Hillview Reservoir plays a critical role in the New York City Water Supply System. The 900-million gallon reservoir balances the incoming flows of the Catskill and Delaware Aqueducts with the NYC water distribution demands by providing storage while simultaneously maintaining a water surface elevation that provides adequate pressure throughout the system. Additionally, Hillview Reservoir is the last location where chemical treatment is provided upstream of the NYC distribution system, providing secondary treatment for 90% to 100% of NYC’s water supply, as well as approximately 50% of the City of Yonkers’ water supply.
The project scope involved new chemical feed systems and structures, dosing and flow measurement improvements, electrical upgrades, and site access upgrades. As a subconsultant, SI Engineering, P.C. (SIE) provided constructability and biddability reviews for the Hillview Reservoir Chemical Addition Facilities Project. These reviews paralleled design and occurred at each milestone of the design and preconstruction phases of the project.
The new facilities and improvements designed and constructed under this project will replace aging infrastructure, improve operational flow control and chemical systems, and increase the facility’s redundancy and reliability into the next century. The project was comprised of two (2) new chemical addition facilities (CAF) buildings, housing new chemical systems that will replace existing chemical systems, and providing an operations control center; two (2) new medium voltage electrical service entrances and associated power distribution systems for CAF-North, CAF-South, and the upgraded uptake and downtake structures; upgrade of the north entrance; new flow measurement systems to measure incoming flow from the Catskill and Delaware Aqueducts and flow in the North Connecting Conduit; new Supervisory Control and Data Acquisition (SCADA) system; and new interim structures for chemical systems, water quality monitoring systems, and carry water pumps.
SIE provided constructability and biddability reviews of the civil and site elements of the project designs. This included conducting an evaluation of the project plans and specifications and offering suggestions to improve contractor efficiency and understandings of the design, including construction sequencing, with the goal of enhancing constructability and biddability of the contract documents.
