New England Water Supply Archives

Managing High Manganese Concentrations in a Drinking Water Reservoir

The Connecticut Water Company’s (CWC) Mackenzie Water Treatment Plant (WTP) provides drinking water to the towns of Clinton, Guilford, Madison, Old Saybrook, and Westbrook in Connecticut. Raw water manganese (Mn) concentrations typically peak during mid-summer (exceeding 2.0 mg/l) when the dissolved oxygen levels create anoxic conditions, resulting in over-bottom manganese concentrations which negatively impact water … Read more

Source Water Protection in a Drinking Water Reservoir using Water Quality Assessments

The Connecticut Water Company’s (CWC) Mackenzie Water Treatment Plant (WTP) draws water from the Kelseytown/Killingworth Reservoir System. Historically, the WTP has had difficulty with raw water manganese (Mn) peaks during summer months. Manganese is released from sediments as an anaerobic respiration byproduct when anoxic conditions occur over the water-sediment interface at depth. Challenge The elevated … Read more

Madison St. Water Main Replacement

Challenge The Wrentham Water Department required the replacement of two existing 12-inch dead end watermains with a new 16-inch loop through Madison Street. The purpose of this project was to increase fire flows and provide redundancy throughout the water distribution system. Despite the critical nature of this watermain loop, the project had never been attempted … Read more

Development and Permitting of Artificial Recharge System – Spruce Hole Aquifer, University of New Hampshire/Town of Durham, NH

Challenge Artificial recharge basins enhance aquifer productivity and protect the environment. A groundwater production well using Artificial Recharge was developed by EGGI in the Spruce Hole Aquifer to meet peak water supply demands of the UNH/Durham Water System during late summer and fall periods. The client desired to increase the productivity of their production well from … Read more

Water Tank Rehabilitation & Appurtenant Work

Challenge The six-million-gallon capacity Oak Hill tank is critical to meeting peak demands and fire flows in the Attleboro water system. When its original coating systems failed, resulting in corrosion and metal loss, and thermal stratification in the tank threatened water quality, GZA provided concept to start-up engineering services to address these issues and maintain … Read more

Route 1 Reinforcing Water Main

Challenge When the Wrentham water distribution system required improvements to provide fire flow to an area targeted for economic development, GZA was asked to design the installation of 5,500 feet of 12-inch reinforcing main. Timing was critical to support a planned development project and to meet the requirements of the State MassWorks Grant, which funded … Read more

Luther’s Reservoir Dam & Pumping Station Rehabilitation

Challenge The Luther’s Reservoir Dam and Pumping Station are critical to the water supply system for the City of Attleboro. When the dam was deemed to be in poor condition and the pumping station found to be in need of modernization, GZA was retained to provide comprehensive dam safety and water supply engineering services to … Read more