Once construction is complete, the piping portions of the project site would be restored to pre-construction conditions, including pavement, curbing, sidewalks, and landscaping, as necessary.
