The CDM-designed, 24-mgd Walter J. Sullivan water purification facility includes ozone disinfection, dissolved air floatation, granular activated carbon filters, chemical storage and feed systems, and a state-of-the-art, open architecture supervisory control and data acquisition (SCADA) system.
The treatment process provides the best barriers against water-borne bacteria and viruses. It also reduces the potential for disinfection by-products and controls the water chemistry in the distribution system.
Because of vertical and horizontal site restrictions, the new design features innovative dual-use techniques and well-conceived process and interior layouts to minimize the facility footprint. The design stacked, compacted, and in every way possible saved square footage on operations to free up land for the adjacent Fresh Pond Reservation site. The new plant occupies less than half the area of the old facility, freeing that space for public use, and eliminates fencing and allows better views of and access to the Fresh Pond Reservation.
The city and CDM worked with state and local environmental groups as well as with several community groups, including an informal architectural review panel and a planting committee, to ensure that the design of the facilities blended with the existing architecture and the surrounding passive parkland (Fresh Pond Reservoir), and met the needs of all stakeholders.
CDM prepared a hybrid SCADA system design that competitively bid materials and installation, while requiring all necessary software development and integration by CDM's application engineering (AE) team. The AE effort integrated 14 programmable logic controllers, a human machine interface with 120 graphic displays and custom reports, and a plant-wide, redundant Ethernet network. The city and CDM, working collaboratively, configured, tested, and commissioned the new system.
CDM also developed an integrated information master plan (IIMP) that identified implementation tasks related to laboratory information management systems, computerized maintenance management systems, geographic information systems, hydraulic modeling, and SCADA, and builds upon the business value of sharing data among systems.