We are continuously working to maintain and improve the water system. Some of the major projects we are currently working on involve the installation of new, or the replacement of existing, equipment and facilities needed to provide safe, reliable water service.
Aquarion provides water to customers in three separate water systems in Dover:
Aquarion acquired these water systems on December 1, 2021. The following is a summary of the work performed to date to improve water quality and system reliability.
Aquarion reviewed the Supervisory Control and Data Acquisition (SCADA) systems at the five wellfields, and has replaced some of the water quality instrumentation, added communications hardware, and revised control programs to improve the consistency of water treatment and improve remote monitoring of system conditions. This work will continue for several months to bring the SCADA systems up to Aquarion’s corporate standards and to enhance the remote monitoring and control functionality.
The Knollwood Wellfield (2 wells) and its treatment facility provide water to downtown Dover and the surrounding neighborhoods. The water from the Knollwood wells is better quality than the water from the Francis and Draper wells with respect to both iron and manganese concentrations, which cause discoloration of the water. The Knollwood wellfield also has more capacity than is currently being used. Aquarion has begun a project that will allow for increased use of water from the Knollwood wellfield, and thus allow for decreased use of water from Francis and Draper wellfields. The project for Knollwood wellfield includes:
As of December 31, 2021, the Company determined the capacity of the Knollwood wells based on a recent multi-day pump test, developed a conceptual design for the upgraded Knollwood facility, evaluated the distribution system to identify the best location for the aforementioned valves and pumps (i.e. Picardy Lane facility), developed a conceptual design for the upgrades at the Picardy Lane facility, and identified necessary distribution system piping upgrades.
Francis Wellfield (3 wells) is the largest producing wellfield in the Dover Main system. The water from these wells contains relatively high levels of manganese and iron, which cause discoloration of the water. Aquarion has begun a project that will include filters to remove the iron and manganese from the water.
As of December 31, 2021, the Company evaluated two treatment scenarios (one with and one without an on- site water storage tank), evaluated site limitations (e.g. wetlands, zoning, and grading), determined permitting requirements, and evaluated various locations for siting a new building to house the new treatment facility.
Aquarion’s consulting engineer, Tata & Howard, plans to complete a report summarizing this work by January 28, 2022. The report will include a schedule for the project.
There is no water storage tank in the Dover Main system other than small, pressurized tanks at each wellfield. The lack of storage can make it difficult to satisfy peak hour demands during summer months. The lack of storage also limits the ability to properly clean/flush the water mains to remove fine sediments of iron and manganese that can accumulate in the water mains and cause discoloration. Aquarion is evaluating the construction of a water storage tank in the system.
As of December 31, 2021, the Company has evaluated two sites for the water storage tank: the Francis Wellfield and the Picardy Lane facility site.
Aquarion’s consulting engineer, Tata & Howard, plans to complete a report summarizing this evaluation by January 28, 2022.
The distribution piping for the Dover Main system is in close proximity to the distribution system piping for the water systems in both Walpole and Medfield. Aquarion sent letters to public officials in both Walpole and Medfield requesting an exploration of temporary interconnections with their water systems. An interconnection would allow Aquarion to purchase water on a temporary basis, until the projects described above can be implemented. Aquarion plans to follow-up with these public officials in early January to further the discussion on this topic.